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Fluke 5725A User's Manual

Contents

1. 8 7 6 5 4 3 2 I 1 TP6 1 OUT PG1D2 684 TP6 2 LFAMP PG1C3 TP603 HVIN PG1C6 6 2 R601 C61 TP601 TP604 5VKS PG1B7 1K luF MV OUT 605 15V PG1B7 16 4 6 15 PG1B7 TP6 7 VLFPD PG1B6 TP608 LFPD PG1B6 609 MFPD 1867 D TO SIGNRL 15V DORMANT TP61 HFPD PG1B5 TRRNSF ORMER phere 8603 1 2 STBY TP611 4 V IM 187 assy 4 7K 1 5p 4 7 Sp 1 2V PER TP612 PG1B7 TP613 KCOM PG186 6686 b TP614 CLRMPD 186 RegS 2086 1 TP615 CLAMPS PG1A5 44 2K 1 TP616 HVTEMP M 1 7 C607 8682 k A OPERATE GV 409 s 22pF Wes FRONT 0602 0603 0645 r1 CR603 0606 0658 0659 TP682 B 0660 8 1uF M 1N4448 ey IM 15V 5 0621 715V DORMANT 408V PGIR7 R611 B ACV STBY Reb FRONT 0691 6V OPERRTE 15 4 D 6 SEE 2 R613 POWER R616 R617 R618 SUPPLY KEY pure 4 7K 51 0642 BOTTOM C SCHEMATIC E683 51 24
2. 8 7 6 5 4 3 5 1 1228V DORMANT STBY amp OPER 52V AC 6302 47BK 470K 1 FUSE CLIPS 1 305 TP302 BV DORMANT 301 302 0301 0302 450V RCV STBY amp OPER F301 2 50 TRANSFORMER 5 4BBV OPERATION VR301 ps D 33 15V 249K 1 965 5 CR305 NOTES be R318 CR314 1 5M 1NABAR 1 ALL RESISTORS IN OHMS AND ALL CAPACITORS 10 TRANSFORMER 8 470 1N4448 IN MICROFRRRDS UNLESS OTHERWISE NOTED Sgv OPERATION 2 LAST REF DES USED ON SHEET 1 C322 CR325 IN4994 E302 2303 328 P3B1 0324 R354 CR322 54302 TP387 0302 AND VR3Q7 R362 REF DES NOT USED ON SHEET 1 R312 R353 C315 4 7 0303 C316 301 304 MP309 MP316 R317 MPSR42 R330 R331 0315 5842 R311 4 1302 PINS 2 3 5 6 AND ARE PULLED R313 1 5M 3952 0321 S VOLTAGES IN BOXES ARE TYPICAL MPSA 42 2480 IMON 1 0322 6283 MPSR42 oy 4 MON 5V 5V 0305 5V DORMANT MPSA 42 STBY 05 d Qv OPER pon 0394 HVSUPPLYx DCOM 552 5842 5 R326 CR315 1uF 18 0 1440048 54382 0327 R309 is SET DCOM R318 246528 6 8K POSITION 86 6K 2 3 MANUAL CONTROL 1 2 SYSTEM CONTROL 1uF 246528 4 N C 5V R325 A 18K ete 1P387 con M
3. J aq62f eps TYPICAL COMMUNICATIONS ACTIVITY AT PINS 12 AND 13 OF U507 5725A 1650 aq43f eps Figure 9 5 A5 Digital PCA 9 16 ECLK STROBE 2 6 5 Schematic Diagrams 2 _ 1 5V0 NOTES INPUT POWER FILTER resa VOLTAGE MODE CURRENT MODE 57258 STANDBY FAULT OVERLOAD CABLE OFF d T CHEDS 4 STROBE 1 5 CONTROLS HV SENSE 45V 2 5vD BYPASS CAPACITORS x STROBE 21 22 CONTROLS CURRENT Du lade 1 al 3 x C581 3L 502 C528 C523 C584 5 5 5 6 C5g7 508 Csg9 510 C511 C518 C519 C521 2 5 1 gt CRSD2 2 5 6 cRsg DIGITAL TESTS TPS06 TPS08 1uF 22uF 224 tuF g 1uF g 1uF uF 1uF g 1uF 8 luF g 1uF 8 1uF 8 1uF
4. 4 14 Detailed Circuit Description 4 15 Interconnect Assembly 4 16 Power Supply Assembly A4 sese 4 17 High Voltage Supply Section pp 4 18 Switching 4 19 Curtent Limit Section uice deese eese eno reed 4 20 System Supply Section 4 21 Fan Supply Section ect er 4 22 Digital Assembly A5 4 4 23 ee epe eder 4 24 External RAM ois Su saa fth 4 25 External ROM 4 26 EE 4 27 Data aa aiii 4 28 Strobe LEWES u u uu bays 4 29 Led Driver teet 4 30 Optoisolator 4 31 Break Detect 4 0 4 32 Power Up and Reset 4 33 Watchdog TIMET 4 34 Current Amplifier Assembly A2 a 4 35 Error Amplifier 4 36 Output Stage Section 4 37 Monitor etie ere eee 4 38 Control and Switching Section 4 39 Power Supply
5. 3 of 8 aq26f tif Figure 8 1 Final Assembly cont 8 8 List of Replaceable Parts 8 E Ox JE WAYS WAC 5 SX 5725A T amp 4 of 8 aq27t tif Figure 8 1 Final Assembly cont Instruction Manual 5725A 5 1SSdW emay MOLIZNNOD Qa 04112448409 bmav g bOCHTN 24 0 4 9 ep Yee 39 39 39V_110A HTH m Sv d SIBdNSN SAT aq28f tif 5725A T amp B 5 of 8 Figure 8 1 Final Assembly cont 8 10 List of Replaceable Parts 8 N CHANNEL wi 5 az m a gt CHANNEL gt Cw 3 INSTRUMENT FRONT 5 TO HIGH VOLTAGE AMP PCA 3 N E 29 Figure 8 1 Final Assembly cont 8 11 5725A Instruction Manual amp 5725AT amp B 7 of 8 Figure 8 1 Final Assembly cont List of Replaceable Parts 8 id Qa r 5725 amp 8 of 8 aqg1f tif Figure 8 1 Final Assembly cont 8 13 5725A Instruction Manual 8 14 Table 8 2 A1 Interconnect PCA Reference De
6. Ee Epi eb ripe A5 Digital PCA High Voltage Sense PCA 12 Transformer Enclosure Assembly eere A30 Inductor une ime pi eie Erbe 5725A Instruction Manual Figure 2 1 2 2 2 3 3 1 3 2 4 1 4 2 4 3 4 4 6 1 6 2 6 3 6 4 6 5 6 6 8 1 8 2 8 3 8 5 8 6 8 8 8 9 9 7 List of Figures Title Line Power Cords Available for Fluke Instruments Correct Way to Dress Interface Cable Line Power Label and Switch Location eene ACCESSING the FUSE L Front Panel Features uenti ret eher Rear Panel eamireS 5725 Overall Block Digital Assembly Block Diagrana nasisa 14 17 Current Amplifier Assembly Block High Voltage Amplifier Assembly Block Diagram High Voltage Sense Assembly Block Accessing the FUSE Accessing the Aur Filter uiuit perpe ai Assembly Location Diagram n rennen nennen Initial Access Procedure ice Le ebrii Accessing the Digital Assembly pe Correct Way to Dress 2 0 0 00 eerte 6 12 Enabling Front o
7. Where Error is in mQ for all TWO WIRE COMP values and FOUR WIRE SHORT and in ppm for the remaining FOUR WIRE values K is the constant from the above table l and are expressed in mA for SHORT to 1 9 are expressed in pA for 10 to 100 MQ 2 For lt I lt l errors occur due to self heating of the resistors in the 5700A Use the following equation to determine the error in ppm and add this error to the corresponding UNCERTAINTY or STABILITY specification Error in ppm K l 1 Where K is the constant from the above table are expressed in mA for SHORT to 19 are expressed in pA for 100 to 100 MQ Introduction and Specifications 1 Specifications DC Current Absolute Uncertainty from calibration temperature callbrado Relative Uncertainty 1 Rande Resolution For fields strengths gt 1 V m but lt 3 V m add 1 of 9 24 Hours 90 Days 180 Days 24 Hours nA ppm output nA ppm output nA 220 45 10 50 10 55 10 60 10 24 2 26 2 2 2 1 45 10 50 10 55 10 60 10 24 5 26 5 22 10 45 100 50 100 55 100 60 100 24 50 26 50 uA t ppm output LA ppm output uA 220 mA 1 55 1 60 1 65 1 70 1 26 3 30 3 2 2A 1 75 30 80 30 90 30 95 30 40 7 45 7 Note 1 5725A Amplifier 11 10 330 470 340 4
8. T i by MUXOUT 5 B10 0156 1 TO DIGITAL 25124 4i COMPARATOR reis VIR INTERCONNECT u vcon Yy MONCOMP 288 B R178 4 619 1 121516 im C167 RIIT RIGS N3904 5 06 07 08 01 020304 20 VCOM 2142 0155 VDD 1uF 18 2K 2 74HCT373 GND 1a 15 lt gt 15 1617 18 11 121314 8 1uF 15 DC M 1718 7 lt gt 2 03 067 vcoM x eg PET C uha a m ANALOG MONITOR CIRCUIT 7C 1 5 198 5V INTERCONNECT SENSOR SHIELD DIGITAL OUT GUARD SHIELD DEN VCDM VECOM 5725A 1001 2 of 4 8 7 12 Figure 9 6 High Voltage Sense PCA cont 9 20 STROBE 1 CR151 1N4448 INTERCONNECT 32 COMMUNICRTION TO FROM 57008 38E DATA BUS 2 7 5 RY S 1 5K C165 39pF K151 COIL 152 COIL HF PD 5 5 198 185 COIL 187 181 COIL HV AMPLIFIER VLFPD VLFPD Schematic Diagrams POWER UP DORMANT 57258 STANDBY DORMANT AC VOLTAGE STANDBY AC VOLTAGE OPERATE DC amp RC CURRENT STANDBY DC CURRENT OPERRTE CURRENT OPERATE 57008 CURRENT STANDBY 57008 CURRENT OPERATE HV_SENSE ZERO ERGA HV AMPLIFIER LFPD LFPD MFPD
9. SPCCHICAM ONS NP 5725A Instruction Manual 1 2 Introduction and Specifications 1 Introduction Introduction 1 1 The Fluke 5725 Amplifier enhances the 5700A Calibrator in the ac voltage ac current dc current functions The 5725 operates under complete control of the 57004 through an interface cable supplied with the 5725 A diagram in the specifications tables at the end of this section illustrates the extended ac volt hertz product achieved by using a 5725A Increased ac voltage load limits allow using the 5700A Calibrator in systems with long cables Voltage output from the 57254 is available at the 57004 Calibrator front or rear binding posts This eliminates the need to move cables during a procedure that requires amplified as well as standard calibrator outputs The 57254 front or rear panel OUTPUT binding posts are only for current output Extended range ac and dc current is supplied through them Since most meters with a high current range use a separate high current input terminal this configuration normally eliminates the need to move cables during a procedure If a single point current output is needed the 5700A Calibrator can be configured to source all current outputs through the 5725A binding posts Enhancements to 5700A ac voltage output capability provided by the 5725A are as follows e Frequency limits at higher voltage increase to 100 kHz at 750V 30 kHz at 1100V e Load
10. esee High Voltage Supply Section Switching Section roii HEEL Current Limit 5 System Supply Section Fan Supply 5 Digital Assembly 5 200000 PR External RAM 5 2 diui Den a 4 1 5725A Instruction Manual 4 30 Optoisolator 4 31 Break Detect C ircuttry roe ettet 4 32 Power Up and Reset Circuitry 4 33 Watchdog Time tess eine eter e Ire bene bete eaten 4 34 Current Amplifier Assembly A2 sse 4 35 Error Amplifier Section 4 36 Output Stage 4 37 Monitor 4 38 Control and Switching Section 4 39 Power Supply 5 acie eot 4 40 High Voltage Amplifier A3 4 41 Input Amplitiet er 4 42 Inte tator ea 4 43 Window Cor paratot 4 44 Input lamp eorr et Er e Pei 4 45 Transconductance and Cascode Stage 4 46 iuit aaa 4 47 Midstage 400V Filtet eec 4 48 High Voltage Heat Sink Assemb
11. C181 m STANDBY VOLTAGE STANDBY 9 18 CURRENT STANDBY 57254 1601 ag44f eps Figure 9 6 A6 High Voltage Sense PCA aq63f eps 8 MFC BOOST pex INTERFRCE m CONNECTOR R3 BOOST IN y R4 m B FEEDBRCK gt 104 B OUT HI 2 B SENSE_HI B SENSE LO TO R404 PG4A5 Schematic Diagrams 3 1 4 106 MP813 WIRE 7 6 LEN IN ig liac TEES AMP VIA INTERCONNECT 107 8 Ji 2 v a 6 TO CURRENT VIR INTERCONNECT CALIBRATION ee C188 c T R1 NES DE ciel 7 ICRL I FDBK PG2D4 u18g CIO5 1 1 VCOM 2 8 LTIB12A 1PF oko luF TP 186 luF R112 lt Ripa 215 1 21 105 40 2K R118 2 88K z VC M cus 6 RC RC MUX VR1802 1g 4 7 6203 CIRCUIT 71007 3 3 222 CAL 4 100pf OPER C125 wigi R124 1 5K 15V C186 lt VCOM R186 lur MEORE TP103 187 215 R126 2103 3 9 gt 1 2 2108 20K j alek gt 1 5 5 E185 243924 HVSENSE SEL PG3C2 100 22087 OPER
12. 0515 5 10 0507 20 30 1 zi 5 15 E501 2 0 T 5 1501 TP508 T E TP507 mE 5 509 TP506 150 003 1509 1501 N 2 l R510 C506 C508 C510 C519 C521 C507 9511 9514 9513 0502 0505 0506 5725 1650 aq40f eps Figure 8 6 A5 Digital PCA 8 29 5725A Instruction Manual 8 30 Table 8 7 A6 High Voltage Sense PCA Reference Designator C100 C121 C101 C103 C106 C107 C109 C111 C114 C115 C117 119 6124 125 150 152 154 157 163 166 C167 C169 176 C181 183 C102 C104 C127 C105 C108 C110 C112 C122 C123 C177 C113 C128 C120 C153 C155 C156 C158 161 C162 C164 C165 C168 C180 C401 C402 C403 CR100 CR103 CR104 CR150 153 CR101 CR102 CR105 108 CR401 404 CR405 E105 E155 H27 H108 H110 H121 H126 J102 J118 124 J152 J401 J402 Description CAP POLYCA 1UF 10 50V CAP POLYES 0 1UF 10 50V CAP POLYCA 0 15UF 5 50V CAP CER 680PF 5 50V COG CAP PORC 1 0PF 0 25PF 1000V CAP CER 10PF 2 50V COG CAP TA 10UF 20 35V CAP CER 100PF 5 50V COG CAP POLYES 0 1UF 10 50V CAP CER 3300PF 5 50V COG CAP POLYES 0 01UF 10 50V CAP AL 22UF 20 35V CAP CER 39PF 2 50V COG CAP POLYES 0 47UF 10 50V CAP AL 600UF 75 10 15V SOLV CAP AL 47UF 20 50V SOLV PRO CAP CER 0 22UF
13. 2 220 co OOH zal FAN 10 15 15 98 joc 15 15 68 60 15 FAN SA 36 15 15 10C 15 15 78 7C 15 al 148 14C 116 58 158 15C KCOM 3c _ KCOM 28 2c ACV OPERATE BELOW 128 2 ACV OPERATE 120Hz 35kHz 128 12C 48 4C ACV OPERATE 3 SkHz TO 3 kHz ACV OPERATE 3 kHz TO 18 kHz I38 19C VCOM 5 5c p VCOM HVSTROBE 48 4C HVCLR 6 T mn 78 7C sn sc 5 P351 oS 15 CROIS 1 4 CR013 CROI SYSTEM ino QIC esws i 1N4448 1N4448 144448 1N4448 PS 148 1 41 4 148 14 VCOM 28 2 VLFPD 158 15 KCOM FPO I38 13C VLFPD 14C HVCLR 15 _ 128 12 15 148 9A bi 1 uu 1 LFPD 15 isa 13 15 M 158 15 CLRMPD HVTEMP M 18C jen BC HV IN 58 16 CLAMPS 6n__ 16 P853 FBN IN 982 90 V IN POWER AMP 78 7C IN 178 17C ICRL I FB ITEMP M ICOMPLM ICOMPLM 158 15C CLRMPD J1gg ES ICAL T FB 12 MCOMI 68 16 ITEMP M CLR IA IC F
14. 3SN3S 6 SSS 1N33230Q9 APS N 59 h HH Qu e Cen 5 3 06 amp 4 5725A 4201 3 of 4 aq34f tif Figure 8 8 A12 Transformer Enclosure Assembly cont 8 37 5725A Instruction Manual 8 2 PL 2 PL 73 3 a a REF SMALL REF LARGE 73 22 a 5725A 4201 4 of 4 aq35f tif Figure 8 8 A12 Transformer Enclosure Assembly cont 8 38 List of Replaceable Parts 8 Table 8 9 A30 Inductor PCA Hetereues Description Fluke steck Tot Qty Notes Designator No J1 CONN MATE N LOK HEADER 4 PIN 512269 1 L1 L2 CHOKE 490888 2 W1 HARNESS LINE VOLTAGE 843011 1 1 For schematic See A6 section 9 G Y BLK WHT L2 gt ce 5725A 7603 A30 860119 REV 5725A 1603 aq42f eps Figure 8 9 A30 Inductor PCA 8 39 5725A Instruction Manual 8 40 Figure No 9 1 9 2 9 3 9 4 9 5 9 6 9 7 Chapter 9 Schematic Diagrams Title AT Interconnect PCA eese A2 Current Amplifier PCA sese High Voltage Amplifier PCA eene A4 Power Supply AS Digital High Voltage Sense A12 Transformer En
15. 350 1 75 FROM NOTES 6 LAST REF DES 5 SHEET 2 C368 CR364 2351 52 0351 R363 TP36 0354 VR3S3 AND 7354 CR358 7 REF DES NOT USED ON SHEET 2 56 8 2350 PIN 8 PULLED FOR KEYING CONNECTOR IN4Q04 0303 0308 0310 FRONT 8311 9314 FRONT 0315 0316 388 0321 0324 5 358 lgggguF CR352 1434084 1448048 C367 33uF 1 40048 0301 0382 0312 0313 0350 5 0317 0328 gir 1351 0350 0351 C354 C355 B 1uF CR354 144004 F AN 188 15V 14 88 8C 9 gt COMPONENTS INDICATED ARE INSTALLED 5724A ONLY VCOM 128 CR356 14824 2UV iA TP354 5 20V 11 58 5 BR 15 6 CR357 11482 7C J351 HVCOM M P61C4 B 488 MON 0182 4 MON 61 2 400 IMON P6168 TO FROM SHEET 1 400 IMON PG1C8 HV SUPPLY PG1C8 HVCLR P6188 HVSTROBE _ P5188 TP360 5725A 1031 144004 2 of 2 1 Figure 9 4 4 Power Supply PCA cont 9 15 5725A Instruction Manual DIGITAL PWB 5725A 7651 RE u 843081 A5
16. Notes 8 31 5725A Instruction Manual 8 32 Table 8 7 A6 High Voltage Sense PCA cont Reference Designator R154 R155 R156 R158 R168 R173 R162 8171 8172 8175 8178 8401 8402 8403 8404 RT401 RT402 RT403 RV101 RV155 RV151 154 RV401 SW150 SW402 404 TP100 TP101 TP103 107 TP151 154 156 157 TP159 161 U100 U101 U102 U103 U105 U150 0151 U152 U155 U153 U154 U156 U157 U158 U159 U161 U160 VR100 103 VR105 VR151 W002 woog Z100 2150 Description RES MF 20K 0 1 0 25W 25PPM RES MF 13 7K 0 1 0 125W 25P RES CF 3 9K 5 0 25W RES CF 10K 5 0 25W RES CF 3M 5 0 25W RES CF 4 7K 5 0 25W RES CF 2K 5 0 25W RES MF 6 19K 1 0 125W 100PP RES CF 20K 5 0 25W RES CC 56 10 0 5W RES CF 47K 5 0 25W THERMISTOR DISC NEG 10 15 THERMISTOR DISC 4 85 25C VARISTOR 33V 10 1 0MA VARISTOR 8 2V 35 1 0MA VARISTOR 430V 10 1 0MA SWITCH SLIDE DPDT SWITCH SLIDE DPDT LINE SELECT JUMPER WIRE NONINSUL 0 200CTR C OP AMP VLOW IB LOW VOS 8 PI RMS CONVERTER TESTED 400 OHM A C OP AMP LOW BIAS HIGH BANDWI C OP AMP LO OFFSET VOLTAGE LO C OP AMP PRECISION LOW NOISE C COMPARATOR DUAL LO PWR 8 PI C CMOS 16 CHANNEL ANALOG MUX IC CMOS OCTAL D TRANSPARENT LA C OP AMP DUAL LO OFFST VOLT L C CMOS 10BIT DAC 8BIT ACCUR C C BIMOS 8 CHNL HI VOLT DRVR W SOLATOR OPTO LED TO DARLINGTO C CMOS DUAL RS 232 TRANS RECE ZENER UNCOMP 3 3V 5 20 0MA 0
17. 7 8 Problem 5 Fault When Entering Current Operate 7 9 Reduced Voltage Troubleshooting Mode 7 10 Testing the Power Supply Itself List of Replaceable Parts 8 1 8 2 How to 8 3 Manual Status eee 8 4 Newer 8 5 Service GT Schematic Diagram s J J iii 5725A Instruction Manual List of Tables Standard Equipment tested Line Power Cord Types Available from Fluke Pront Panel Features eie emit Rear Panel uoce emt tiere e i Internal Fuse Data Signal Transformer Usage High Quality Reference Name Destination Signals Monitor ed by the Analog Monitor Section 5725 Fault Code Analog Monitor Final Assembly 1 Interconnect E3ults 220 mans we A2 Current Amplifier PCA High Voltage Amplifier PCA A4 Power Supply
18. SNINUYM 22682 9962 z1 0 6160 8120 110 1060 occu S N 9 s s Is 5649 S 9 549 5 a 9 ziga 22 E E Liga 57254 1631 aq39f eps Figure 8 5 A4 Power Supply PCA 8 27 5725A Instruction Manual 8 28 Table 8 6 A5 Digital PCA Reference Designator C501 C503 511 C516 C518 C519 C521 C502 C520 C512 C513 C514 C517 C515 C522 530 C531 CR501 CR504 CR505 CR502 CR506 CR507 CR508 CR509 E501 4501 4502 4504 J506 509 J512 J515 L501 501 MP815 R501 R502 R509 R503 507 R508 R510 502 TP501 510 U501 U510 U502 U503 U504 U505 U506 U507 U508 U509 U511 U514 U512 U513 U515 Y501 2501 2502 Description CAP POLYES 0 1UF 10 50V CAP AL 22UF 20 35V 15PF 20 50V COG CAP POLYES 0 33UF 10 50V CAP TA 10UF 20 35V CAP CER 470PF 5 50V COG CAP CER 100PF 5 50V COG LED GREEN LIGHT BAR 5 0 MCD LED RED LIGHT BAR 6 0 MCD DIODE SI SCHOTTKY 40V DO 34 HEADER 1 ROW 100CTR 4 PIN SOCKET IC 0 070 CTR 64 PIN HEADER 2 ROW 100CTR RT ANG 34 SOCKET IC 28 PIN SOCKET IC 8 PIN SOCKET IC 24 PIN CHOKE 3 TURN PAD ADHESIVE CABLE INTERCONNECT FRONT PA RES MF 1M 1 0 125W 100PPM RES CF 1K 5 0 25W RES CF 47K 5 0 25W RES MF 11 5 1 0 125W 100PPM RES CF 10K 5 0 25W SWITCH PUSHBUTTON SPST MOMENTA JUMPER WIRE NONINSUL O 200CTR IC CMOS
19. addng LL ae 081 7489 NOSN3S NIUM 603 90015 IH 3SN35 8 5013 80045 01 110 8 i i I ASSY AH WO234 100 AH 401534405 3283M31NI 862 5 900 5 72880334 8 49045 WOYd 15008 asada 74559 1433315 OL ASSY AH OL aq21f eps Figure 4 5 High Voltage Sense Assembly Block Diagram 4 31 5725A Instruction Manual e Serial Interface Guard Crossing Section The serial interface guard crossing section consists of an RS 232 interface integrated circuit that provides the hardware for 5700A 5725A communication within the 5725A Two optoisolators provide the serial guard crossing to the Digital assembly A5 and two more provide integrity checks for the interface A relay remotely powered by the 5700A provides a software independent path to guarantee 5725A shutdown if the 5700A 5725A cable is disconnected e Analog Input Switching Section The analog input switching section consists of a bank of relays that route ac and dc voltages and dc currents from the 5700A to various functional blocks inside the 57254 Assemblies that receive inputs from the Analog Input Switching Section are the High Voltage Amplifier assembly A3 the Current Amplifier assembly A2 and the sense amplifier section of the High Voltage Sense assembly e Control Section
20. 0 02 OHM 29 52 IOUT LO e L K204 DIGITAL AS ASSEMBLY CPU VCOM S Ak CURRENT SUPPLY HIGH CURRENT AMPLIFIER I OUT 5 POWER TRANSFORMER CURRENT AMP 82 ASSEMBLY HVSUPPLY CABLEOFF RELAY ORIVERS CLAMPD TO AMP RSSY L CLAMPS MONCOMP RECEIVE TRANSMIT p qp CER CRBLEOFF p 08 07 STROBE 1 STROBE 2 STROBE 3 STROBE 4 ROBE STROBE 21 STROBE 22 POWER SUPPLY 84 ASSEMBLY ope 5 5V prr HE NE UN HIGH VOLTRGE SENSE R6 RSSEMBLY 8 BIT DRC SYSTEM 20 SUPPLY 15V KCOM B XMIT OPTO ISOLRTORS Eit NI lt TRANSMIT PACOM HVSUPPLYx HVCLR DRCOUT o lt N O HV SUPPLY 100v 400 IM 402 M 400V 57008 5725A INTERFACE gt 400 INTERCONNECT A1 ASSEMBLY 5VK KCOM 400 IM HIGH VOLTAGE AMPLIFIER R3 ASSEMBLY 15 400V 15V 480V 5 49K 5 49 OVLD ACV CALIBRATION THERMAL SENSOR 7 VCOM amp 0 VCOM at FROM HV SENSE ASSY CPU BOOSTEE 57258 BLOCK DIAGRAM NOV 23 1988 aw 1 Figure 4 1 5725 Overall Block Diag
21. REFER 57258 MANUAL 74HCT373 2 1 1 1 1 1D 10 01 4 2 205 DCOM aD 3018 D 04 1315 oe SD Ge IS 16 14 7 79 19 FRONT PANEL LED S 11 13 STROBE 2 ENABLE Tee CRS81 CRS 4 5 GREEN 27128 40514 12 HVSUPPLY q OE CRS02 CRS86 507 RED 18 11 11 18 G 7 s Al te 0 12 081 DCOM V 82 8 02113 082 s DCOM 522 e 2 03 15 Des 84 04 STROBE 2 5VD DATA LATCH 15 SELECTED BY 5VD p 4j pr C524 BSS as os 17 065 815 814 gt Re 06 1 16 iss 20 2502 C525 R7 3 A7 o7 19 7 5 TPS1 RNRLOG MON 5 E 818 21 pig STROBE 21 6586 0507 TROUBLESHOOT ING Da3 8 03 C529 All 23 gii 47 STROBE 55 47K 47K D4 812 2 412 amem MICROCONTROLLER eau 05 4 527 AM q 38 TRANSMIT TRANSMIT 087 18 C528 2570 1 vPP HVSUPPLY P20 TIn 98 d 06 Dw 224 SVD HVSUPPLYx P21 Tout P31 Di DE b 4j or C523 ROMSEL 28 cew 28 71 P22 SCLK 2 02 56 002 7 pz 14 Fine Tes 12 P23 Rx 233 03 SS _ 003 DATA LATCH x 0515 CLAMPS 3 4 13 p24 Tx 234 04 564 004 DCOM 47 BpF 16K X 8 ROM C 5 6 14 p25 102 235 05 93 005 gt 5 9 FROM 15 226 103 6 06 52 DES EXTERNAL IS SELECTED 12588 16 P27 TCLK 7 07 L9l 087 MONC
22. gt T 09642 A a vega 21582 1 1 yoru 9igu 19632 37 29641 P 809 oze estia 1664 qug UU 5 i 2 ELAD AOOY 50582 x O uA 8 2 5968 ose 2 zoey 212 2 sepu u L ung eg d 5 a a 2 8 1 1 R l aaa toco vo E81 z 5 sigu 1 a 8065 29 ET see 106 1063 mw teen m Z cms L s vitu lt 2 al zetu 91 1162 9ogu gt 7 octo 81 e 1068 9064 s eset gusu 12942 5 8 S cocu ei z 169 on om gt e 2 Cn 2 S locu Loga zogu e z 8 gt e 90641 e s gt 8 IR OEMS 20 05 IER 9052 ozgu orgu m zoer uga 05 o 2 eim u 1741 5168 view soga e 0962 NO 231 ese SE 9268 zoga 52682 ovga GOYA eeu 291104 ZORIA voga leu TT HOTH soga loca logan
23. A EI T gt 5604 8623 o xw i 2822 5 R ll 2 29 R620 gel fe 5 nso 55 R650 RE 1515 R628 1631 9 R614 R649 R627 lt R613 8632 6502 oc 8 8541 8646 8634 R643 VR601 C622 sf R633 s 5 5 MO uu 0605 8 R640 0606 x 8635 164 1617 san 9 R637 R647 5 R675 s R604 R642 VR656 e R601 1618 o R607 R a R605 2 214 612 n CR653 R619 o 8 R639 R668 69 VR654 C667 n xl R638 R669 5 S vR662 R753 Hai C664 R688 1698 R691 1680 C653 vR663 8685 eS 2 g 8605 E Rn VR664 E 1696 A VR666 2 8 M Pl lt 29 5 R694 2 2 1693 1 VR665 E R689 Rc EE R660 LUT aso Res R687 CREST VR659 1 8682 z a R686 R684 a s CR656 z 8680 C658 n CR655 x R681 9 VR657 cr ___8676_ 699 lt e zs 7 __ x x 0660 8672 1152 S R667 kwa em i R666 R670 2 SH VR655 R674 9 R663 C656 e Fr inn VR658 R662 C655 5 CR654 8664 SE I R661 R658 vR653 9 8657 CR652 R660 R VR652
24. Input amplifier 4 24 ly A2 6 11 Index Input clamp Integrator Midstage 4 27 Midstage 400V filter 4 27 Signal transformers 4 29 Temperature monitoring 4 29 Transconductance and cascode stage 4 27 Window comparator 4 26 B Binding posts CURRENT OUTPUT Enabling front or 6 15 HI LO Block diagrams Current assembly 4 20 Digital assembly 4 17 High Voltage Amplifier assembly 4 25 High Voltage Sense assembly 4 31 Overall 4 4 CABLE OFF indicator Cables 5700A Calibration interface 2 6 Line power 2 7 Cables UUT 1 4 Calibration CALIBRATION switch 3 3 CHASSIS GROUND connector 3 7 Cleaning 6 5 Air filter General 6 5 5725A Instruction Manual PCAs 6 5 H Clearance requirements 2 5 5 Communication 5700A and 5725 A r8 High Voltage Amplifier assembly A3 4 24 Access procedure 6 12 Connectors also see binding posts Block diagram 4 25 ATOR Theory of operation 4 24 Line power High Voltage Sense assembly A6 4 30 Access procedure 6 13 Controls See switches 1 Cooling considerations Th E Cord line power 2 4 2 9 eory peration Current Output Standby 4 7 488 remote 3 3 Current Amplifier assembl 2 4 19 Indicators 3 5 Access procedure 5725A STANDBY 3 5 Block diagram 4
25. The control section is implemented with a bank of four latches connected to the microprocessor data bus pair of latches with their integral drivers control relays a pair of latches control the 16 channel multiplexer and the bipolar output dac in the analog monitor section e AC Line Voltage Switching Section The ac line voltage switching section is independent of the other five sections of the High Voltage Sense assembly The ac line voltage section contains three switches labeled S2 53 and 54 on the rear panel that configure the input to the transformer to accept one of eight nominal line voltage levels Also included in this section are a simple unregulated power supply and a time delayed relay driver circuit These circuits control a shunt switch around a pair of surge current limiting NTC thermistors Caution To avoid meter damage do not measure the ac line voltage section unregulated supply with a meter tied to earth ground Sense Amplifier Section 4 55 4 32 Op amp U102 transistors Q100 through Q103 and their associated parts comprise the forward gain elements of a precision ac amplifier Since this monolithic device does not accept supply voltages large enough to accommodate output swings of 15 6V a quartet of discrete transistors is configured as an output stage with voltage gain This provides the necessary output swing of 11V rms as well as limits the additional forward gain of the overall amplifier to simplify f
26. e Power Supply Section The power supply section contains two bipolar power supplies Regulated 20V supplies and unregulated 12 supplies are referenced to ICOM and power only the output section The error amplifier section and control section are powered from the 15V and 5V 5725A system supplies Error Amplifier Section 4 35 Refer to page 1 of the Current Amplifier schematic Components 17201 2201 R235 C230 and Q211 make up the outer loop error amplifier a differential amplifier with high common mode rejection ratio The outer loop error amplifier controls a first order feedback loop that determines the dc accuracy and uncorrected ac frequency response of the current amplifier Q211 shuts off the outer loop error amplifier during standby and through modulation of its channel resistance by R255 and C210 yields a soft start transition into the operate modes Components U202 R232 R241 R251 R252 R234 C213 and Q213 comprise the inner loop error amplifier The inner loop error amplifier works with the outer loop amplifier in a second order feedback loop that significantly diminishes the effects of output stage non linearities Q213 reduces the inner loop gain during standby Refer to page 2 of the Current Amplifier schematic Resistor R272 is a specially constructed 0 02Q shunt resistor that senses the Current Amplifier output U208 and Z203 comprise a gain of ten differential amplifier called the calibration amplifier Cal
27. 7 5 CAL C122 T C107 328 TuF 0101 58099 VCOM 47 TO POWER SUPPLY INTERCONNECT 109 185 R184 3 3 CR127 BAIN SENSOR AHP L JIE ties DIVIDE BY un 183 luF 47 198 1N4448 328018 10 Lov 1 182 CR108 OPRSB2RP CR184 ei i 2 B K 144448 Em JPRD18 R129 0182 VR183 MCM S8599 C119 luF C123 5 uF 1102 2507 3 2 NOTES 1 ALL RESISTANCES IN OHMS AND D CAPACITANCE IN MICROFRRRDS UNLESS OTHERWISE NOTED 2 ALL RELAYS IN NONENERGIZED POSITION 3 118 SENSOR SHIELD AND 119 DIGITAL SHIELD TIED TO 4 VOLTAGES IN BOXES ARE TYPICAL 159 B 5VCOM TP16 EARTH GROUND PG3A8 161 MUXOUT 201 HVSENSE MUX CIRCUIT R127 C184 68 7 VCOM B 1 RC RC PG1D2 TP121 VCOM PGiC2 102 NOT USED 103 V FDBK PG1C3 TP184 MCOM PG1B8 105 B SENSE LO PG1A7 106 RMS SENSOR OUTPUT PG1D4 TP197 HV OUT PG1C3 151 MONCOMP PG2B1 152 DAC QUT PG2B2 153 5VKS PG3D6 54 5 TP156 B SV PG3A6 157 RCV PG3AS 5725 1001 1 of 4 Figure 9 6 A6 High Voltage Sense PCA cont 9 19 5
28. Bescheinigung des Herstellers Importeurs Hiermit wird bescheinigt daB Fluke Models 5725A Amplifier bereinstimung mit den Bestimmungen der BMPT AmtsblVfg 243 1991 funk entst rt ist Der vorschriftsm Bige Betrieb mancher Ger te z B MeBsender kann allerdings gewissen Einschr nkungen unterliegen Beachten Sie deshalb die Hinweise in der Bedienungsanleitung Dem Bundesamt f r Zulassungen in der Telekcommunikation wurde das Inverkehrbringen dieses Ger tes angezeigt und die Berechtigung zur berpr fung der Seire auf Einhaltung der Bestimmungen einger umt Fluke Corporation OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals observe all safety precautions To avoid electrical shock hazard the operator should not electrically contact the output hi or sense hi binding posts During operation lethal voltages of up to 1100V ac or dc may be present on these terminals Whenever the nature of the operation permits keep one hand away from equipment to reduce the hazard of current flowing thought vital organs of the body Terms in this Manual This instrument has been designed and tested in accordance with IEC Publication 348 Safety Requirements for Electronic Measuring Apparatus This manual contains information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in safe condition
29. JUMPER REC 2 POS 100CTR 025 TRANSISTOR SI P MOS POWER 500V TRANSISTOR SI NPN HI VOLTAGE T TRANSISTOR SI PNP SM SIG SELEC TRANSISTOR SI PNP 40V 0 35W TO TRANS SI N JFET REMOTE CUTOFF TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI N MOS 40W 500V T TRANSISTOR SI BV 40V 40W TO RES CF 470K 5 0 25W RES CC 33K 10 1W RES CF 33K 5 0 25W RES MF 10K 1 0 125W 100PPM RES CF 6 8K 5 0 25W RES CF 1 5M 5 0 25W RES CF 100 5 0 25W RES MF 0 39 5 2W RES CC 15K 10 0 5W RES CF 100K 5 0 25W RES MF 86 6K 1 0 125W 25PPM RES MF 28 7K 1 0 125W 100PP RES CF 10K 5 0 25W RES MF 40 2K 1 0 125W 100PP RES MF 499 1 0 125W 100PM RES MF 6 19K 1 0 125W 100PP RES MF 604 1 0 125W 100PPM RES MF 60 4K 1 0 125W 100PP RES CF 2K 5 0 25W RES CF 240K 5 0 25W RES MF 20K 1 0 125W 100PPM Fluke Stock No 541730 830844 735365 530253 782482 782482 722934 722934 650846 650846 698233 707968 698225 782540 782540 418459 342634 342634 109538 109538 348888 348888 168260 368761 349001 349001 348771 348771 348771 219386 108530 108530 348920 257402 235176 348839 348839 235333 168211 283911 320309 291419 441469 442459 291872 Tot Qty m Notes 8 25 5725A Instruction Manual 8 26 Table 8 5 A4 Power Supply PCA cont Reference Designator R351 R355 R361 R362 RT350 RT351 354
30. Shows the various settings of the line voltage switches and the correct replacement fuse for operating voltages of 110 90 to 132 and 220 180 to 264 volts ac Refer to Accessing the Fuse in Section 2 for the fuse replacement procedure Line Voltage Selection Switches Select the operating line voltage Refer to Selecting Line Voltage in Section 2 for instructions on how to select operating line voltage Fuse Holder The line power fuse Refer to Accessing the Fuse in Section 2 for fuse rating information and Line Voltage Fuse Rating Label the fuse replacement procedure x CHASSIS GROUND Connector If the 5725A is the location of the ground reference point in a system the CHASSIS GROUND binding post can be used for connecting other instruments to earth ground The chassis is connected to earth ground through the three conductor line cord Line Power Input A grounded male three prong connector that accepts the line power cord 3 3 7 5725A Instruction Manual Turning on the 5725A Amplifier 3 4 Warning To avoid electric shock make sure the 5725 is safely grounded as described in section 2 Caution Before turning the 5725A on make sure that the line voltage selection switches are set properly for your line voltage Refer to Figure 2 3 or the line voltage switch label and check the line voltage setting now if you have not already done so When you turn on the 5725A all six front panel indicators lig
31. ZENER UNCOMP 5 1V 5 20 0MA 0 CABLE HIGH VOLTAGE OUTPUT HARNESS SUB D RNET MF HERM SIP 5700 HI V AMP RES CERM DIP 16 PIN 8 RES 1M Fluke Stock No 810564 851340 810416 810416 697102 746172 721571 810457 283911 441477 109009 348896 500371 838102 816421 715052 519355 697466 817353 816090 816090 816090 816090 875760 842591 854133 605980 782920 478354 723684 743294 685164 524868 782912 640664 799445 820423 853700 842950 843024 803536 461731 Tot Qty 20 m N m Notes List of Replaceable Parts 8 eor 90182 1212 20212 0143 iori 1011 GOldL 1112 STIM 1075 01 58 0141 NO2N 66641 vov 10 82 0735 gt 20 _ 1078 sory 20782 gt gt gt 1070 04 1 072 P tors coria Q S 39V110A HOTH r oi 9NINHVM 20714 1071 eT IN3S38d 39V1104 om SNIVW vz 92 2075 095 vovs vl al 1091 52165 090578 OV 3SN3S JOVLIOA HOIH 101A Xf 1819 1218 1918 09182 0912 vii z zotan 25181 eth osiog ae 69141 5 d Hp 8941 ub SPodty 26182 vor LL De DU DE CIE S127 dig foo 081 81lu wp E x 1 TE
32. 100 uV Introduction and Specifications Specifications Absolute Uncertainty t 5 C from calibration temperature 90 Days 180 Days t ppm output uV 6 5 75 74 75 84 75 94 8 3 5 1 2 6 1 2 7 1 2 8 1 2 3 5 3 5 4 7 4 8 4 3 5 6 5 8 7 8 8 8 5 100 6 100 8 100 9 100 7 600 8 600 10 600 11 600 Relative Uncertainty 1 24 Hours 90 Days ppm output uV 2 5 5 4 5 2 5 1 2 4 1 2 1 5 3 3 5 4 1 5 6 3 5 8 2 5 100 4 100 3 600 4 5 600 Secondary Performance Specifications and Operating Characteristics Included in Uncertainty Specifications Range 220 mV 2 2 11V 22N 220V 1100V Stability 10 24 Hours ppm output uV 3 3 3 1 342 5 4 5 5 40 5 200 Temperature Coefficient Note Linearity t1 C 0 10 C 10 40 C and 40 50 C ppm output uV C 4 4 1 54 5 14 2 3 4 1542 14 6 15 2 1 1 5 3 2 2 4 1 5 3 344 345 1 5 40 1 40 5410 3 200 1 200 Bandwidth 0 1 10 Hz ppm output uV Noise pk pk 154 1 15 4 15 2 15 4 15 60 15 300 Bandwidth 10 10 kHz 50 150 500 Note Temperature coefficient is an adder to uncertainty specifications that does not apply unless operating more than 5 C from calibration temperature Minimum output OV for all ranges except 100V for 1100V range Maximum load 50 mA for 2 2V through 220V
33. 20 05 700 20 40 80 15 15 30 15 40 10 20 035 700 40 20k 12 8 2 10 4 15 10 30 035 700 22V 20k 50k 15 10 10 20 20 20 30 50 035 700 50k 100k 15 10 10 40 20 40 80 80 035 700 100k 300k 30 15 80 150 80 150 100 700 3 800 300k 500k 70 100 80 300 80 300 200 1 1 mV 3 800 500k 1M 150 100 80 500 80 500 600 3 0 mV 2 800 10 20 150 200 50 1mV 50 1 10 2 mV 05 10 mV 20 40 80 150 15 300 15 300 10 2 mV 05 10 mV 40 20k 12 80 2 80 4 80 10 3 mV 05 10 mV 220V 20k 50k 15 100 10 100 20 100 30 6 mV 05 10 mV 50k 100k 15 100 10 500 20 500 80 3 mV 1 13mV 100k 300k 30 400 80 600 80 600 250 25 mV 1 5 50 mV 300k 500k 100 10 mV 80 800 80 800 500 50 mV 1 5 50 mV 900k1M 200 20 mV 80 1 80 1 mV 1000 110 mV 3 5 100 mV ppm output mV ppm output C output 1100V _50 1k 20 5 2 5 10 1 07 1 1 9 5725A Instruction Manual AC Voltage continued Secondary Performance and Operating Characteristics continued Included in Uncertainty Specifications 5725A Amplifier Temperature Coefficient Stability Load Regulation Distortion Range Frequency 19 0 10 C Note 2 Bandwidth 24 Hours 10 40 10 Hz 10 MHz 40 50 C Hz ppm output mV ppm output C ppm output mV output 150 pF 1000 pF 40 1k 104
34. 70 20k 50k 120 200 130 200 140 200 140 200 100 200 110 200 50k 100k 230 400 250 400 270 400 280 400 200 400 220 400 100k 300k 500 1 7mV 550 1 7mV 550 1 7 600 1 7 mV 500 1 7mV 5504 1 7 mV 300k 500k 12 5 mV 13 5 mV 13 5 mV 14 5 mV 1296 5 mV 1396 4 5 mV 500k 1M 26 9 mV 28 9 mV 29 9 mV 30 9 mV 26 9 mV 28 9 mV ppm output mV output mV 10 20 500 10 550 10 600 10 600 10 500 10 550 10 20 40 150 3 170 3 170 3 180 3 150 3 170 3 100 uV 40 20k 75 1 80 1 85 1 90 1 45 1 50 1 20k 50k 200 4 220 4 240 4 250 4 100 1 110 1 50k 100k 500 10 550 10 600 10 600 10 300 10 330 10 100k 300k 15 110 15 110 16 110 16 110 15 110 1596 100 300k 500k 50 110 52 110 53 110 54 110 50 110 52 110 500k 1M 1 20 220 1 25 220 1 25 220 1 30 220 1 20 220 1 20 220 1100V 11 mV 50 1k 75 4 80 4 85 4 90 4 50 4 55 4 5725A Amplifier 40 1k 75 4 80 4 85 4 90 4 50 4 55 4 1100V 1k 20k 105 6 125 6 135 6 165 6 85 6 105 6 1 mV 20k 30k 230 11 360 11 440 11 600 11 160 11 320 11 750V 30k 50k 230 11 360 11 440 11 600 11 160 11 320 11 50k 100k 600 45 13 45 16 45 23 45 380 45 12 45 Introduction and Specifications Specifications AC Voltage continued Secondary P
35. 80 20 50V Z5U DIODE SI BV 75V lIO 150MA 500MW DIODE SI BV 20V IO 50MA 250MW DIODE SI BV 35V LOW LEAKAGE DIODE SI 400 PIV 1 DIODE SI BV 75V IO 150MA 500MW SOCKET SINGLE SOLDER FOR 064 TERM FASTON TAB 110 SOLDER GROUND STRIP BECU SPRING FINGE RIVET S TUB OVAL AL 087 250 RIVET S TUB OVAL STL 118 281 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION CONN DIN41612 TYPE R 64 PIN SOCKET SINGLE SOLDER FOR 021 CONN COAX SMB M PWB CONN MATE N LOK HEADER 4 PIN HEADER 1 ROW 156CTR 12 PIN Fluke Stock No 271619 649913 649913 649913 649913 649913 649913 649913 649913 343616 743351 603571 713875 816512 816512 831495 649913 830612 715037 817056 714840 714840 697409 557660 822403 649939 659516 659516 836288 723817 831586 203323 851287 512889 370619 838482 650283 807347 464016 782094 851290 352450 512269 831354 Tot Qty 32 Notes Table 8 7 A6 High Voltage Sense PCA cont List of Replaceable Parts 8 Reference Designator J403 K101 K106 108 K111 K151 153 K102 105 K109 K401 L100 105 MP1 MP25 MP26 MP27 MP36 MP038 81 82 MP101 MP813 Q100 Q102 Q101 Q103 Q104 Q107 Q401 0105 Q106 Q150 R100 R123 R124 R157 R159 161 R163 167 R177 R101 R102 R103 R104 R108 R116 R105 R114 R106 R107 R117 R110 R113 R115 R119 R121 R122 R128 R129 R150 R112 R118 R120 R170 R125 R174 R179 R126 R127 R130 R131
36. Fault When Entering Current Operate Reduced Voltage Troubleshooting Mode Testing the Power Supply By Itself eee 7 1 5725A Instruction Manual 7 2 Troubleshooting Introduction Introduction 7 1 This section provides troubleshooting information in three parts First a listing of all 5725A fault codes is provided for reference in Table 7 1 Following that is a description of 5725A automated self diagnostics that you run from the 5700A Finally some manual tests are provided that can help you isolate a fault 5725A Fault Codes 7 2 Table 7 1 lists all 5725A fault codes Fault codes and descriptions appear on the 5700A Control Display in fault conditions The codes and descriptions can also be transferred from the 5700A in remote control operation Where fault messages are not self explanatory additional explanation is given in the table Self Diagnostics 7 3 The best way to begin looking for the source of a fault is to run self diagnostics from the 5700A diagnostics menu To run self diagnostics proceed as follows 1 Press the Setup Menus softkey If Setup Menus is not showing on the Control Display press RESET first to return to the 5700A power up state Press the Self Test amp Diags softkey Press the 5725A Self Diags softkey Begin testing with the voltage function Press the Voltage softkey A sequence of
37. GR 0 Remove the five retaining screws on the High Voltage Sense assembly Lift the High Voltage Sense assembly by pulling on the plastic wire tie loops and place the assembly in the service position Caution When reinstalling the assembly refer to Figure 6 6 and make sure cable harnesses are dressed as shown to avoid shorting wires to the bridge rectifier heat sink or chassis 6 13 5725A Instruction Manual Accessing the High Voltage Output Transistors 6 13 Warning During normal operation the high voltage heat sinks are at lethal voltage To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply To access the high voltage output transistors attached to four separate large heat sinks in the center of the instrument proceed as follows 1 Perform the Initial Access Procedure 2 Disconnect the heat sinks from the High Voltage Amplifier assembly by unplugging connectors J661 J662 J663 J664 Disconnect the temperature monitor by unplugging connector J603 3 Remove the four screws that retain the high voltage heat sink assembly at the bottom rails 4 Lift out the heat sink assembly being careful to keep the cables clear of obstructions during removal 5 Each of the four heat sinks is held in place by two screws one at the top rail and one at the bottom rail
38. List of Replaceable Parts 8 Reference Designator H437 H439 H443 H505 H506 H513 H545 13 6 1 2 MP3 MP5 MP9 MP15 MP16 MP39 MP47 MP302 MP304 MP306 MP308 MP309 MP310 MP311 MP312 MP405 MP410 MP412 MP414 MP416 501 510 511 MP512 MP513 MP514 1 w1 W13 W14 W15 W16 W44 XF501 Description SCREW PH P LOCK SS 6 32 750 SCREW TH P LOCK STL 8 32 250 SCREW PH P LOCK STL 6 32 625 NUT HEX BR 1 4 28 WASHER LOCK INTRNL STL 2671D WASHER FLAT SS 119 187 010 NUT EXT LOCK STL 6 32 3440D CORE TOROID FERRITE 047X 138X TRANSISTOR SET LABEL CE MARK BLACK TRANSISTOR SET HEATSINK HIGH VOLTAGE DECAL HEATSINK ASSY THERMISTOR CABLE ACCESS TIE 4 00L 10W 7 HEAT DIS ACC AL FOIL TO 3 SLEEV POLYOL SHRINK 187 0931 HANDLE INSTRUMENT GRAY 7 INSULATOR BINDING POST FRONT G REAR INSULATOR GRAY 3 BINDING POST RED BINDING POST BLACK DECAL FRONT NAMEPLATE TITTLE POWER BUTTON ON OFF DECAL WARNING SIDE EXTRUSION INSERT EXTRUSION ADHESIVE SIDE TRIM BOTTOM FOOT MOLDED GRAY 7 DECAL CSA LINE FILTER ASSEMBLY FAN ASSEMBLY BINDING HEAD PLATED BINDING POST STUD PLATED LABEL VINYL 1 500 312 5725 INSTRUCTION MANUAL CORD LINE 5 15 IEC 3 18AWG S VT HARNESS TRANSISTOR P661 HARNESS TRANSISTOR P662 HARNESS TRANSISTOR P663 HARNESS TRANSISTOR P664 CABLE ASSY 5700A 5725A I F _ HLDR FUSE 1 4 X 1 1 4 LOPROFIL Fluke Stock No 376822 853622 1521
39. VCOM System Supply Common Power Supply Monitoring High Voltage Supply Power Supply Monitoring Common 1 7V HVTEMP M Voltage Amp Heat Sink High Voltage Amplifier Monitoring Temp 2 0V ITEMP M Current Amp Heat Sink Current Amplifier Monitoring Temp 2 2V ICOMPL M Current Output Stage Current Amplifier Monitoring Drive Level FB Shunt Voltage Current Amplifier Calibration AC Operation Calibrator Output High Voltage Sense Calibration HVSENSE Sense Amp Output High Voltage Sense Calibration DAC OUT DAC Output High Voltage Sense Monitoring 0 08 2 0V FAN M Fan is On or Off Power Supply Monitoring Note 1 For single limit values the limit is equal to or smaller in magnitude to the value shown Theory of Operation 4 Detailed Circuit Description IC U156 is a dac whose digital input is under microprocessor control via data latch 0155 The 15V supply is the reference voltage amp U153A acts as current to voltage converter providing outputs between OV and 6 375V The desired output for the analog monitor function ranges from 2 56V to 2 56V Level shifting and scaling is accomplished by U153B by summing the output of U153A and the reference voltage for U156 Op amp U153B also forms an active two pole filter to reduce wideband noise The output of the dac is routed to both the multiplexer U151 and the analog monitor comparator U154A Resistors R171 an
40. Warning statements identify conditions or practices that could result in personal injury or loss of life Caution statements identify conditions or practices that could result in damage to the equipment or other property Symbols Marked on Equipment 7 DANGER High Voltage Protective ground earth terminal A Attention refer to the manual This symbol indicates that information about the usage of a feature is contained in the manual Power Source The 5725A is intended to operate from a power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Use the Proper Fuse To avoid fire hazard use only the fuse specified on the line voltage selection switch label and which is identical in type voltage rating and current rating Grounding the 5725A The 5725A is Safety Class I grounded enclosure instruments as defined in IEC 348 The enclosure is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired earth grounded receptacle before connecting anything to any of the 5725A or 5700A terminals A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Use the Proper Power Cord Use only the power cord and connector
41. ligu gt 020 7 10241 Siza 6120 m z Ligy 8 CE 8 ETIN 9120 3 rozy 124 9024 1 at 1128 2120 1928 02249 z zigu sgu vvgu 1929 v6gu 5 5 7 gt 5 50242 0 02 lvgu 628 8928 5 6624 vigdl 2628 1628 2242 1028 5624 0628 5 2 S x 55 012 5 122 n taza PZZ 4222 2 IE m dw E i 8 em 2222 isa S 8028 vigu 102 E z 802 102 Tezy 020 0528 m 92 I yz 8222 9128 ue 1728 10484 1020 2020 8 120 8122 5 2024 MEN 502 107 28 um P 1128 9828 9122 1122 60241 01241 WHODA 6622 072 0482 5128 6861 1 1 02 7702 ONTEMLOVINNVA 39014 aaa S 8122 20218 10218 4112 1593 02 4112 4112 1573 02 4112 1021 2023 10578 1291 5215 31 1 388402 5725 1650 aq37f eps Figure 8 3 A2 Current Amplifier PCA 8 19 5725A Instruction Manual 8 20 Table 8 4 A3 High Voltage Amplifier PCA Reference Designator C601 C602 C603 C606 C609 611 620 C604 C605 C607 C614 C654 C662 C608 C612 C619 C655 C656 C658 C659 C665 C666 C668 C613 C615 C621 C622 C652 C657 C616 C617 C618
42. plato efi 5 1 4 8919 sing 10 0911 9912 1918 9191 6912 20818 2510 6912 9511 20512 0612 vp AZIA 8 gory 9911 125188 asia 99148 g 1910 estal zsry isra jesi 1945 1017 1011 013 pr 7013 oglar 6513 8 t 9961 402 JN torr l 17702 9NIdnlD2vdnNyw 33011 0615 5725A 1601 ag41f eps Figure 8 7 A6 High Voltage Sense PCA 8 33 Instruction Manual Table 8 8 A12 Transformer Enclosure Assembly Reference Designator H1 H5 H39 H41 H43 H44 H49 H51 H53 H61 H65 H69 H73 H75 MP1 MP4 MP12 MP13 MP18 MP403 MP802 MP803 MP804 P2 P604 P403 1 2 T3 T101 TB001 W4 5 W17 wis Description SCREW FHU P LOCK SS 6 32 250 SCREW PH P LOCK MAG SS 6 32 2 SCREW PH P LOCK STL 6 32 625 SCREW PH P LOCK SS 4 40 187 SCREW PH P LOCK SS 6 32 500 SCREW PH P LOCK STL 6 32 750 WASHER FLAT STL 149 375 031 SCREW HH H LOCK STL 10 32 375 SCREW PH P LOCK STL 6 32 187 SCREW HH H STL 1 4 20 4 00 WASHER LOCK SPLIT STL 255 49 WASHER FLAT STL 260 375 032 SCREW PH P LOCK STL 6 32 375 SCREW PH P LOCK STL 10 32 625 BUSHING SNAP IN NYL 500 ID CABLE ACC CLAMP 687 DIA SCREW MACHINED SHEET METAL XFORMER A SHEET METAL XFORMER ASSY SUPPORT TRANSFORMER MTG CABLE POWER SWITCH SHIELD TRANSFORMER BASE SHIELD PWR TR
43. resetting the high voltage supply switches and signaling the processor via HVCLR Transistor Q310 monitors the presence of the 15V supplies If either of these supplies fail the high voltage supplies are switched off System Supply Section 4 20 The digital relay power supply tap 5V is routed via J350 through RT350 and bridge rectifier CR351 A positive temperature coefficient thermistor protects the instrument from the secondary supply short circuits This prevents them from thermally stressing the power transformer Three terminal regulator U350 regulates the digital relay supply with 1 initial tolerance and about 2 accuracy over temperature Capacitor C350 filters the input of U350 C351 filters the output The 5V digital supply powers both logic and relays The power for each routes away from the 5V regulator separately via lines 5V and 5VK This prevents relay drive currents from causing drops in the logic supply voltage Because the 20V supplies draw little current they can share power transformer secondary windings with the 15V supply with little efficiency lost This center tapped winding is brought to the Power Supply assembly via J350 where each half of the winding is protected from short circuits by a thermistor Bridge rectifier CR355 as well as filter capacitors C353 and C356 again serve both supplies The center tap of this transformer winding forms VCOM to which PACOM and HVCOM are tied to provide a common referenc
44. self tests is run A brief description of each test follows a 5725 ACV Sense Amp Checks for proper operation of the high voltage sense amplifier on the High Voltage Sense Assembly A6 5725 ACV Standby Puts the 5725A into voltage standby mode and causes the analog monitor circuit on the High Voltage Sense Assembly A6 to cycle through the continuous tests it does during normal operation 5725A ACV Operate Puts the 5725A into voltage operate mode but disconnects the output from the 5700A binding posts This test makes sure that the High Voltage Amplifier A3 works correctly and checks the analog monitor circuit on the High Voltage Sense Assembly A6 for correct operation 5725A Cal Sensor Verifies that the calibration circuitry on the High Voltage Sense Assembly A6 is working correctly This completes voltage function testing If any of the self tests fail a fault code and message is displayed 7 3 5725A Instruction Manual Table 7 1 5725A Fault Codes FAULT NO 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 MESSAGE 5725 Self Test ROM Failure 5725 Self Test RAM Failure 5725 Self Test EEPROM Failure 5725 Self Test Data Bus Failure 5725 Self Test CLAMPS Circuit Failure 5725 Self Test HVCLR Circuit Failure 5725 Self Test DAC Failure 5725 Self Test Watchdog Timer Failure 5725 Current Heats
45. that safety is maximized when they are open The remaining half of 0159 signals to the 5700A when the 5725A is powered up The 5725 5V supply powers the LED of the optoisolator whose output pulls B CINT pin 21 of J101 toward the 5700A supply common B 5VCOM This system is a complement to the CABLEOFF signal provided to the 5725A processor Analog Input Switching Section 4 58 The analog input switching section is the primary analog interface with the 5700A output functions Relay K108 serves exclusively to connect the output low lead of the 5725A to the load Relay K106 does the same for the low sense line Line MCOM when switched to B SENSE LO serves as the low sense lead for the 5725A Similarly PACOM which ties to the 5725A system ground VCOM at the power supply is switched to serving as the 5725A output low lead Signal BOOST IN is the input high lead from the 5700A signal sources and is switched from the inputs to the High Voltage Amplifier or Current Amplifier and sense amplifier by K107 Relay also selects the proper source for the B FEEDBACK signal Signal corresponds to the input high sense lead Relay K111 provides the capability to provide local sensing directly by the 5700A on the 5725A High Voltage Sense assembly Local sensing is used during ac voltage standby mode This prevents the 5700A Oscillator from running without feedback when the 5725A High Voltage Amplifier assembly
46. 10 A voltage proportional to the temperature rise from the heat sink to the junction of the transistor is added to HV TEMP M through R610 This is done via 400V IM from the Power Supply assembly Resistor R610 is selected to properly scale this contribution to the 10 mV C output of U603B Capacitor C610 provides averaging for the ripple on the current sensing resistor and CR604 prevents C610 an electrolytic capacitor from being reverse charged High Voltage Sense Assembly A6 4 54 4 30 In addition to ac voltage sensing for which it is named the High Voltage Sense assembly provides four major functions for the 5725A These additional functions are the following e Analog monitoring of the 5725A status e Interface with the 57004 controller e Switching input signals from the 57004 e AC Line Power switching Because it performs all the above functions the High Voltage Sense assembly plays a primary role in controlling the instrument attaining ac voltage specifications performing 5725A calibration and maintaining instrument safety The High Voltage Sense assembly has the following six sections sense amplifier analog monitor serial interface guard crossing analog input switching control and mains switching Each section is first briefly described then described in detail For reference see Figure 4 5 the block diagram for the High Voltage Sense assembly e Sense Amplifier Section The sense amplifier section
47. 125W 100PP RES MF 24 9K 1 0 125W 100PP RES MF 44 2K 1 0 125W 25PPM THERMISTOR DISC 4 85 25C JUMPER WIRE NONINSUL 0 200C TR C OP AMP PRECISION LOW NOISE C OP AMP PRECISION LOW NOISE C OP AMP CURRENT AMP TO 99 CA C OP AMP DUAL PRECISION MATCH C VOLT REG ADJ 1 2 TO 37 C VOLT REG ADJ NEG 1 2VT0 37 C COMPARATOR DUAL LO PWR 8 PI C OP AMP PRECISION LOW NOISE C BIMOS 8 CHNL HI VOLT DRVR W C COMPARATOR QUAD 14 PIN DIP C OP AMP QUAD JFET INPUT 14 P ZENER UNCOMP 6 8V 5 20 0MA 0 HARNESS MFC CURRENT RNET MF HERM SIP 5700 LO V INS Fluke Stock No 235226 235226 348920 289975 168260 168260 342634 268797 177147 348821 348821 343442 343426 842877 221663 291369 706317 838102 816090 816090 866637 816744 260422 782375 460410 707661 478354 782920 782912 387233 483438 260695 843008 809418 Tot Qty Notes List of Replaceable Parts 8 1020 n sozi 021 Y VENT E 2 gt z sogas 022 51481 21441 5 2528 2g 1029 02 2928 15284 20241 5628 9528 1120 2029 vegu E 01 zeza vigu 1 6528 020 6120 6 2 1528 2020 10241 3 0222 8524 0122 _ 8020 rm vozu veza 6022 1044 48411020 8629 2 fezd 142 9924 sez L 2928 1020 veg
48. 14 16 2 3 5 190k 11 13 14 16 2 3 5 1M 16 18 20 23 25 5 1 9M 17 19 21 24 3 5 6 10M 33 37 40 46 10 14 19M 43 47 50 55 20 24 100M 110 120 125 130 50 60 Secondary Performance Specifications and Operating Characteristics Included in Uncertainty Specifications Temperature Two Wire Adder Coefficient Full Maximum active 3 Note 2 Spec Difference compensation Nominal Stability Load Maximum of Note 4 Value 1 02 10 Characterized Lead 24 Hours 102 40 Note 3 Current to Nominal Resistance 40 50 Value 019 10 Q imo 0 8 500 500 2 4 1 32 4 5 8 100 700 500 2 4 1 9 25 6 7 8 100 500 500 2 4 10 5 2 3 8 11 220 300 2 4 19 4 2 3 8 11 160 300 2 4 100 2 2 3 8 11 70 150 2 4 190 2 2 3 8 11 50 150 2 4 1k 2 2 3 1 2 22 150 10 15 1 9k 2 2 3 1 1 5 16 150 10 15 10k 2 2 3 100 500 uA 7 150 50 60 19k 2 2 3 50 250 5 150 100 120 100k 2 2 3 10 100 pA 1 150 190k 2 2 3 5 50 500 pA 150 1M 2 5 2 5 6 5 20 100 200 1 9M 3 5 3 10 2 5 10 50 pA 200 10M 10 5 20 5 2 uA 10 pA 300 19M 20 8 40 25 1 5 300 100M 50 12 100 50 200 nA 1 500 Notes 1 Specifications apply to displayed value 4 wire connections except 100 2 Temperature coefficient is an adder to uncertainty specifications that does not
49. 1582 10511 bl3_NMIw CABLEOFF BREAK lt 815 814 C531 L 50 1K 74HC BD E 180pF ee 1 50 8 m 9 098 XTPL 507 80 8 oo 2581 DCOM 4 9152 MHZ 14 251 01 11 002 16 TK POWER UP AND RESET CIRCUITRY p EIS nur 83 2 92 02 Le I 2 TIME CONSTANT 15 138 mSEC SEES 15pF 15pF DNE C517 3 mS ONE SHOT 5VD 7 as 05115 085 u 86 2 las 16 006 87 i a 07117 087 3uF 2581 DCOM 2 249002 141502 74HCT04 RB ag RESET 2 iis 34 uses 10 1 gt 2 22 POWER SUPPLY 5VD GND R18 RESINA Ei 0582 74 4 74HC OB eee 20 OF 74HCT373 28 1 10 R WRe 5 6 4 EEROMSEL 18 cg 24 0502 74 04 14 7 5 5 21d WEN OZ N C 583 74HCT244 20 1 190 19 C581 1502 R510 fSVD 2K X 8 EERO lt gt 1504 HM6116P 24 12 DCOM CR509 pe 5 9 18K 9 8 SWITCH 1585 74 02 14 7 5 1 FROM 0508 PIN S DCUM 1 DC M 1506 74HC4020 16 8 IS SELELECTED BY 1507 33 1 42 R15 R14 813 WR WATCHDOG TIMER R518 7 308 mS TIMEOUT TOA BSR fr swsg2 1 DCOM DCOM 0509 4538 5 16 8 12 510 0510 74HC373 20 1 10 0515 0511 0514 74 14 7 vai 5725A 1051 J 10512 2816 24 12 1 7501 1
50. 1K HVCOMM HVCOMM 5725A 1061 1 of 2 5 4 3 2 1 Figure 9 3 High Voltage Amplifier PCA cont 9 11 5725A Instruction Manual I SV DORMANT _________________ ____ 488 N CHANNEL HV HEATSINK ASSY 1 1 450 ACV STBY 430V OPER L cesi HEATSINK gc pesil 1 1 VR6S 1 C652 R652 0651 52 1 661 661 1 RED pest 15v 10K KEY 2 19658 3 bey 4 6652 _5 D CR652 R654 C653 HERTSINK 1 6551 5 1 144007 Rese 7 653 188 8 D 2 5 L 1 26 C bg ie 202V ACV STBY N CHANNEL HV HEATSINK ASSY 2 iNSETB 208 OPER 1 564 662 1 wHT RED 4 2 2 KEY 0654 E 4 D D 2 5 C654 S656 5 22pF 6655 6 5655 7 E CRES4 19 2 1ggk R662 2 R663 5656 8 1N4007 R664 2 50 5 MTM2NSQ 5 188 188 4 7K 4 651 Reo 1N4448 1 1 C655 666 667 L C656 0657 9 3 9
51. 3 2 Front Panel Features nete rt 3 3 Rear Panel Features peter 3 4 Turning on the 5725A AmplifieT 3 5 3 6 5725A Operating Functions and Modes 3 7 3 8 Voltage stet antl 3 9 Current Standby eene tetto tegeret 3 10 Voltage Operated esteem dp Eee et 3 11 Current Opera 3 12 Conditions That Activate the 5725 i 5725A Instruction Manual Theory erret tnnt a iuum sino enn 4 e 4 2 Overall Functional 4 3 1100 AC Range Functional Description 4 4 Range Functional DescTriptigon 4 5 Operation in the DC 4 6 Operation in the AC 4 7 Voltage and Current Standby Modes 4 8 Voltage eee Eee edet rina erede 4 9 Current Standby u acd 4 10 How the 5700A and 5725A Communicate 22 4 11 Description of the Out Guard Lines 5725A Side 4 12 Description of the In Guard Lines 4 13 Functional Summaries by
52. 4 40 High Voltage Amplifier 4 41 Input d ees beet 4 42 WN u 4 43 Window Comparator 4 44 Input Clamp tende rnt ien 4 45 Transconductance and Cascode Stage 4 46 Mista Ge huqkunawan ayda 4 47 Midstage 400V Filter 22 4 48 High Voltage Heat Sink Assemblies 4 49 Autobias Current Source 4 50 Autobias Sense Circuit pt 4 51 High Voltage Amplifier Feedback 4 52 Signal Transformers 4 53 Temperature Monitoring il Index Contents continued 4 54 High Voltage Sense Assembly 6 4 55 Sense Amplifier Section 4 56 Analog Monitor Section 4 57 Serial Interface Guard Crossing Section 4 58 Analog Input Switching 4 59 Control at een tr 4 60 AC Line Voltage Selection Section Calibration and Verification 5 1 Trnitod Ctiom u 5 2 to Find Further PD 6 1 lingerie 6 2 Repl
53. 656 R654 R655 T 1659 E el R665 2 2 R652 5 651 e LT R653 i ba n VR651 ES 2 x 8 R651 28 5 2 5725A 1661 aq38f eps Figure 8 4 A3 High Voltage Amplifier PCA 8 23 5725A Instruction Manual 8 24 Table 8 5 A4 Power Supply PCA Reference Designator C301 C302 C321 C322 C303 C304 C308 C317 319 C352 C355 C358 C360 C362 C305 C306 C307 C309 C310 C311 C313 C320 C312 C363 C314 C315 C316 C350 C351 C354 C357 C359 C361 C353 C356 C369 C364 368 CR301 304 CR310 313 CR305 309 CR316 CR321 CR314 CR315 CR319 CR320 CR322 325 CR350 CR352 354 CR356 363 CR317 CR318 CR351 CR355 E301 E302 F301 F302 H301 H302 H303 H307 J301 J303 9302 9350 9351 28 81 82 MP301 MP305 Description CAP AL 220UF 20 350V CAP POLYES 0 1UF 10 50V CAP AL 0 47UF 20 50V CAP POLYES 0 047UF 10 50V CAP CER 82PF 2 50V COG CAP CER 0 04UF 20 3000V Y5V CAP CER 33PF 5 50V COG CAP POLYES 0 47UF 10 50V CAP POLYES 0 01UF 10 50V CAP AL 10000UF 20 25V CAP AL 10UF 20 63V SOLV PRO CAP AL 3300UF 20 50V CAP POLYES 0 33UF 10 50V DIODE SI 1K PIV 1 0 DIODE SI BV 75V lIO 150MA 500MW 1 400 PIV 1 LED RED T1 40 MCD DIODE SI RECT BRIDGE BV 50V IO HEADER 1 ROW 100CTR 4 PIN SURGE PROTECTOR 630V 15 FUSE 406X1 375 2A 600
54. HV RMPLIFIER La R162 10K DCOM DCOM R167 1 5K MFPD HV AMPLIFIER HVCLR 105 109 COIL 184 COIL K103 COIL 182 COIL CLAMPD HVSUPPLY 5 0588 1 HVSENSE SEL 2 PG1B21 4 393 1 9 luF 28V d R174 6 U150B 102K 7 5 N C LM393 5 CABLEOFF OUT GURRD DIGITRL 5 CAL ENABLE NORMAL SWITCH SHOWN IN NORMAL POSITION 5 3 4 1 6 C158 327 5 5 INTERFACE CONN FROM 2481 1 EARTH x B SVCOM TP159 TP157 4 5 R173 3 9K NM DCOM TO HV AMPLIFIER CLRMPD TO POWER SUPPLY DIGITAL HVSUPPLYw CRL ENRBLE 2730 TRANSMIT FROM DIGITAL RECEIVE 0 DIGITAL CRBLEOFF DIGITRL INTERCONNECT INTERCONNECT HV SENSE DC GRIN MONITOR DRC RNRLOG MONITOR MFC FRC RC RC CAL SHUNT 1 38 CURRENT RMP ZERO CURRENT RMP GRIN 5725A 1001 3 of 4 Figure 9 6 A6 High Voltage Sense PCA cont 9 21 5725A nstruction Manual 0104 CR403 0481 1 4887 SWITCH CONFIGURATION C482 LINE VOLTAGE PWR ON OFF 1 N c L t L R R R R rras rras 5403 245404 a 2 PULL PIN 11 OF 7482 FOR KEYING CONNECTOR TO
55. Monitor Faults FAULT NO MESSAGE 209 5725 Current Heatsink Too Hot 210 Output Tripped To Standby 211 5725 Current Compliance Voltage Too High 212 5725 Current Compliance Voltage Too High 213 5725 400V Supply Did Not Shut Off 214 5725 400V Supply Did Not Shut Off 215 5725 Voltage Heatsink Too Hot 216 Output Tripped To Standby 217 5725 400V Supply Too Low 218 5725 400V Supply Too High 219 5725 400V Supply Too Negative 220 5725 400V Supply Too Positive 221 5725 400V Supply Current Too High 222 Output Tripped To Standby 223 5725 400V Supply Current Too High 224 Output Tripped To Standby 225 5725 Fan Not Working a With an oscilloscope check TP152 DAC OUT for the waveform shown facing Section 9 with the High Voltage Sense Assembly A6 schematic b Ifthe waveform is present suspect an abnormal analog input into U151 on the High Voltage Sense Assembly A6 See Table 4 3 for voltage limits of the analog inputs for standby operation c Ifthe waveform is not present short TP510 to DCOM on the Digital assembly This tells the CPU to ignore all analog monitor faults and run all other tests Check for any new fault codes that indicate the problem d Ifthe waveform is still not present the High Voltage Sense Assembly A6 is likely to be at fault specifically the circuitry that includes U151 U155 U156 0153 0154 2 Ifnot an analog monitor fau
56. Notes Turning on the 5725A Amplifier Table 3 2 Rear Panel Features CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for rear output You can set the 5700A to source all its unamplified as well as amplified current through these binding posts The LO binding post is isolated from ground when in the current function and is open circuited at other times Cable and connection recommendations are made in Section 4 of the 5700A Operator Manual CALIBRATION Switch A slide switch that enables and disables writing to the nonvolatile memory that stores 5725A calibration constants Switching to ENABLE allows writing to the memory and switching to NORMAL protects data in memory from being overwritten The switch must be in the ENABLE position to store corrections generated during calibration The switch is recessed to allow metrologist to cover it with a calibration seal to guarantee calibrator integrity 5700A CALIBRATOR Connector Provides the analog and digital interface to the 5700A Calibrator After connecting to the 5700A you control the 5725A from the 5700A front panel or by sending remote commands to the 5700A Refer to Using an Auxiliary Amplifier in Section 4 or for remote operation to Section 5 of the 5700A Operator Manual for details Fan Filter Covers the air intake to keep dust and debris out of the instrument The fan directs a constant cooling air flow throughout the chassis
57. PG1C1 HICOM PG3D4 R272 205 ISENSE LO 1 RED WIRE mE PG1D8 POWER UP DORMANT ISENSE HI 2 BLK WIRE ALL RC VOLTAGE MODES PG1C8 DC CURRENT amp CURRENT STANDBY DC CURRENT OPERATE ICRL IFB RC CURRENT OPERRTE ICRL VINI MCOMI 2 08 PG2 C8 PG2 C8 203 0204 5700 CURRENT STANDBY 5700 CURRENT OPERATE 7203 SHUNT ZERO CAL ICOM ICOM3 SHUNT 1 38 CAL 255 6 CURRENT AMP ZERO CAL E 7 CURRENT RMP GRIN CRL ENERGIZED FOR RELRYS RND ON FOR FETS R 3252 B CURRENT _ 3TURN GRO CALIBRATION SY gt 5725A 102 RSS Y 1021 AMPL IF IER B IRTN 2 of 3 8 7 6 20 sss 4 2 1 9 8 Figure 9 2 A2 Current Amplifier PCA cont Schematic Diagrams 206 w MP816 HIGH CURRENT SUPPLIES 20V PG1 01 4 C218 C220 5 S 20 uF 28V HICOM PG2B8 4 C218 C221 1 S 00uF 5agggur CR211 134904 H 20V 20v 508 121 eee ane EE 20V SUPPLIES CR288 209 144004 425 9V 201 201 TO PG 1 210 R247 144004 1232 222 2747 QuF 226 35v C224 3 48K ICOM I PG 27 R258 C225 3 48K 1BuF ICOM C223 C227 7006 1BuF R248 210 CR209 144004 232 201 TO PG 1 2 1 1 FRONT 8201 0202 FRONT 0211 0212 0214 02
58. PWR AC LINE FILTER T f i 222 492 PRIMARIES FL1 TO ERRTH GROUND LUG ON CHRSSIS SHIELDS TO RV151 PG3R8 TO 108 PG187 RERR PRNEL map ON PWB RSS Y 5725A 1001 4 of 4 Figure 9 6 A6 High Voltage Sense PCA cont 9 22 Schematic Diagrams 73 P5604 5725A 4201 aq45f eps Figure 9 7 A12 Transformer Enclosure Assembly 9 23 5725A Instruction Manual 9 24 5 5700A CALIBRATOR connector 2 6 3 7 Connecting to 5725A STANDBY indicator 3 3 5 A See Interconnect assembly A2 See Current Amplifier assembly See High Voltage Amplifier assembly 4 See Power Supply assembly AS See Digital assembly See High Voltage Sense assembly AC current See current AC line power 2 7 AC voltage See voltage Access procedures 6 6 Air filter Current a assem Digital assembly 5 Fuse main 2 8 High Voltage Amplifier assembly 6 12 High voltage output transistors 6 14 High Voltage Sense assembl 6 13 Initial access procedure Interconnect assembly A1 6 14 Power Supply assembly A4 6 9 Activating 5725A output 3 12 3 13 3 Analog monitor on High Voltage S assembly faults 7 7 Assembly location internal Autobias sense circuit 4 28 High voltage amplifier feedback 4 29 High voltage heat sink assemblies 4 27
59. R211 234 0207 R282 C236 R233 TP211 R255 C213 R293 TT T RT RT 201 202 C238 C237 TP 15 CR207 C203 234 8264 203 R240 782653 210 R258 R243 TP207 U202 R257 Bar R281 R259 8274 5282 R284 6202 E R256 R235 TP202 R251 R262 C201 R252 C230 0201 205 n TP212 P213 16 209 TP298 1 L f JN L201 0208 7203 52 5725 1650 Figure 9 2 2 Current Amplifier 9 6 Schematic Diagrams 8 7 5 5 4 3 2 1 OUTLINED COMPONENTS ARE MOUNTED TO HEATSINK ASSEMBLY 201 VOLTAGES IN BOXES ARE TYPICAL VOLTAGES IN THE CURRENT STANDBY OR DORMANT CONDITION R237 TEST INPUT 1 TEST OUTPUT 1 TEST INPUT 2 15V 15V 2K 15 D TP201 TP202 203 TP212 TP213 205 D R285 dn 121 T 12k PG1C3 I 1 0 C293 i 1uF 15 R225 R239 R248 VCOM TICOM S1 5 ISENSE LD 39 2K 39 2K INNER LOOP PG2B8 15V ERROR R227 AMPLIFIER EE VCOM 1 8 201 2242 P NEN IN 3 4 OUTER LO
60. TO HIGH VOLTAGE TEV POWER AMP ASSEMBLY HVSTROBE 82pF CR386 PG2A3 144448 0308 TP301 FILTER PG1D5 243905 B rds om TP302 49BY 103 B3 4 303 400 PG1R2 144448 304 FILTER PGiAS 5V TP3 5 HV INH PGICS CR307 TP306 HV CLR PG1C7 1N4448 C318 R332 12387 HVCOM PG1C4 B 1006 TP35 5V PG2D4 L TP351 DCOM PG2D4 0310 R324 L 400 MON TP352 15V PG2C5 PG283 TP353 UNREG 62 6 354 15V PG2C4 246520 TP355 UNREG PG2C7 57 PG2C4 15 39 0316 R346 CR319 2 8520 1 5 1 490048 TP358 VCOM PG2C4 48BV 1 si PG2B3 C314 0311 TP359 20V PG2B4 2 6520 2 PG2R4 4 VEBM CR324 144004 CR325 Caii 144067 1N4207 14004 DORMANT TO TRANSFORMER 4 CR310 CR311 aS R360 2 R347 d 450 STBY amp OPER 5 1 5M 4B8V OPERATION 1N4448 10 188 100 R359 CR3g9 0319 R341 032815 33K CR31 5 5 5 TO TRANSFORMER 194007 8348 15V 2450 0312 03135 2458 ees A 33K SQV OPERATION 1 955 MP319 MP 328 FUSE CLIPS B 2158 2458 303 304 307 MP3D8 5725A 1031 9383 R342 R343 1 of 2 470K 478K 22257 DORMANT lzasey acy amp HVCOM 7 6 5 4 2 1 9 14 Figure 9 4 A4 Power Supply PCA cont Schematic Diagrams 9 8 5 4 3 d 2 1
61. To The High Voltage Amplifier assembly lays flat on the top of the instrument toward the front On page 6 13 paragraph 6 12 make the following changes Change The High Voltage Sense assembly lays flat on the top of the instrument To The High Voltage Sense assembly lays flat on the bottom of the instrument Change step 2 to step 2a and add a new step 2 as follows 2 Follow the Current Amplifier Assembly A2 access procedure to gain access to the connectors on the High Voltage Sense Assembly A6 Remove the connectors and secure the Current Amplifier Assembly before proceeding 6 96 1
62. and the Y5735 Y5737 Instruction Sheet Section 2 of this manual Section 3 of this manual Sections 4 through 9 of this manual Section 3 of this manual and Section 4 of the 5700A Operator Manual Section 4 of the 5700A Operator Manual Section 7 of the 5700A Operator Manual Section 3 of the 5700A Service Manual Section 5 of the 5700A Operator Manual Section 1 of this manual Section 4 and 9 of this manual Section 6 of this manual Section 8 of this manual Introduction and Specifications 1 How to Use the Manuals How to Use the Manuals 1 3 The following paragraphs describe how each manual addresses the 5725A 5725A Instruction Manual 1 4 Use the 5725A Instruction Manual for installing the 5725A learning about its front and rear panel features and for all service related topics such as maintenance troubleshooting parts lists and schematics The 5725A Instruction Manual is the service and operator manual for the 5725A Although the instruction manual also contains a section devoted to 5725A operating notes once the 5725A is up and running you will find that the 5700A Operator Manual contains most of the information you need to operate the 5725A 5700A Operator Manual 1 5 The 5700A Operator Manual contains the following information pertaining to the 5725 e Specifications for both the 5700A and 5725 these same specifications are in this Instruction Manual e Cable connections to a UUT for amplified voltage a
63. consists of a precision ac amplifier configured as an active attenuator a buffer amplifier that isolates the 5725A high quality ground from the 5700A ground reference and a precision true rms converter circuit for 5725A calibration Together these circuits accurately attenuate the output of the 5725A in ac voltage function to drive the 5700A Oscillator control circuitry The sense amplifier section is essentially a gain determining feedback element of a loop whose forward path consists of the 5700A Oscillator and the High Voltage Amplifier assembly e Analog Monitor Section The analog monitor section is comprised of a bipolar output dac a comparator and a 16 channel multiplexer The inputs to the multiplexer are scaled voltages representing critical parameters in the other 5725A assemblies particularly those involving high voltage and or current Each input can be compared to programmed limits set by the dac under microprocessor control The comparator gives simple go no go decisions which are then acted on in a more sophisticated way by the software An additional function of the analog monitor section is to provide access to the B RCL line used by the 5700A during 5725A calibration 4 Theory of Operation Detailed Circuit Description 41105515 OL 3SN3SAH IN NOLS 182 4102512 04 27 8118 89 Snc i
64. contain a Nickel Cadmium battery Do not mix with the sold waste stream Spent batteries should be disposed of by a qualified recycler or hazardous materials handler Contact your authorized Fluke service center for recycling information Manual Status Information Assembly Name Fluke Part No icon A1 Interconnect PCA 843065 F A2 Current Amplifier PCA 843073 L High Voltage Amplifier PCA 843086 J A4 Power Supply PCA 843078 F A5 Digital PCA 843081 D A6 High Voltage Sense PCA 843060 N A30 Inductor PCA 860119 A Table 8 1 Final Assembly Reference Description Fluke Stock Tot Qty Notes Designator No 1 INTERCONNECT 843065 1 A2 CURRENT AMPLIFIER PCA 843073 1 HIGH VOLTAGE AMPLIFIER PCA 843086 1 A4 SUPPLY PCA 843078 1 5 DIGITAL 843081 1 HIGH VOLTAGE SENSE 843060 1 12 TRANSFORMER ENCLOSURE ASSEMBLY 842984 1 A30 INDUCTOR PCA 890116 1 F501 FUSE 25X1 25 8A 250V FAST 561506 1 F502 FUSE 25X1 25 4A 250V FAST 216846 1 H1 SCREW PH P SEMS STL 6 32 375 177022 22 H30 SCREW PH P LOCK STL 6 32 500 152173 8 H301 SCREW PH P LOCK MAG 6 32 2 772236 30 H302 WASHER FLAT BRASS 8 0 032 THK 631606 4 H304 NUT 8 LOW THERMAL 850334 8 H308 WASHER FLAT COPPER 8 020 721688 4 H331 SCREW CAP SCKT SS 8 32 375 295105 24 H424 SCREW PH P LOCK SS 6 32 375 334458 2 H425 SCREW FHU P LOCK SS 6 32 250 320093 12 8 4 Table 8 1 Final Assembly cont
65. front panel Proceed as follows to access the Digital Assembly 1 Perform the Initial Access Procedure 2 Refer to Figure 6 5 for accessing the Digital assembly Remove the six Allen head screws from the sides of the front handles and remove the three screws from the front edge of the bottom cover You have already removed the top cover in step 1 3 The front panel remains connected by the Digital assembly ribbon cable and the current output cable Remove the screw in the center of the Digital assembly to free the 6 9 5725A Instruction Manual CAUTION WHEN REINSTALLING DIGITAL ASSEMBLY PULL RIBBON CABLE SLACK COMPLETELY INTO CHASSIS aqi7f eps Figure 6 5 Accessing the Digital Assembly 4 Maintenance 6 Access Procedures If you want to completely remove the Digital assembly remove the ribbon cable by releasing the catches on the board mounted connector Caution When replacing the Digital assembly make sure the ribbon cable is pulled fully into the 5725A chassis Be sure to leave no fold trapped between the back of the pca and the metal panel or else shorting to the component leads can occur Accessing the Current Amplifier Assembly A2 6 10 Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply This assembly drops into
66. of the 5700A Calibrator to 11A dc ac 5700A drives the Current Amplifier assembly input through the 5725A interface cable There are no user input terminals Output current is available at binding posts on the 5725A front or rear panel Selection of front or rear 5725A binding posts is done by unplugging one cable and plugging in another cable on the Current Amplifier assembly inside the 5725A chassis Additionally relays on the Current Amplifier assembly can route the 5700A current source to the 5725A output terminals if so selected at the 5700A front panel or by remote command The Current Amplifier assembly has five distinct sections the error amplifier output control monitor and power supply Each section is first briefly described then described in detail in the following paragraphs Refer to Figure 4 3 a block diagram of the Current Amplifier assembly to see the interrelationship of the following function blocks 4 19 5725A Instruction Manual A 2424 ANNHS IN34400 7770000 eee 121 11012313 WIdWOII WdW31l TWOJW INIA aq20f eps Figure 4 3 Current Amplifier Assembly Block Diagram 4 20 Theory of Operation 4 Detailed Circuit Description e Error Amplifier Section The error amplifier section contains three differential amplifiers and a precision high current shunt resistor Two differential amplifiers set the gain and uncorrected frequency respons
67. pairs R301 R302 and R342 R343 equalize the voltage across the transistors in their off state Series transistors guarantee operation within the MOSFET 500V absolute rating The MOSFET switches are controlled by the signal at TP305 When this point is at 5V the series connected base emitter junctions of Q305 Q307 and Q304 Q306 are zero biased In this condition only leakage current flows through Q305 Q307 and Q304 Q306 which is insufficient to develop enough source gate voltage to turn on 0301 0317 0302 0318 0312 0319 Q313 Q320 When 305 is taken low the series base emitter junctions are now forward biased sufficiently so that the Q305 Q307 and Q304 Q306 pairs conduct with about 0 5 mA collector current This current flows through the source gate resistor and zener diode bias networks of Q301 Q317 Q302 Q318 Q312 Q319 and Q313 Q320 The zener diodes limit the source gate voltage to near 15V which is enough to turn on the MOSFETs completely without exceeding their source gate voltage ratings Transistors Q303 Q321 Q311 Q323 Q315 Q322 and Q316 Q324 are emitter followers that prevent Q305 and Q307 from experiencing excessive collector emitter voltages in their off state The networks of resistors capacitors and diodes formed by R344 C305 CR305 R327 C304 CR316 and R345 C306 CR309 are included to slow supply turn on to prevent a transient current limiting condition while still allowing rapid supply turn off Resistors R310 R
68. press the Current softkey A sequence of self tests is run A brief description of each test follows a 5725A Current Shunt Checks the current cabling and the calibration amplifier on the Current Amplifier assembly A2 b 5725A Current Zero Grounds the input and shorts the output of the Current Amplifier and verifies that the output is close to 5725A Current Gain Shorts the output of the Current Amplifier applies a voltage input and verifies the output current This confirms integrity of the error amplifier circuit in the Current Amplifier assembly d 5725A Current Monitor Runs the analog monitor circuit on the High Voltage Sense Assembly A6 in the current function and verifies that it operates correctly 7 5 5725A Instruction Manual Manual Tests for Fault Isolation 7 4 Warning The following servicing is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you are qualified to do so Follow the access procedures and warnings in section 6 to open the 5725A covers The voltage output transistor heat sinks are at lethal voltage potential in ac v standby and ac v operate modes during normal operation and possibly in any other mode after a failure The heat sinks are exposed when any assembly is in the service position and when the heat sink cover is removed Use only non conductive tools and keep one hand behind your back to avoid making a circui
69. ranges 20 mA for 1100V range 500 output impedance on 220 mV range all ranges 1000 gt 250 Load regulation 0 2 ppm 0 2 uV change full load to no load Line regulation lt 0 1 ppm change 10 of selected nominal line Settling time 3 seconds to full accuracy 1 second for range or polarity change 1 second for 1100V range Overshoot lt 5 Common mode rejection 140 dB DC to 400 Hz Remote sensing Available to 1100V 2 2V through 1100V ranges 1 1 7 5725A Instruction Manual 1 8 AC Voltage Absolute Uncertainty Relative Uncertainty Resolution Frequency 5 from calibration temperature 1 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ppm output ppm output uV 10 20 500 5 550 5 600 5 600 5 500 5 550 5 20 40 200 5 220 5 230 5 240 5 200 5 22045 22mV 1nV 40 20k 100 5 11045 120 5 120 5 60 5 65 5 20k 50k 340 5 37045 390 5 410 5 100 5 110 5 50k 100k 800 8 900 8 950 8 950 8 220 8 240 8 100k 300k 11 15 12 15 13 15 13 15 400 15 440 15 300k 500k 15 30 17 30 17 30 18 30 10 30 11 30 500k 1M 4 40 44 4 47 40 48 40 3 30 33 30 10 20 500 6 550 6 600 6 600 6 500 6 550 6 20 40 200 6 220 6 230 6 240 6 200 6 220 6 22 mV 10 nV 40 20k 100 6 110 6 120 6 120 6 60 6 65 6 20k 50k 340 6 370 6 390 6 410 6 100 6 110 6 50k 1
70. simply a contact closure that indicates to the processor whether 5725A calibration is enabled Theory of Operation 4 Detailed Circuit Description AC Line Voltage Selection Section 4 60 In addition to the primary power switch S401 this section contains three line voltage selection switches 5402 through 5404 These three switches allow the 5725A to be set to eight nominal ac line voltage levels each with a 10 tolerance Thermistors RT401 and RT402 have negative temperature coefficients and limit inrush current at power up Relay K401 provides a pair of shunt switches to bypass thermistors after about a half second This allows greater efficiency than with thermistors alone and the use of thermistors allows operation if the relay fails CR401 through CR404 and C401 form an unregulated power supply that is not isolated from ac line power for controlling K401 R401 R402 and C402 provide a time delay that prevents Q401 and hence K401 from switching before the effective power supply capacitance is sufficiently charged Metal Oxide Varistor RV401 prevents high voltage transients on the ac line from reaching the transformer by clamping voltages above 275V ac 4 37 5725A Instruction Manual 4 38 Chapter 5 Calibration and Verification Title Page 5 1 5 2 Where to Find Further Information aaa 5 1 5725A Instruction Manual 5 2 Calibration and V
71. switching section behaves like an electronic DPST switch which by command of the microprocessor or the current limit section shuts down the high voltage supplies Microprocessor control alone can turn on the high voltage supplies in normal operation At the board level manual control of the switch is possible to enable stand alone turn on of the Power Supply assembly A4 and the High Voltage Amplifier assembly A3 e Current Limit Section The current limit section shuts down the high voltage supply in a latching mode if excessive current is drawn by the High Voltage Amplifier or if the 15 or 5V supplies fail This section of the Power Supply assembly consists of a pair of shunts a pair of comparators and a system supply monitor e System Supply Section The system supply section contains various regulated power supplies and is comprised of five linear regulators In addition the system supply section contains an unregulated supply for the fan Theory of Operation 4 Detailed Circuit Description High Voltage Supply Section 4 17 REF DES F301 F302 F201 F202 The high voltage supply allows normal operation from a pair of nominal 400V dc supplies or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies Switching between normal and reduced voltage operation is done by removing the plug from J301 and inserting it into J303 See Section 7 for the procedure to do this Plug P301 is wired
72. the output of the input amplifier U602 The window is set to about 2 2V to 9V by R626 VR602 and R636 If the output of U602 exceeds the window limits the appropriate comparator turns on the clamp Q604 shorting the input to ground The comparator also pulls control line CLAMPS high via U604D where the comparator routes to the Digital Assembly A5 through the Interconnect assembly A1 Comparator U604D is a level shifter to translate the window comparator output to a TTL level Exceeding the limits of the window comparator is an indication that the loop is in an abnormal condition when the instrument is in the ac voltage standby or ac voltage operate states In current standby or current operate states the comparator causes CLAMPS to be asserted which turns off the 400V and 400V supplies Input Clamp 4 44 A FET clamp 0604 is turned on until the output of 0602 returns to the region within the window When this occurs the comparator turns off Q603 To avoid a large transient at the output of the High Voltage Amplifier assembly A6 the clamp must be turned off slowly Resistor R637 and C618 slow the clamp drive signal to accomplish this Though Q604 can be turned off slowly by removing its gate drive slowly it clamps asymmetrically in the transition region The body of the FET is held at 7 5V This keeps the FET from turning on at the negative peaks of the input waveform The asymmetrical clamping appears as dc shift in the wavef
73. voltage and current on the high voltage supplies as well as the heat sink temperatures and cable integrity It prevents the 5725A from switching to operate if a fault is present Current Standby 4 9 In current standby the binding posts are disconnected from the instrument circuitry but all 5725A 5700A connections are made as in the operate mode In dc current standby the 5700A DAC supplies a voltage that corresponds to the dc current selected In ac current standby 5725 relay settings are identical to those for dc current standby The 5700A Oscillator supplies an ac voltage level that corresponds to the selected output current and frequency 4 7 5725A Instruction Manual 4 8 How the 5700A and 5725A Communicate 4 10 The 5725A and 5700A maintain all analog and digital communication over an external cable connected to subminiature D type connectors on the back of each instrument All in guard analog signals except B VGRD connect to relays that isolate the 5725A 5700A whenever the 5725A is not in use Digital communication occurs over five out guard digital 5700A lines 5 B SCR B 5V B 5VCOM and B CINT The B 5V and B 5VCOM lines power the 5725A guard crossing and allow the 5725A to detect when the cable is disconnected Lines B SCT and B SCR provide serial communication of data over RS 232 type line Optoisolators on the 5725A maintain the integrity of the guard Line B CINT is a hardwire loop tha
74. with both 400V and 50V transformer taps so that the 400V taps are connected in the circuit when P301 is plugged into J301 and the 50 taps are connected in the circuit when P301 is plugged into J303 Two sets of high voltage rectifiers CR301 through CR304 and CR310 through CR313 form bridge rectifiers for the positive and negative supplies respectively The output from these bridges is filtered by C301 C321 and C320 C322 The capacitor pairs are configured in series to obtain the necessary working voltage Bleeder resistors R303 R314 R315 and R 308 discharge C301 C321 when power is removed and form a voltage divider that equalizes the voltage across halves of C301 Resistors R335 R337 R336 and R339 do the same function for 302 322 Warning Do not rely on the power supply LEDs as an indication of the presence of high voltage Always use a voltmeter to check for high voltage between TP307 and TP301 and between TP307 and TP304 Components CR317 and CR318 are high intensity red LEDs that provide visual indication of the presence of high voltage These LEDs have high luminosity at low current levels They are located in series with the bleeders for the positive and negative supplies using about 1 mA of current for bias Under average lighting conditions these LEDs are visibly lit with as little as 40 C301 C321 and C320 C322 Zeners VR306 and VR307 are normally off as their zener voltages are greater than the forward voltage
75. 00 500 650 500 700 500 450 500 500 500 5k 10k 15 1 uA 16 1 uA 17 1 uA 18 1 uA 14 1 15 1 10 20 650 500 700 500 750 500 800 500 450 500 500 500 20 40 350 400 380 400 410 400 420 400 270 400 300 400 22 100 nA 40 1k 120 400 140 400 150 400 160 400 110 400 120 400 1k 5k 500 5 600 5 650 5 700 5 pA 450 5 uA 500 5 yA 5 10 15 10 16 10 17 10 18 10 14 10 uA 15 10 uA Hz ppm output ppm output 10 20 650 5 700 5 75045 800 5 450 5 500 5 20 40 350 4 380 4 410 4 420 4 280 4 300 4 220 mA 1 uA 40 1k 120 4 150 4 170 4 180 4 110 4 130 4 1k 5k 500 50 600 50 650 50 700 50 450 50 500 50 5k 10k 1596 100 1696 100 17 100 18 100 14 100 15 100 20 1k 600 40 650 40 700 40 750 40 600 40 650 40 2 2A 10 1k 5k 700 100 750 100 800 100 850 100 650 100 750 100 5k 10k 80 200 90 200 95 200 1 0 200 75 200 85 200 5725A Amplifier HA 100 uA 40 1k 370 170 400 170 440 170 460 170 300 170 330 170 77 1k 5k 800 380 850 380 900 380 950 380 700 380 800 380 5k 10k 3 750 36 750 28 750 32 750 33 750 35 750 Introduction and Specifications Specifications AC Current continued Secondary Performance Specif
76. 00 FFFF Bit 0 of Port 7 RD is OUTPUT ENABLE 4 Theory of Operation Detailed Circuit Description 1050 5 031 5 1 81 X 13SWOH 508 1041402 0 00 41102413 43535 ONY Jn 33A04d 1051 YATIONLNOD 0521 9 9 100230 WON gt gt D e 5 e 1 i 1 D D D gt 5 5 5 to 5 E 3 100 000 5018 8190 5198 08 578 5534009 sasn 314 50Q0H31UA 1d 431N1 CLINYYSINID XA MddfiS AH CYOLINOW 90715NU 4 90 6 OL 11 5 9051 lt 4 900 6 aIWN u308 3A132334 33031882 aq19f eps Figure 4 2 Digital Assembly Block Diagram 4 17 5725A Instruction Manual EEROM 4 26 2Kb X 8 EEROM 0512 stores 5725A calibration constants plus the date and temperature of calibration If the rear panel CALIBRATION switch is in the NORMAL position the EEROM is software write disabled The 6303Y reads the CALIBRATION switch via bit 1 of port 5 and enables the EEROM when the switch is in the ENABLE position The EEROM is selected when A15 and A14 are low A13 is high 2000 through and either WR is TRUE Writing is controlled by bit 2 of port 7 and the RESET line The 5725A does not automatically for
77. 00k 800 8 900 8 950 8 950 8 220 8 240 8 100k 300k 11 15 12 15 13 15 13 15 400 15 440 15 300k 500k 15 30 17 30 17 30 18 30 10 30 11 30 500k 1M 4 40 44 4 47 40 48 40 3 30 33 30 10 20 500 16 550 16 600 16 600 16 500 16 550 16 20 40 200 10 220 10 230 10 240 10 200 10 220 10 220 mV 100 nV 40 20k 95 10 100 10 110 10 110 10 60 10 65 10 20k 50k 300 10 330 10 350 10 360 10 100 10 110 10 50k 100k 750 30 800 30 850 30 900 30 220 30 240 30 100k 300k 940 30 1 30 11 30 11 30 400 30 440 30 300k 500k 15 40 17 40 17 40 18 40 1 40 11 40 500k 1M 30 100 33 100 35 100 36 100 3 100 33 100 10 20 500 100 550 100 600 100 600 100 500 100 550 100 20 40 150 30 170 30 170 30 180 30 150 30 170 30 22V tuv 40 20k 70 7 75 7 80 7 85 7 40 7 45 7 20k 50k 120 20 130 20 140 20 140 20 100 20 110 20 50k 100k 230 80 250 80 270 80 280 80 200 80 220 80 100k 300k 400 150 440 150 470 150 480 150 400 150 440 150 300k 500k 10 400 11 400 12 400 12 400 1 400 11 400 500k 1M 20 1 mV 22 1 mV 23 1 mV 24 1 mV 2 1 mV 22 1 mV 10 20 500 1 mV 550 1 mV 600 1 mV 600 1 mV 500 1 mV 550 1 mV 20 40 150 300 170 300 170 300 180 300 150 300 170 300 22V 10 uV 40 20k 70 70 75 70 80 70 85 70 40 70 45
78. 12 Schematic Diagrams 40357 G 5 gt 0318 C358 TE I a lt lt HIGH _R358 _ 360_ 28957 VOLTAGE 2859 Rios 316954 R302 369 C356 C355 LU Led m CR357 CR353 CR356 R338 TP306 REV CR354 R348 CR308 VR351 REV P FD pg DA e R339 CR321 R349 843078 R314 R336 R315 R337 R327 SYSTEM r R354 R308 R335 CR316 5725A 3031 1A FILTER FILTER R316 MANUAL FF TP301 e 304 CR363 CR362 R355 e CR307 _ R356 POWER SUPPLY 5725 7631 C368 C366 C365 R334 R328 TP305 e nd T C314 TP357 ag59f eps 57254 1631 Figure 9 4 A4 Power Supply PCA 9 13 5725A Instruction Manual
79. 15 0213 D D C EV 0203 0205 203 FRONT 0206 o D 0204 BOTTOM VIEW of C UN FRONT FRONT BOTTOM VIEW 0207 0208 0216 205 M C LRST USED NDT USED R298 R254 R289 R229 R238 R236 R265 R266 C245 C209 C229 C231 32 C241 242 44 7203 0209 2109 CR222 4283 VR202 TP 286 0211 Ww2g1 82 F282 2202 RT282 Q216 TP215 K289 201 W285 5725 1021 3 of 3 Figure 9 2 A2 Current Amplifier PCA cont 9 9 5725A Instruction Manual 4 5 WARNING HIGH VOLTAGE N P 090 400 IM TL TP616 HVTEMP M 1090 C617 5V 1 AMP 5 0604 15 605 KCOM P13 WARNING HIGH VOLTAG FPD HFPD P510 606 NFPD 609 LFPD 2608 VL 2607 0 aq56f eps 5725A 1661 ier PCA h Voltage Ig A3 Hi 3 Figure 9 9 10 Schematic Diagrams 9
80. 20 CABLE 3 5 Theory of operation 4 19 CURRENT MODE 3 5 CURRENT MODE indicator 3 5 FAULT 3 5 CURRENT OUTPUT binding posts 3 5 3 7 High voltage warning LEDs 4 13 6 8 OVERLOAD 3 5 D VOLTAGE 3 5 In guard lines DC current See current Installation Diagnostics 7 3 I bly Al Digital assembly A5 nterconnect assem 4 Access procedure 6 14 Access procedure Theory of operation Block diagram 4 17 y o op Theory of operation 4 16 L F LEDs Fan 2 5 7 High voltage warning 4 13 6 8 Cooling considerations Line PONET input 3 7 Line voltage selection switches 2 7 3 7 Filter e Power supply 4 12 Line voltage selecting 2 Fault Codes 7 3 Indicator FAULT Maintenance 6 3 Isolation procedure 7 6 Modes See functions and modes Filter med Mounting rack 2 5 Filter fan Front panel See uH Front panel features 3 4 ws Functional description overall 4 3 Operation in the 11A ac range Operation in the 11A dc range Out guard lines 5725A side 1100V ac range functional descri ption 4 5 4 6 ES OVERLOAD indicator 3 5 11A range functional description Functions and modes Current operate Current standby Standby 3 9 Performance 5 3 Voltage operae Placement 2 5 Voltage standby 3 10 Power Supply assembl 4 4 12 Fuse 2 8 B 5 Access procedure Accessing the main fus
81. 206 CR208 219 CR222 E255 F201 F202 H16 H25 H201 H207 H209 H210 H216 H230 H232 J201 J202 J204 J205 J222 J252 K201 K205 209 K202 204 L201 Description CAP AL 22UF 20 35V CAP POLYES 0 1UF 10 50V CAP POLYES 0 001UF 10 50V CAP POLYES 0 47UF 10 50V CAP CER 22PF 2 50V COG CAP AL 50000UF 100 10 20V LO CAP AL 470UF 20 35V SOLV PR CAP AL 10UF 20 63V SOLV PRO CAP CER 100PF 5 50V COG CAP CER 47PF 2 100V COG CAP TA 2 2UF 20 16V CAP POLYES 1UF 10 100V CAP CER 39PF 2 50V COG DIODE SI BV 75V IO 150MA 500MW DIODE SI N JFET CURRENT DIODE SI RECT BRIDGE BV 50V IO DIODE S1 400 PIV 1 TERM FASTON TAB 110 SOLDER FUSE 25X1 25 20A 32V FAST WASHER FLAT STL 170 375 031 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION RIVET S TUB OVAL AL 087 250 SCREW PH P LOCK STL 8 32 625 SCREW PH P SEMS STL 6 32 375 SCREW PH P LOCK MAG SS 6 32 2 NUT BROACH STL 6 32 SCREW PH P SS 10 32 250 CONN MATE N LOK HEADER 8 PIN CONN DIN41612 TYPE 1 2R 32 PIN HEADER 1 ROW 100CTR 2 HEADER 1 ROW 100CTR 2 CONN MATE N LOK HEADER 4 PIN CONN COAX SMB M PWB RELAY ARMATURE 2 FORM C 5V RELAY ARMATURE 2 FORM A 5VDC CHOKE 3 TURN Fluke Stock No 817056 817056 817056 649913 649913 720938 697409 697409 714832 830539 756700 816843 831495 832295 706804 447847 714840 203323 203323 203323 334839 886945 831586 831586 512889 51
82. 25W 25PP RES CF 6 8K 5 0 25W RES CF 51 5 0 25W RES CF 100 5 0 25W RES MF 5 49K 1 0 125W 100PP RES MF 60 4K 1 0 125W 100PP RES CF 10K 5 0 25W RES CF 330 5 0 25W RES MF 2K 1 0 125W 100PPM RES CC 1 2K 5 1W RES CF 1 5M 5 0 25W Fluke Stock No 110569 110270 530287 816314 698233 394122 698225 782482 782482 782540 346916 402586 248658 343426 343426 343426 343426 348821 348821 442517 248807 706317 309955 340174 344507 844662 368761 414540 414540 414540 414540 348771 348771 348771 348771 334565 291419 348839 348839 348839 368720 368720 235226 109892 349001 Tot Qty aa Notes 8 21 5725A Instruction Manual 8 22 Table 8 4 A3 High Voltage Amplifier PCA cont VR663 VR664 Reference Designator R640 R642 R641 R648 R643 R647 R651 R654 R661 R684 R692 R657 R658 R666 R667 R676 R677 R686 R687 R668 R669 R670 673 R695 RT663 TP601 616 U601 U603 U602 U604 U605 U606 VR601 VR602 VR658 VR603 VR666 VR651 VR665 VR652 657 VR659 662 Description RES CF 100K 5 0 25W RES MF 10K 1 0 125W 100PPM RES CF 4 7M 5 0 25W RES MF 20K 1 0 125W 100PPM RES CC 220 10 1W RES CC 100K 5 1W RES CC 3 9 5 1W RES CF 20K 5 0 25W RES CF 0 51 5 0 25W RES CF 10M 5 25W ASSY THERMISTOR JUMPER WIRE NONINSUL O 200CTR AMP DUAL LO OFFST VOLT L A
83. 3 9 1uF REEB 189 MTP2NSD 5 VR655 iW 20K CR6S3 19618 0658 10v C 8185 R751 1 9618 PGiA2 1N4448 5 i R669 2422198 51 VCOM MVOUT H PG1C2 R674 C657 gt lt gt X TO MONITOR VR657 H 51 253904 10v oar fon SU 2 5 D 149618 5 272 VRESB 2 R753 8 R678 144807 1K 197548 338 CR655 R679 C650 1N4448 128 TEMP SENSOR B RT663 gt R680 R681 R682 R683 P663 330 100 188 5564 1 466 663 1 wHT BLU HEATSINK R684 4 76 5663 2 2 WHT GRN 5 662 0662 m 19 G663 3 WwHT YEL 6 5 MrP2N5E dessi G664 4 4 WHT ORN T E 5 189618 198 ACV STBY 39PF KEY S key 2 50 D 198 OPER 1 E 8 Key 8685 Ls 0663 64 8 8 WHT VIO 188 H HERTSINK 2 ERTSINK 0665 18v 1 66 5 2 54 yR661 1N961B R686 P CHRNNEL HERTSINK 8557 2 L 4 VR662 R688 CR657 3 9 R698 10v amp 12v 7k 144067 ROBES 664 51 Q656 1N961B mE 2N2219 VCOM 0668 59 028720 LI VR664 5V_DORMANT L cess 45 STBY cees VR665 5 430 OPER TS du 15V C657 120 5725A 1061 1N965B 5 2 of 2 HVCOM 20 7 6 Figure 9 3 A3 High Voltage Amplifier PCA cont 9
84. 311 R306 provide a divided voltage for low level monitoring of the 400V supply by the analog monitor on the High Voltage Sense assembly A6 Resistors R332 R346 R347 do the same for the 400V supply Diodes CR314 CR315 CR319 and CR320 prevent damage to the series switches from inductive kickback during shutdown Control over the potential at TP305 is controlled in one of the two following ways 1 In normal operation P301 plugged onto the E301 header where the label SYS appears pins 1 and 2 the microprocessor strobes the control data HVSUPPLY into U302 by pulsing HVSTROBE This action occurs in parallel with writing HVSUPPLY information into a latch on the High Voltage Sense assembly A6 but there the sense of the HVSTROBE line is inverted Transistor Q304 provides correct polarity to the clock of U302 At any time the supply can be switched off TP305 brought to 5V independent of the processor by the current limit circuitry or SW301 pulling the set line 0302 high TP306 2 turn on a Power Supply assembly A4 by itself for troubleshooting you can plug P301 onto the E302 header where the label MAN appears pins 2 and 3 This allows momentary contact pushbutton switch SW302 to generate a strobe signal for U302 turning the supplies on You turn the supplies off by pressing switch SW301 You may wish to troubleshoot in the low voltage mode by plugging the high voltage secondary plug into J303 Section 7 co
85. 3986 Ferca KEY 215 K C612 215 luF C E 86268 2 0666 Yu V C613 HVCOMM 3 M J603 TP693 O 0553 0654 0657 SENSOR 72 HVIN Sone R621 SB ITE R622 FRONT 0661 0662 0665 PG2B2 1K m PAAR 62 8 0667 0670 TPe16 V DORMANT 15 V STANDBY G ID S 2 2VRC OPER R623 5 4 R624 R627 0651 0652 18K 18 0653 0656 8628 aa 9 0663 0664 lOOpF R629 0668 0669 10K BOTTOM Veok 2N39 6 K 1N4448 L COM vrea2 C815 of 50210 Rest pes 6 8V 18ggpF VCOM BS 0604 eae C618 oe 6 aie ACV OPERATE BELOW 12 Hz B 2 2uF ACV OPERATE 12 Hz TO 3 4kHz INTERCONNECT R636 3 4kHz S kHz RSSY OPERATE 3gkHz TO 18gkHz 15 BV DORMANT 15 REST R634 STBY T l 2kiw 18K 15V OPERATE eon esas 0886 U604C 18K 2 3906 0605 2 1 _ 400 8698 _ 6639 WS 243984 11 06068 R642 rhe gt 223 183448 182K 1 cR611 26185941 1 0624 7 144448 e 2 R641 C619 78 em 11 3 10K 15V DORMANT 7C 7V ACV STBY uv ISV ACV STBY 7Y 15 BIAS PG2C8 IM CLAMPD oon 1 ELERES PGIC7 R638 A 186 eee ae NOTE VOLTAGES BOXES ARE TYPICAL HVCOMM 7558
86. 5 5 5 10 1 10 10 1100V 1k 20k 15 2 5 5 90 6 10 15 20k 50k 40 2 10 10 275 11 30 30 50k 100k 130 2 30 30 500 30 40 40 i EN Output display formats Voltage or dBm dBm reference Voltage Maximum Current Load Limits Range Limits 2 2V Note 1 Minimum output 10 on each range 22V 50 mA 0 C 40 C gt 500 External sense Selectable for 2 2 22V 220V and 1100V ranges 5700A lt 100 kHz 5725A lt 30 kHz 220V 20 mA 40 C 50 C 1000 pF 1100V 6mA 600 pF Settling time to full accuracy 5725A Amplifier 1000 pF Note 2 Frequency Hz Settling time seconds 40 Hz 5 kHz 50 mA lt 20 7 1100V 5 kHz 30 kHz 70 mA 300 pF 120 120k 5 i gt 120k 2 30 kHz 100 kHz 70 mA 150 pF Note 3 Notes 1 second for amplitude or frequency range change 2 1 2 2V Range 100 kHz 1 2 MHz only uncertainty specifications cover loads to 10 mA or 1000 pF For higher loads load regulation is added The 5725A will drive up to 1000 pF of load capacitance Uncertainty specifications include loads to 300 pF and 150 pF as shown under Load Limits For capacitance s up to the maximum of 1000 pF add Load Regulation 3 Applies from 0 C to 40 C x 10 Hz 30 kHz 100V N N lt VOLTAGE m N T a T 10 Hz 50 Hz VOLT HERTZ CAPABILITY 1 kHz FREQUENCY 100 kHz 5700A 5725A 5205A 5215 7 wee x 10 V Hz 5700A 03 1 MHz 30 MHz sec
87. 513 74 08 14 7 DCOM 3515 27128 1 27 28 14 NOT USED 5 50501 5 4 3 2 1 Figure 9 5 5 Digital PCA cont 9 17 150 JOHN FLUKE MANUFACTURING CO J101 INC COPYRIGHT 1988 32 15 8 J152 E155 i K153 K151 K152 TP153 T mass 0779 V1 vp C156 152 C197 C150 RV151 Vie i R153 R150 63 R195 U160 TP160 xls U157 155 K108 0156 C169 0152 R151 C166 C153 C1558133 C158 c160R154 gt gt lt R1 C139 8170 C167 71 R169 CR151 165 C164 C162 118 177 1 76176 8115 R163 166 165 1164 180 175 171 lt 7150 CR150 1 9151 HIGH VOLTAGE SENSE 5725A 7601 REV 5725A Instruction Manual A6 843060 WARNING HIGH VOLTAG MCOM 113 104 114 111 L101 0103 1103 T C127 BS LO w115 C111 05 13 CR10 C1207 CR106 S404 WARNING A 2B MAINS RV40 VOLTAGE PRESENT 1 4 9402 Ps n RT403 70403 R403 lt lt CR405 pem R404 R402 R401 R402 CR403 CR401
88. 7075 707075 838482 807347 464016 602698 446724 385435 836874 733063 452888 806547 880711 823039 842948 541730 816579 853408 152207 Tot Qty N Notes Table 8 4 A3 High Voltage Amplifier PCA cont List of Replaceable Parts 8 Reference Designator MP668 MP674 MP679 Q601 Q602 Q603 Q606 Q604 Q605 Q660 Q653 Q654 Q661 Q667 Q670 Q657 Q662 Q665 Q658 Q666 Q659 R600 R601 R609 R612 R617 R620 R649 R650 R659 R674 R694 R698 R753 R602 R603 R664 R683 R688 R604 R605 R606 R607 R608 R610 R611 R614 R613 R615 R616 R618 R665 R675 R690 R691 R697 R699 701 R751 R752 R619 R653 R655 R656 R662 R663 R679 681 R685 R689 R693 R696 R621 R623 R626 R622 R624 R625 R627 630 R632 635 R644 646 R652 R631 R660 R678 R682 R636 R637 R638 R639 Description NUT HEX MINI SS 6 32 WASHER FLAT STL 149 375 031 SCREW PH P SEMS STL 6 32 313 TRANSISTOR SI N JFET TO 92 TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI N DMOS FET TO 72 TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI P MOS POWER 500V TRANSISTOR SI N MOS 40W 500V T TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI PNP SMALL SIGNAL RES WW 1 2 5 2W RES CF 1K 5 0 25W RES CF 4 7K 5 0 25W RES CF 680K 5 0 25W RES MF 100K 1 0 125W 100PPM RES MF 44 2K 1 0 125W 25PPM RES MF 649 1 0 125W 100PPM RES MF 2K 0 1 0 125W 25PPM RES MF 39 2K 0 1 0 125W 25P RES MF 3 92K 0 1 1
89. 725A Instruction Manual ANALOG MONITOR No MN CHRNNEL MUX 1H6116 HVSENSE 20 PG1B2 HV SENSE SC HVCOM HVCOM M 26 sa 1025 77 42 40 V IM 57 5V C152 15 136 4B0V_1M S6 EN 18 TuF T 5 2 E2 D 7122 4089 M 54 L3 1887 M 21163 13 16C ITEMP um ITEMP M 9 15 161 ICOHPL 11518 our 28 MUXOUT p aR i7 __ICAL 71 F OBK TCAL T FOBK 8 512 hen DAC OUT 11159 ha 14 MOND 56 Y a 1CRL I FDBK 162 cisa 5V FAN M 5 1514 2 15 MONE ___ ac Da 107 187 11 luF ATAT 71513 LB MONE 248 D I AIN 41516 ng 17 ONA 9 359 805 5515 12 02 hj 1265 04 VCOM VCOM ciel 0151 26855 DATA BUS I slur VC M 1276 PG3C7 278 07 FAN MONITOR 4 LRTCH 74HC373 R164 1 5K 28C STROBE 3 ___________11 8165 29 STROBE 4 1 5K C162 169 DES 39pF C164 MONR 39pF MONB MONG 2101 TO CURRENT MOND SE DCOM RSSEMBLY 7 B IRTN B IRTN Heiss 2 peeso ba t z B CURRENT
90. 725A the Digital assembly A5 the High Voltage Sense assembly A6 and the Current Amplifier assembly A2 All the 5725A hardware including digital is in guard except for the guard crossing and the CABLEOFF detection circuit Figure 4 2 is a block diagram of the Digital assembly The Digital assembly contains most of the digital circuitry including the following Microcomputer Hitachi 6303 CMOS External RAM CMOS static External ROM EEROM 2Kb X 8 Break detect circuitry Power up and reset circuitry Watchdog timer circuitry Front panel LEDs LED decoder and driver The High Voltage Sense assembly A6 contains the optoisolator link guard crossing to the 5700A Main CPU and the CABLEOFF circuit The Current Amplifier assembly A2 contains the interface to the digital bus two latches and three relay drivers and a relay driver chip Microcomputer 4 23 The 6303Y CMOS microcomputer is configured for Mode 1 operation with external RAM and external ROM Port 3 provides a common data bus 000 007 while port 1 and bits 0 through 5 of port 4 provide the address bus A0 A13 Bits 6 and 7 of port 4 are address lines 14 and 15 External RAM 4 24 External is enabled whenever A15 is high 14 is low hex 8000 BFFF and either RD or WR is true Reading and writing is controlled by bit 2 of port 7 External ROM 4 25 The external ROM U515 is enabled via ROMSEL whenever A15 and A14 are high hex C0
91. 80 350 480 360 480 100 130 110 130 Secondary Performance Specifications and Operating Characteristics Included in Uncertainty Specifications Temperature Coefficient Burden Maximum Noise Note 2 Voltage Load Stability 1 C 24 0 10 C Compliance Adder For Full Bandwidth Bandwidth Hours 10 40 C and Limits Note 3 Accuracy 0 1 10 Hz 10 10 kHz 40 50 C Note 4 pk pk ppm output nA output nA ppm output nA C Q ppm output nA 220 uA 5 1 1 40 3 1 10 2 20k 6 9 10 2 2 5 5 1 2 3 10 10 2 2 6 5 10 22 5 50 1 20 3 100 10 10 200 6 50 50 220 8 300 1 200 3 1 10 100 20 9 300 500 2 2 9 7 1 2 5 10 pA 3 2uA 2 12 1 5 pA 20 pA Note 5 5725A ppm output output HA 11 25 100 20 75 30 120 4 0 4 15 70 175 Notes Maximum output from 5700A terminals is 2 2A Uncertainty specifications for 220 and 2 2 mA ranges are increased by 1 3 X when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 Add to uncertainty specifications 200 X ppm for gt 100 mA on 220 mA range 10 X ppm for gt 1A 2 2A range Temperature coefficient is adder to uncertainty specifications It does not apply unless operating more 5 C from calibration temperature CD Burden voltage adder is an adder
92. 81 110619 110817 853296 152819 321182 842880 600707 842992 843115 850230 843032 172080 838169 113852 886341 885459 894183 886382 886379 886317 850164 775338 850243 886288 886283 698316 868786 864470 850172 843029 102889 102707 844712 823435 284174 843040 843045 843052 843057 859897 424416 Tot Qty Notes 8 5 5725A Instruction Manual 494 H T AMP TO 513 C amp D oot INTERCONNECT Pw MP301 AGSWI5SO 5725A T amp 1 of 8 aq24f tif Figure 8 1 Final Assembly 8 6 List of Replaceable Parts 8 Pu E in lt MP308 2 PL PL DIGITAL PCA 2 PL 2 PL MP304 2 PL MP30q M302 PL 5725A T amp B 2 of 8 aq25f tif Figure 8 1 Final Assembly cont 8 7 5725A Instruction Manual m 5 N 5 3 C COEdW 2 d 1 2 StH 7 9 Q gt BOTAN gj 6 D 2 7 3 W 97 2 SS D 4X HI 03174409 2 SOSH INS A 6 gt
93. 8860 110288 807347 464016 838482 114983 177022 772236 393785 855184 570515 836874 643916 602698 512269 352450 733063 830547 452888 Tot Qty Notes Table 8 3 A2 Current Amplifier PCA cont List of Replaceable Parts 8 Reference Designator MP28 MP38 81 82 203 205 206 MP211 MP215 MP225 MP256 MP812 MP816 Q201 Q202 Q203 Q204 Q205 Q206 Q207 Q208 0211 0212 0213 0214 0215 0216 R201 R202 R203 R204 R205 R206 R234 R274 R275 R207 R222 R232 R235 R239 241 R209 R211 R251 R252 R212 R213 R214 R217 R218 R231 R271 R215 R216 R249 R250 R219 R220 R221 R225 R226 R223 R224 R227 R228 Description INSULATOR CURRENT FOOT RUBBER ADHES GRY 44 DIA CLAMP PWB MOUNTING CLAMP PWB MOUNTING HEAT DIS PRESS ON TO 5 HEAT DIS VERT 83 50 395 TO HEAT DIS ACC AL FOIL TO 3 FUSE CLIP PCB SOCKET SINGLE PWB FOR 042 04 AIDE PCB PULL INSUL PT TRANSISTOR MOUNT DAP HEATSINK CURRENT HEATSINK RECTIFIER TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI PNP SMALL SIGNAL TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI BV 100V 50W TO 2 TRANSISTOR SI BV 100V 40W TO 2 TRANSISTOR SI BV 60V 200W TO 3 TRANSISTOR SI BV 60V 200W TO 3 TRANSISTOR SI N JFET TO 92 TRANSISTOR SI N JFET REMOTE CU TRANSISTOR SI PNP 80V 0 625W T TRANSISTOR SI N MOS 350MW TO 9 RESISTOR 086 OHM 1 4 TERM 10 RES MF 43 2 1 0 5W 100PPM RES MF 1
94. A 1021 VCOM VC M 1 of 3 2281 7 6 5 4 3 2 1 Figure 9 2 2 Current Amplifier PCA cont 9 7 5725A Instruction Manual 7 6 5 4 3 2 1 5 TP211 C236 QU CR218 58291 R269 4 6 58290 144604 4 7 ud 1C NC TROBE 21 4 7K d 2A STROBE 21 22uF Me 258599 22 STROBE 22 R271 06 NC 22 SE 9215 21 KCOM 0 28 SHUNTCRL SHUNTCAL 58599 19 INPUTS Wa 18 OUTSHORT ze 17 570061 16 OUTPTS Wm 1 15 OFFSETCAL os iS ENABLEB ENABLEB 13 ENABLE Am 9 cais 12 7 gg i CR219 CR222 0289 i 144004 pios 144804 209 IERL PG2A8 2 1uF 5 i Mie iat MC OMI rd iei 118 pgipg 4 11 ICOMPLM pei aa 128 15 1SV 2157 ENABLE 2m PG1 C8 VCOM R255 15V 4282 TP214 24293 V OM TO ANALOG SHIELD 4 PLACES 9218 B ka 14 ENABLE ENABLER 21 87 9 iggk MCOMI PG1C8 Rees PG1CB L TO FRONT OR RERR PRNEL TERMINALS IOUT gt
95. AN 5 5V 1 5V STROBE 21 28 2C STROBE 22 MONCOMP 208 16 STROBE 5 3 pl CAL ENABLE 216 DCOM CLAMPS 5 5 STROBE 5 02 58 5 l DCOM 228 22C pg 7 8 CAL ENABLE D4 48 05 238 23C Di 9 o 12 2 27 07 Di 24 D 02 11 12 1 12 202 psg 25c 02 CURRENT 03 13 olt CURREN 05 268 260 04 D4 15 16 HU 07 D78 27 06 ps 17 18 7 RECEIVE 288 280 STROBES Ds 19 28 gel CRBLEOFF 299 29 STROBE4 07 21 22 9 90 TRANSMIT STROBE STROBE 21 23 24 STROBE 22 818 CLR STROBE 3 25 26 RECEIVE XE COM 328 32 5 STROBE 4 27 28 CABLEOFF PG2B3 P182 STROBE 1 29 30 TRANSMIT HV SENSE CLR 31 32 A zs e 001 HVSTROBE 53 34 HVSUPPLYw ANALOG MONITOR 1001 TROUBLESHOOTING DIGITAL LPLGIIRL 5725A 1011 1 of 2 Schematic Diagrams I 9 4 3 2 1 NOTES 1 CIRCUIT 4 AREA FILL ELECTRICALLY TIED TO EARTH 2 CIRCUIT 1 AREA FILL ELECTRICALLY TIED TO VCOM IN SIGNAL TRANSFORMER CAN AR S cL on 3604 7 LFP WH
96. ANSFORMER COVER CUSHION TRANSFORMER MTG HOUSING 1 ROW 0 156 CTR LOCK 1 HOUSING 1 ROW 0 156 CTR LOCK 5 LOW FREQ XFORMER MED FREQUENCY HIGH FREQ POWER TRANSFORMER TERM STRIP BULKHEAD 375CTR 2 HARNESS CURRENT FRONT HARNESS CURRENT REAR CABLE TRANSFORMER BLACK CABLE TRANSFORMER WHITE Fluke Stock No 320093 772236 152181 149567 320051 114223 110270 854794 381087 845078 111518 312538 152165 114066 102780 853775 860143 850300 842919 881847 842898 850185 842914 446716 831164 823336 823344 823351 823369 276519 842997 843003 850222 850227 Tot Qty 20 N CQ NN A Notes List of Replaceable Parts pt H75 a DL 5725A 4201 1014 Figure 8 8 12 Transformer Enclosure Assembly 2 8 35 5725A Instruction Manual k hold pom 4 Ga z Ured f 4 EN q Ss s 73 OL 1d N om OY 11083 dx 019 s Car iH 1508 73NVd OL 5725A 4201 2 of 4 aq33t tif Figure 8 8 A12 Transformer Enclosure Assembly cont 8 36 List of Replaceable Parts 8 tohd loidW 1 DNIN2O1 7 27 2 Rug 1 NIS 7 Ng t8 sf Nid eM Hid
97. Amp The calibration amplifier scales the voltage dropped across R272 creating a signal 4 21 5725A Instruction Manual ICAL TP208 with the same amplitude and polarity as the current amplifier input voltage The calibration amplifier output is measured by circuitry within the 5700A during calibration of the 5725A current amplifier The calibration amplifier output is fed back to the 5700A Oscillator during ac current operation The feedback signal from the precision shunt is applied to both the inner and outer loop error amplifiers SENSE HI ISENSE LO pages 1 2 The error amplifier section drives the output stage TP204 so that the voltage across R272 is one tenth of the Current Amplifier input voltage VIND Thus the Current Amplifier is a transconductance amplifier output current is proportional to input voltage This transconductance is 5 Output Stage Section 4 36 Refer to page 1 of the Current Amplifier schematic Components U203 R203 R204 and R209 convert the bipolar ground referenced output signal from the error amplifier section into two unipolar supply referenced waveforms at the inputs to U204A and U204B IC U203 also isolates the output stage which is referenced to a floating common from the rest of the circuitry which is referenced to circuit common The operation of the positive and negative output halves are similar Only the positive output section is described below In respo
98. BAND HI OPR stay EXSNS ExcRD WBND gt CURRENT MODE 5725A STANDBY OUTPUT Lo OVERLOAD CABLE OFF HI m 988 9 AUX GUARD GROUND 2 k E 121 Note An overcompliance fault occurs if a low resistance load is not connected to the enabled 5725A binding posts when entering current operate mode Current operate mode is when only the CURRENT MODE indicator is lit In current operate mode current output either 5725A amplified current or redirected 57004 current is available at the 5725A binding posts Current operate occurs under the following conditions e When on the 5700A the current output location is set to 5725A and ac or dc current level is showing on the 5700A Output Display with the OPERATE annunciator lit e 5725 is selected a 5700A setup menu as the current amplifier and any of the following conditions are true 1 or de current 2 2A or above is showing on the 57004 Output Display with the OPERATE annunciator lit 2 Any level of current is showing the 5700A Output Display with the OPERATE annunciator lit and the BOOST key on the 5700A is pressed so that the BOOST indicator is lit 3 ac current or above is showing the 5700A Output Display with the OPERATE annunciator lit an
99. C651 C664 C667 C653 C660 C661 C663 CR602 605 CR607 612 CR651 CR653 CR655 CR652 CR654 CR656 CR657 H601 H603 H626 J603 J604 J605 J661 664 J653 K601 604 L601 L602 L603 MP28 MP81 MP82 MP601 653 657 658 Description CAP POLYES 1UF 10 50V CAP CER 100PF 5 50V COG CAP AL 10UF 20 63V SOLV PRO CAP CER 1 5PF 0 25PF 1000V C CAP CER 22PF 10 1000V COG CAP POLYES 0 1UF 10 50V CAP CER 3 3PF 0 25PF 100V COJ CAP POLYES 0 01UF 10 50V CAP POLYES 0 001UF 10 50V CAP AL 1UF 20 50V CAP AL 2 2UF 20 50V CAP CER 0 005UF 20 3000V Z5 CAP CER 10PF 10 3000V COG CAP CER 39PF 5 1000V COG CAP CER 0 01UF 100 0 1600V Z DIODE SI BV 75V lIO 150MA 500MW DIODE SI 1K PIV 1 0 RIVET S TUB OVAL AL 087 250 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION HEADER 1 ROW 100CTR 2 PIN HEADER 1 ROW 156CTR 10 PIN HEADER 1 ROW 156CTR 8 PIN CONN DIN41612 TYPE 1 28 32 PIN RELAY ARMATURE 2 FORM C 5V CHOKE 3 TURN INDUCTOR 2 2UH 5 108MHZ SHL INSULATOR PWR SUPPY HIGH VOLT CLAMP PWB MOUNTING CLAMP PWB MOUNTING AIDE PCB PULL HEAT DIS VERT 1 675 1 00 TO 22 HEAT DIS VERT 75X 50X 50 TO 2 INSUL PT TRANSISTOR MOUNT DAP Fluke Stock No 733089 831495 816843 816843 836346 817023 817023 649913 649913 649913 649913 816678 715037 715037 720938 782805 769687 188003 817049 817031 106930 203323 203323 203323 203323 70
100. COM MCOMI and MCOMC These lines are all at the same potential but they have different names corresponding to different paths taken to control the flow of ground currents These names correspond to destinations as shown in Table 4 3 Table 4 3 High Quality Reference Name Destination REFERENCE NAME DESTINATION ASSEMBLY MCOM High Voltage Sense A6 MCOMI Current A2 MCOMV Reference for high voltage input to calibration circuit High Voltage Sense A6 MCOMC Calibration circuit section of the High Voltage Sense A6 The ac calibration circuit is also in the sense amplifier section This circuit provides an extremely flat ac response for 5725 calibration of the sense amplifier This flat ac response is made possible by the use of U101 the Fluke rms sensor and a low impedance ranging resistor R103 The value of this resistor is 50 times less than the input resistor within Z100 as a result the effect of parasitic capacitances is reduced by 2500 A protection circuit made up of CR101 CR102 VR101 and VR102 clamp input voltages Op amp U100 is a forward gain block configured as an integrator with U101 A feedback circuit results whose output at TP106 is a dc voltage proportional to the rms value of the signal applied to R103 and the input sensing resistor of U101 Resistor R112 provides a simple means of protecting the output half of U101 while CR100 prevents 4 33 5725A Instruction Manual 4 34 Analo
101. Calibrator are provided here Read this section before operating the 5725A Instructions for connecting cables to a UUT Unit Under Test are in Section 4 of the 5700A Operator Manual Unpacking and Inspection 2 2 The 5725A is shipped in a container that is specially designed to prevent damage during shipping Inspect the 5725A carefully for damage and immediately report any damage to the shipper Instructions for inspection and claims are included in the shipping container If you need to reship the 5725A use the original container If it is not available you can order a new container from Fluke by identifying the amplifier s model and serial number When you unpack the 5725A check for all the standard equipment listed in Table 2 1 Report any shortage to the place of purchase or to the nearest Technical Service Center A List of Technical Service Centers is located in Section 8 of this manual If performance tests are required for your acceptance procedures refer to Section 3 of the 5700A Service Manual for instructions Line power cords available from Fluke are listed in Table 2 2 and illustrated in Figure 2 1 Table 2 1 Standard Equipment Item Model or Part Number Amplifier 5725A Line Power Cord See Table 2 2 and Figure 2 1 Shielded 5700A 5725A Interface Cable 842901 5725A Instruction Manual 823435 Spare 4A 250V Fuse 216846 Certificate of Calibration None 2 3 5725A Instruction Manual Tab
102. DCOM and KCOM B PACOM is the current return for signals from the 5700A including source current for driving the 5725A in the ac voltage function Current output from the 5700A when 5725 is selected as the current output location returns via B IRTN B SENSE LO High quality ground from the 5700A that is the reference point for the 5700 DAC and Oscillator assemblies 4 9 5725A Instruction Manual Inside the 5725A B SENSE LO is buffered by the 5725A with the equivalent voltage called MCOM B FEEDBACK During ac voltage operation is the output of the High Voltage Sense assembly this signal represents B SENSE HI divided by 100 and drives the 5700A ac dc thermal sensor During low frequency ac voltage calibration this is the sense path for the 260V dc from the 5700A Power Amplifier During ac current operation is the output of the current calibration amplifier It represents the output current divided by 5 and drives the 5700A Oscillator feedback During dc current operation voltage from the 5700A 2V dc range is fed to the 5725A on B FEEDBACK If B FEEDBACK is out of tolerance during 5725A ac voltage or current operation but no other faults are reported the 5700A sends a message to the 5725A asking for a sequenced shutdown into standby and displays a fault message on its Control Display The 5725A FAULT indicator lights A faulty 5700A 5725A interface connection could cause
103. FLLIKE 5725A Amplifier Instruction Manual PN 823435 January 1989 Rev 6 6 96 1993 1996 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective companies Table of Contents Chapter Title Page 1 Introduction and Specifications 1 1 Introduction awa sak aasan a a Ree 1 2 Where From Here 1 3 How to Use the 1 4 5725A Instruction Manual uqaqa 1 5 5700A Operator Manual asss 1 6 5700A Operator Reference Guide 1 7 5700A Remote Programming Reference 1 8 5700A Service Manuale n ettet nenne steh 1 9 Es 2 M 2 1 eT 2 2 Unpacking and Inspection 2 3 Service Information 1 2 4 Placement and Rack Mounting eere 2 5 Cooling Considerations 2 6 Connecting to the 5700A Calibrator 2 7 Selecting Lime Voltage 2 8 Accessing the Fuse 2 9 Connecting to Line 3 Operating Notes 3 Em
104. K 1 0 125W 100PPM RES MF 31 6K 1 0 125W 100PP RES MF 39 2K 0 1 0 125W 25P RES MF 90 9 0 1 0 5W 25PPM RES MF 3 92K 0 1 125W 25PP RES MF 2K 0 1 0 125W 25PPM RES CF 330 5 0 25W RES MF 3 48K 1 0 125W 100PP RES CC 5 1 5 1W RES CC 51 5 0 5W RES CF 1 5 0 25W Fluke Stock No 880716 358341 823039 842948 418384 800144 838169 756460 544056 541730 152207 843110 850169 698233 698225 402586 346916 454041 454033 483222 483230 832154 697987 816272 783449 490771 601823 168229 261610 261610 344507 344507 423947 844662 340174 368720 368720 260687 260687 219071 144717 357665 357665 Tot Qty m N m Notes 8 17 5725A Instruction Manual 8 18 Table 8 3 A2 Current Amplifier PCA cont Reference Designator R233 R237 R238 R273 R243 R244 R247 R248 R253 R277 R282 R283 R285 R286 R255 R267 R268 R256 259 R260 R261 R263 R290 295 R262 R264 R272 R276 R281 R284 RT201 RT202 TP201 205 TP207 215 U201 U202 U203 U204 U205 U206 U207 U208 U209 U210 U211 VR201 VR202 W6 2201 2203 Description RES MF 2K 1 0 125W 100PPM RES CF 100K 5 0 25W RES MF 232 1 0 125W 100PPM RES MF 10K 1 0 125W 100PPM RES CF 470K 5 0 25W RES MF 1M 1 0 125W 100PPM RES CC 5 1 5 0 5W RES CF 4 7K 5 0 25W RES CF 150 5 0 25W RES CF 1K 5 0 25W SHUNT ASSY RES MF 9 09K 1 0
105. Labels on each heat sink identify it as P1 P2 N1 or N2 To remove a heat sink remove its two retaining screws and slide it out of the assembly Accessing the Interconnect Assembly A1 6 14 Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply The Interconnect assembly is a vertical board oriented front to rear and is accessible for test probing by placing any other assembly into the service position To completely remove the Interconnect assembly as would be required to replace a relay proceed as follows 1 Perform the Initial Access Procedure 2 Completely remove the High Voltage Amplifier A3 and the Current Amplifier A2 assemblies by first placing each in the service position then disconnecting all cables attached to each of them Turn over the 5725A so that the bottom is facing up 4 Remove the bottom cover by removing the six screws on the bottom surface Completely remove the Power Supply A4 and the High Voltage Sense assemblies A6 by first placing each in the service position then disconnecting all cables attached to each of them Maintenance 6 Enabling Front or Rear Binding Posts Turn over the 5725A so that the top is facing up Remove the high voltage heat sink assembly as described under Accessing the High Voltage Output Transistors step
106. MP HIGH SPEED 200V US 3 COMPARATOR QUAD 14 PIN DIP ISOLATOR OPTO LED TO PHOTO RES IC COMPARATOR DUAL LO PWR 8 24 0 5 5 2 0 ZENER UNCOMP 6 8V 5 20 0MA 0 5 1 5 20 0 0 15 0 5 8 5 0 ZENER UNCOMP 10 0V 5 12 5MA 0 ZENER UNCOMP 20 0V 5 12 5MA 1 Fluke Stock No 348920 168260 543355 291872 109462 641282 641282 178574 178574 178574 441477 381954 875257 843032 816090 685164 845466 387233 887062 478354 267807 260695 159798 266601 246611 246611 291575 Tot Qty N m _ Notes List of Replaceable Parts 3 a 3 3 2 S 8 9 5 5 A 5 Z Z 2 3 8 v gt 8 g 9 z lt lt b le z 8625 CR605 630 5 8 8624 R636 CR611 VR602 z Ba 5 CR609 R626 5 aa oz CR608 R609 gt 2m R616 R OZ R629 cepa 616 gt ae 1645 CR602 gt m 0601 0603 100 L603 R600 8608 soon 1 9653 166 s gt R603 2 2 R621
107. MUR Replacing Fuse Cleaning the Air Filter General Cleaning iita Cleaning PCS nette Access 8 uie itti Initial Access Procedure Accessing the Power Supply Assembly A4 Accessing the Digital Assembly A5 Accessing the Current Amplifier Assembly 2 Accessing the High Voltage Amplifier Accessing the High Voltage Sense Assembly A6 Accessing the High Voltage Output Transistors Accessing the Interconnect Assembly A1 Enabling Front or Rear Binding Posts 6 1 5725A Instruction Manual 6 2 Maintenance 6 Introduction Warning Servicing described in this section is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you are qualified to do so Introduction 6 1 This section explains how to do routine maintenance tasks and how to access internal modules for troubleshooting and repair This section tells you how to do the following Replace the line power fuse Clean the air filter and how often to do so Clean external surfaces and internal pca s Access internal module
108. OCTAL D TRANSPARENT LA C CMOS HEX INVERTERS C CMOS OCTL LINE DRVR W 3 ST C 2K X 8 STAT RAM C CMOS QUAD INPUT NOR GATE C CMOS 14 STAGE BINARY COUNTE C CMOS 8 BIT MPU 2 0 MHZ 256 C VOLT SUPERVISOR 4 55V SENSE C CMOS DUAL MONOSTABLE MULTIB C CMOS QUAD 2 INPUT NAND GATE C NMOS 2K X 8 EEPROM 350 N L CMOS QUAD 2 INPUT AND GATE EPROM PROGRAMED 27128 150 051 CRYSTAL 4 9152 MHZ 0 005 RES CERM DIP 16 PIN 15 RES 10K _RES CERM DIP 16 8 RES 24 Fluke Stock No 649913 649913 649913 817056 697524 715284 816512 830430 831495 845136 845136 534834 534834 313247 417329 783688 836551 448217 478016 376236 452888 735365 843123 268797 343426 348896 339796 348839 782656 816090 743294 799924 741892 647222 811158 807701 876326 780577 454017 707323 811075 741801 860148 800367 355305 806406 Tot Qty Notes List of Replaceable Parts 8 DIGITAL PWB 5725A 7651 REV 843081 EN A5 TP510 5 0503 0510 1 lt N bis S cRnsoi 5 m 7502 5 TCR504 DCOM o 504 A EM 2 ICRS05 O0 5 TP501 m HEX RN HR FN F zJ 501 CR502 35 758 S9 C514 3 TCR506 502 E Fa z 5 0501 TP505 60 50 40 oh
109. OMP 505 815 814 CRBLEOFF 17 psg IRQ1 Pig ng 58 82 CAL ENABLE 18 49 6116 51 1802 P11 A1 SWITCH IS ON SENSE 8557 HVSUPPLY 19 p12 p2 48 82 EATCHSEL 8 ogg 9 098 PS3 HRLTw P13 a3 47 RS 81 7 01 10 001 45VD E 54 15 14 4 46 R4 5 82 6 0211 002 TO PINS 16 55 05 15 85 45 85 83 5 03 14 16 56 16 86 94 04 2501 7581 2 0513 47 0507 BUFFER P57 7 87 43 87 5 3 las 0515 085 19k 7 74HCT244 20 10K id DCOM 86 2 05116 11 DCOM DIGITAL TESTS STROBE 1 18 2 15 25 P4g ng 41 88 57 1 n 07117 087 ini 26 P61 P417R9 420 4 10 RB 2 5 27 39 RIQ als 29 a 887 P62 P42 R10 a9 STROBE 4 12 8 28 243 911 38 R18 19 510 13 34 mS STROBE 21 9 11 29 p64 2137 812 R WRx 21 74HCAB28 STROBE 22 77 18 pes 245 913 38 13 15 31 pgs P46 R14L99 17 32 p67 P47 R15 34 RSg4 1500 63 RDx 28 SVD P7 RD 20 4 47K 42 vss P71 uRu 52 _ 184 24 DC M 1 55 P72 R WRxLSi 5 R WRm 12 7 68 RD 504 DCDM HH B L 4 Mpa P74 BR 59 X 8 RAM 5 0 MODE 1 MP 5 MP1 13 74908 DCOM kos 55 NH 2 8 RAM IS SELECTED BY CRBLEOFF 11 47K STBY 7 STBY 84
110. OP 39 2K 6 ERROR 2 R2IS AMPLIFIER 0202 VCDM R251 R259 OP 37GN 4 3 92K 1MEG 4 4 VINI 5 1 7 gt PG2C8 ISENSE HI L 2 5 11 25V 2 8 JL C204 TE TS aur T STBL SENSE HI 0281 PETES a C211 LT1827 lt gt 22oF 4 R241 VC M 8 s TEST INP QUTP 4k C282 L R234 4 0 SZ 1N40g4 C 224 R252 R258 31 6K 18 22pF 3 92K 1MEG ISENSE HI TERN 11 25 PG2B8 VCOM ISENSE LO gu STBL SENSE R256 os R235 gt PG2B8 L PG182 1MEG STBL SENSE LO CR285 lt 2235 47 pF PETES ENABLE 1x 1 Oma luF R257 P amp 2C3 jen STBL SENSE LO 2251 STBL SENSE LO 51 R206 R209 4 OUTPUT STAGE 9 5W R268 IOUT 0211 31 6K T 92 9 5 1 P6288 C228 2 av 9 5 STBL SENSE Hr ENABLE 2x ACTIVE VR 202 HICOM HICOM a PG2C3 CLAMP R207 6 PG2 D4 PG2 D4 39 2K 39 lt gt 15V VR201 t 1 0204 oun 4 VCOM 1uF OFF 6 211 25 peat K an2219 CKTGRD 8 ee a 18 ICOM 11 4 R218 TL884 338 B B 0208 CR216 VCOM 2N5885 144204 5 ee re Penne 22uF 5 1 14 HEAT SINK TEMPERATURE MONI TOR 1C M L C206 1nF CR287 1N4448 12110 3 92 R216 4 984 PG2 C7 48k 2 R212 x gk VCOM 2205 2 0 R228 TO P2 5 PG1B1 1 8 R226 DRIVE MONITOR 207 55 R224 R286 ICOM A ICOMPLM R281 298 12k OFF 2121 A tak PG1B3 0202 2 3904 R238 5725
111. R132 R133 R134 R151 R169 R153 Description HEADER 1 ROW 156CTR RT 5 RELAY ARMATURE 2 FORM C 5V RELAY REED 1 FORM A 5VDC RELAY ARMATURE 2 FORM A 5VDC CHOKE 3 TURN CABLE ACCESS TIE 4 00L 10W 7 SHIELD DIGITAL SHIELD SENSOR INSULATOR SENSE SUPPORT ATTENUATOR FOOT RUBBER ADHES GRY 44 DIA CLAMP PWB MOUNTING CLAMP PWB MOUNTIN AIDE PCB PULL WIRE ATTENUATOR TRANSISTOR SI PNP 80V 0 625W T TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI N MOS 350MW TO 9 TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI NPN SMALL SIGNAL RES CF 1 5K 5 0 25W RES MF 86 6K 1 0 125W 100PP RES MF 40 2K 1 2W 10PPM RES CF 330 5 0 25W RES MF 2K 1 0 125W 100PPM RES MF 402K 0 1 0 125W 100P RES CF 240 5 0 25W RES CF 47 5 0 25W RES MF 1 21K 1 0 125W 100PP RES CF 4 7 5 0 25W RES MF 619 0 1 0 125W 100PP RES CF 100K 5 0 25W RES CF 3 9 5 0 25W RES CF 20K 5 0 25W RES CF 100 5 0 25W RES MF 2 67K 1 0 125W 100PP RES MF 1K 1 0 125W 100PPM RES MF 18 2K 1 0 125W 100PP RES MF 80 27K 0 1 0 125W 25 Fluke Stock No 844717 733063 733063 806950 830547 452888 172080 880695 880703 880708 823195 358341 823039 842948 541730 843094 816272 816298 783449 698233 698225 810432 810432 810432 772046 811042 830596 816629 714329 830588 822189 822189 822189 810507 816637 810515 658963 810473 697110 810465 820290 816595 756429 851337 Tot Qty
112. SW301 SW302 TP301 307 TP350 355 357 360 U301 U302 U350 U353 U351 U352 U354 VR301 VR302 VR304 VR305 VR303 VR306 VR307 VR351 VR352 ws Description RES CF 1K 5 0 25W RES CF 4 7K 5 0 25W RES CF 4 7 5 0 25W THERMISTOR DISC O 12 25C THERMISTOR DISC 0 81 25C SWITCH PUSHBUTTON SPST MOMENTA JUMPER WIRE NONINSUL 0 200C TR C COMPARATOR DUAL LO PWR 8 PI C CMOS DUAL D F F EDG TRG W C VOLT REG FIXED 5 VOLTS 1 5 C VOLT REG FIXED 15VOLTS 1 5A C VOLT REG FIXED 15 VOLTS 1 C OP AMP GENERAL PURPOSE 8 PI ZENER UNCOMP 15 0V 5 8 5MA 0 ZENER UNCOMP 16 0V 5 7 8MA 0 ZENER UNCOMP 3 9V 10 20 0MA 0 ZENER UNCOMP 3 9V 5 320 0MA 5 24 0 5 5 2 0 HARNESS HIGH VOLTAGE SUPPLY Fluke Stock No 343426 348821 441584 838144 838136 782656 816090 816090 478354 536433 647073 772830 413179 478107 266601 266601 325837 113316 386995 267807 843016 Tot Qty Notes List of Replaceable Parts 8 v 1 7 2062 1062 12 ten 8008 1560 187 01692 2 69682 66641 60641 s 8 QR ne z
113. T ORN 10 WHT YEL 9 8 VLF2 WHT BLU BLU 5 BLK WHT 5 MID FREQ RED 1 T2 BLK WHT Soe WHT BRN HIGH FREQ HE 3 3 T3 BLK WHT TERMINAL STRIP B 1 HVCOM BLK XFCOM _ 18 18 XFCOM XFCOM PG18R4 5725 1011 2 of 2 3 2 1 Figure 9 1 1 Interconnect cont 9 5 5725A Instruction Manual PWB CURRENT AMPLIFIER JOHN FLUKE MANUFACTURING CO INC COPYRIGHT 1989 r r 572 5 1621 REV C240 TP210 TP209 C217 C216 E 02 843073 9 fuis C227 C226 CR2 3 CR212 F202 F201 24519 9214 8215 Cre VR201 R247 Ld 0202 1 mios VR202 C228 R248 ry 0205 T C207 CR219 R250 1 CR21 CLIP 20 AMP FAST CLIP CLIP 20 AMP FAST CLIP R249 C205 c2 755 0206 C225 40224 00 R290 R295 R207 TP204 __1920 T T 1222 R291 R292 TP214 R233 CR221 R268 R293 R241 R205 R294 R267 R244 R253 R212 220 R261 0212 R277 R273 R271 R206 46233 REM U211 R276 0216 gt R222 R239 0215 y gt o F J202 R275 TP201 is 0210
114. V FAST RIVET S TUB OVAL AL 087 250 RIVET S TUB OVAL AL 087 250 RIVET POP DOME AL 125 316 RIVET S TUB OVAL STL 118 156 CONN MATE N LOK HEADER 8 PIN HEADER 1 ROW 156CTR 8 PIN CONN DIN41612 TYPE 1 2R 32 PIN INSULATOR PWR SUPPY HIGH VOLT CLAMP PWB MOUNTING CLAMP PWB MOUNTING HLDR FUSE 13 32 PWB MT HEAT DIS VERT 75X 50X 50 TO 2 Fluke Stock No 854075 854075 649913 649913 649913 649913 769695 820548 714857 851725 851725 714543 697409 715037 816819 816843 816843 782458 715284 707075 707075 203323 203323 831586 831586 831586 831586 831586 845412 586115 417329 853767 747600 838482 838482 807347 103424 570515 385435 836874 880711 823039 842948 516880 853408 Tot Qty 20 Notes Table 8 5 A4 Power Supply PCA cont List of Replaceable Parts 8 Reference Designator MP310 MP350 MP398 P301 Q301 Q302 Q317 Q318 Q303 305 Q315 Q321 Q322 Q306 Q307 Q311 Q316 Q323 Q324 Q308 Q309 Q310 Q314 0312 0313 0319 0320 Q350 Q351 R301 R302 R342 R343 R303 R308 R335 R339 R304 R305 R340 R341 R306 R332 R349 R307 R309 R356 R310 R311 R346 R347 R312 R317 R330 R331 R353 R357 360 R313 R329 R314 R315 R336 R337 R316 R324 R338 R318 R319 R320 R325 R328 R348 R354 R321 R322 R333 R323 R326 R327 R334 R344 R345 350 8352 Description AIDE PCB PULL HEAT DIS VERT 1 13X1 90X0 95 T PAD ADHESIVE
115. a ready means to quickly open all relays via a CLR signal that synchronously clears the driver latches The outputs of relay driver U157 control six relays on the High Voltage Sense assembly A6 four relays on the Interconnect assembly A1 and four relays on the High Voltage Amplifier assembly A3 Relays on the Interconnect and High Voltage Amplifier assemblies are controlled via HFPD VLFPD LFPD and MFPD Relay driver U158 is unique because all the high voltage relays connected directly to the outside world are driven from this latch This provides a way for hardware to clear the instrument to a safe state independently of the microprocessor This can happen in the following two ways e Via the CABLEOFF signal that is asserted when the 5700A 5725A link is physically disabled as described under Serial Interface Guard Crossing Section detecting an overcurrent condition in the high voltage power supply which only shuts down the high voltage supply but also clears latch U158 via the signal HVCLR Note that HVCLR CABLEOFF and CLR are diode OR ed to provide the composite clear function for U158 In addition to controlling all the high voltage relays U158 also generates control line CLAMPD for the High Voltage Amplifier assembly and HVSUPPLY for the Power Supply and Digital assemblies Comparator U1504 provides level shifting of the output of the latch U158 so that the JFET switch Q104 can be controlled Switch SW150 is
116. a strobe signal for U302 turning the supplies on You turn the supplies off by pressing switch SW301 5 You may want to troubleshoot in the low voltage mode by plugging the high voltage secondary plug into J303 The previous procedure describes how to do this 7 9 5725A Instruction Manual 7 10 Chapter 8 List of Replaceable Parts Introd ction u z E How to Obtain Parts Manual Status Information Newer Instr rBents 2 uu u uqun pusuta k bos SEVICE CEMETI S OTT 8 1 5725A Instruction Manual 8 2 List of Replaceable Parts 8 Introduction 8 1 This chapter contains an illustrated list of replaceable parts for the 7 300 7 600 12B and 18 Meters Parts are listed by assembly alphabetized by reference designator Each assembly is accompanied by an illustration showing the location of each part and its reference designator The parts lists give the following information Reference designator An indication if the part is subject to damage by static discharge Description Fluke stock number Total quantity Any special notes 1 factory selected part Caution A symbol indicates a device that may be damaged by static discharge How to Obtain Parts 8 2 Electrical components may be ordered directly from the manufacturer by using the manufacturers part number or from the Fluke Corporation and its authorized representatives by using the part number un
117. acing the 6 3 Cleaning the ct iet 6 4 GeneralCle amin g 6 5 Cleanmg Su 6 6 ACCESS 6 7 Initial Access 6 8 Accessing the Power Supply Assembly A4 6 9 Accessing the Digital Assembly A5 6 10 Accessing the Current Amplifier Assembly 2 6 11 Accessing the High Voltage Amplifier A3 6 12 Accessing the High Voltage Sense Assembly 6 13 Accessing the High Voltage Output Transistors 6 14 Accessing the Interconnect Assembly A1 6 15 Enabling Front or Rear Binding PoSstS 0000111 Hue me 7 1 7 23 3723A Fault COd6s ae 7 3 Self 7 4 Manual Tests for Fault Isolation 7 5 Problems 1 2 Fault at Power Up or When Entering Voltage Standby 7 6 Problem 3 Fault When Entering Voltage Operate 7 7 Problem 4 Fault When Entering Current Standby
118. age Sense assembly From there it is routed to the error amplifier on the Current assembly whenever the 5725 is in the current function The B FEEDBACK line returns the current calibration amplifier output to OSC SENSE HI during ac current operation The following assemblies are active in the 5725A current function In the 5700A CPU DAC Oscillator Switch Matrix Motherboard Rear Panel assemblies Plus the Oscillator assembly in the ac current function In the 5725A CPU Current High Voltage Sense Digital and Power Supply Theory of Operation 4 Overall Functional Description Operation in the 11A DC Range 4 5 For the dc current function the 5700A is configured for the dc 2 2V range The 57004 2V dc range drives an error amplifier with an input impedance of 40 kQ The gain of this amplifier is determined by this 40 kQ resistor with a 4 kQ feedback resistor and the value of the precision shunt The 5725A uses a 0 02Q shunt for the 11A function There is no feedback to the 5700A The 5725A monitors the error amplifier output voltage using the 16 channel multiplexer One channel of the multiplexer ICOMPL M is scanned every 30 milliseconds or faster with its output compared to 2V from the If the peak error amplifier output is more negative than the dac voltage MONCOMP goes LOW and is read by bit 6 of port 5 of U507 the CPU This indicates an overload condition and lights the OVERLOAD LED If a later scan shows
119. an area of live line voltage The Current Amplifier assembly lays flat on the top of the instrument toward the front Proceed as follows to access the Current Amplifier assembly 1 2 3 4 5 Perform the Initial Access Procedure Turn over the 5725A so that the bottom is facing up Remove the bottom cover by removing the six screws on the bottom surface Remove the two screws labeled _ and _B and turn the 5725A over again Remove the five retaining screws on the Current Amplifier assembly Lift the Current Amplifier assembly by pulling on the plastic wire tie loops and place the assembly in the service position Caution When reinstalling the assembly refer to Figure 6 6 and make sure cable harnesses are dressed as shown to avoid shorting wires to the bridge rectifier heat sink or chassis Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector 5725A Instruction Manual CURRENT AMPLIFIER BRIDGE RECTIFIER HEAT SINK en Ae b 4 74 7 y 55475555 A 79975 7477 N WAN Sosy Z NN m VM ROMA 17 CATION NN k DRESS CABLES AS SHOWN aq18f eps Figure 6 6 Correct Way to Dress Cables 6 11 The High Voltage Amplifier assembly lays flat on the top of
120. apply unless operated more than 5 C from calibration temperature or calibrated outside the range 19 C to 24 C Two examples a Calibrate at 20 C Temperature coefficient adder is not required unless operated below 15 C or above 25 C b Calibrate at 26 C Add 2 C temperature coefficient adder Additional temperature coefficient adder is not required unless operated below 21 C or above 31 C Refer to current derating factors table for loads outside of this range Active two wire compensation may be selected for values less than 100 kQ with either the front panel or the meter input terminals as reference plane Active compensation is limited to 11 mA load and to 2V burden Two wire compensation can be used only with Q meters that source continuous not pulsed current 5725A Instruction Manual Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under Current Two Wire Comp Four Wire Four Wire Q 1 lt 1 Note 1 Note 1 Note 2 4 4 4 4 4 X 10 44 1 5 X 10 44 1 6 X 10 44 3X 10 4 4 1X 107 4 4 1 9 X 10 44 0 1 4 4 0 19 5000 2 0 5000 3 8 2X 10 EN 8 8 X 10 1 5 X 107 2 9 X 10 1X 10 1 9 X 10 Notes 1 For errors occur due to thermally generated voltages within the 5700A Use the following equation to determine the error and add this error to the corresponding UNCERTAINTY or STABILITY specification Error
121. appropriate for proper operation of a 5725A in your country Use only a power cord that is in good condition Refer cord and connector changes to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate the 5725 in an atmosphere of explosive gas Do Not Remove Cover To avoid personal injury or death do not remove the 5725A cover Do not operate the 5725A without the cover properly installed There no user serviceable parts inside the 57254 so there is no need for the operator to ever remove the cover Do Not Attempt to Operate if Protection May be Impaired If the 5725A appears damaged or operates abnormally protection may be impaired Do not attempt to operate it When is doubt have the instrument serviced SERVICING SAFETY SUMMANY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On Dangerous voltage exist at many points inside this product To avoid personal injury do not touch exposed connections and components while power is on Whenever the nature of the operation permits keep one hand away from equipment to reduce the hazard of current flowing through vital organs of the body Do not wear a grounded wrist strap wh
122. ar panel To change the line voltage setting set the line voltage selection switches to the correct setting shown in Figure 2 3 CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING VOLTAGE SELECTION FUSE 2 3 4 100V N 110V EH HH 250V 115V EH EE FAST 120V 52 53 54 200V zs 220V 250V 230V EH FAST 240V EJ EH CAUTION REPL FUSE 5 CHASSIS GROUND 57008 CALIBRATOR m m m aq4f eps Figure 2 3 Line Power Label and Switch Location 2 7 5725A Instruction Manual Accessing the Fuse 2 8 Caution To prevent instrument damage verify that the correct fuse is installed for the line voltage setting Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent of the appropriate amperage rating Use only a 4A 250V fast blow fuse when the line voltage selection switches are set in the range 200 240V Note A spare 4A 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200 240V range The line power fuse is accessible on the rear panel The fuse rating label to the right of the fuse holder labeled FUSE shows the correct replacement fuse rating for each line voltage setting To check or replace the fuse refer to F
123. assembly by pulling on the plastic wire tie loops pivot it and insert its metal pegs in the two holes on the chassis as Figure 6 4 shows This puts the High Voltage Amplifier assembly in the service position 6 7 5725A Instruction Manual HIGH VOLTAGE AMPLIFIER A3 POWER SUPPLY A4 aq16f eps Figure 6 4 Initial Access Procedure 6 Verify that both LEDs CR317 and CR318 on the Power Supply assembly A4 are off If either is lit after three minutes there is a fault in the high voltage capacitor bleed off path Do not rely on an off condition as an indication that dangerous voltage no longer exists on the filter capacitors Warning Do not rely on the power supply leds as an indication of the presence of high voltage Always use a voltmeter to check for high voltage between TP307 and TP301 and between TP307 and TP304 7 confirm that high voltage has dissipated set a DMM to the 1000V dc range and take a reading with the common lead to TP307 and the high lead to TP301 on the Power Supply assembly This is the 400V filter capacitor test point and it should be at a safe level near zero 6 8 Maintenance 6 Access Procedures 8 Take another DMM reading with the common lead to TP307 and the high lead to TP304 on the Power Supply assembly This is the 400V filter capacitor test point and it should be at a safe level near zero This completes the initial access procedure Accessing the Power Supply Asse
124. back for the High Voltage Amplifier is provided by R606 R607 and R608 from the output signal MVOUT This means that the high voltage signal transformers are driven open loop by the High Voltage Amplifier Feedback for amplitude leveling is provided on the High Voltage Sense Assembly A6 The turns ratio of the hf transformer is less than the other transformers Resistor R608 compensates for the difference in turns ratio so the overall gain of the High Voltage Amplifier plus the signal transformers is 100 independent of frequency range Resistor R608 is switched in by K601 only in standby mode and in hf operation Signal Transformers 4 52 Three transformers cover the four frequency ranges as shown in Table 4 2 The If transformer is a C core The mf and hf transformers are toroids All three signal transformers are located in the transformer box on the left side of the instrument when viewed from the front Table 4 2 Signal Transformer Usage FREQUENCY HIGH VOLTAGE HIGH VOLTAGE RANGE TRANSFORMER TURNS RATIO AMPLIFIER TRANSFORMER OUTPUT MVOUT OUTPUT 40 Hz to 120 Hz LF Series 1 5 5 40 to 200V 220 to 1100V 120 Hz to 3 4 kHz LF Parallel 1 5 5 40 to 200V 220 to 1100V 3 4 kHz to 30 kHz MF 1 5 5 40 to 200V 220 to 1100V 30 kHz to 100 kHz HF 1 4 5 49 to 167V 220 to 750V Four control lines HFPD MFPD LFPD VLFPD control the frequency ranges The control lines are generated on the High Voltage Sense assembly These lines
125. closure Assembly 9 1 5725A Instruction Manual 9 2 JOHN FLUKE MFG COPYRIGHT 1988 Schematic Diagrams INTERCONNECT PWB 5725 1611 REV A1 843065 CAUTION HIGH VOLTAGE P102 32 30 0 MON DISABLE 34 aq48f eps 5725 1611 Figure 9 1 A1 Interconnect PCA 5725A Instruction Manual Figure 9 1 1 Interconnect PCA cont 8 7 6 5 4 3 2 1 168 150 5 5VK 1A 121 28 119 Cl 28 2 28 400V_IM 8H 6 400V 2400 IM 128 12 M 782 7C HVCOM HVCOM 400 CFPO 5 PRCOM 88 8C PACOM HVSUPPLYx 58 5 IM M HVSUPPLYw 13 13 4027 IM 5V 3A 3c 5v 5V 196 1A 1C IM 128 120 HVCOM NS n
126. cm deep equipment rack For bench top stacking the 5725A is equipped with non skid feet To mount the 5725A in an equipment rack order the accessory 5725A Rack Mount Kit Model Y5735 An instruction sheet is packed with the kit Caution Use only the rack mount slides included in the Y5735 kit Rack mount slides intended for other instruments can block the side ventilation holes on the 5725A and cause overheating Cooling Considerations 2 5 Caution Damage caused by overheating may occur if the area around the air intake is restricted the intake air is too warm or the fan filtrer becomes clogged Accuracy and dependability of all internal parts of the 5725A are enhanced by maintaining the coolest possible internal temperature By observing the following rules you can lengthen the life of the 5725A e The area around the fan filter must be at least inches from nearby walls or rack enclosures e Exhaust perforations on the sides of the 5725A must be clear of obstructions Most of the heat exits from the side vents near the front e Air entering the instrument must be room temperature Make sure that exhaust from another instrument is not directed into the fan inlet e Clean the fan filter every 30 days or more frequently if the 5725A is operated in a dusty environment Instructions for cleaning the fan filter are in Section 6 2 5 5725A Instruction Manual Connecting to the 5700A Calibrator 2 6 Proceed as follows t
127. control relays K601 to K604 which direct the High Voltage Amplifier output to the primary of the appropriate transformer and switch in feedback resistor R608 to compensate for the hf transformer turns ratio Relay K604 switches the primary windings of the If transformer into a series connected configuration for 40 to 120 Hz operation and into a parallel connected configuration for 120 Hz to 3 5 kHz operation Relays on the Interconnect assembly A1 switch the secondary transformer windings These Interconnect relays are driven by the same control lines as the High Voltage Amplifier assembly These lines originate from latch driver U157 on the High Voltage Sense assembly Temperature Monitoring 4 53 The temperature monitoring circuit estimates the junction temperature of the power MOSFETs by measuring the temperature of one of the high voltage heat sinks and adding a calculated temperature rise from heat sink to junction based on the current in the 400V supply The heat sink temperature is sensed with a stud mounted thermistor mounted into the P channel heat sink 2 via connector J603 Its negative temperature coefficient is linearized 4 29 5725A Instruction Manual to approximately 330 by R615 Op amp U603A provides a reference voltage of about 0 77V This reference voltage is applied to the circuit containing summing amplifier U603B R611 and the linearized thermistor The output of U603B is signal HV TEMP equal to
128. d R170 provide a small amount of positive feedback around U154A to ensure noise free operation for small input voltages Q150 forms a simple inverter that converts the comparator output to 5 logic levels This output is routed back to the 5725A Digital assembly A5 where it is acted on by the microprocessor Serial Interface Guard Crossing Section 4 57 The control link between the 5700A and the 5725A consists of a serial interface at the hardware level Serial data signals arrive via B RCV and leave via B XMIT These are translated to and from standard 5V logic levels by U160 an RS 232 interface chip that runs from a single 5V supply Internal charge pumps use C158 through C161 to generate RS 232 compatible supply levels of 10 A pair of dual optoisolators U159 and U161 isolate the serial interface signals from the remainder of the 5725A circuitry The serial interface uses half of each pair The other half of U161 signals the status of the 5700A 5725A interface cable to the microprocessor A 5V supply is available from the 5700A via pins 19 and 20 of J101 This supply drives the optoisolator LED when the cable connections are intact The 5V supply also provides coil drive for K153 This relay s contacts are in series with the coils of the other relays on the High Voltage Sense assembly Thus if the cable becomes disconnected all relays on the High Voltage Sense assembly automatically open The relays are configured so
129. d the BOOST key on the 5700A is pressed so that the BOOST indicator is lit 4 5700A is ranged locked on the range and any dc current ac current 1A or above is showing on the Output Display with the OPERATE annunciator lit Note Under certain settings of ac current especially high current at frequencies above I kHz a whine from the 5725A is audible This is caused by a piezo effect in the current output transistors and is normal 3 13 5725A Instruction Manual Conditions That Activate the 5725A 3 12 When the 5725A is connected to the 5700A and is selected as the amplifier for the active output function it supplies an output under the conditions shown in the following list These conditions are the same as VOLTAGE OPERATE and CURRENT OPERATE as previously described Whenever current above 2 2A is selected and the 5700A is set to operate Output available at the 5725A binding posts Whenever ac voltage in the 220 1100V range is selected and the 5700A is set to operate Note that the 5725A takes over the 1100V ac range of the 5700A if the 5725A is selected as the voltage amplifier in a setup menu Output available at the 57004 binding posts Whenever the 5700A BOOST key is toggled on while the 5700A output setting is in the operating range of the 5725A voltage or current Output location is 5725A for current 5700A for voltage If the Range softkey is set to LOCKED while supplying a curren
130. dations are made in Section 4 of the 5700A Operator Manual 5725A STANDBY Indicator Lit whenever the 5725A is in any of three standby modes This indicator is lit alone in standby mode it is lit at the same time as VOLTAGE MODE in voltage standby mode it is lit at the same time as CURRENT MODE in current standby mode See 5725A Operating Functions and Modes further on in this section CURRENT MODE Indicator Lit when the 5725A is in current standby or current operate mode In current standby mode the STANDBY indicator is also lit See 5725A Operating Functions and Modes further on in this section VOLTAGE MODE Indicator Lit when the 5725A is in voltage standby or voltage operate mode In voltage standby mode the STANDBY indicator is also lit See 5725A Operating Functions and Modes further on in this section POWER Switch Turns the power on and off The switch is a push push type the first push turns the power on and locks the switch in and the second push turns the power off and releases the switch CABLE OFF Indicator Lit when the 5700A 5725A interface cable is not connected or when the 5700A power is turned off This condition also lights the FAULT indicator OVERLOAD Indicator Lights on entering current operate mode in overcompliance conditions load not connected to the proper binding posts or load resistance too high The OVERLOAD indicator also lights on entering voltage operate mode if the l
131. der the heading FLUKE STOCK NO In the 5 order directly from the Fluke Parts Dept by calling 1 800 526 4731 Parts price information is available from the Fluke Corporation or its representatives Prices are also available in a Fluke Replacement Parts Catalog which is available on request In the event that the part ordered has been replaced by a new or improved part the replacement will be accompanied by an explanatory note and installation instructions if necessary To ensure prompt delivery of the correct part include the following information when you place an order Instrument model and serial number Part number and revision level of the pca containing the part Reference designator Fluke stock number Description as given under the DESCRIPTION heading Quantity Manual Status Information 8 3 The Manual Status Information table that precedes the parts list defines the assembly revision levels that are documented in the manual Revision levels are printed on the component side of each pca Newer Instruments 8 4 Changes and improvements made to the instrument are identified by incrementing the revision letter marked on the affected pca These changes are documented on a supplemental change errata sheet which when applicable is included with the manual 8 3 5725A Instruction Manual Service Centers 8 5 A list of service centers is located at the end of this section BY Note E Ni Cd This instrument may
132. e 2 8 6 3 Reduced voltage troubleshooting 7 8 Internal fuse data 4 13 Theory of operation 4 12 Replacing the main fuse 6 3 Troubleshooting 7 9 POWER switch Problems 2 5 7 3 R Rack mounting 2 5 Rear panel features 3 6 Remote control Replacing the fuse 6 3 5 Selecting line voltage Self diagnostics Service information Setting the output Setting up 2 3 Signal transformer usage High Voltage Amplifier 4 29 Specifications Standard equipment 2 3 Standby mode Current standby mode 3 11 Voltage standby mode Switches CALIBRATION 3 7 Line voltage selection 2 71 3 7 POWER 3 5 Index continued T Terminals CHASSIS GROUND CURRENT OUTPUT 3 5 3 7 HI LOW Troubleshooting Fault at power up Fault when entering current operate Fault when entering current standby Fault when entering voltage operate Fault when entering voltage standby Turning on the 5725 3 8 7 8 U Unpacking and inspection 2 3 Ventilation clearance needed for 2 5 Verification 5 3 Voltage Output 3 3 Selecting line Standby VOLTAGE MODE indicator 3 5 W Warm up period 3 8 5725A Instruction Manual Manual Supplement Manual Title 5725A Supplement Issue 1 Part Number 823435 Issue Date 6 96 Print Date January 1989 Page Count 1 Revision Date 6 6 96 This supplement contains informati
133. e 400V supply If the High Voltage Amplifier were operating Class B the 400V IM waveform would be half sines for a sinusoidal output current waveform The autobias sense circuit forces the average current in the 400V supply to be greater than the average of a half sine to produce Class A B operation This results in Class A operation for small output currents and for high output currents a 400V IM waveform that looks like a half sine at the peak but is more rounded at the base The autobias sense circuit does this by measuring the average of 400V IM and comparing it to the peak of 400V IM pi the average that would have been obtained for Class B operation plus an offset Op amp U606A and C621 are configured as a peak detector Resistors R647 and R648 divide the peak by pi Resistor R643 and the 15V supply provide the offset 15V 10K 4 3M 0 39 90 mA These signals are summed into integrator U601B The integrator is an error amplifier that drives the autobias current source circuitry via BIAS to achieve the desired relationship between the peak and average values of the current delivered by the 400V supply Theory of Operation 4 Detailed Circuit Description Op amp U606B senses the 400V supply and forces the autobias to the minimum bias condition when the 400V supplies are turned off Transistor Q606 forces the minimum bias condition when the window comparator is activated High Voltage Amplifier Feedback 4 51 Feed
134. e 5725A View A is a top view and view B is a bottom view Both views show the covers removed The 5725A is constructed so that two modules are completely accessible from the top and two modules are completely accessible from the bottom Each of these four modules can be lifted out of the chassis and locked in a service position by pivoting the assembly and inserting two machined pegs into two machined holes in the chassis towards the center of the instrument Figure 6 4 shows the High Voltage Amplifier assembly A3 in the Service position Once in the service position a module can be removed completely by disconnecting all cables attached to it HIGH VOLTAGE POWER AMPLIFIER DIGITAL INTERCONNECT SUPPLY A3 5 1 4 A TOP VIEW B BOTTOM VIEW FRONT FRONT ja a qd A MA T IE Pe fe Ne NEN EN VOLTAGE OUTPUT SIGNAL TRANSFORMER CURRENT AMPLIFIER WARNING HIGH A2 LETHAL VOLTAGE ON OUTPUT VOLTAGE TRANSISTOR HEAT SINKS AND SENSE MANY OTHER POINTS THROUGHOUT THE CHASSIS POWER TRANSFORMER aq15f eps Figure 6 3 Assembly Location Diagram 6 6 Maintenance 6 Access Procedures Warning Follow the instructions under Initial Access Procedure to make sure high voltage has been bled off before you touch anything inside the 5725A If you work 5725A with the power cord attached and or you are not certain the high voltag
135. e for the instrument An accurate 15V supply is obtained by using 0351 Regulator 0352 regulates the 15V supply An accurate 20V supply is obtained by regulating with U353 a 5V regulator but referencing it to the accurate 15V supply VR351 forces U353 to be forward biased as the 15V supply comes into regulation This avoids powering up the 20V supply through CR359 at the improper voltage reverse biasing 0353 A discrete regulator makes the negative 20V supply accurate U354 is an error amplifier that forces the junction of R352 and R350 to be OV In doing so the 20V supply is forced to be the inverse of the 20V supply within the matching of R350 and R352 Transistor Q350 provides a pass element for the negative regulator VR352 provides level shifting so that the drive required from U354 is within its output swing range 4 15 5725A Instruction Manual Fan Supply Section 4 21 The fan supply uses the same transformer secondary windings as the 15 and 20V supplies Its own full wave bridge rectifier diodes create a supply voltage of 25V Transistor Q351 is operated near saturation and provides the measurement point to tell the CPU whether the fan is running The output of Q351 is sent to the analog multiplexer on line FAN to accomplish this Digital Assembly A5 4 22 From a software standpoint digital circuitry functions as a subset of the 5700A in guard CPU Digital circuitry resides on three assemblies within the 5
136. e has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body The voltage output transistor heat sinks are at lethal voltage potential in ac V standby and ac V operate modes during normal operation and possibly in any other mode after a failure The heat sinks are exposed when any assembly is in the service position and when the heat sink cover is removed Initial Access Procedure 6 7 Before accessing any module from the top or bottom of the instrument proceed as follows to remove the top cover and verify that high voltage on the power supply capacitors has been bled off 1 2 3 4 Turn off the POWER switch Remove the line power cord from ac line power Wait three minutes Remove the top cover by removing the screws accessible on the top surface three front three rear Warning Before touching anything inside the 5725A do the following steps to make sure high voltage has been bled off Refer to Figure 6 4 for the location of items mentioned in this procedure Remove the five retaining screws on the High Voltage Amplifier assembly A3 Two screws secure each side rail and one seats the board into a mating connector on the Interconnect assembly Lift the High Voltage
137. e of the current amplifier The remaining differential amplifier is used during the internal portion of 5700A 5725A calibration and during ac current operation Output Section The output section contains several power transistors a heat sink two operational amplifiers a current buffer amplifier two current sensing resistors and related components The output stage is driven by the error amplifier section converting a 3V signal into 15 signal The output section is powered by floating supplies that are referenced to the ICOM current common The output stage is designed to drive inductive loads e Monitor Section The monitor section contains several op amps and comparators and a thermistor A temperature monitor circuit observes the temperature of the voltage output transistors Excessive output compliance voltage is detected by the drive monitor circuit Both monitor circuits send scaled voltages to a multiplexed comparator on the High Voltage Sense assembly A6 where abnormal operating conditions are detected e Control Section The control section contains nine relays a latched relay driver several transistors and a quad comparator The relays and transistors switch the Current Amplifier into ac current and dc current operating states a standby state and several self calibration and diagnostics states during which 5725A operation is monitored and characterized by measurement circuitry and software residing in the 5700A
138. e the 5725A chassis Do not open the 5725A cover without referring to the access procedures and warnings in section 6 Theory text in this section is here strictly for the purpose of describing how circuits work and contains no access procedures Overall Functional Description 4 2 The 5725A provides three primary functions for the 5700A Calibrator e Extended frequency range for high ac voltage e High range dc current e High range ac current The 5725A also has a secondary function of sourcing all 5700A current outputs without the 5700A Current guard through its own binding posts if so selected at the 5700A front panel controls Refer to Figure 4 1 the overall block diagram of the 5725A for this discussion Each 5725A function is described briefly next e 1100V AC Function The 1100V ac function can output 220 to 1100V 40 Hz to 30 kHz and 220 to 750V 30 kHz to 100 kHz The 1100V ac function is implemented with a gain of 100 amplifier Input for the ac voltage function comes from the 5700A Oscillator spanning the range of 2 2 to 11V The 5725A returns an oscillator sense voltage of precisely 1 100 of the output voltage to the 5700A Voltage outputs go through the 5725 5700 interconnect cable to either the 5700A front or rear panel OUTPUT binding posts 4 3 5725A Instruction Manual B IRTN B IGRD B CURRENT K2068 50 5 v lt Tout x 108 SHUNT lt gt
139. edures performed during Calibratel determine the value of R272 This is one of the factors in the de gain and the only factor in the ac gain of the Current Amplifier Calibrate2 Offset Calibration The amplifier is configured as in Calibratel except with its output routed by K208 to the 5700A Procedures performed during Calibrate2 determine the dc offset of the Current Amplifier Calibrate3 Gain Calibration Input is connected to BOOST IN and MCOM as in Operatel but Output is routed through the current sense path through K202 Output is not connected to output terminals Procedures performed during Calibrate3 determine the gain of the error amplifier the other factor in the dc gain of the Current Amplifier Power Supply Section 4 39 Refer to page 3 of the Current Amplifier schematic The unregulated high current supply is made from K208 through 209 F201 through 202 CR206 and C218 through C221 The regulated 20V supplies are composed of RT201 through 202 U205 U206 CR212 through 215 C222 C223 and associated components Thermistors RT201 and RT202 are PTC thermistors for current limiting and transformer protection 4 23 5725A Instruction Manual High Voltage Amplifier A3 4 40 The High Voltage Amplifier assembly operating with the step up signal transformers constitutes an amplifier with an inverting gain of 100 It amplifies 2 2V to 11V signals from the 5700A Oscillator and returns 220V t
140. ely because of external transient condition Troubleshooting Self Diagnostics Table 7 1 5725A Fault Codes cont FAULT NO 228 229 230 231 232 233 234 235 841 850 851 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 EXPLANATION 5725 Software TRAP 5725 Cable Was 5725 RESET power up or watchdog timer 5725 Guard Crossing Timeout 5725 Illegal Unexecutable Command 5725 Non Maskable Interrupt Occurred Either internal fault or external transient condition 5725 HVCLEAR Circuit Activated Internal fault requires service Output Tripped To Standby HVCLEAR circuit activated most likely because of external transient condition No 5725 Available For Selected Output Can t Store 5725 Switch In NORMAL Can t Format 5725 Switch In NORMAL 5725 ACV Sense Amp Fault Requires service 5725 ACV Standby 5725 Fault Requires service 5725 ACV Operate Wouldn t Converge Requires service 5725 ACV Operate 5725 Fault Requires service 5725 ACV Cal Sensor Test Died Requires service 5725 ACV Cal Sensor Fault Requires service 5725 Current Path To Shunt Open Requires service 5725 Shunt Sense Open Requires service 5725 Shunt Measurement Out Of Requires service Tolerance 5725 Current Amplifier Offset Too Large Requires service 5725 Current Drive Path Open Requires service 5725 Current Error Amplifier Failure Requires service 6 To test the current function
141. ent An output LOW turns an LED on The LED driver is selected by bit 7 of port 5 LEDSEL Optoisolator Link 4 30 An optoisolator circuit links the two channel guard crossing This guard crossing circuit and the related 5725A 5700A interconnection reside on the High Voltage Sense assembly A6 Serial communication to and from this guard crossing uses the RECEIVE and TRANSMIT lines respectively When the 57254 is not being used all cable inputs into the 5700A are tied to 57004 guard to shunt noise currents away Theory of Operation 4 Detailed Circuit Description Break Detect Circuitry 4 31 The 6303Y divides the 4 9152 2 crystal frequency by four to create the 1 2288 MHz ECLK This signal serves as the clock for the 74HC4020 counter U506 which is configured as a divide by 16384 The RECEIVE line is usually high except for the brief interval when characters are being transmitted As long as the low state is less than 13 34 ms RECEIVE holds the CLR of the 74HC4020 TRUE However if communication between the 5725A Amplifier and the 5700A Calibrator fails the 5700A attempts to reset the 5725A by sending a break holding RECEIVE low for greater than 26 7 ms This action causes the 74HC4020 counter output BREAK to go high Signal BREAK is NOR ed with CABLEOFF from the High Voltage Sense assembly A6 either signal causes NON MASKABLE INTERRUPT to the 6303 The 57004 also uses BREAK to reset the 5725A Power Up and R
142. erformance Specifications and Operating Characteristics Included in Uncertainty Specifications Temperature Maximum Stability Coefficient Distortion Range Frequency 1 0 10 C Output Impedance Bandwidth 24 Hours 10 40 10 Hz 10 MHz 40 50 C Hz tuV 96 output uV 10 20 5 05 05 05 10 20 40 5 05 05 035 10 40 20k 2 05 05 035 10 2 2 mV 20k 50k 2 al 50 035 10 50k 100k 3 2 2 035 10 100k 300k 3 3 3 3 30 300k 500k 5 4 4 3 30 500k 1M 5 5 5 2 30 10 20 5 2 3 05 11 20 40 5 2 3 035 11 40 20k 2 2 3 035 11 22 mV 20k 50k 2 4 5 50 035 11 50k 100k 3 5 5 035 11 100k 300k 5 6 6 3 30 300k 500k 10 1 1 3 30 500k 1M 16 1 1 1 30 ppm output uV ppm output 10 20 150 20 2 1 2 1 05 16 20 40 80 15 2 1 2 1 035 16 40 20 12 2 2 1 2 1 035 16 220 mV 20k 50k 10 2 15 2 15 2 50 035 16 50k 100k 10 2 15 4 15 4 035 16 100k 300k 20 4 80 5 80 5 3 30 300k 500k 100 10 80 5 80 5 3 30 500k 1M 200 20 80 5 80 5 2 30 Load Regulation ppm output uV 10 20 150 20 50 10 50 10 10 2 05 80 20 40 80 15 154 5 15 5 10 2 035 80 40 20k 12 4 2 1 5 2 10 4 035 80 2 2V 20k 50k 154 5 10 2 15 4 30 10 035 80 50k 100k 15 5 10 4 20 4 120 16 035 80 100k 300k 30 10 80 15 80 15 300 3 110 300k 500k 70 20 80 40 80 40 600 ppm 3 110 500k 1M 150 50 80 100 80 100 12 1 110 10 20 150 20 50 100 50 100 10
143. erification 5 Introduction Introduction 5 1 The 5725 is calibrated at the factory before shipping Calibration is traceable to the U S National Bureau of Standards All that is required to maintain traceability is to run 5700A calibration to external standards at the beginning of the calibration cycle and do performance verification every two years Calibration check and range calibration are optional procedures that are available for special needs The 5725A is calibrated whenever an attached 5700A is calibrated Where to Find Further Information 5 2 Information about 5700A calibration and therefore 5725A calibration is contained in the following sections of the 5700A manual set e Section 7 of the 5700A Operator Manual presents procedures for calibration calibration check and range calibration e Section 1 of the 57004 Operator Manual describes the calibration process and the theory behind its use to establish traceability to national standards The same section includes a description of the calibration check feature and suggests using it to develop a performance history for your 5700A This applies equally to 5725A e Section 3 of the 5700A Service Manual contains a performance verification procedure recommended every two years to maintain traceability 5 3 5725A Instruction Manual 5 4 6 1 6 3 6 4 6 5 6 6 6 7 6 8 6 10 6 11 6 12 6 13 6 14 6 15 Chapter 6 Maintenance COM E
144. eset Circuitry 4 32 Reset and glitch detection circuitry primarily consists of U508 a TL7705A This chip detects if the power supply falls below 4 5V if a reset input from a momentary contact switch occurs or if there is an output from the watchdog timer Any combination of these conditions resets the board via RESET for 130 ms Watchdog Timer 4 33 Watchdog circuitry contains a 4538 Dual Monostable Multivibrator The first multivibrator 0509 is configured as a 300 ms retriggerable one shot that can fire a second 3 ms one shot 05098 Control line STROBE 2 of the 6303 bit 1 port 6 retriggers the first one shot every 50 ms and refreshes the high voltage relay driver If STROBE 2 is stuck high or low during operation the first one shot is no longer retriggered and its output transitions low The second one shot configured to trigger on a falling edge now sends a pulse via RESIN to the TL7705A reset IC U508 This action forces the reset circuit to pull a hard reset on the 6303Y for 130 ms The first trigger to the 4538 occurs when the 7705 line makes a transition from low to high During normal operation STROBE 2 prevents another reset by retriggering the first one shot well before the 300 ms timeout The watchdog fires only if the CPU is executing erroneous code which does not activate STROBE 2 Current Amplifier Assembly A2 4 34 The Current Amplifier assembly enables the 5725A to extend the current output range
145. eshooting How to power up in the reduced voltage troubleshooting mode is described in Section 7 The four heat sink assemblies are attached to the High Voltage Amplifier assembly A3 via connectors P661 664 A thermistor is stud mounted to the P channel heat sink assembly 2 and attaches to the High Voltage Amplifier Assembly through J603 The temperature monitoring circuit described further on uses this thermistor Autobias Current Source 4 49 FET Q653 is a current mirror that provides a current to bias the midstage FET 0654 is a cascode stage to share the voltage and power Since the loop forces the dc output of the amplifier back to zero if the midstage current is increased the effect of increasing the midstage current is to increase the voltage drop across R674 Midstage current is increased until the gates of the output devices connected to either end of R674 are driven just hard enough to establish the desired idle current in the output stage The current that Q653 mirrors comes from Q657 which is driven by BIAS from the Autobias Sense Circuit FET Q657 stands off the high voltage to the 400V supply and makes the autobias circuit less sensitive to its ripple Autobias Sense Circuit 4 50 4 28 The autobias sense circuit senses the 400V IM from the Power Supply assembly A4 Signal 400V IM is a voltage developed across a R313 in the low side of the 400V supply which provides a voltage proportional to the current in th
146. g Monitor Section latch up by eliminating positive feedback resulting from positive output voltages from U100 Op amp U105 is simply a low noise inverting amplifier that scales the sensor output to 10 dB below the 5700A Oscillator output level The output of the calibration circuit AC AC goes to the 5700A during calibration through the analog monitor section The 16 channel multiplexer U151 takes a variety of inputs from all analog assemblies and provides a means of switching them to either a comparator U154A or to the B RCL line via K152 During normal operation the multiplexer output is routed exclusively to 4 56 the comparator Calibration requires routing the multiplexer output to the B RCL line which is routed back to the 5700A The B RCL line is measured by the precision adc circuit on the 5700A DAC assembly All inputs to the multiplexer are scaled so that inputs within its 15V power supply range Table 4 4 shows the signal name of the multiplexer input its description origin and purpose The state of the multiplexer is controlled by the microprocessor via data latched into 0152 Table 4 4 Signals Monitored by the Analog Monitor Section PARAMETER LIMITS 1 0 125V 400V IM Supply Current Power Supply Monitoring 0 125V 400V IM Supply Current Power Supply Monitoring 0 26V 400V Supply Voltage Power Supply Monitoring 0 26V 400V M Supply Voltage Power Supply Monitoring
147. ge Sense assembly The input amplifier has a high frequency gain of 5 5 but because feedback resistor R622 is ac coupled through C615 the gain is much higher at low frequencies The inverting input of U602 is buffered with 0601 The nominal output of the input amplifier LVAMP TP602 is about 6V dc 4 24 4 Theory of Operation Detailed Circuit Description HHO2AH 10410 OCEN EBgn MOLINOH awal AH ABBY 0790 M31114 259015019 9990 5 __ MOMMIH i EN 9917 3981SQIN SNISLUBH 13NNHHD d L lll EW SANTAN i Say 5816 3981 5018 3240 7 vL9M 39815 TINIIS 1 1 SXNISLH3H 2590 329071090 32 n05 1102812 LNIYYNI asnas WI ADOv 59180108 sulaoing AB v AWO2H 7090 zoan 36975 36t S 1298 ezgy NI M31341 Tdi INANI aq22f eps Figure 4 4 High Voltage Amplifier Assembly Block Diagram 4 25 5725A Instruction Manual Integrator 4 42 Op amp U601A is configured as an integrator to reduce the output offset of the input amplifier circuit This integrator senses the output voltage of the amplifier MVOUT through R604 and R605 and forces it to be zero with respect to HVCOMM Window Comparator 4 43 Comparators U604A and U604B form a window comparator that monitors
148. he drive monitor circuit an overcompliance condition is inferred from excessive error amplifier output Theory of Operation 4 Detailed Circuit Description Control and Switching Section 4 38 Refer to page 2 of the Current Amplifier schematic Relays K201 through 209 Q214 through 216 and U209 through 210 configure the Current Amplifier circuitry for the following six modes Current Standby Current Amplifier input is active through K201 Current Amplifier output is disconnected from instrument output terminals but is routed through the sense path through 202 Operate 1 Input is connected to BOOST IN and MCOM Output is connected to front or rear output terminals FET switches Q211 and Q213 are off enabling the error amplifier circuitry Operatel is the active mode for delivering up to 11A ac or dc to a UUT Operate2 The Current Amplifier is configured as in standby mode except K201 is off 5700A current source is routed to the 5725A current output terminals through K205 Operate2 is the active mode for delivering 2 2A or less to the 5725A terminals unless the 5725A 11A current range has been explicitly enabled from the 5700A front panel or by remote command Calibratel Shunt Calibration Input is shorted Error amplifiers are disabled with Q211 and Q213 Output is routed directly to current return path through K207 bypassing sense circuits 5700A current source is routed through K206 to the 5725A current sense path Proc
149. ht briefly and the 5725A undergoes a self test If the self test fails a fault message on the 5700A Control Display identifies the failure indicating that you should service the 5725A After the 5725A passes its self test it transfers its calibration constants to the 5700A During the transfer the BOOST indicator on the 5700A flashes For the few seconds that the BOOST indicator is flashing the 5725A is not usable After the transfer is complete the 5725A is in standby mode See 5725 Operating Functions and Modes for more information about standby mode Warm Up 3 5 When you turn on a cold 5725A warm it up for 30 minutes to allow the components inside to stabilize This ensures that the 5725A meets or exceeds the specifications listed in Section 1 If you turn off the 5725A after it has warmed up allow it to warm up again for at least twice the length of time it was turned off up to a maximum of 30 minutes of warm up For example if the 5725A is turned off for 10 minutes allow it to warm up again for at least 20 minutes 3 8 5725A Operating Functions and Modes Warning Operating Notes 3 5725A Operating Functions and Modes 3 6 Both the 5700A and 5725A can produce fatal voltages boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A during 5725A voltage operation the potential risk of injury or fatal accident is greater than during unamplified 5700A
150. ications and Operating Characteristics Included in Uncertainty Specifications Maximum Temperature Coefficient Noise and Stability Resistive Note 1 Distortion Frequency 1 Compliance Load 24 Hours Limits For Full Bandwidth Accuracy 10 Hz 50 kHz Note 2 lt 0 5V Burden Hz ppm output nA ppm output nA C 96 output 10 20 150 5 50 5 50 5 05 1 220 uA 20 40 8045 2045 2045 7 2k 054 1 40 1k 30 3 4 5 10 5 05 1 1k 5k 50 20 10 1 20 1 25 5 5k 10k 400 100 20 100 20 100 5 1 10 20 150 5 50 5 50 5 05 1 2 2 mA 20 40 80 5 20 4 20 4 7 500 05 1 40 1k 30 3 4 1 10 2 05 1 1k 5k 50 20 10 100 20 100 25 5 5k 10k 400 100 50 400 50 400 541 10 20 150 50 50 10 50 10 05 1 22 mA 20 40 80 50 20 10 20 10 7 150 05 1 40 1k 30 30 4 10 10 20 05 1 1k 5k 50 500 10 500 20 400 25 5 5k 10k 400 1 50 1pA 50 1 541 Hz ppm output uA ppm output 10 20 150 5 50 05 50 05 05 10 220 mA 20 40 80 5 20 05 20 05 7 15 05 10 40 1k 30 3 44 1 10 1 05 10 1k 5k 50 3 10 2 20 2 25 50 5k 10k 400 5 5045 5045 5 100 20 1k 50 5 4 1 10 1 5 100 2 2 14 5 1k 5k 80 20 10 5 20 5 Note 3 500 5k 10k 800 50 50 10 50 10 1 1 5725A Amplifier output 40 1k 75 100 20 75 30 75 05 11 1k 5k 100 150 40 75 50 75 3 3 Note 4 4 12 5k 10k 200 300 100 75 100 75 5 Notes Maximum out
151. igure 2 4 and proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power 2 Insert the blade of a standard screwdriver in the slot of the fuse holder labeled FUSE 3 Turn the screwdriver counterclockwise until the cap and fuse pop free 4 To reinstall the fuse reverse this procedure CURRENT OUTPUT aq5f eps Figure 2 4 Accessing the Fuse 2 8 Installation 2 Connecting to Line Power Connecting to Line Power 2 9 Warning To avoid shock hazard connect the factory supplied three conductor line power cord to a properly grounded power outlet Do not use a two conductor adapter or extension cord this will break the protective ground connection After verifying that the line voltage selection switches are correctly set verify that the correct fuse is installed Connect the 5725A to a properly grounded three prong outlet 2 9 5725A Instruction Manual 02 O2 55 59 W W 09 09 O9 O9 W C9 ta ae SAO Chapter 3 Operating Notes fduetuoi Front Panel Rear Panel Features vcscscccsnssessessestevesnenciecenesnscensesaderseasdadesnanebechuanncecsnan Turning on the 5725A Amplifier b Candi 5725A Instruction Manual 3 2 Operating Notes Introduction Introduction 3 1 This section provides setup and operat
152. ile working on this product A grounded wrist strap increase the risk of current flowing through the body Disconnect power before removing protective panels soldering or replacing components High voltage may still be present even after disconnecting power FIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live Conductor Shut off high voltage at once and ground the circuit If high voltage cannot be turned off quickly ground the circuit If the circuit cannot be broken or grounded use a board dry clothing or other nonconductor to free the victim Get Help Yell for help Call an emergency number Request medical assistance Never Accept Ordinary and General Tests for Death Symptoms of electric shock may include unconsciousness failure to breathe absence of pulse pallor and stiffness and well as severe burns Treat the Victim If the victim is not breathing begin CPR or mouth to mouth resuscitation if you are certified Lm Chapter 1 Introduction and Specifications Where to Go From How to Use the Manuals 5725A Instruction Manual 5700A Operator Manual enn nennen 5700A Operator Reference Guide 5700A Remote Programming Reference Guide 57004 Service
153. ink Too Hot Output Tripped To Standby 5725 Current Compliance Voltage Too High 5725 Current Compliance Voltage Too High 5725 400V Supply Did Not Shut Off 5725 400V Supply Did Not Shut Off 5725 Voltage Heatsink Too Hot 5725 Voltage Heatsink Too Hot 5725 400V Supply Too Small 5725 400V Supply Too Large 5725 400V Supply Too Large 5725 400V Supply Too Small 5725 400V Supply Current Too High Output Tripped To Standby 5725 400V Supply Current Too High Output Tripped To Standby 5725 Fan Not Working 5725 CLAMPS Fault Output Tripped To Standby EXPLANATION Requires service Requires service Requires service Requires service Requires service Requires service Requires service Requires service Requires service Current heat sink too hot in operate Internal fault requires service Most likely an external fault Requires service Requires service Requires service Voltage heat sink too hot in operate Requires service or improper line voltage selected Requires service or improper line voltage selected Requires service or improper line voltage selected Requires service or improper line voltage selected Internal fault requires service 400V supply too high in operate most likely an external fault Internal fault requires service 400V supply magnitude too high in operate most likely an external fault Requires service Internal fault requires service CLAMPS circuit activated most lik
154. ion information for the 5725A Amplifier This section begins with a reference for the 5725A front and rear panel features Information about setting up and powering up the 5725A follows Please read this information before operating the amplifier Also contained in this section is a description of all 5725A operating functions and modes Because the amplifier operates under complete control of the 5700A Calibrator operating instructions such as how to call up a specific output value are contained in Section 4 of the 5700A Operator Manual Operating the 5725A in remote control is covered in Section 5 of the 5700A Operator Manual 3 3 3 5725A Instruction Manual Front Panel Features 3 2 Front panel features are called out in Figure 3 1 Each front panel feature is described in Table 3 1 CURRENT OUTPUT VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT 10 POWER 20V OVERLOAD PK CABLE OFF aq6f eps Figure 3 1 Front Panel Features Operating Notes Rear Panel Features Table 3 1 Front Panel Features CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for front output You can set the 5700A to source all unamplified as well as amplified current through these binding posts The LO binding post is isolated from ground when in the current function and is open circuited at other times Cable and connection recommen
155. is in standby 4 35 5725A Instruction Manual Relays K102 and K103 provide switching that allows direct drive of the sense amplifier and its calibration circuitry by the 5700A These switches are used only during calibration Relays K105 and K109 are high voltage reed relays that provide output to the 5700A binding posts and remote sensing from the binding posts respectively during ac voltage operation These connections are accomplished by connecting the output of the High Voltage Amplifier to B OUT HI and the input of the sense amplifier to B SENSE Local sensing for standby and calibration is accomplished by K104 which enables the High Voltage Amplifier to drive the sense amplifier and its calibration circuitry directly While 57004 current is sourced through the 5725A OUTPUT binding posts of the 57254 relay K151 is energized to provide current guarding within the 5725A 57004 output current comes to the High Voltage Sense assembly via J101 and is routed to a guarded coaxial cable through J152 The current return path is via E155 While 5700A current is sourced at its own binding posts relay K151 is de energized to prevent compromising of the 5700A internal guard Control Section 4 59 4 36 The relay and switch control section consists simply of a pair of latched relay drivers U157 and U158 Each of these latches receives its input from the microprocessor bus and drives a bank of relays Additionally the microprocessor has
156. lace the Power Supply assembly in the service position as described in the access procedures in Section 6 7 8 Troubleshooting Testing the Power Supply By Itself 3 Remove plug P301 from J301 and inserting it into J303 Now the high voltage power supply will power up in the 50 mode The high voltage amplifier may also be serviced in the 50V mode Testing the Power Supply By Itself 7 10 To turn on a Power Supply assembly A4 by itself for troubleshooting proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power Warning Follow the instructions under initial access procedure in section 6 to make sure high voltage has been bled off before you touch anything inside the 5725A The power supply assembly generates lethal voltages Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock 2 Place the Power Supply assembly in the service position as described in the access procedures in Section 6 3 Plug P301 onto the E302 header where the label MAN appears pins 2 and 3 This allows momentary contact pushbutton switch SW302 to generate
157. le 2 2 Line Power Cord Types Available from Fluke TYPE North America North America Universal Euro United Kingdom Switzerland Australia South Africa VOLTAGE CURRENT 120V 15A 240V 15A 220V 16A 240V 13A 220V 10A 240V 10A 240V 5A FLUKE OPTION NUMBER gt LC 5 2 4 aq2f eps Figure 2 1 Line Power Cords Available for Fluke Instruments Installation 2 Service Information Service Information 2 3 Each 5725A Amplifier is warranted to the original purchaser for a period of one year beginning on the date received The warranty is located at the front of this manual Factory authorized service and technical advice for the 5725A is available at Fluke Service Centers Section 8 contains a list of Service Centers Warning Servicing described in this manual is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you are qualified to do so The owner may choose to repair a 5725A using the troubleshooting information in Section 7 to isolate a faulty module then use the Module Exchange Program Refer to the Fluke catalog or contact a Service Center representative for the module exchange procedure Placement and Hack Mounting 2 4 You can stack the 5725 on top of or below the 5700A Calibrator Choose the configuration that provides the easiest access to the 5700A Calibrator controls Or you can mount the 5725A in a standard width 24 inch 61
158. lies 4 49 Autobias Current Source 4 50 Autobias Sense Circuit 4 51 High Voltage Amplifier Feedback 4 52 Signal Transformers cicegi iiio are rentrer eras 4 53 Temperature 4 54 High Voltage Sense Assembly 4 55 Sense Amplifier 4 56 Analog Monitor 4 57 Serial Interface Guard Crossing Section 4 58 Analog Input Switching Section a 4 59 Control 4 60 AC Line Voltage Selection Section 4 2 Theory of Operation 4 Introduction Introduction 4 1 This section presents theory of operation in increasing level of detail The 5725 Amplifier is first broadly defined in an overall functional description and block diagram The overall functional description continues in more detail with functional descriptions by function ac I ac I and standby The overall picture is completed with a detailed discussion of how the 5700A and 5725A communicate The largest part of this section is devoted to detailed component level circuit descriptions grouped by assembly Warning Lethal voltage 500V appears on the internal heat sink assemblies and at many other points insid
159. limits are to 70 mA for frequencies above 5 kHz and to 50 mA for frequencies less than 5 kHz e Capacitive load limits are increased to 1000 pF Model 57254 operating functions and ranges are as follows e AC voltage 220 to 1100V rms up to 70 mA 50 mA lt 5 kHz 40 Hz to 30 kHz 220 to 750V rms up to 70 mA 30 kHz to 100 kHz DC current 0 to e AC current 1 to rms 40 Hz to 10 kHz 5725A Instruction Manual 1 4 Where to Go From Here 1 2 This manual is the operator and service manual for the 5725A However because the 5725A operates under the control of the 5700A Calibrator most operating instructions for the 5725A are in the 5700A manuals Topics such as selecting output values connecting to a UUT Unit Under Test and self calibration are covered in the 5700A Operator Manual The list below gives some specific pointers and the text further on describes how to use all the manuals to find 5725A information For More Information About e Unpacking and setup e Installation and rack mounting AC line power and interface cabling e Controls indicators and binding posts 5725A service information e Operating the amplifier e Cabling to a Unit Under Test Self calibration Full verification EEE 488 or serial remote operation e 5700A 57254 specifications e Theory of operation e Troubleshooting Ordering a part Refer To Section 2 of this manual Section 2 of this manual
160. lt is high voltage supply Fault 234 CLAMPS Fault 226 fault If yes and in standby mode suspect the Power Supply assembly A4 If yes and in voltage standby mode suspect the High Voltage Amplifier A3 and the high voltage output transistors 3 If the error on the 5700A is not an analog monitor fault high voltage supply Fault 234 or CLAMPS Fault 226 fault or if no fault is reported by the 5700A check for communications activity at pins 12 and 13 of U507 on the Digital assembly 5 The waveform should appear as shown facing the Digital schematic as waveform 4 If there is no activity suspect the communication circuitry on the High Voltage Sense Assembly or the Digital assembly 5725A Instruction Manual Problem 3 Fault When Entering Voltage Operate 7 6 Proceed as follows to isolate the problem in this condition 1 Suspect the 5700A 5725A interface cable 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 3 Suspect the High Voltage Amplifier assembly and the output transistor heat sink assemblies Problem 4 Fault When Entering Current Standby 7 7 Proceed as follows to isolate a problem in this condition 1 If an overcompliance error is showing fault 211 check for proper closing of the standby relay on the Current assembly K202 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 Pr
161. m the output of the sense amplifier to aid in achieving stability Transistor Q104 is necessary to route the output of the sense amplifier to the 5700A during calibration The signal routes to the B RCL line the high quality dc line to the 5700A calibration circuitry through the analog monitor section s 16 channel multiplexer This device cannot handle the output swing of the sense amplifier 15 6V without risking inadvertent functional failure because of its 15V supply limits The result is to isolate the multiplexer from the sense amplifier output during normal operation with the switch 0104 which is then also turned during calibration This is possible because the output of the sense amplifier is nominally 3 2V during calibration During ac voltage operation the input of the sense amplifier is either locally driven via K104 or remotely driven via K105 and K109 by the High Voltage Amplifier assembly amp 0103 forms a simple low offset voltage low input current buffer to isolate the B SENSE LO line from the rest of the 5725A circuitry B SENSE LO is the reference sense signal from the load provided through the 5700A and 5700A 5725A cable Buffering B SENSE LO ensures that the current flowing between the load and the 5700A Switch Matrix assembly along this reference sense line is minimized and as a result the series voltage drop is minimized The buffered B SENSE LO line is distributed throughout the 5725A as M
162. mat its own EEROM The 5725 informs the 5700A Calibrator if a problem has been encountered at power up The 5700A assumes responsibility for formatting the 5725A EEROM Data Latch 4 27 The Data Latch U510 is enabled via LATCHSEL when three conditions are met address bit A15 is 0 A14 is hex 4000 7FFF is 0 true Data Latch 0510 a 74HCT373 latches information on the external data bus 00 07 and sends this information to the LED latch U501 Current Amplifier assembly A2 and the High Voltage Sense assembly A6 Strobe Lines 4 28 The Current Amplifier A2 and High Voltage Sense A6 assemblies tie to the Data Latch external data bus output with latching relay drivers and or latches Information is strobed into the respective relay drivers latches by the state of any of the seven strobe lines The seven strobe lines STROBE 1 5 21 22 and a clear line CLR all asserted high are buffered U503 outputs on port 6 An additional strobe line called HVSTROBE for use by the High Voltage Sense and Power Supply assemblies is created from STROBE 2 combined with STROBE 2 ENABLE and HVSUPPLY Line HVSUPPLY is generated on the High Voltage Sense assembly The strobe rate varies from 50 ms for STROBE 2 to over 100 ms for the other strobe lines The CLR line opens all relays except K202 Led Driver 4 29 Front panel LEDs are driven by U501 a 74HCT373 latch which is capable of sinking 35 mA of LED operating curr
163. mbly A4 6 8 Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply The Power Supply assembly lays flat on the bottom of the instrument toward the front Proceed as follows to access the Power Supply assembly 1 Perform the Initial Access Procedure 2 Return the High Voltage Amplifier assembly and the Current Amplifier assembly if it has been accessed to the normal position and reinstall the assembly retaining screws Note When reinstalling assemblies lower them in place squarely to make sure their connectors seat correctly in the Interconnect assembly connectors Turn over the 5725A so that the bottom is facing up 4 Remove the five retaining screws on the Power Supply assembly Lift the Power Supply assembly by pulling on the plastic wire tie loops and place the assembly in the service position Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector Accessing the Digital Assembly A5 6 9 Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply The Digital assembly is oriented vertically just behind the
164. mer secondary switching circuitry Three high voltage reed relays 013 014 and 015 select one of three ac voltage output transformers fourth relay 001 is a high voltage armature type that connects the secondaries of the low frequency transformer in either a series or parallel fashion The circuit board has four layers Most connections are done on the inner two layers One outer layer is an earth ground plane the other outer layer is tied to the signal VCOM 5725A Instruction Manual Power Supply Assembly A4 4 16 The Power Supply assembly A4 provides regulated system supplies for all 5725A assemblies except as noted below as well as unregulated fan supply and high voltage supplies for the High Voltage Amplifier The assembly also includes microprocessor controlled switching and an independent current limit circuit Note Other power supplies are contained on the Current Amplifier assembly 2 A2 assembly includes a high current supply a local 220V supply The Power Supply assembly has four sections high voltage supply switching current limit and system supply section Each section is first briefly described then described in detail e High Voltage Supply Section The high voltage supply section consists of a simple unregulated power supply with the additional capability of being run at 400V dc for normal instrument operation or at 50V dc for troubleshooting e Switching Section The
165. n rms thermal sensor alternately measures two signals an unknown but adjustable ac signal and a known calibrated dc signal The output of the thermal sensor is measured by the adc allowing settling time for the sensor each time its input is changed The ac signal is adjusted until the thermal sensor output is the same for both signals Thus the dc voltage at the output of the thermal sensor is not important but differences in the dc voltage when the sensor input is switched between the ac variable and dc reference are important To ensure safe reliable operation the High Voltage Amplifier is turned on in the following sequence 1 The 5700A Oscillator is set to the 22V range and its output is channeled to the 5725A High Voltage Amplifier on line BOOST IN 2 Then the output of the High Voltage Amplifier is connected to the appropriate high voltage step up transformer one of three 11A Range Functional Description 4 4 4 6 The 5725A Current Amplifier is a transconductance amplifier that has a compliance voltage of 3 0V rms for the ac current function and 4 0V for the dc current function The transconductance amplifier has a gain of 3 e g 1V in gives 5A out Either the 57004 2V range for dc operation or the Oscillator for ac operation drives the transconductance amplifier Input voltage to the transconductance amplifier comes in on BOOST IN for ac current for dc current and enters the High Volt
166. nd current e Front panel local operation e Remote control operation IEEE 488 or RS 232 e Self calibration e Fault codes these appear on the 5700A Control Display or are read from the 57004 in remote control operation e Calibration constant symbolic names e Glossary of calibration related terms The 5700A Operator Manual comes with two pocket sized booklets one for front panel operation and one for remote programming 5700A Operator Reference Guide 1 6 The 5700A Operator Reference Guide contains a summary of operating instructions from the Operator Manual This booklet contains information needed to start up and operate the 5700A but since the 5700A controls the 5725A much of this information applies to the 5725A The booklet is included in the binder with the 5700A Operator Manual 5700A Remote Programming Reference Guide 1 7 The 5700A Remote Programming Reference Guide contains a summary of remote commands for the 5700A It also contains information needed to determine system status using the status byte and registers Remote commands and system status apply to a 5725A under control of the 5700A This booklet is also included in the binder with 5700A Operator Manual 5725A Instruction Manual 5700A Service Manual 1 8 The 5700A Service Manual is a maintenance guide for the 5700A The following 5725A topics are included in the 5700A Service Manual e Specifications for both the 5700A and 5725A these same specificati
167. nse to a positive polarity error amplifier output TP204 the current through R209 increases This same current flows into pin 2 of U203 causing the voltage drop across R203 to increase The voltage across R203 is applied to the positive input of U204A U204A drives Q203 Q205 and Q207 until the voltage at the emitter of Q207 is identical to the voltage at the non inverting input of U204A Test point TP204 is a test input for the output stage when in standby mode The resulting output stage current can be monitored at TP208 with a scaling of 200 mV A The quiescent operating point of the output devices is fixed by the bias current of U203 and current source CR205 at about 1A There is no output stage bias adjustment Capacitor C235 and resistors R256 through R260 provide a tertiary feedback path that guarantees stability when the 5725A is driving the specified inductive loads Monitor Section 4 37 4 22 Refer to page 1 of the Current Amplifier schematic Components U211C and D U210C RT203 CR207 and associated resistors and capacitors make up the temperature monitoring circuit Heat sink temperatures above approximately 85 C signal the ITEMPM fault condition Components U207 R280 through 284 and C234 generate a negative voltage at TP207 DRIVE MONITOR that remains less than 3 1 V in magnitude when the output compliance voltage is within the linear operating range of the output stage The output compliance voltage is not measured by t
168. nsor that does frequency characterization B OUT HI High voltage output from the 5725A step up transformers to be routed to either the 5700A front or rear panel terminals B SENSE HI High voltage sense line from the 5700A output terminals This signal is then attenuated 100 1 by the High Voltage Sense assembly BOOST IN During normal 5725A ac operation carries the 57004 DAC outputs which in turn drives either the High Voltage Amplifier or Current Amplifier During 5725A calibration BOOST IN drives the High Voltage Sense assembly with up to 260V from the 5700A Power Amplifier B CURRENT Analog line that carries the current high output from the 5700A When the user sets the current output location to 5725A 57004 menu this signal is routed to the 5725A binding posts Under this operating condition all 5700A 5725A current ranges are available from the same binding posts Line carries up to 2 2A in normal operation During current calibration this line carries 1 3A to measure the value of the 0 02Q 5725A current shunt B IRTN Current return for B CURRENT carries up to 2 2A Line B IRTN eventually ties to the same node as SCOM on the 5700A B IGRD Current guard voltage from the 5700A enables internal guarding within the 5725A only B VGRD 5700A guard Enables discrete guarding shielding within the 5725A B PACOM System common from the 5700A Once inside the 5725A it becomes VCOM HVCOM
169. ntains the procedures to do this Theory of Operation 4 Detailed Circuit Description Current Limit Section 4 19 Resistors R313 and R329 are current shunts for the high voltage supplies These are connected in series with the bridge rectifiers with the common point between the shunts being the high voltage supply common HVCOM The voltage developed across the 400V shunt is negative the voltage across the 400V shunt is positive The shunt voltages 400V IMON and 400V IMON in addition to being monitored by comparators in the current limit section are routed via the Interconnect assembly A1 to the High Voltage Sense assembly A6 where they are scanned by the analog monitor and to the High Voltage Amplifier assembly A3 to control the autobias circuitry The negative current monitor signal is clamped by CR307 and filtered by R328 and C308 before being directly compared to 0 36V by U301B The positive current monitor is more complicated because of its negative value To stay within the common mode operating range of U301A the shunt signal is first summed with a reference voltage via the R319 R318 network after which it is clamped by CR306 and filtered by C308 The comparator switching level is 0 18V The summing network scales the shunt signal for equal supply trip currents The outputs of U301A and U301B are open collector which allows them to be wire OR ed with the open drain output of Q309 The output of this logic drives Q308
170. o 1100 to the 5700A where they go to the 5700 OUTPUT HI OUTPUT LO binding posts The signals to and from the 5700A come through the High Voltage Sense assembly A6 where they are switched The High Voltage Amplifier assembly consists of an input amplifier integrator window comparator input clamp transconductance and cascode stage midstage midstage 400V filter high voltage heat sink assemblies autobias current source autobias sense circuit high voltage amplifier feedback and temperature monitoring circuits The High Voltage Amplifier drives the primary winding of the appropriate signal transformer depending on the frequency of operation Signal transformers are interfaced to the High Voltage Amplifier via connector J604 Relays that select signal transformers are mentioned under the heading Signal Transformers further on The High Voltage Amplifier assembly uses the 400V supplies from the Power Supply assembly Lethal voltage appears on the heat sink assemblies Do not open the 5725A cover without referring to the access procedures and warnings in Section 6 Figure 4 4 is a block diagram of the High Voltage Amplifier assembly Refer to the block diagram or the schematic to better understand theory of operation Input Amplifier 4 41 The input amplifier 0602 is amp whose input comes from HV IN J653 through R623 and R621 HV IN is the 2 2V to 11V ac signal generated by the 5700A and routed through the High Volta
171. o connect the 5725A to the 5700A 1 Turn the power off for both instruments and disconnect their line power cords 2 Connect either end of the interface cable to the 5725A connector labeled 5700A Dress the cable only as Figure 2 2 shows The figure shows how to dress the cable in installation arrangements with the 5725A on top or bottom 3 Connect the other end to the 5700A connector labeled 5725A The 5700A 5725A interface cable provides all the digital and analog control signals for the amplifier and it provides conductors to route amplified voltage to the 5700A OUTPUT binding posts 5725A AMPLIFIER 5700A CALIBRATOR 5700A 5725A CALIBRATOR AMPLIFIER aq3f eps Figure 2 2 Correct Way to Dress Interface Cable 2 6 Installation 2 Selecting Line Voltage Selecting Line Voltage 2 7 The 5725A arrives from the factory configured for the line voltage normally appropriate for the country of purchase or as specified at the time of purchase Check the line power label on the rear panel of the 5725A to verify that the line voltage matches local line power Figure 2 3 shows the location of the line power label and switches and the switch settings for each line voltage The 5725A can be set to operate from eight different nominal line voltages each voltage setting has a voltage tolerance of 10 and a frequency range of 47 to 63 Hz The line voltage switches are located on the bottom left side of the re
172. oad resistance is too low FAULT Indicator Lit whenever any fault condition is detected Normally a fault code and message appears on the 5700A Control Display when this happens The FAULT indicator also comes on with the CABLE OFF indicator when the 5700A 5725A interface cable is not connected In case of a FAULT indication check the 5700A 5725A interface cable connections make sure the 5700A power is on and check that the load is appropriate and connected to the correct binding posts Refer to Service Information in Section 2 or to Section 7 Troubleshooting in case of a FAULT indication that appears to be a malfunction 3 3 5 5725A Instruction Manual 3 6 Rear Panel Features Rear panel features are called out in Figure 3 2 Each rear panel feature is briefly described in Table 3 2 3 3 WARNING GROUNDING CAUTION For Fine PROTECTION CONNECTOR IN POWER CORD REPLACE ONLY WITH 250V FUSE MUST BE CONNECTED TO OF INDICATED RATING ENSURE PROTECTION FROM ELECTRONIC SHOCK VOLTAGE 47 63 Hz ES 750VA SELECTION JOHN FLUKE MFG CO INC MADE IN U S A PATENTS PENDING NO INTERNAL USER SERVICEABLE PARTS REFER SERVICE QUALIFIED SERVICE PERSONNEL CLEAN FILTER REMOVE FROM INSTRUMENT AND FLUSH WITH WARM SOAPY WATER 5700A CALIBRATOR ap CALIBRATION ENABLE NORMAL Figure 3 2 Rear Panel Features aq7f eps Operating
173. oblem 5 Fault When Entering Current Operate 7 8 Proceed as follows to isolate a problem in this condition 1 If an overcompliance error is showing fault 212 a Check for an open or too high resistance load b Suspect an open internal current output cable or the Current Amplifier assembly 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 Reduced Voltage Troubleshooting Mode 7 9 The high voltage supply on the Power Supply assembly A4 allows normal operation from a pair of nominal 400V dc supplies or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies To switch between normal and reduced voltage operation proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power Warning Follow the instructions under Initial Access Procedure in section 6 to make sure high voltage has been bled off before you touch anything inside the 5725A The power supply assembly generates lethal voltages Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock 2 P
174. of the LEDs However should an LED fail these zeners carry enough current to allow the bleeder resistors to function Fuses F301 and F302 protect the transformer against overload in case the 400V supplies are shorted Without these internal fuses a short circuit would cause excessive power dissipation in the power transformer even though ac line current would be insufficient to blow the main fuse Table 4 1 lists data for fuses F301 and F302 and the other internal fuses in the 5725A Caution For safety replace internal fuses only with fuses of the rating and type specified in Table 4 1 Surge arrestor E302 fires if the secondary voltage of the 400V supply exceeds 600V This should only occur if the 5725A is plugged into an ac line voltage of 200V or more when it is set to 100 120V E302 would then draw enough current to blow the main fuse thereby protecting the 5725A Table 4 1 Internal Fuse Data ASSEMBLY RATING TYPE Power Supply A4 2A 600V Littelfuse BLS or equivalent Power Supply A4 2A 600V Littelfuse BLS or equivalent Current Amplifier 2 20A 32V Bussman AGC or equivalent Current Amplifier A2 20A 32V Bussman AGC or equivalent 4 13 5725A Instruction Manual Switching Section 4 18 MOSFETs Q301 Q317 and 0302 0318 each in parallel are series switch elements for the 400V supply Similarly Q312 Q319 and Q313 Q320 are series switch elements for the 400V supply Resistor
175. olts Resolution 24 Hours 90 Days 180 Days 1 Year 96 output 1 1 46 10 nV 4 4 544 644 842 3 37 10 nv 4 1 4541 541 7 3 11 26 100 nv 244 3544 5 4 7 8 33 mV 17 100 nv 2 10 3410 45 10 6 16 110 6 2 2 40 3 40 45 40 6 40 330 mV 3 4 0 2 100 0 25 100 35 100 5 100 1 1V 14 10hV 2 400 25 400 35 400 5 400 3 5V 24 10hV 15 500 2 500 3 500 4 500 Amplitude Flatness 1 kHz Settling Frequency Reference Temperature Frequency Resolution Coefficient Distortion Voltage Range Accuracy 11 smv 3mV Hz Hz 10 30 01 3 3 3 100 7 40 30 120 01 4 4 4 100 7 40 120 1 2k 4 1 1 1 100 5 40 1 2k 12k 1 4 4 4 100 5 40 12k 120k 10 4 4 4 100 5 40 120k 1 2M 100 243yV 143uV 100 5 40 1 2M 2M 100k 243yV 1 3hV 100 0 5 40 2M 10M 100k 3uV 243yV 100 0 5 40 10M 20M 1M 6 3uV 4 3uV 150 0 5 34 20M 30M 1M 15 15uV 15 3uV 1 3uV 300 0 5 34 Additional Operating Information dBm reference 500 Range boundaries are at voltage points dBm levels are approximate Power 1 mW dBm 10 log 0 22361V across 500 1 mW 0 dBm Minimum output 300 uV 57 dBm Frequency uncertainty 0 01 Frequency resolution 11 999 counts to 1 1999 MHz 119 co
176. on necessary to ensure the accuracy of the above manual Enter the corrections in the manual if either one of the following conditions exist 1 The revision letter stamped on the indicated PCA is equal to or higher than that given with each change 2 No revision letter is indicated at the beginning of the change 1996 Fluke Corporation All rights reserved Printed in the U S A L LJ K 5725A Manual Supplement Change 1 On page 6 8 replace the first sentence in the Warning with the last sentence in step 6 On page 6 9 paragraph 6 8 replace step 2 with 2 Return the High Voltage Amplifier assembly A3 and the Current Amplifier assembly A2 if it has been accessed to the normal position and reinstall the assembly retaining screws Replace the last Note with Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector Ensure that both J301 and J303 are properly aligned and connected to their respective cables On page 6 11 paragraph 6 10 following the WARNING statement Change The Current Amplifier assembly lays flat on the top of the instrument toward the front To The Current Amplifier assembly lays flat on the top of the instrument toward the rear On page 6 12 paragraph 6 11 change the first sentence From The High Voltage Amplifier assembly lays flat on the top of the instrument toward the rear
177. onds for 5700A 1100V range 4 seconds for 5725A 1100V range Overshoot lt 10 Common mode rejection 140 dB DC to 400 Hz Frequency Ranges Hz 10 000 11 999 12 00 119 99 120 0 1199 9 1 200k 11 999k 12 00k 119 99k 120 0k 1 1999 Uncertainty 0 01 Resolution 11 999 counts Phase lock Selectable rear panel BNC input Phase uncertainty except 1100V range gt 30 Hz 1 0 05 kHz lt 30 Hz 3 Input voltage 1V to 10V rms sine wave do not exceed 1 for mV ranges Frequency range 10 Hz to 1 1999 MHz Lock range 2 of frequency Lock in time Larger of 10 frequency or 10 msec Phase reference Selectable rear panel BNC output Range 180 Phase Uncertainty except 1100V range 1 at quadrature points 0 90 180 elsewhere 2 Stability 0 1 Resolution 1 Output level 2 5V rms 0 2V Frequency range 50 kHz to 1 kHz useable 10 Hz to 1 1999 MHz Introduction and Specifications 1 Specifications Resistance Absolute Uncertainty of Characterized Value Relative Uncertainty Nominal 5 C from calibration temperature Note 1 1 Value 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Q 0 50 uQ 50 uQ 50 uQ 50 uQ 50 uQ 50 uQ 1 85 95 100 110 32 40 1 9 85 95 100 110 25 33 10 26 28 30 33 5 8 19 24 26 28 31 4 7 100 15 17 18 20 2 4 190 15 17 18 20 2 4 1k 11 12 13 15 2 3 5 1 9k 11 12 13 15 2 3 5 10k 9 11 12 14 2 3 5 19k 9 11 12 14 2 3 5 100k 11 13
178. ons are in this Instruction Manual e Full verification of the 5700A and 5725A recommended every two years e Calibration of the 5700A and 5725A same procedure as in the 5700A Operator Manual Specifications 1 9 Specifications are valid after allowing a warm up period of 30 minutes or if the 5725A has been recently on twice the time the 5725A has been turned off For example if the 5725A has been turned off for five minutes the warm up period is ten minutes Absolute uncertainty includes stability temperature coefficient linearity line and load regulation and traceability to external standards You do not need to add anything to absolute uncertainty to determine the ratios between 5700A 5725A uncertainties and the uncertainties of your calibration workload Relative uncertainty specifications are provided for enhanced accuracy applications These specifications apply when range constants are adjusted see Range Calibration in the 5700A Operator Manual To calculate absolute uncertainty you must combine the uncertainties of your external standards and techniques with relative uncertainty Secondary performance specifications and operating characteristics are included in the uncertainty specifications They are also provided separately for special calibration requirements such as stability or linearity testing 1 6 DC Voltage Range 220 mV 2 2 11V 22N 220V 1100V Resolution 10 nV 100 nV 1 uv 1uV 10 uV
179. orm which can cause the transformer to saturate To alleviate this problem a second clamp is placed in parallel with Q604 This second clamp is the photoresistor portion of the optical isolator U605 It has a considerably higher on resistance than Q604 so the two are used together When the clamp is to be turned off Q603 is turned off and the voltage on C618 begins its transition from nearly 15 to 15V At 15V 0604 is turned on but because 0605 is also on shunting current from the input of U605 the photoresistor is in the high impedance state When the voltage on C618 reaches about 9V Q605 turns off and the optoisolator is turned on putting the photoresistor into its low resistance state This has little effect on the input signal because the photoresistor is a higher impedance than the FET As the control voltage approaches zero Q604 turns off and the input is clamped only by the photoresistor As the control voltage continues toward 15V the photoresistor makes the transition to its off or high impedance state The photoresistor clamps symmetrically eliminating the dc transient on the input A similar transition takes place when light turns on the clamp but it happens much faster as the turn on transition is controlled by the time constant R631 C618 which is about an order of magnitude faster than the R637 C618 turn off time constant The microprocessor on the Digital assembly can also pull the clamp via control line CLAMPD which i
180. plus 1 5 cm 0 6 in for feet Width 43 2 cm 17 in standard rack width Depth 63 0 cm 24 8 in overall 57 8 cm 22 7 in rack depth 5725A Height 13 3 cm 5 25 in Width and depth same as 5700A Both units project 5 1 cm 2 in from rack front Weight 57004 27 kg 62 lbs 5725 32 kg 70 lbs 43 2 17 in 17 8 7 in COD OOO OO l 6 35 cm 2 5 in lt 63 cm 24 8 in 7H FOR CABLE ACCESS 5725A Instruction Manual 2 1 2 3 2 4 2 5 2 6 2 7 2 8 2 9 Chapter 2 Installation uC tins Unpacking and Inspection Service Placement and Rack Mounting Cooling Considerations Connecting to the 5700A Calibrator Selecting Line Accessing naha Connecting to Line 2 1 5725A Instruction Manual 2 2 Installation 2 Introduction Warning The 5725A amplifier is capable of supplying lethal voltages Do not touch the 5700A output terminals Read this section before operating the 5725A Introduction 2 1 This section provides instructions for unpacking and installing the 5725A Procedures for line voltage selection fuse replacement and connection to line power and the 5700A
181. ps Current standby mode is when both CURRENT MODE and 5725A STANDBY indicators are lit In current standby mode the 5725A is not supplying an output Current standby occurs under any of the following conditions e When the 5700A current output location is set to 5725A and any ac or dc current level is showing the 5700A Output Display with the STANDBY annunciator lit e f 5725A is selected in 5700A setup menu as the current amplifier and any of the following conditions are true 1 An ac or dc current 2 2A or above is showing on the 57004 Output Display with the STANDBY annunciator lit 2 Any level of dc current is showing on the 5700A Output Display with the STANDBY annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 3 Anaccurrent 1A or above is showing on the 5700A Output Display with the STANDBY annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 4 5700A is ranged locked on the range and any dc current or an ac current 1A or above is showing on the Output Display with the STANDBY annunciator lit 5725A Instruction Manual Voltage Operate 3 10 LF F 2 SUL mE IU lt H Z BOOST NO OUTPUT LIT CURRENT VOLTAGE VOA VOA OPR STBY EXSNS EX GRD BND BOOST OUTPUT VOLTAGE MODE OUTPUT 7 8 9 CURRENT HI 5725A STANDBY HERE Ta 4 5 6 Lo m ra
182. put from 5700A terminals is 2 2A Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by 1 3 x plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 Temperature coefficient is an adder to uncertainty specifications that does not apply unless operating more than 5 C from calibration temperature 2 For larger resistive loads multiply uncertainty specifications by actual load 2 maximum load for full acuracy 3 1 5V compliance limit above 1A 5725A Amplifier may be used in range lock mode down to 1A 4 For resistive loads within rated compliance voltage limits Minimum output 9 for 220 uA range 10 all other ranges 1A minimum for 5725A Inductive load limits 400 uH 57004 or 5725A 20 uH for 5700A output gt 1A Power factors 5700A 0 9 to 1 5725A 0 1 to 1 Subject to compliance voltage limits Frequency Range Hz 10 000 11 999 12 00 119 99 120 0 1199 9 1 200k 10 000k Uncertainty 0 01 Resolution 11 999 counts Settling time to full accuracy 5 seconds for 5700A ranges 6 seconds for 5725A 11A range 1 second for amplitude or frequency range change Overshoot lt 10 1 5725A Instruction Manual Wideband AC Voltage Option 03 Specifications apply to the end of the cable and 50Q termination used for calibration Absolute Uncertainty Range 5 C from calibration temperature 30 Hz 500 kHz V
183. r Rear Binding Pinal Assembly AT Interconnect PCA tene tree depu A2 Current Amplifier High Voltage Amplifier 22242 2 1 1 10 01 0000 rennen nennen AA Power Supply PCA ee repe AS Digital o High Voltage Sense 22220 46 A12 Transformer Enclosure Assembly a aa ec 8 41 A12 Transformer Enclosure Assembly 5725A Instruction Manual Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer s instructions may cause interference to radio and television reception It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference in a residential installation Operation is subject to the following two conditions e This device may not cause harmful interference e This device must accept any interference received including interference that may cause undesired operation There is no guarantee
184. ram 4 4 Theory of Operation 4 Overall Functional Description 11A DC Function The dc function is implemented with a transconductance voltage in current out amplifier with a gain of 5 If the 5700A outputs 2V into the 5725A the 5725A output is 10A This is transparent to the user The output range is 0 to 11A The 5725A delivers amplified current to either the front or rear panel binding posts of the 5725A depending on an internal hardware setup Reconfiguration requires removing the covers and is described in Section 6 11A AC Function The ac function is similar to the dc function The frequency range is 40 Hz to 10 kHz The output range is 1 to 11A rms As in the de current function all outputs from the 5725A either go through the front or rear panel of the 5725A Input to the 5725A comes from the 5700A Oscillator assembly 1100V AC Range Functional Description 4 3 The 5700A Oscillator assembly generates the driving ac voltage then sends it to the 5725 Power Amplifier for amplification The 5725A returns an attenuated feedback voltage for output correction The final output voltage is kept accurate by the high voltage sense amplifier and a real time software controlled feedback loop within the 5700A incorporating a 5700A ac dc thermal rms converter The 5700A Oscillator DAC digital to analog converter and ac dc thermal rms converter work together with the 5725 Power Amplifier and high voltage a
185. rcuits 5725A input and output switching relays relay drivers Analog monitor an 8 bit dac latch for mux latch for dac Subminiature D type connector to the 5700A 5700A current routing circuits Guard crossing AC line power selection circuitry AC line inrush current limiting circuitry Detailed Circuit Description 4 14 Detailed circuit descriptions for each printed circuit assembly are provided next Individual block diagrams are provided for the Current Amplifier A2 High Voltage Amplifier A3 High Voltage Sense A6 and Digital A5 assemblies You may also find it helpful to refer to the schematic diagrams Section 9 while reading theory for each assembly Interconnect Assembly A1 4 15 The Interconnect assembly A1 links the other five assemblies in the 5725A The interconnect assembly contains the following parts e Connectors and traces to interconnect the other assemblies and the fan There are three 32 pin DIN connectors on the Interconnect which connect the Power Supply assembly A4 High Voltage Amplifier assembly A3 and Current Amplifier assembly A2 A 64 pin DIN connector links the Interconnect assembly to the High Voltage Sense assembly A6 A 34 pin ribbon cable connector links the Interconnect assembly to the Digital assembly A5 Other cable assemblies attached to the Interconnect assembly go to the fan High Voltage assembly output and high voltage transformers e High voltage transfor
186. requency compensation Inputs to the output voltage stage are derived from deviations of the supply current of U102 from its quiescent value This topology depends on the increase in current from a particular power supply as the output of the monolithic op amp moves toward the value of that power supply This increasing current develops a drop across R108 for positive output voltages or a drop across R116 for negative output voltages These drops are amplified by Q100 and Q103 Transistors Q101 and Q102 buffer the output signal to present a low source impedance to the load Overall gain at low frequencies is controlled by Z100 a resistor network designed for good ac frequency response low power coefficient and low thermal settling time This network provides a feedback ratio of 0 99 or a closed loop gain of 0 01 As a result the entire sense amplifier is running in a virtual unity gain configuration Zeners VR103 and Theory of Operation 4 Detailed Circuit Description 105 reduce apparent supply voltage seen by U102 Transistors Q105 and Q106 along with R131 C117 and R132 C1 18 filter the supply to reduce common mode errors at high frequency Capacitor C108 provides ac tuning for the sense amplifier This capacitor balances most of the parasitic capacitance picked up across the input resistor portion of Z100 Capacitor C109 in parallel provides fine adjustment of response if needed Components L105 and R130 isolate capacitive loads fro
187. s 2 through 4 8 Remove the two screws that secure the Interconnect assembly and pop the assembly free of the two bosses Enabling Front or Rear Binding Posts 6 15 The 5725A comes from the factory configured for front or rear current output as requested by the purchaser when the system was ordered Only one output location can be enabled at a time You can reconfigure the output location by opening the chassis detaching a cable and tying it away and attaching another cable to a jack on the Current Amplifier assembly Warning To avoid electrical shock proceed only after completing the initial access procedure which removes line power and checks for high voltage on the power supply Proceed as follows to change the current output location 1 2 Perform the Initial Access Procedure Remove the five retaining screws on the Current Amplifier assembly Lift the current amplifier assembly by pulling on the plastic wire tie loops and place the assembly in the service position Refer to Figure 6 7 and locate J222 on the Current Amplifier assembly Perform step 5 to change from front to rear or perform step 6 to change from rear to front To enable the rear binding posts and disable the front remove the cable that goes to the front binding posts from J222 and plug the cable that goes to the rear binding posts into 7222 To enable the front binding posts and disable the rear remove the cable that goes to the rear binding po
188. s clogged The air filter must be removed and cleaned every 30 days or more frequently if the calibrator is operated in a dusty environment The air filter is accessible from the rear panel of the calibrator To clean the air filter refer to Figure 6 2 and proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power 2 Squeeze together the sides of the air filter housing and pull it off 3 Wash the filter element and housing in soapy water 4 Rinse the filter element and housing in fresh running water 5 Shake out excess water then allow the filter element to dry thoroughly before reinstalling it 6 Snap the filter housing back into place Maintenance 6 General Cleaning aq14f eps Figure 6 2 Accessing the Air Filter General Cleaning 6 4 To keep the 5725A looking like new clean the case front panel and rear panel using soft cloth slightly dampened with water or a non abrasive mild cleaning solution that does not harm plastics Caution Do not use aromatic hydrocarbons or chlorinated solvents for cleaning They can damage the plastic materials used in the amplifier Cleaning PCA s 6 5 Printed circuit assemblies only need cleaning after repair work After soldering on a pca remove flux residue using isopropyl alcohol and a cotton swab 6 5 5725A Instruction Manual Access Procedures 6 6 Figure 6 3 shows the location of all major modules in th
189. s for servicing For troubleshooting information refer to Section 7 For pointers to calibration information refer to Section 5 Replacing the Fuse 6 2 Caution To prevent instrument damage verify that the correct fuse is installed for the line voltage setting Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent of the appropriate amperage rating Use only a 4A 250V fast blow fuse when the line voltage selection switches are set in the range 200 240V Note A spare 4A 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200 to 240V range The line power fuse is accessible on the rear panel The fuse rating label to the right of the fuse holder labeled FUSE shows the correct replacement fuse rating for each line voltage setting To replace the fuse refer to Figure 6 1 and proceed as follows 1 2 Turn off POWER switch and disconnect the line power cord from ac line power Insert the blade of a standard screwdriver into the slot of the fuse holder labeled FUSE Turn the screwdriver counterclockwise until the cap and fuse pop free To install a new fuse reverse this procedure 6 3 5725A Instruction Manual aq13f eps Figure 6 1 Accessing the Fuse Cleaning the Air Filter 6 3 Caution Damage caused by overheating may occur if the area around the fan is restricted the intake air is too warm or the air filter become
190. s latched into a driver on the High Voltage Sense assembly A6 Line CLAMPD is asserted during a sequenced turn on power down of the High Voltage Amplifier assembly A3 or during a transition to another frequency range Comparator U604C level shifts CLAMPD and provides an OR function with the window comparator output 4 26 Theory of Operation 4 Detailed Circuit Description Transconductance and Cascode Stage 4 45 The output voltage of the input amplifier 0602 LVAMP is transformed into current by Q602 The nominal current is about 8 5 mA This implies that the nominal output voltage of the input amplifier is about 6V 15V 0085 1000 6 5 9 The current is passed through a cascode FET Q661 which can stand off the voltage required about 400V A zener diode similar to VR656 protects most of the power MOSFETs from damage to their gate oxide layer by excessive gate voltage approximately 20V A gate resistor similar to R675 suppresses high frequency oscillations Midstage 4 46 The current from Q661 generates a voltage of about 8 5V across R698 The ac voltage gain from TP602 the LVAMP output to R698 is unity Transistor Q666 mirrors the current into the midstage with an ac gain of 5 The midstage current is about 28 mA The midstage current passes through two cascode FETs Q662 and Q665 to bias resistor R674 Transistor Q660 VR658 and R678 form a 21 mA current source that along with R674 establishes the mid
191. s of Q655 and Q656 on the N channel heat sink assembly 2 and Q663 and Q664 on the P channel heat sink assembly 2 Their gates are driven with the voltage on R674 Resistors R670 through R673 sense the output current while Q658 and Q659 limit the current to about 2 4A Diodes CR652 and CR654 help to reduce the amount of stored charge in the power MOSFETs that must be driven when they are turned on and off The power MOSFETs on the 1 heat sink assemblies are driven cascode to share the voltage drop between the output MVOUT and their respective 400V supply This also balances their power dissipation with the 2 heat sink assemblies Their gates are driven from the voltage divider R654 and R661 or R684 and R692 Capacitors C654 and C661 4 27 5725A Instruction Manual compensate for the capacitance seen at the gates of the power MOSFETs on the 1 heat sink assemblies Their sources establish the voltage on the gates of the cascode FETs in the midstage Q654 and Q662 The power MOSFETs are in the TO3 package and are mounted to the heat sinks using a heat conductive pad electrically conductive as well to minimize thermal resistance to the heat sink This means that the heat sinks can have 400V on them during normal operation Do not open the 5725A cover without referring to the access procedures and warnings in Section 6 Lower voltage supplies of about 50 are available the board to replace the 400V supplies during test and troubl
192. signator CR1 CR13 15 H13 H22 J1 J2 J100 J103 K1 K13 15 MP1 MP5 P102 P202 P351 P653 TP1 TP2 Description DIODE SI BV 75V IO 150MA 500MW RIVET S TUB OVAL AL 087 343 RIVET S TUB OVAL STL 118 218 HEADER 2 ROW 100CTR 34 PIN HEADER 1 ROW 156CTR 10 PIN HEADER 1 ROW 100CTR RT ANG 2 RELAY ARMATURE 2 FORM C 5VDC RELAY REED 1 FORM A 5VDC BRACKET RIGHT ANGLE TAPPED BRA GUIDE HEATSINK CONN DIN41612 TYPE R RT ANG 64 CONN DIN41612 TYPE 1 2R RT ANG JUMPER WIRE NONINSUL 0 200CTR Fluke Stock No 203323 838458 103606 836577 446724 851667 810911 806950 404525 860205 782102 836882 816090 Tot Qty Notes List of Replaceable Parts 8 ce ve 118 514 NOW 1 ot 0 0 ze 19 1 0 HOIH NOIIRVO 90578 IV 119 6216 202d 123 02831 1 8861 1H9INAdO2 ONT 702 94N jyn14 NHOF 5725 1611 aq36f eps Figure 8 2 1 Interconnect PCA 8 15 5725A Instruction Manual 8 16 Table 8 3 A2 Current Amplifier PCA Reference Designator 201 202 207 208 211 212 226 227 236 C203 C204 C216 217 238 240 C205 C206 C210 C214 C215 C234 C213 C218 221 C222 C223 C224 C225 C228 C230 C233 C235 C237 CR201 204 CR207 CR220 CR221 CR205 CR
193. stage bias current at about 28 mA FET Q653 is a current source from the 400V supply controlled by the auto bias circuitry The bias for Q654 and 0662 comes from the high voltage heat sink assemblies and is maintained about halfway between the output voltage and the 400V supply or 400V supply respectively The bias for Q665 comes from zener VR665 FET Q667 and its associated parts which form a mA current source to bias the zener Zener VR661 provides some additional protection for Q665 and Q666 Capacitor C660 and R612 provide the dominant pole to stabilize the midstage amplifier Gain bandwidth is set to about 7 MHz Midstage 400V Filter 4 47 FET Q670 is a filter to reduce the 120 Hz and output signal ripple on the 400V supply Zener VR663 acting as a normal diode clamps the gate of Q670 at the positive peak of the ripple on the 400V supply As soon as the 400V supply moves away from the positive peak the gate voltage is heavily filtered by R695 and C663 The zener action of VR663 and VR664 prevents Q670 from being damaged by excessive gate voltage as the 400V supply is turned on High Voltage Heat Sink Assemblies 4 48 The output power MOSFET devices are mounted in pairs on the four high voltage heat sink assemblies Each pair is driven with the same gate voltage To ensure they equally divide the current the MOSFETS are matched for gate source voltage at 0 5A and have 3 9Q source resistors The push pull output stage consist
194. sts from J222 and plug the cable that goes to the front binding posts into 7222 Use a non conductive plastic wire tie to secure the unused cable to the right side ventilation slots 6 15 5725A Instruction Manual FRONT OUTPUT SECURE UNUSED CABLE CURRENT AMPLIFIER A2 REAR OUTPUT aq23f eps Figure 6 7 Enabling Front or Rear Binding Posts Caution Make sure that the unused connector is neatly secured in the recessed area of the chassis side away from the High Voltage Sense assembly as Figure 6 7 shows If it is allowed to hang down shorting can occur 8 Reconfiguration is complete Reinstall the Current Amplifier and High Voltage Amplifier assemblies being careful to correctly seat each assembly into the connector on the Interconnect assembly 9 Reinstall the top cover 7 1 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 10 Chapter 7 Troubleshooting Title 5725 Fault A ANRE Self Dia gnosSti RT Manual Tests for Fault Isolation Problems 1 or 2 Fault at Power Up or When Entering Voltage Standby Problem 3 Fault When Entering Voltage Operate Problem 4 Fault When Entering Current Standby Problem 5
195. t allows the 5700A to detect a cable off or 5725A power off condition Description of the Out Guard Lines 5725A Side 4 11 The following list describes the five 5725A out guard lines B RCV Serial Communication Receive Receives serial data from the 5700A connects to the B SCT line of the 5700A B XMIT Serial Communication Transmit Transmits serial data to the 5700A connects to the B SCR line of the 5700A B 5V 5700A out guard supply that powers optoisolators and 5725A CABLEOFF relay B 5VCOM 5700A out guard supply common for above B CINT Boost Cable Interlock Hardwire loop around system on the 5725A that is polled at least every 100 ms by the 5700A to determine if the 5700A 5725A cable is connected and if the 5725A is turned on Returns a low to the 5700A if above is true A pull up resistor on the 5700A leaves this line high if the interconnect cable is open or if the 5725A is turned off Theory of Operation 4 Overall Functional Description Description of the In Guard Lines 4 12 The following list describes the 11 5725A in guard lines B RCL High quality analog line from the 5725A which carries critical signals to be measured by the 5700A adc during either 5725A calibration or 5725A self diagnostics During calibration these signals are ICAL output of the current calibration amplifier HVSENSE DC output of the sense amplifier during dc gain ac characterization AC AC buffered output of the 5725A thermal rms se
196. t greater than 2 24 then the 57254 stays active if the 57004 output setting is adjusted down to dc or down to 1A ac Output available at the 5725A binding posts Regardless of the BOOST AMP TYPES setting in the 5700A setup menus all unamplified 5700A current is supplied through the 5725A binding posts when on the 5700A the current output location is set to 5725A the 5700A output is set to any ac or dc current level and the 5700A OPERATE annunciator is lit 4 27 4 29 Chapter 4 Theory of Operation Overall Functional 1100V AC Range Functional Description Range Functional Description Operation in the 11 DC Operation in AC Voltage and Current Standby Modes Voltage Standby ieu caen p Rescue etra bs adea Current Standby ssec How the 5700A and 5725A Communicate Description of the Out Guard Lines 5725A Side Description of the In Guard Lines Functional Summaries by Assembly Detailed Circuit Description 2 Interconnect Assembly A1 Power Supply Assembly A4
197. t through your body If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock If self diagnostics does not identify a faulty module you can perform these manual tests Five different fault conditions are addressed The following numbered list describes each type of fault condition Following that are troubleshooting tests to do for each type of condition 1 Fault at power up STANDBY and FAULT indicators lit 2 Normal at power up STANDBY indicator ON but trips out when trying to enter voltage standby mode VOLTAGE MODE indicator momentarily lights then STANDBY and FAULT indicators light 3 Normal at power up STANDBY indicator ON and ACV STANDBY ACV and STANDBY indicator ON but trips out when trying to enter ACV OPERATE Normal at power up but trips out when entering current standby Normal at power up and CURRENT STANDBY but trips out when entering current operate 7 6 Troubleshooting Manual Tests for Fault Isolation Problems 1 or 2 Fault at Power Up or When Entering Voltage Standby 7 5 Proceed as follows to isolate the problem in these conditions 1 Ifthe 5700A is reporting a fault determine if it is an analog monitor fault from Table 7 2 If the fault is not in Table 7 2 skip to step 2 See Table 7 1 for explanations of fault codes Table 7 2 Analog
198. tage Standby 3 8 uccnnrp 2 sober NO OUTPUT p sm cas Ez si OUTPUT SENSE CURRENT VOA VOA OUTPUT VOLTAGE MODE NO WIDEBAND 7 8 9 stanpsy OUTPUT 4 5 6 J J FAULT CABLE OFF og AUX GUARD GROUND CURRENT I J aq9i eps Voltage standby mode is when both VOLTAGE MODE and 5725A STANDBY indicators are lit In voltage standby mode the 5725A is not supplying an output Voltage standby occurs if 5725A is selected in a 5700A setup menu as the voltage amplifier and the next two conditions are true e voltage 220V or above is showing on the 5700A Output Display with the STANDBY annunciator lit e The BOOST indicator on the 5700A is lit Note If condition 1 is true the BOOST indicator can be toggled on and off by pressing the 5700A BOOST key If the BOOST indicator is off the 5725A is in standby mode not voltage standby Operating Notes 3 5725A Operating Functions and Modes Current Standby 3 9 REAN MM 50000 BOOST NO OUTPUT Lit OPR Srey EXSNS wBND BOOST WIDEBAND 7 8 gt CURRENT OUTPUT VOLTAGE MODE NO CURRENT MODE 5725A STANDBY OUTPUT m OVERLOAD CABLE OFF HI LJ AUX GUARD GROUND CURRENT 0 aq10i e
199. that interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one of more of the following measures Reorient the receiving antenna e Relocate the equipment with respect to the receiver e Move the equipment away from the receiver e Plug the equipment into a different outlet so that the computer and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 00345 4 Declaration of the Manufacturer or Importer We hereby certify that the Fluke Model 5725A Amplifier is in compliance with BMPT Vfg 243 1991 and is RFI suppressed The normal operation of some equipment e g signal generators may be subject to specific restrictions Please observe the notices in the users manual The marketing and sales of the equipment was reported to the Central Office for Telecommunication Permits BZT The right to retest this equipment to verify compliance with the regulation was given to the BZT
200. the instrument toward the rear To access the High Voltage Amplifier assembly simply do the Initial Access Accessing the High Voltage Amplifier A3 Procedure This leaves the assembly in the service position Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector 6 12 Maintenance 6 Access Procedures Accessing the High Voltage Sense Assembly A6 6 12 Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply Line voltage comes directly to this assembly The High Voltage Sense assembly lays flat on the top of the instrument toward the rear Proceed as follows to access the High Voltage Sense assembly 1 Perform the Initial Access Procedure 2 Return the High Voltage Amplifier assembly and the Current Amplifier assembly if it has been accessed to the normal position and reinstall the assembly retaining screws Note When reinstalling assemblies lower them in place squarely to make sure their connectors seat correctly in the Interconnect assembly connectors Turn over the 5725A so that the bottom is facing up Remove the bottom cover by removing the six screws on the bottom surface Remove the two jack screws from the 5700A subminiature D connector
201. the same result the CPU trips the Current Amplifier into standby and reports this condition to the 5700A A soft start from standby to operate transitions reduces sudden current changes This allows the 5725A to drive inductive loads such as power meters and clamp on type current probes Operation in the 11A AC Range 4 6 For ac current operation input to the 5725A comes from the 5700A Oscillator The 5700A Oscillator is configured for the 2 2V ac range with sensing back to the 5700A Oscillator coming from the current shunt through the calibration amplifier circuit on the Current Assembly Voltage and Current Standby Modes 4 7 When a change in output function is selected the 5725A goes through voltage or current standby mode before connecting the output to the 5725A binding posts or to the 5700A Voltage or current standby allows for local sensing within the 5725A and for establishment of a known input condition in current and ac voltage Voltage Standby 4 8 In voltage standby the 5700A binding posts are completely disconnected from the rest of the instrument circuitry and the 5725A high voltage output and sense lines B OUT B SENSE are disconnected from the 5725A 5700A connector The High Voltage Amplifier remains powered from the high voltage supply but its input is grounded by pulling CLAMPD and its output MV OUT is disconnected from the output transformers Analog monitor circuitry continues to check the
202. this problem Functional Summaries by Assembly 4 13 For an overview of all the assemblies in the 5725A and the functions contained on each refer to Figure 4 1 the overall block diagram and the following list Interconnect Assembly A1 e Connectors and traces to link other assemblies and fan e High voltage transformer secondary switching circuitry Power Supply Assembly A4 Rectifiers for high voltage supplies Filters for high voltage supplies High voltage current limit circuitry High voltage supply monitoring circuitry Rectifiers for system supplies Filters for system supplies Regulators for system supplies Rectifiers for fan supply Filter for fan supply Digital Assembly A5 e LED front panel status annunciators e CPU RAM ROM EEROM watchdog timer logic Current Amplifier Assembly A2 Transconductance amplifier Current shunt Heat sink and current power devices 5700A current routing circuits Filters for high current supply Rectifier bridge for high current supply Regulators for low current supply Current heat sink temperature monitor Theory of Operation 4 Detailed Circuit Description e High Voltage Power Amplifier Assembly A3 e Power amplifier e Harness to heat sink and its high voltage power devices e Connections to the output transformers e High voltage heat sink temperature monitoring circuitry High Voltage Sense Assembly High voltage sense attenuator and calibration ci
203. to uncertainty specifications that does not apply unless burden voltage is greater than 0 5V For higher loads multiply uncertainty specification by 0 1 x actual load 1 maximum load for full accuracy 5 57004 compliance limit is 2V for outputs from 1A to 2 2A 5725A Amplifier may be used range lock mode down to 0A Minimum output 0 for all ranges including 5725A Settling time to full accuracy 1 second for and mA ranges 3 seconds for 2 2A range 6 seconds for 11A range 1 second for range or polarity change Overshoot lt 5 5725A Instruction Manual AC Current Absolute Uncertainty 5 C from calibration temperature Relative Uncertainty Frequency Resolution For fields strengths gt 1 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ppm output nA ppm output nA 10 20 650 30 700 30 750 30 800 30 450 30 500 30 20 40 350 25 380 25 410 25 420 25 270 25 300 25 220 uA 1 40 1k 120 20 140 20 150 20 160 20 110 20 120 20 1 5 500 50 600 50 650 50 700 50 450 50 500 50 5k 10k 1596 100 16 100 17 100 18 100 14 100 15 100 10 20 650 50 700 50 750 50 800 50 450 50 500 50 20 40 350 40 380 40 410 40 420 40 270 40 300 40 2 2 10 40 1k 120 40 140 40 150 40 160 40 110 40 120 40 1k 5k 500 500 6
204. ttenuator circuits to produce the desired output Active assemblies in the 5725A ac voltage function are as follows In the 5700A CPU DAC Oscillator Oscillator Control High Resolution Oscillator Switch Matrix Motherboard Rear Panel assemblies In the 5725A CPU High Voltage Amplifier High Voltage Sense Signal Transformer Power Supply Digital and Interconnect assemblies When an ac voltage in the 220 to 1100V range is selected the 5700A calls the 5725A amplifier and leaves its own high voltage amplifier dormant The 5725A takes over the 1100V ac range automatically The 5725A produces ac voltage in the following sequence 1 The 5700A sets the Oscillator assembly to the proper frequency and amplitude The 5700A sets the initial amplitude using an 8 bit resistive hybrid dac located on the Oscillator amplifier assembly yielding an Oscillator output accuracy of about 0 5 Next the 5725A Power Amplifier amplifies this signal by 100 and returns an accurately attenuated signal to the 5700A The 5700A thermal sensor and adc analog to digital converter monitoring system fine tune the Oscillator amplitude The DAC assembly output is switched directly to the Oscillator assembly controlling the dac output amplitude AC voltage calibration constants stored in the 5725A determine the 5700A DAC voltage setting 4 5 5725A Instruction Manual The 5700A 5725A system uses the following method for ac amplitude control 1 A
205. u Qe OVERLOAD CABLE OFF HI Q 1 2 3 k AUX GUARD GROUND CURRENT gt M aqlli eps Warning Both the 5700A and 5725A can produce fatal voltages boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A during voltage operation the potential risk of injury or fatal accident is greater than during normal operation Voltage operate mode is when only the VOLTAGE MODE indicator is lit In voltage operate mode amplified voltage output is available at the 5700A binding posts Voltage operate occurs if 5725A is selected in a 5700A setup menu as the voltage amplifier and the next two conditions are true e ac voltage 220V or above is showing the 57004 Output Display with the OPERATE annunciator lit e The BOOST indicator on the 57004 is lit Note If condition 1 is true the BOOST indicator can be toggled on and off by pressing the 5700A BOOST key If the BOOST indicator is off then the 5725 is in standby mode Note Under certain settings of ac voltage especially high voltage between I to 5 kHz a whine from the 5725A is audible This originates from the output transformer and is normal Operating Notes Conditions That Activate the 5725A Current Operate 3 11 T CURRENT ASL OUTPUT BOOST HERE UT CURRENT OUTPUT VOLTAGE MODE NO OUTPUT WIDE
206. unts to 30 MHz Overload protection A short circuit on the wideband output will not result in damage After settling time normal operation is restored upon removal Introduction and Specifications 1 Specifications General Specifications Warm Up time 2 X the time since last warmed up to a maximum of 30 minutes System installation Rear output configuration and rack mount kit available Standard interfaces 488 RS 232 5725 5205A or 5215A 5220A phase lock in BNC phase reference out BNC Temperature performance Operating 0 C to 50 C Calibration 15 C to 35 C Storage 40 C to 75 C Relative humidity Operating lt 80 to 30 C lt 70 to 40 C lt 40 to 50 C Storage lt 95 non condensing Safety Designed to comply with UL1244 1987 IEC 348 1978 IEC 66E CO 4 CSA 556B Guard isolation 20 volts EMI RFI Designed to comply with FCC Rules Part 15 Subpart J Class B VDE 0871 Class B Reliability MIL T 28800D para 3 13 3 Line Power 47 to 63 Hz 10 allowed about selectable nominal line voltage 100V 110V 115V 120V 200V 220V 230V 240V Maximum power 5700A 300 VA 5725A 750 VA Electromagnetic Compatibility This instrument is designed to operate in Standards Laboratory environments where in electromagnetic is highly controlled If used in areas with RF fields gt 0 78 V m there could be errors in measurements Size 5700A Height 17 8 cm 7 in standard rack increment
207. voltage operation The 5725A has five normal modes of operation including active output in its three output functions ac voltage dc current and ac current The five normal operating modes are Standby also referred to as dormant on the schematics Voltage Standby Current Standby Voltage Operate Current Operate Each normal operating mode is described in the following paragraphs For the meaning of FAULT OVERLOAD or CABLE OFF indications refer to Table 3 1 Standby NO OUTPUT CURRENT OUTPUT VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT OVERLOAD CABLE OFF NO OUTPUT 3 7 BOOST GUARD GROUND OFF OPR STBY EX SNS EX GRD W BND BOOST Ee pen oe Enea Ex es aq8i eps Standby mode is when only the 5725A STANDBY indicator is lit In standby mode the 5725A is not supplying an output However the 5700A depending on how it is set can be supplying up to 1100V or 2 2A Standby occurs under any of the following conditions At power up with no pending 5725A entry on the 5700A When the 5725 is not selected in a 5700A setup menu as the amplifier for the 5700A output function in use and the 57254 is not selected as the output location for all 5700A current 3 9 5725A Instruction Manual Vol

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