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39/41B - Advanced Test Equipment Rentals

1. 5 52 nein 2 2 SU Se 3H E s99 OY sm gp 597 5 z 120 gj 614 ral E 692 B 82n R M 652 EG 5 sil Re feas 65 mae kur z 924 v7 520 I um old Ten 25 S 2 51 m DEM En 9925 Ery POST o C B s s 5 Z ggm g o e L84 998 23 3 E tj 52 dE ra m 82 rg Len Jakez era E F Lry He L R o L x M Ez e om lt gt 62 282 N N 5 PU 3 R N NR Bo 5 ale FLUKE 39 4001 Sheet 2 of 2 t12f eps Figure 6 2 Fluke 39 A1 Main cont 6 12 List of Replaceable Parts Parts Lists 6 Table 6 3 Fluke 41B Final Assembly Reference Designator A1 BT1 4 H1 H21 J1 J2 MP1 MP2 MP3 4 5 10 6 7 8 MP9 MP11 MP12 MP13 MP19 MP20 MP27 MP31 MP32 MP37 MP40 S1 TM
2. vss U17 Pin 4 6 PWR_SW2 R87 Pin 2 m tn R26 Pin 1 025 Pin 7 BBB 2 EH BER pon ait 010 E B ag Bes z Fl E agg N ia RA 012 x A o 8 H arn Rl CRY a 8 B i 22 Vdc STEM U25 Pin 4 Reset Q3 coll Figure 5 1 Test Point Locator t9f eps Troubleshooting Troubleshooting the Power Supply 5 4 Troubleshooting the Power Supply After pressing 9 check the power supply voltages against the supply range values in Table 5 2 If the power supplies do not come on the problem could be with the power on circuit itself The following technique can be used to force the power supply on even when the DSP or power on circuit is defective Refer to Figure 5 1 for test point locations in the following steps 1 To ensure the Tester is not drawing too much current remove the batteries and connect a 5 volt supply that indicates supply current between and VBT 2 Turnon the power supply If the current draw with the Tester power off is greater than 0 5 mA check the power supply capacitors C48 and C61 for shorts 3 Short SW1 and SW2 together with a jumper while monitoring the amp meter on the supply If the current draw exceeds the High Limit
3. g R27 2 C a l C9 E jen Bre D E21 R86 R87 sa TF amp Oe moos B U31 sa eos pud e a E32 e Er A CRS Figure 6 4 Fluke 41B A1 Main PCA R24 RT R53 R58 R43 R50 R48 E53 R34 Ne 6 20 List of Replaceable Parts 6 Parts Lists 199 97 ET 28 2 zul B Burg 09 viz 1 uis U23 R11 Ez S m U29 R76 C60 R71 50 i L R31 paa E41 MSs am em ce D JRa2 iz O mi ie 9 4 R12 a i D DO 939 EUR zr O T 21 FLUKE 41 4001 Sheet 2 of 2 t15f eps Figure 6 4 Fluke 41B A1 Main PCA cont 6 21 39 41 Service Manual 6 22 Chapter 7 Schematic Diagrams Title Page 1 Main PCA Fluke 39 and 41B 7 1 39 41 Service Manual 7 2 Schematic Diagram
4. Reassembling the Case Bottom Introduction Required Equipment Performance Tests Warming Up the Checking the Display Pixels Testing Voltage Performance Testing Amps Performance Testing Watts VA VAR Testing Record Mode Performance Testing Memory Mode Performance Model 41B Only Testing Harmonics Volts Performance Testing Harmonics Amps Performance Testing Serial I O Performance Model 41B Only Calibrating the Tester Introduction Entering Calibration Mode Making Calibration Adjustments Exiting the Calibration Mode Setting the Minimum Contrast Level ii Contents continued Troublesho ting ur une 5 1 kin nein 5 2 General Troubleshooting esee rennen 5 3 Starting with a Dead Tester Model 41B Only 5 4 Troubleshooting the Power Supply serene 5 5 Troubleshooting the Digital Section serene 5 6 Troubleshooting the Digital Kernel 424440221 5 7 Troubl
5. VREF FLUKE 4X 1021 5 of 6 Figure 7 1 A1 Main PCA Fluke 39 and 41B cont 39 41 Service Manual 511 510 59 LEFT ARROW RIGHT ARROW CONTRAST 6 c o S6 S8 WV HM TX PHASE REF S2 SMOOTH Lo 514 MEMORY o S12 ON OFF KEYS PRINT SEND AND MEMORY ON MODEL 41 ONLY FOR REFERENCE ONLY Figure 7 1 A1 Main PCA Fluke 39 and 41B cont FLUKE 4X 1021 6 of 6
6. ce 3 218 N N EL 5 wy NJ Sy 5 2 a 229 Q 50 9194 5 3 CZy 752 ORB TNE i ven 292 194 as Bez a re 192 51 5 ie 85 Try Br R red os 099 94 E Ko 62n 2 x d 5 E E i gt org TS 58 Tru Or wi sin zin L6n BEJ D Bm N 1 BP2 FLUKE 39 4001 Sheet 1 of 2 1111 Figure 6 2 Fluke 39 A1 Main 39 41 Service Manual
7. MO NNSYO 2715128 DSI OSO DSO DSCK OST DH HESET ___ CS EEPROM EEPROM MEM IMAGE ATOD EE CR2 PS 0 E gt Eo CR3 MBD301 MBD301 DS A A TROA 0 lt 23 0 gt Wi EE UPLOW CS BOOTROM RD 5 BOOTROM A15 IPS ola 0000 PIPMIEJS ES MT5LC2568DJ 25 119 12 121 52 50 26 RXD PCO 25 MODEC NMI MODEB IROB DR 050 05 050 53 DSCK OS1 SCLK PC2 28 TXD PC1 616P Ut DSP56L002 A10 Att U2 A12 A13 WE TE 14 X10B AMP A15 SCO PC3 SC1 PC4 SC2 PC5 L LOW ___ SCK PC6 SRD PC7 DOU DSPCLOCK STD PC8 8 R4 R5 4 14 TIREGPB13 123 CKOUT 126 128 1 HR W PB11 CS GAIN 10 HEN PB12 5 SRAM 15 A14 IDS A15 IPS 24 HO PBO 23 H1 PB1 21 H2 PB2 19 H3 PB3 18 H4 PB4 17 H5 PB5 15 H6 PB6 14 H7 PB7 7 8 6 HA
8. Service Manual 2 25 2 26 2 27 2 28 Digital Kernel The digital kernel consists of a digital signal processor a programmable logic device PLD ROM and RAM It processes the input signals from the a d converters computes the values and waveforms and stores the data in RAM for the display Digital Signal Processor U2 The DSP56002 processor DSP has full control of all hardware in the Tester It controls a d sampling computations serial interface user interface and the display The DSP has several I O ports that can be configured in a number of different ways Two of these ports are for serial communications The Fluke 41B makes use of one serial port for RS 232 communication to printers or PCs over a special optical interface and cable The second serial port is used by both models to communicate to the two a d converters U14 and U15 and the serial EEPROM U22 The other I O ports are used for various control and sensing keypad interface power control low battery sense and memory bank switching This DSP unlike most common microcontrollers is optimized for calculations instead of control The data bus is 24 bits wide All internal data registers are 24 bits except two accumulators which are 56 bits wide There are three 64K address spaces that share the same external address and data bus The three address spaces are Program X data and Y data Code can only be executed from the program space but data
9. Stoc Tot Qty Designator No wi CABLE FLAT JUMPER 24COND 039SP 1 30 936992 1 XBT1 XBT2 CONTACT BATTERY 936752 2 NOTES 1 ACCESSORY PACK INCLUDES THE FOLLOWING ITEMS MP1 TEST LEAD SI R A STRT BANANA RED TL24 927798 1 MP2 TEST LEAD SI R A STRT BANANA BLK TL24 927793 1 MP3 PROBE TEST BANANA JACK RED TP20 927777 1 MP4 PROBE TEST BANANA JACK BLK TP20 927772 1 MP5 CLIP ALLIGATOR BANANA SAFETY RED AC20 927582 1 MP6 CLIP ALLIGATOR BANANA SAFETY BLK AC20 927579 1 2 ACCESSORY PACK RS232 INCLUDES THE FOLLOWING ITEMS W1 CABLE RS232 936872 1 CP1 ADAPTER D SUB 9 PIN KD SUB 25 SCKT 929187 1 CP2 ADAPTER D SUB 25 PIN D SUB 25 PIN 867940 1 Notes Parts Lists 6 List of Replaceable Parts SEE VIEW B BLACK J2 SEE VIEW A MP5 MP19 XBT1 2 H21 6 PL BT1 4 FLUKE 41B T amp B Figure 6 3 Fluke 41B Final Assembly 6 15 39 41 Service Manual 6 16 Table 6 4 Fluke 41B 1 Main PCA Reference Designator C1 C6 C2 C3 C73 C4 C5 C7 C13 C15 C16 C18 C20 24 C26 32 C36 C37 C39 C40 C42 C44 C48 C55 C56 C58 C59 C62 C8 C9 C10 C11 C12 C71 C14 C19 C17 C25 C33 C34 C35 C38 C41 C43 C50 C54 C60 C45 C46 C47 C49 C53 C51 C52 C68 C57 C61 C67 C70 C63 C72 C64 66 C69 C74 C75 CR1 5 CR8 CR9 CR2 CR3 CR4 CR6 Description CAP CER 750PF 1 50V C0G 0805 CAP CER 1000PF 1 50V C0G 1
10. Active W VA 1 00 mV A to 1400 mV rms A ac dc 1 0 mV A to 2000 mV A 0 5 3 digits 6 65 Hz probe specs 2 4 digits probe specs 1 MQ 47 pF gt 3 0 below 600 mV 2 0 1000 mV 0 W VA to 600 kW kVA average 0 W VA to 2000 kW kVA 1 4 digits probe specs Harmonics Measurement Accuracy Cursor Data Harmonic Level gt 5 Using Smooth 20 Volts Fundamental to 13th Harmonic 13th to 31st Harmonic Amps or Watts Fundamental to 13th Harmonic 13th to 31st Harmonic 20A 3 digits Phase Fundamental 2nd to 31st Harmonic 2 2 digits 13th 2 2 digits 31st 8 2 digits 3 3 digits probe specs 13th 3 3 digits probe specs 31st 8 3 digits probe specs 2 degrees probe specs 2nd 5 degrees 31st 20 degrees probe specs Frequency Measurement Accuracy Fundamental 6 0 Hz 99 9 Hz 6 0 Hz 99 9 Hz 1 6 50 3 Hz Introduction and Specifications Specifications 1 Other Measurement Specifications Measurement Function Input Bandwidth 0 5 dB 20 Power Factor Total Harmonic Distortion THD F THD R Ranges and Resolution Crest Factor CF Using Smooth Power Factor Displacement PFD Phase Measurement Range K Factor KF Range Model 41B AC Volts pos Resolution jeg 20V
11. Table 6 2 Fluke 39 A1 Main PCA Reference Designator C1 C6 C2 C3 C73 C4 C5 C7 C13 C15 C16 C18 C20 24 C26 32 C36 C37 C39 C40 C42 C44 C48 C55 C56 C58 C59 C62 C8 C9 C14 C19 C17 C25 C33 C34 C35 C38 C41 C43 C50 C54 C60 C45 C46 C47 C49 C53 C51 C52 C68 C57 C61 C67 C70 C63 C72 C64 66 C69 C71 C74 C75 CR2 CR3 CR4 CR5 CR8 CR9 CR7 CR10 Description CAP CER 750PF 1 50V C0G 0805 CAP CER 1000PF 1 50V C0G 1206 CAP CER 1000PF 1 50V C0G 1206 CAP CER 100PF 1 50V C0G 0805 CAP CER 0 1UF 10 25V X7R 1206 CAP CER 100PF 1 50V C0G 0805 CAP CER 8200PF 20 50V X7R 0805 CAP CER 750PF 1 50V C0G 0805 CAP CER 20PF 10 50V C0G 1206 CAP CER 47PF 10 1000V C0G 1808 CAP CER 0 1UF 10 25V X7R 1206 CAP TA 1UF 20 35V 3528 CAP TA 1UF 20 35V 3528 CAP CER 0 01UF 20 100V X7R 1206 CAP CER 330PF 5 50V C0G 0805 CAP CER 0 22UF 80 20 50V Y5V 1206 CAP CER 0 015UF 20 50V X7R 0805 CAP TA 100UF 20 10V 7343 CAP TA 220UF 20 6V 7343H CAP TA 10UF 20 16V 6032 CAP CER 0 22UF 80 20 50V Y5V 1206 CAP CER 470PF 10 50V C0G 1206 CAP CER 47PF 10 50V C0G 1206 DIODE SI SCHOTTKY 30V SOT 23 DIODE SI SCHOTTKY DUAL 30V SOT 23 DIODE SI BV 70V I0 50MA DUAL SOT 23 DIODE SI 30 PIV 1 1 AMPS SCHOTTKY DIODE SI BV 75V I0 250MA SOT 23 FERRITE CHIP 60 OHM 9100 MHZ 1806 CONN FLAT FLEX 1MM CTR RT ANG 24 POS Fluke Stock No 867643 8
12. 0 30 90 30 40 75 40 50 45 Storage 90 Altitude Operating 10 000 feet 2 km Storage 40 000 feet 12 km Shock amp Vibration per MIL T 28800 class 3 sinusoidal non operating Electro Magnetic Compatibilty RF Emissions EN 50081 1 Commercial Limits VFG 243 1991 RF Susceptibility EN 50082 1 Commercial Limits Council Directive Electromagnetic Compatibility Directive 89 336 EEC Drip Proof and Dust Proof Case per IEC 529 Section 3 IP 52 Dust Protected Drip Proof Display Type Super Twisted Liquid Crystal Size 3 0 inch diagonal 76 mm Resolution 160 W x 128 H pixels Contrast User adjustable Backlight Yellow green LED 1 8 Introduction and Specifications 1 Specifications Safety Designed for 600V measurements on industrial power distribution circuits AN Overload Protection Voltage or Current Probe Input 600V maximum Surge Protection 6 kV per IEC 1010 1 Maximum Voltage Isolation to Earth 600V from any terminal Protection Levels IEC 1010 1 Pollution Degree 2 Installation Category Material Group 11 600V Protection Class Protection Class as described IEC 1010 1 Annex Double or Reinforced Insulation Waveform Memory Model 41B only Eight nonvolatile memories store a maximum of 2048 sampled points of waveform data for both voltage and current inputs for later recall or sending to a computer EIA 232 E RS 232 Interface Model 41B only Optically I
13. 1 A1 Main PCA Fluke 39 and 41B cont 39 41 Service Manual 1000PF d A AD820BR VDD 4 e 10 D820BR 09 092 5 13 g cs VCC SCK 7 T IN CLK i VS 1 ND DOU DOUT VOLTS zen 00 REF F DG444DY y R81 R80 y 47 10 C75 C74 U12 47PF 470PF VOLT T T 470 X2 VOLT X4 VOLT 1000PF 14K R38 R18 R23 1W 1W 1W X IN R76 DOUT_AMPS 7 0 R1 100 16 VREF 1 MMBT3904 U13 e 15 14 6 X Q7 DG444DY DG444DY U13 10 11 dc H U13 2 1 gt H O MMBT3904 DG444DY DG444DY 1 _ U12 DG444DY 3 V X10A AMP FLUKE 4X 1021 X1B_AMP 4 of 6 X10B AMP Figure 7 1 A1 Main PCA Fluke 39 and 41B cont 7 6 Schematic Diagrams 7 1 750 0610 Q10 MMBT6429 R44 NY PWR_ON MUN2213 R43 27K V LCD PWR VBT SW C56 5 100NF L R88 T WIPER 3 12 1 1 R63 100K V Q20 2 MMBT5087 200UH CR10 D 1 Q9 516 2 Q4 2N7002 C53 2N7002 8 TLC555CD VJ V U31 LM2936M IN OUT
14. CS EEPROM is changing states correctly when trying to read write a waveform to EEPROM The write timing to EEPROM should have similar timing with the RD signal replaced with the WR signal If the CS EEPROM pulse is not generated verify that all of the correct signals are present U3 A15 A14 A5 4 RD WR XY PS If all signals are present and you still do not have a correct CS EEPROM signal U3 may be defective 0 ns 100 ns 200 ns 300 ns J li l d CLOCK Z V SEL y ou Ve A 6 20 Min Max 263 15 Min Max A0 A15 DS Address Bus DS PS XY PS X Y 15 Min Max CS EEPROM 250 Min Max 15 Min Max E a i 285 46 Min Max ids ee 100 Min Max J 0 281 96 gt DATA t20i eps 3 Finally if there are no solder problems with U11 all address and data lines are properly connected and the timing of the signals to U11 is correct but the data written to U11 is not read back properly U11 may be defective 39 41 Service Manual 5 11 Troubleshooting the LCD Display Module To isolate a problem when the LCD display appears dead do the following 1 First verify that the display module is properly connected to the main circuit board Make certain that the flex cable is not twisted or at an angle as it enters the molex connector of either the LCD module or the mai
15. ER Examine Max Avg and Min screens for correct readings according to Table 4 4 Note No VAR KVAR in record mode Performance Testing and Calibration 4 Performance Tests 4 10 Testing Memory Mode Performance Model 41B Only 1 Using the equipment setup from the previous performance test apply the last set of values from Table 4 4 to the Tester 2 Press wv 3 Using D and 3 Clear store and recall the waveform in memory 4 11 Testing Harmonics Volts Performance Note Make sure that the unit is set to THD RMS before performing this procedure Press until the harmonics screen is displayed on the Tester Press 4 until is displayed above the upper right corner of the harmonics display Press until A is displayed in the top status line of the Tester Press until 3 206 is displayed in the top status line of the Tester p cepe Connect the calibrator NOTMAL output to the V and COM connectors on the Tester e Connect the calubrator AUX output to the Current Probe connector on the Tester Set the calibrator output to 7 0V at 50 or 60 Hx on the NORMAL output and 700 mV at the same frequency on the AUX output Press the WAVE MENUS softkey and ensure the phase angle is 10 0 degrees Press the HARMONIC MENU softkey and ensure the HARMONIC selection is set to 1 and the FUNDMTL selection is set to aux the Press OPR 8 Move the Tester cursor to the correspondin
16. Meter and 41B Power Harmonics Analyzer 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 6 2 How to Obtain Parts Electrical parts may be ordered directly from the manufacturer by using the manufacturer s part number or from the Fluke Corporation and it authorized representatives by using the part number under the heading FLUKE STOCK NO In the U S 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 a 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 e Instrument model and serial number Quantity Reference designator Part number and revision level of the pca c
17. No 782573 830489 944645 929893 811539 742676 912469 927538 942540 742676 867606 942912 820910 912469 742684 746644 746644 867085 867437 929906 876524 769281 746628 746644 867437 929906 876524 740548 740548 740548 746610 944244 746610 929922 929901 867291 746016 Tot Qty Notes 6 17 39 41 Service Manual 6 18 Table 6 4 Fluke 41B A1 Main PCA cont Reference Designator R27 R28 R32 R45 R29 R31 R33 R70 R84 R36 R37 R39 R41 R42 R43 R46 R47 R48 R49 R50 R52 R53 R54 R56 R57 R58 R59 R80 R61 R62 R64 R65 R67 R68 R69 R71 R76 R72 R74 R77 R81 R82 R86 R87 Description RES CERM 1K 5 125W 200PPM 1206 RES CERM 1K 1 125W 100PPM 1206 RES CERM 464K 1 125W 100PPM 1206 RES CERM 510K 5 125W 200PPM 1206 RES CERM 0 05 MAX 125W 1206 RES CERM 150 1 125W 100PPM 1206 RES CERM 47K 5 125W 200PPM 1206 RES CERM 4 7K 5 125W 200PPM 1206 RES CERM 10 5K 1 125W 100PPM 1206 RES CERM 200 1 125W 100PPM 1206 RES CERM 27K 5 125W 200PPM 1206 RES CERM 620K 5 125W 200PPM 1206 RES CERM 6 98K 1 125W 100PPM 1206 RES CERM 17 8K 1 125W 100PPM 1206 RES CERM 24 9K 1 125W 100PPM 1206 RES CERM 29 4K 1 125W 100PPM 1206 RES CERM 37 4K 1 125W 100PPM 1206 RES CERM 20K 1 125W 100PPM 1206 RES CERM 3 3 5 125W 400PPM 1206 RES CERM 1 33K 1 125W 100PPM 120
18. Table 4 4 Enable the Phase Lock mode on calibrator Using the Phase Shift function on calibrator A adjust the phase to within 0 5 degrees of the phase shift specified in Table 4 4 Press until W is displayed in the upper right had corner Press until the Tester is in the Text Screen mode Verify that the W KW VA KV A and VAR KVAR readings are within the minimum and maximum limits specified in Table 4 4 Press until the Tester is in the Harmonics screen mode Verify that the fundamental frequency phase angle readings are between the minimum and maximum readings listed in Table 4 4 Table 4 4 Watts Performance Line Frequency Calibrator Output Performance Limits W kW VA kVA VARS kVARs Phase Volts Phase Amps mV 5 00 0 00 30 00 144 156 144 156 0 4 2 2 8 00 0 00 30 00 233 247 233 247 0 4 2 2 100 00 157 00 150 00 14 3 13 2 144 15 6 5 4 6 4 155 159 100 00 157 00 360 00 37 28 81 41 10 19 155 159 10 00 46 00 1300 00 8 5 9 6 12 4 13 6 8 8 9 9 44 48 100 00 46 00 1300 00 85 96 124 136 88 99 44 48 4 9 Testing Record Mode Performance 4 8 The equipment setup from the previous performance test apply the last set of values from Table 4 4 to the Tester 2 Press and then
19. The Tester displays a uniform checkerboard pixel pattern Visually check the pixel pattern for missing pixels When done release 9 and the Tester will start normal operation If the display is not at a viewable level change the contrast setting to a normal level and repeat Note The following procedures are based on using two calibrators a phase meter and a dual channel signal generator Other test equipment configurations may require some adjustments in the performance tests and calibration procedures described in this chapter Testing Voltage Performance Perform the following procedure to test the voltage function of the Tester Warning Ensure that the calibrator is in standby mode before making any connection between the calibrator and Tester dangerous voltages may be preSent on the leads and connectors 1 Connecta cable from the Output Voltage HI and LO connectors of calibrator to the V and COM connectors on the Tester Press until the text screen is displayed Press 2 until V is diplayed the upper right corner of the display Press until V is displayed in the top status line of the Tester Set the output of calibrator A to the Calibrator Output values in Table 4 2 DC voltages are listed in the upper section of the table and AC voltages at 50 or 60 Hz whichever is your local line frequency are listed in the lower section of the table Blank fields do not need to be evaluated QM oc PE Note Apply
20. Voltage HI and LO connectors of calibrator A to the Current Probe connector on the Tester Tap Se Press until the text screen is displayed on the Tester 6 Press until A is displayed in the upper right corner of the display 4 5 39 41 Service Manual Variable Phase Out Phase Lock In Calibrator Calibrator 5V 100V ac 30 mV 1 4V ac Output HI O o Output O DLO O Qr XO Q US MAN 100 0 1 7 9 99 COSCO 26 186 C 1 _ I135 791885 gt ENTER Phase Meter Signal Ref t5c eps Figure 4 1 Watts Performance Test Configuration 4 6 Performance Testing and Calibration Performance Tests 4 7 Press until A is displayed in the top status line of the Tester 8 Setthe output of calibrator A to the Calibrator Output values in Table 4 3 DC voltages are listed in the upper section of the table and AC voltages at 50 or 60 Hz whichever is your local line frequency are listed in the lower section of the table Blank fields do not need to be evaluated Note Apply the voltage incrementally so the Tester does not autorange to the next higher range Ensure the Tester is in the appropriate range before checking the r
21. Warning Service procedures in this chapter should be performed by qualified personnel only To avoid electrical shock do not service this product unless you are qualified to do so Introduction This chapter provides handling cleaning disassembly and assembly instructions Warranty Repairs and Shipping Information If your Tester is still under warranty see the warranty information at the front of this manual for instructions on returning the unit The list of authorized service facilities is included in Chapter 6 General Maintenance Information Required Equipment Equipment required for calibrating troubleshooting and repairing the Tester is listed in Chapter 4 Table 4 1 Static Safe Handling integrated circuits including surface mounted ICs are susceptible to damage from electrostatic discharge ESD Modern integrated circuit assemblies are more susceptible to damage from ESD than ever before Integrated circuits today can be built with circuit lines less than one micron thick allowing more than a million transistors on a 1 4 inch square chip These submicron structures are sensitive to static voltages under 100V This much voltage can be generated on a dry day by simply moving your arm person can develop a charge of 2 000V by walking across a vinyl tile floor and polyester clothing can easily generate 5 000 to 15 000V during movement against the wearer These low voltage static problems are often undetected b
22. a transition from low to high in less than 150 ms when is pressed or when the power supply is up to 3 3V A checksum line that fails to make this transition indicates the program was not loaded properly from the EPROM into SRAM This could indicate a problem with an address line data line control line RD WR DS PS x y or EE UPLOW line that is not high at reset or it could indicate that U2 through U7 is faulty or has a bad solder joint Check that W DOG U2 35 or the side of C57 not tied to R77 changes state at least once every second For certain areas of code such as in the user interface it may change state at a significantly higher rate The minimum width of the W DOG pulse is 15usec If the W DOG signal does not appear and the DSP is running with the CKSUM OK line high then U2 may be bad Check the DSP CLOCK signal U2 123 or U3 43 with a high speed oscilloscope A clock frequency of 38 6918 MHz should be observed If this clock signal is not present verify that the oscillator circuit tied to U2 1 and U2 132 is correct The crystal frequency is 3 86918 MHz The DSP chip multiplies the crystal frequency by 10 to produce the DSP clock frequency The reset line U2 125 should go high approximately 20 ms after the DSP chip sees 3 3V on its Vcc pins If this does not occur check the power supply and the reset circuit Check that MODE C U2 119 is low when reset U2 125 goes from low to high If it is not low check that dio
23. adjust correctly proceed as follows 1 Press the arrow keys to verify that when entering contrast the WIPER on the EEPOT 08 5 can be moved between the top wiper voltage U8 3 of 3 3V and the bottom wiper voltage U8 6 of 0V The right arrow moves the wiper toward the top wiper voltage or increases the contrast and the left arrow moves the wiper toward the bottom wiper position or decreases the contrast The newly selected value of contrast does not get saved unless you specifically exit the contrast feature by pressing 6 For example if the Tester is in the contrast mode and you turn the power off the contrast setting will not be saved as the new contrast of the display If moving the WIPER through its range of values does not change the contrast of the display there may be a problem with the analog contrast circuit or a problem with the LCD module Troubleshooting Troubleshooting the Digital Section 2 Verify that U3 is producing the correct INC EEPOT and CS EEPOT signals as shown in the following timing diagram EE UPLOW 08 2 controls the direction that the WIPER will move CS EEPOT 08 7 selects the EEPOT When the CS EEPOT signal goes from low to high thus deselecting the EEPOT the present value of the EEPOT is saved to nonvolatile memory and will be used as EEPOT s default value upon receiving power Once the EEPOT is selected INC EEPOT U8 1 is pulsed low to increment decrement the wiper position in accordance w
24. and Styrofoam objects outside the work area 2 Store and transport all static sensitive components and assemblies in static shielding bags or containers Static shielding bags and containers protect components and assemblies from direct static discharge and external static fields Store components in their original packages until they are ready for use Cleaning Warning To avoid electrical shock or damage to the tester never allow water inside the case To avoid damaging the tester s housing never apply solvents to the meter When the Tester requires cleaning wipe it with a cloth that is lightly dampened with water or a mild detergent Do not use aromatic hydrocarbons chlorinated solvents or methanol based fluids when wiping the Tester Disassembling the Tester The following paragraphs describe how to disassemble the Tester to the pca level Start and end your disassembly at the appropriate heading levels Caution Always remove the case bottom first to avoid damaging the Tester Removing the Meter Case Bottom Perform the following procedure to remove the case bottom Figure 3 1 1 Make sure the Tester is disconnected from any live source turned off and all test leads are removed from the input module 2 Remove the two slotted screws on the battery cover one is located under the hook and remove the cover 3 Remove the batteries Remove the six Phillips screws from the case bottom Insert a thin non sharp
25. be dressed so they bend outward toward the side of the case and are not between the pca and the plastic cylinders of the input module 3 14 Reassembling the Case Bottom 1 Align the bottom edge of the input module with the sealing groove on the case bottom While ensuring the input module remains squarely within the side walls of the case bottom press the case bottom onto the input module until it seats snugly against the top edge of the case bottom If the case bottom gets cocked at an angle to the sides of the input module the case top and case bottom will not come together properly Make sure the case bottom and case top are firmly pressed together The gap width on either side of the instrument between the case bottom and case top should be approximately equal Reinstall the six Phillips screws into the case bottom Reinstall the batteries and fasten the battery cover in place using the two slotted screws 3 7 39 41 Service Manual 3 8 Chapter 4 Performance Testing and Calibration Title 4 1 Introduction sed 4 2 Required 4 3 Performance Tests u een 4 4 Warming Up the Tester 4 5 Checking the Display Pixels eene 4 6 Testing Voltage Performance 4 T Testing Amps Performance essere 4 8 Testing Watts VA VAR Pe
26. can be stored and retrieved from all three address spaces The control lines DS PS and X Y from the DSP control which of these three address spaces are accessed Although this may sound a bit complex with the three address spaces you could think of the PS and X Y signals as two more address lines A16 and A17 Programmable Logic Device A Programmable Logic Device PLD replaces several generic parts that usually consume more board space and power Much like a ROM these parts can be programmed into an almost limitless combination of circuits This makes them easy to use but sometimes hard to debug since they look like a black box from the outside In the case of the Fluke 39 41B U3 is broken into six relatively simple sections Several of the sections share common inputs Figure 2 2 is a block diagram of the internal circuits of the PLD Keypad Interrupts The four row signals RO 3 from the keypad are ANDed together If any of the signals drop below a valid high state IRQA is driven low This generates an interrupt to the DSP so that the software does not have to continually scan the keypad inputs until an interrupt is detected Theory of Operation 2 Circuit Descriptions RD DSPCLOCK LCD KEYPAD INTERRUPTS INTERFACE RO WR CS LCD A4 MEMORY RA13 A5 DECODE INC EEPOT A14 AND CS EEPOT A15 CS GAIN lE XE XY INTERFACE CS EEPROM DS CS BOOTROM PS CS SRAM SERI
27. location Y FFFO is read or written to clear the CS EEPOT which writes the value into the EEPOT Theory of Operation 2 Circuit Descriptions 2 34 2 35 2 36 2 37 2 38 2 39 2 40 SRAMs 05 06 07 The SRAM is used for two main functions operating code storage and sampled and calculated data storage After the Fluke 39 41B has completed its initialization and is running program execution is directly from one program section of the SRAM Storage of all sampled and calculated data is stored in the X and Y data spaces The 96 kilobytes 32 kilowords x 24 bits of static RAM is divided into three sections Program X data and Y data The Y data space uses 8K words X data space uses 8K words and Program space uses the remaining 16K words The first 0 5K word P 0000 1FF of Program space is on the DSP chip U2 EPROM U4 The EPROM contains the instrument software During start up 512 words 1536 bytes are read from the EPROM and then executed from within the internal DSP program RAM The remaining portion of the 16K words is downloaded into the program space of the SRAM After boot up the EPROM is not accessed again until the unit is powered up again Although U4 is an EPROM it cannot be reprogrammed since it is not a windowed part This type of EPROM is know as an OTP or One Time Programmable 011 The EEPROM U11 provides a nonvolatile storage of waveform and calculated data for the Mod
28. one bit pulse at the start of each A D word and it occurs at twice the sample rate of an A D converter e 02 31 labeled SCK Bit clock rate of the A D converters 5 7 39 41 Service Manual e SRD 02 38 labeled DOUT serial data received from the MUX in U3 When the instrument is collecting data in normal operation mode the above four waveforms can be observed with the following timing 241 824 Hz lt 420 62 ns Ly SRD i OC0000000020000000000000 SCO VOLTS AMPS When 5 0 is low SRD is the output of the volts a d converter and amps when high t18i eps Note When the instrument is in normal operation it will collect data for about 234 6 ms when the input frequency is gt 10Hz then process data for 80 ms with the process repeating With an input frequency lt 10Hz it will collect data for 469 2 ms then process data for 80 ms with the process repeating If SCO SC2 and SCK are not present and the Tester is collecting data in normal operation not in HOLD or memory mode powering on properly responding to key presses properly and displaying the correct screen the DSP U2 may be defective If SRD is not correct either the A D converters may not be generating DOUT
29. or U3 may not be producing the SRD signal correctly 2 Check for proper communication between U3 and the A Ds U14 and U15 U3 has four control lines to the a d converters 241 824 Hz see DOUT_VOLTS NyNYoYeYzYeYsYaYsY2Y3YoY1Y2YsY4YsYoY7eYoYNYNYN DOUT AMPS 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 CS r19i eps 5 8 Troubleshooting Troubleshooting the Digital Section 5 8 SCK U14 U15 13 and U3 20 A complemented version of SCK coming from the DSP chip CS AD U14 U15 1 U3 17 The chip select signal to the A Ds which causes the A Ds to sample and convert the result DOUT VOLTS 015 12 or 03 13 The serial data transmitted by the volts A D converter DOUT AMPS 014 12 03 11 The serial data transmitted by the amps A D converter Pins 13 and 11 on U3 should show a slightly attenuated version of pin 12 on U15 and U14 If this is not the case verify that the 1000 resistors R71 R76 are correct When the instrument is collecting data in normal operation mode the above four waveforms can be observed with the following timing If SCK and CS AD are both correct and present at the A D but the appropriate DOUT VOLTS DOUT 5 is not correct there is some problem with the front end possibly with the A D converter itself The
30. sample rate of the a d converters The filter is a 4 pole Butterworth consisting of a cascade of two second order low pass filters The filter has unity gain from DC to 2 015 kHz 40 2 dB The 3 dB point of the filter is at 3 5 kHz The filter should have 19 dB 0 5 dB of attenuation at 6 kHz Level Shifter 78 translates the input signal from a bipolar signal with full scale range of 2 volts peak to an unipolar signal that goes from 0 to 2 volts The output of the divider should be at one half of VREF when the input is at zero volts The resistors in Z8 are ratio matched to 0 1 with the resistor between pins 1 and 8 as the reference A D Converters The two a d converters are 10 bit successive approximation converters One measures volts and the other measures amps These parts use serial interfaces to communicate to the DSP through U3 s serial Multiplexer section When CS AD goes low the a d converter starts a conversion cycle CS AD stays low during each conversion cycle During the conversion cycle 12 bits are read by the microcontroller The a d converter sends the two Least Significant Bits twice The data is sent Most Significant Bit first The converter sample rate is 10 076 kHz and the clock rate is 241 824 kHz Resistor R71 is needed to limit the current between the a d converter and the microcontroller because the a d converter operates at 5 volts while the microcontroller operates at 3 3 volts 2 9 39 41
31. the battery access lid and batteries and return the battery shunt spring to its normal position Place a new calibration seal P N 937045 over the calibration access port to prevent unintentional entry into the calibration mode When the calibration seal is in place install batteries and reinstall the battery access lid Exiting the Calibration Mode Press to exit the Calibration mode If this button is pressed prior to completion of all calibration points no changes are made to nonvolatile calibration memory 39 41 Service Manual 4 19 Setting the Minimum Contrast Level A minimum contrast level needs to be set whenever an LCD module pca or the serial EEPROM U22 is replaced This setting provides a minimum useful level so that a user may not inadvertently set the screen blank 1 2 5 6 Press to put the Tester in contrast mode Use lt or D to set the display contrast to an optimum level dark characters with light background Press and hold for at least 5 seconds The contrast annunciator will turn off during the first second turn on for 3 seconds along with the backlight and then both will finally turn off Release the contrast button Correct limit setting can be confirmed by changing the contrast to as light as possible by pressing 5 and holding lt Exit contrast mode normally Turn the Tester off and on The LCD contrast will be light but visible 7 Return the Teste
32. 0 and 2000A N A N A N A 0 1 0 1 1 Logic High gt 0 2V and 0 Logic Low lt 0 8V 2 If the latches are correctly written there is a problem somewhere in the analog input circuits Refer to the analog theory for troubleshooting assistance If latch U1 is not written properly verify that C8 GAIN from U3 18 occurs when a range change is attempted Also the data should be on the appropriate latch input pins to be latched into the latch If the CS GAIN pulse is not generated verify that all of the correct signals are correctly feeding U3 A15 A14 A5 A4 RD WR XY PS If they are correctly feeding and you still do not have a correct CS GAIN signal U3 may be defective Alternatively if the CS GAIN signal is present to the UI latch but the correct data is not getting latched verify that the data bus feeding the latch contains the correct data on the rising edge of the CS GAIN pulse If the data bus does contain the correct data on the rising edge of CS GAIN but the data is not getting latched there is probably a defective latch U1 Troubleshooting Troubleshooting the Digital Section 5 10 Troubleshooting the EEPROM The EEPROM is used for waveform storage and is only installed on the Model 41B To isolate waveform storage problems proceed with the following 1 Verify that R82 and R84 are correct and installed Also verify that R83 and R85 are absent 2 Verify that
33. 0 1V 2A 50V 0 1V 5A 100V 0 1V 10A 200V 0 1V 20A 500V 1V 50A 1 kV 1V 100A 200A 500A 1000A 2000A Range Resolution DC 6 Hz to 2 1 kHz 1 00 to 5 00 0 00 to 1 00 0 00 to 0 29 0 30 to 0 69 0 70 to 0 89 0 90 to 1 00 179 to 180 degrees 0 0 to 799 9 0 03 x Reading 2 0 0 0 to 99 9 0 03 x Reading 2 0 AC Amps Watts Resolution Range Resolution PK 0 01 50W 1 0W 0 01A 100W 1 0W 0 01A 200W 1 0W 0 01A 500W 1 0W 0 1A 1 kW 0 01 kW 0 1A 2 kW 0 01 kW 0 1A 5 kW 0 01 kW 1A 10 kW 0 1 kW 1A 20 kW 0 1 kW 1A 50 kW 0 1 kW 100 kW 1 kW 200 kW 1 kW 500 kW 1 kW 1 kkW 1 kW 2 kkW 1 kW Accuracy Unspecified 50 04 50 03 50 02 see Phase above 39 41 Service Manual General Specifications Size 9 2 x 8 9 x 2 5 inches 234 x 100 x 64 mm Weight 2 0 165 1 kg Input Connectors Voltage 2 shrouded banana jacks 4 mm Current Probe 1 shrouded BNC jack Battery Type 4 Alkaline C Cells ANSI NEDA 14A IEC LR14 supplied Operating Time 48 Hours typical continuous without backlight Alternate Battery 4 NiCad Cells customer supplied and externally charged The Tester prevents battery reversal by turning itself off if battery voltage drops below 4 0V dc Temperature Operating 0 to 50 32 to 122 F Storage 20 to 60 C 4 to 140 F Temperature Coefficient 0 1 x Specified Accuracy per 0 to 18 28 to 50 Humidity noncondensing Operating
34. 1 TM2 TM3 TM4 TM5 TM6 TM7 TM8 TM10 TM11 Description MAIN PCA BATTERY 1 5V 0 480MA ALKALINE SIZE C SCREW PH P AM THD FORM STL 4 14 375 SCREW PH P AM THD FORM STL 5 14 812 JUMPER INPUT RED JUMPER INPUT BLK WINDOW DECAL CASE TOP LCD MODULE 160X128 GRAPH TRNSFLECTIVE MODULE INPUT OVERMOLDED SUPPORT INTERNAL INSERT CONTAINER CASE BOTTOM OVERMOLDED HOOK SPRING BATTERY COVER BATTERY OVERMOLDED ACCESSORY PACK ACCESSORY PACK RS232 CLAMP AC CURRENT HOLDER LED CONN ELASTOMERIC KEYPAD TO PWB 1 350L SHOCK ABSORBER SEAL CALIBRATION LABEL ADHES MYLAR 1 50 312 CONTAINER TOP SOFTWARE FLUKEVIEW 41 MODULE KEYPAD 39 41B USER MANUAL 39 41B USER MANUAL ENG FR SP 39 41B USER MANUAL ENG GER IT 801 5008 INSTRUCTION SHEET ENG 801 5005 INSTRUCTION SHEET SPAN 801 5005 INSTRUCTION SHEET GER 801 5005 INSTRUCTION SHEET FR 39 41B QUICK REF GUIDE SW41 FLUKEVIEW SOFTWARE USERS MANUAL SW41 FLUKEVIEW SOFTWARE USERS MANUAL INTL Fluke Stock No 202827 423582 448456 942946 936877 937040 202744 936828 928296 936836 936815 936729 936831 936810 936906 936807 936851 936856 936943 937011 942805 948708 937045 943407 202777 936880 936745 107607 107612 107620 936922 948534 948539 948542 107653 107631 600855 Tot Qty Notes 6 13 39 41 Service Manual 6 14 Table 6 3 Fluke 41B Final Assembly cont Referen Fluk k nr Description
35. 1 PB9 4 HA2 PB10 122 CLGND 2 13 LOW BAT KEYPAD BL CT LCD PWR PWR ON MODEL CKSUM OK 45545444 EE UPLOW FLUKE 4X 1021 2 of 6 DE COUPLING CAPACITORS DSP56003 DSP56003 PVCC es 1 C15 1 E 1 1 eieiele i 1 gel 92 I C5 1 22 15 1 i 1 1 032 2725 28256 DSP56003 Figure 7 1 1 Main PCA Fluke 39 and 41B cont Schematic Diagrams 7 41 ONLY ES LOW BATTERY DETECT 9 gt TRANSMITTER As DEFAULTS MEMORY VCC 2 18 y 1 a U22 lt i 93C46 CS EESER U20 1 SK j CS VCC LM358DT LOW BAT SK DI NC R56 i LM358DT DOUT EESER PO CND i 24 9 U21 O21 1 33K MMBT3906 1 156 i m pP 7 i CONTRAST CONTROL p i X9313 SFH409 2 R25 i U8 MBT3904 i EE UPLOW 2 T 1 U D o INC EEPOT Je CS Q XD VCC 2 3 1 3 20 LM358DT R24 bi 46 10 35 RESET R V BAV99 TC IR Ok MMBT6429 Q15 Q14 100 MMBT6429 Cha MMBT6429 021 R35 R5 LM358DT 100 019 MMBT6429 Q17 Q2 MMBT6429 MMBT6429 a 2 e LM4041EIM3 1 2 R72 40 100K 100K FLUKE 4X 1021 8 of 6 V Figure 7
36. 10 R3 R4 R6 R7 R44 R8 R12 R9 R14 R11 R13 R15 R16 R34 R35 R40 R55 R60 R63 R17 R66 R18 R23 R38 R19 R24 R75 R20 R21 R22 R25 R26 Description DIODE SI 30 PIV 1 1 AMPS SCHOTTKY DIODE SI BV 75V IO 250MA SOT 23 FERRITE CHIP 60 OHM 9100 MHZ 1806 CONN FLAT FLEX 1MM CTR RT ANG 24 POS SOCKET SINGLE PWB FOR 0 026 0 033 PIN TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI N DMOS FET SOT 23 TRANSITOR PHOTO W DAYLIGHT FILTER TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI P MOS 60V SOT 23 TRANSISTOR SI NPN BIASED SC 59 TRANSISTOR SI PNP 50V 0 2W SOT 23 TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI PNP SMALL SIGNAL SOT 23 RES CERM 20K 5 125W 200PPM 1206 RES CERM 75K 1 125W 100PPM 1206 RES CERM 121K 1 125W 100PPM 1206 RES CERM 36 5K 1 125W 100PPM 1206 RES CERM 226K 1 125W 100PPM 1206 RES CERM 36K 5 125W 200PPM 1206 RES CERM 15K 5 125W 200PPM 1206 RES CERM 20K 5 125W 200PPM 1206 RES CERM 121K 1 125W 100PPM 1206 RES CERM 36 5K 1 125W 100PPM 1206 RES CERM 226K 1 125W 100PPM 1206 RES CERM 100K 5 125W 200PPM 1206 RES CERM 10K 5 125W 200PPM 1206 RES CERM 470 1 1W 100PPM MELF RES CERM 10K 5 125W 200PPM 1206 RES CERM 499K 1 1W 100PPM MELF RES CERM 680K 5 125W 200PPM 1206 RES CERM 11K 1 125W 100PPM 1206 RES CERM 6 2K 5 125W 200PPM 1206 Fluke Stock
37. 100PPM 1206 RES CERM 226K 1 125W 100PPM 1206 RES CERM 100K 5 125W 200PPM 1206 RES CERM 10K 5 125W 200PPM 1206 RES CERM 470 1 1W 100PPM MELF RES CERM 10K 5 125W 200PPM 1206 RES CERM 499K 1 1W 100PPM MELF RES CERM 680K 5 125W 200PPM 1206 RES CERM 6 2K 5 125W 200PPM 1206 RES CERM 1K 5 125W 200PPM 1206 RES CERM 1K 1 125W 100PPM 1206 RES CERM 510K 5 125W 200PPM 1206 RES CERM 47K 5 125W 200PPM 1206 RES CERM 10 5K 1 125W 100PPM 1206 RES CERM 200 1 125W 100PPM 1206 RES CERM 27K 5 125W 200PPM 1206 RES CERM 620K 5 125W 200PPM 1206 Fluke Stock No 811539 912469 927538 742676 742676 867606 942912 820910 912469 746644 746644 867085 867437 929906 876524 769281 746628 746644 867437 929906 876524 740548 740548 740548 746610 944244 746610 929922 929901 746016 745992 783241 746800 746685 851852 772798 740530 811919 Tot Qty Notes List of Replaceable Parts Parts Lists 6 Table 6 2 Fluke 39 A1 Main PCA cont Reference Designator R47 R48 R49 R50 R52 R53 R54 R57 R58 R59 R80 R61 R62 R64 R65 R67 R68 R69 R70 R71 R76 R72 R74 R77 R81 R86 R87 R88 RT1 T1 T2 U1 U2 U3 U4 U5 7 U8 U9 U10 U24 U12 U13 U14 U15 Description RES CERM 6 98K 1 125W 100PPM 1206 RES CERM 17 8K 1 125W 100PPM 1206 RES CERM 24 9K 1 125W 100PPM
38. 1206 RES CERM 29 4K 1 125W 100PPM 1206 RES CERM 37 4K 1 125W 100PPM 1206 RES CERM 20K 1 125W 100PPM 1206 RES CERM 3 3 5 125W 400PPM 1206 RES CERM 220K 5 125W 200PPM 1206 RES CERM 1M 1 125W 100PPM 1206 RES CERM 10 5 125W 200PPM 1206 RES CERM 12 1K 1 125W 100PPM 1206 RES CERM 2 74K 1 125W 100PPM 1206 RES CERM 205K 1 125W 100PPM 1206 RES CERM 215K 1 125W 100PPM 1206 RES CERM 15M 5 125W 300PPM 1206 RES CERM 4 7K 5 125W 200PPM 120 RES CERM 10 5K 1 125W 100PPM 1206 RES CERM 0 05 MAX 125W 1206 RES CERM 100 5 125W 200PPM 1206 RES CERM 100K 5 125W 200PPM 1206 RES CERM 36K 5 125W 200PPM 1206 RES CERM 220 5 125W 200PPM 1206 RES CERM 47 5 125W 200PPM 1206 RES CERM 49 9K 1 0 1W 100PPM 0805 RES CERM 12 1 1 0 1W 100PPM 0805 THERMISTOR POS 1 1K 20 25 INDUCTOR 100UH 20 0 51 ADC INDUCTOR 200UH 20 0 36ADC IC CMOS OCTAL D F F EDG W 3 ST SOIC IC DIGITAL SIGNAL PROC LV 24 BIT POFP LOGIC DEVICE PROGRAMMED EPROM PROGRAMMED C CMOS SRAM 32K X 8 LO V 25 NS SOJ28 C CMOS EEPOT 1K OHM 32 TAPS LO V SO8 C CMOS GUAD BILATERAL SWITCH SOIC C CMOS 10 BIT A D W SAMPLE HOLD SOIC C OP AMP FET PREC LOW PWR SNGL S SO8 C OP AMP FET PREC LOW PWR SNGL 5 508 Fluke Stock No 929919 929930 867689 929935 867486 927421 867502 746750 836387 746214 930032 930156 769836 836643 811968 740522 851852 810747 746297 740548 769281 746347
39. 206 CAP CER 1000PF 1 50V C0G 1206 CAP CER 100PF 1 50V C0G 0805 CAP CER 0 1UF 10 25V X7R 1206 CAP CER 100PF 1 50V C0G 0805 CAP CER 8200PF 20 50V X7R 0805 CAP CER 2700PF 20 50V X7R 0805 CAP CER 0 22UF 80 20 50V Y5V 1206 CAP CER 750PF 1 50V C0G 0805 CAP CER 20PF 10 50V C0G 1206 CAP CER 47PF 10 1000V C0G 1808 CAP CER 0 1UF 10 25V X7R 1206 CAP TA 1UF 20 35V 3528 CAP TA 1UF 20 35V 3528 CAP CER 0 01UF 20 100V X7R 1206 CAP CER 330PF 5 50V C0G 0805 CAP CER 0 22UF 80 20 50V Y5V 1206 CAP CER 0 015UF 20 50V X7R 0805 CAP TA 100UF 20 10V 7343 CAP TA 220UF 20 6V 7343H CAP TA 10UF 20 16V 6032 CAP CER 470PF 10 50V C0G 1206 CAP CER 47PF 10 50V C0G 1206 DIODE SI BV 70V IO 50MA DUAL SOT 23 DIODE SI SCHOTTKY 30V SOT 23 DIODE SI SCHOTTKY DUAL 30V SOT 23 LED INFRA RED 1 950 NM Fluke Stock No 867643 867668 867668 867650 747287 747287 747287 747287 747287 747287 747287 867650 942516 930149 740597 867643 747345 930235 747287 747287 747287 866970 866970 742981 512038 740597 493916 929877 944496 867572 747360 747352 742320 742320 930060 929745 942545 Tot Qty 30 Notes List of Replaceable Parts Parts Lists 6 Table 6 4 Fluke 41B A1 Main PCA cont Reference Designator CR7 CR10 P5 P7 Q1 Q8 Q2 Q3 Q13 15 Q4 Q9 Q12 Q5 Q6 Q7 Q10 a11 Q16 Q18 Q20 Q17 Q19 Q21 R1 R5 R30 R51 R2 R
40. 260L011 s n vin ern sd ueg sawy zin en t SOA nduj SOA 8n fejdsiq 1521009 SJOAUQ 10433 Ly aynl q91 Tas 91 SO LO 980120 eig 82 22140 Ae ds q Buiuonipuoo ndul tif eps Figure 2 1 Overall Functional Block Diagram 2 4 Theory of Operation 2 Circuit Operation 2 4 The power supply voltages for the Tester are derived from four cell batteries The 4 to 6 volt dc source generates 6 separate voltage sources to power digital analog and display circuitry The cell batteries typically provide 48 hours of Tester operation The Input Conditioning section filters and controls the amplitude of the incoming signals to the a d converters Signal amplitude is adjusted for maximum dynamic range of the a d converters The anti aliasing filter eliminates any signal components that are more than one half the sampling frequency Without this filter some signals may be interpreted incorrectly There are two a d converters in the Tester One for the volts input and the other for the amps input These a d converters quantize the input signals to digital or numeric values so the Digital Signal Processor DSP in th
41. 6 RES CERM 220K 5 125W 200PPM 1206 RES CERM 1M 1 125W 100PPM 1206 RES CERM 10 5 125W 200PPM 1206 RES CERM 12 1K 1 125W 100PPM 1206 RES CERM 2 74K 1 125W 100PPM 1206 RES CERM 205K 1 125W 100PPM 1206 RES CERM 215K 1 125W 100PPM 1206 RES CERM 15M 5 125W 300PPM 1206 RES CERM 4 7K 5 125W 200PPM 1206 RES CERM 10 5K 1 125W 100PPM 1206 RES CERM 100 5 125W 200PPM 1206 RES CERM 100K 5 125W 200PPM 1206 RES CERM 36K 5 125W 200PPM 1206 RES CERM 220 5 125W 200PPM 1206 RES CERM 47 5 125W 200PPM 1206 RES CERM 0 05 MAX 125W 1206 RES CERM 49 9K 1 0 1W 100PPM 0805 Fluke Stock No 745992 783241 929898 746800 810747 772780 746685 740522 851852 772798 740530 811919 929919 929930 867689 929935 867486 927421 867502 801423 746750 836387 746214 930032 930156 769836 836643 811968 740522 851852 746297 740548 769281 746347 746263 810747 928697 Tot Qty Notes List of Replaceable Parts Parts Lists 6 Table 6 4 Fluke 41B A1 Main PCA cont Reference Designator R88 RT1 T1 T2 U1 U2 U3 U4 U5 7 U8 U9 U10 U24 U11 U12 U13 U14 U15 U16 18 U19 U20 U21 U25 022 023 026 028 029 030 031 VR1 Y1 21 23 22 ZA Z8 Z5 Z7 Z6 Description RES CERM 12 1 1 0 1W 100PPM 0805 THERMISTOR POS 1 1K 20 25 C INDUCTOR 100UH 20 0 51 ADC INDUCTOR 200UH 20 0 36ADC IC CMOS OCTAL D F F EDG W 3
42. 60 Hz on the NORMAL output and 20 mV at the same frequency on the AUX output Press the WAVE MENUS softkey and ensure the phase angle is 10 00 degrees Press the HARMONIC MENU softkey and ensure the HARMONIC selection is set to 1 and the FUNDMTL selection is set to normal then press OPR Verify that the harmonic amplitude and phase angle readings displayed by the Tester are within the minimum and maximum limits listed in Table 4 6 Performance Testing and Calibration 4 Calibrating the Tester Table 4 6 Harmonics Performance for Amps Fluke Fluke 5500A Output Tester Performance Limits Amplitude Harmonic Phase Harmonic Amplitude Phase mV No deg Cursor Win Max Min Max 20 00 1 1 19 1 20 9 8 12 20 00 3 3 19 1 20 9 14 26 20 00 9 9 19 1 20 9 21 39 20 00 13 13 19 1 20 9 29 51 20 00 21 21 18 7 21 3 35 65 20 00 31 31 18 1 21 9 40 80 4 13 Testing Serial Performance Model 41B Only Confirming serial I O performance requires the RS 232 optical interface cable FlukeView M software and a PC running Window 3 1 If not already done install the FlukeView software on the PC and configure for the appropriate serial port 1 QA dies 29249 Connect the optical interface cable between the optical interface on the side of the Tester and the serial port of the PC Note The correct serial port on the PC will be determined by the configuration of the PC and in
43. 67668 867668 867650 747287 747287 747287 747287 747287 747287 747287 867650 942516 867643 747345 930235 747287 747287 747287 866970 866970 742981 512038 740597 493916 929877 944496 867572 740597 747360 747352 930060 929745 742320 782573 830489 944645 929893 Tot Qty 30 Notes 6 7 39 41 Service Manual 6 8 Table 6 2 Fluke 39 A1 Main PCA cont Reference Designator P5 P7 Q2 Q3 Q13 15 04 09 012 06 07 8 Q10 Q11 Q16 Q18 Q20 Q17 Q19 R1 R5 R30 R51 R2 R10 R3 R4 R6 R7 R44 R8 R12 R9 R14 R11 R13 R15 R16 R34 R35 R40 R55 R60 R63 R17 R66 R18 R23 R38 R19 R24 R75 R20 R21 R22 R26 R27 R28 R45 R31 R37 R41 R42 R43 R46 Description SOCKET SINGLE PWB FOR 0 026 0 033 PIN TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI N DMOS FET SOT 23 TRANSISTOR SI NPN SMALL SIGNAL SOT 23 TRANSISTOR SI NPN SMALL SIGNAL SOT TRANSISTOR SI P MOS 60V SOT 23 TRANSISTOR SI NPN BIASED SC 59 TRANSISTOR SI PNP 50V 0 2W SOT 23 TRANSISTOR SI NPN SMALL SIGNAL SOT 23 RES CERM 20K 5 125W 200PPM 1206 RES CERM 75K 1 125W 100PPM 1206 RES CERM 121K 1 125W 100PPM 1206 RES CERM 36 5K 1 125W 100PPM 1206 RES CERM 226K 1 125W 100PPM 1206 RES CERM 36K 5 125W 200PPM 1206 RES CERM 15K 5 125W 200PPM 1206 RES CERM 20K 5 125W 200PPM 1206 RES CERM 121K 1 125W 100PPM 1206 RES CERM 36 5K 1 125W
44. 746263 928697 930081 867192 929729 929732 929869 929740 202801 202804 929799 929786 929828 929828 875232 929070 Tot Qty Notes 6 9 39 41 Service Manual 6 10 Table 6 2 Fluke 39 A1 Main PCA cont Reference Designator U16 18 U19 U21 U25 U22 U23 U26 U28 U29 030 031 VR1 Y1 Z1 Z3 72 ZA Z8 Z5 Z7 Z6 Description IC OP AMP DUAL PICOAMP IB SO8 C CMOS TIMER LOW POWER SO8 C OP AMP DUAL LOW POWER SOIC C EEPROM SERIAL 64 X 16 LO V SO8 C 5V TO 5V CONVERTER SWTCH CAP SO8 REF SHUNT 1 2 2 150 PPM SOT23 C VOLTAGE REF 2 5V 0 4 25PPM SO8 C V CONVERTER CHARGE PUMP 100 MA SO8 C VOLT REG PWM STEP DOWN ADJ SO8 C VOLT REG FIXED 5V UPOWR LO DO SO8 ZENER UNCOMP 22V 5 5 6MA 0 2W SOT 23 CRYSTAL 3 86918MHZ 50PPM SURFACE MT RES CERM SOIC 14 PIN 13 RES 47K 2 RES CERM SOIC 14 PIN 13 RES 30K 2 RES MF SOIC 8 PIN 4 RES 2K 1 RES MF SOIC 8 PIN 4 RES CUSTOM RNET CERM CUSTOM HI V INST Fluke Stock No 910836 930151 867932 929802 929844 929489 929831 929851 942953 929190 831230 929716 929864 930003 929963 929968 900576 Tot Qty Notes List of Replaceable Parts Parts Lists 6 L2 L3 Ops C R38
45. 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 4 16 4 17 4 18 4 19 Level Shifter A D Converters Digital Kernel Digital Signal Processor U2 Programmable Logic Device SRAMs U5 U6 U7 EPROM U4 EEPROM U11 Serial EEPROM U22 Keypad tente eerte Display LCD Module BackLight Contrast Control EEPOT U8 Optical Interface Model 418 Only Receiver Introduction Warranty Repairs and Shipping Information General Maintenance Information Required Equipment Static Safe Handling Cleaning ore tete terere Disassembling the Tester Removing the Meter Case Bottom Removing the PCA and Input Module Removing the LCD Module Removing the Elastomeric Keypad Reassembling the Installing the PCA and Input Module
46. AL DOUT AMPS SHIFT MUX REGISTER SCK DOUT VOLTS DOUT DOUT EESER ATOD EESER FSO ATOD_EESER Figure 2 2 PLD Block Diagram t2f eps 2 29 Memory Decoding The signals A15 A14 A5 A4 PS DS XY and WR are used to map out the SRAM EPROM EEPROM Gain Latch EEPOT and LCD in program and data space Although the SRAM looks like one contiguous RAM space it s actually divided into three separate memory spaces Table 2 3 shows where external memory and I O are mapped Table 2 3 Memory Map Device X Data Space Y Data Space Program Space SRAM U7 5 8000 9FFF 8000 9FFF 0000 1FFF 4000 5FFF EPROM U4 8000 FFFF EEROM U3 4000 7FFF LCD FFCO FFC1 LATCH U1 FFDO EEPOT U8 FFEO FFFO 39 41 Service Manual 2 30 2 31 2 32 2 33 Table 2 4 is a truth table for the selection of the various devices in the Tester Table 2 4 Logic Truth Table Device Signal aa as A14 ats os PS XY SRAM CS SRAM o o SRAM CS SRAM 1 EEPROM CS EEPROM 0 EPROM CS BOOTROM LCD CS LCD EEPOT INC EEPOT EEPOT CS LATCH CS GAIN Interface to LCD Module The LCD module requires a clock sync signal E that synchronizes all read and write operations It signals the display module that all address data and control signals are valid with an active high state This signal is gener
47. Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 AM Established 1981 FLUKE 39 41B Power Meter amp Power Harmonics Analyzer Service Manual PN 601044 October 1995 Rev 1 9 00 1995 2000 Fluke Corporation Inc All rights reserved Printed in U S A All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if produ
48. CD module 1 Remove the four Phillips screws from the corners of the LCD module 2 Liftthe LCD module out of the case top 3 11 Removing the Elastomeric Keypad After you have removed the case bottom and pca lift the Elastomeric keypad out of the case top 3 12 Reassembling the Tester Generally reassembling the Tester is the reverse of disassembly However you must follow special precautions when installing the pca and input module 3 13 Installing the PCA and Input Module 1 With the held outside the case top and the flex cable connector latch pulled out insert the free end of the flex cable into the connector Make sure that the flex cable is fully engaged Push the connector latch back against the connector body 3 6 General Maintenance 3 Reassembling the Tester 2 Rotate the pca into the case top aligning the holes in the pca over the six bosses Make sure that the pca is pressed down over the ribs of the boss in the upper right corner of the case top Align the top edge of the input module with the sealing groove on the case top While ensuring the input module remains squarely within the side walls of the case top press the input module into the groove until it seats snugly against the top edge of the case top Ensure the four leads from the input module remain connected to the pca The black wire must be dressed so that it wraps counterclockwise into the connector Both the black and red wire must
49. DULE INPUT OVERMOLDED CASE BOTTOM OVERMOLDED SUPPORT INTERNAL HOOK SPRING BATTERY COVER BATTERY OVERMOLDED ACCESSORY PACK CLAMP AC CURRENT CONN ELASTOMERIC KEYPAD TO PWB 1 350L SHOCK ABSORBER SEAL CALIBRATION LABEL ADHES MYLAR 1 50 312 MODULE KEYPAD 39 41B USER MANUAL ENG FR SP 39 41B USER MANUAL 39 41B USER MANUAL ENG GER IT 801 5008 INSTRUCTION SHEET ENG 801 5005 INSTRUCTION SHEET SPAN 801 5005 INSTRUCTION SHEET GER 801 5005 INSTRUCTION SHEET FR 39 41B QUICK REF GUIDE CABLE FLAT JUMPER 24COND 039SP 1 30 CONTACT BATTERY 1 ACCESSORY PACK INCLUDES THE FOLLOWING ITEMS MP1 TEST LEAD SI R A STRT BANANA RED TL24 927798 1 MP2 TEST LEAD SI R A STRT BANANA BLK TL24 927793 1 PROBE TEST BANANA JACK RED TP20 927777 1 MP4 PROBE TEST BANANA JACK BLK TP20 927772 1 5 CLIP ALLIGATOR BANANA SAFETY RED AC20 927582 1 MP6 CLIP ALLIGATOR BANANA SAFETY BLK AC20 927579 1 Fluke Stock No 202820 423582 448456 942946 936877 937040 202751 104171 928296 202694 104182 936815 202705 936906 202702 936851 936943 942805 948708 937045 943407 202788 107612 107607 107620 936922 948534 948539 948542 107653 936992 936752 Tot Qty Notes 6 5 39 41 Service Manual SEE VIEW A FLUKE 39 T amp B 6 6 Figure 6 1 Fluke 39 Final Assembly t10f eps List of Replaceable Parts Parts Lists 6
50. M 1022 Keypad Display LCD wi TT BackLight 2 1 39 41 Service Manual 2 2 2 42 2 43 2 44 2 45 Contrast Control EEPOT U8 Optical Interface Model 41B Only Transtoltter u uu u reete l u De OUS Receiver Theory of Operation 2 Introduction 2 2 Introduction Chapter 2 provides circuit descriptions for the Fluke 39 Power Meter and Fluke 41B Power Harmonics Analyzer First the Tester is described in general terms with a Functional Block Description Then each block is detailed further with Detailed Circuit descriptions Schematic diagrams are provided in Chapter 7 A signal name followed by an asterisk is active asserted low A signal name not followed by an asterisk is active high Functional Block Description The Tester is unlike most Fluke handheld meters All waveforms and readings are based on hundreds of measurements instead of a few integrate cycles used in most DMMs The 128 points used to display waveforms are not directly sampled but are synthesized using several hundred measurements This approach allows the instrument to be more flexible and display a wider range of data such as time and frequency domain data Using sampled data for watts and RMS values instead of traditional analog measurement techniques reduces cost s
51. ST SOIC IC DIGITAL SIGNAL PROC LV 24 BIT POFP LOGIC DEVICE PROGRAMMED EPROM PROGRAMMED C CMOS SRAM 32K X 8 LO V 25 NS SOJ28 C CMOS EEPOT 1K OHM 32 TAPS LO V SO8 C OP AMP FET PREC LOW PWR SNGL S SO8 C OP AMP FET PREC LOW PWR SNGL 5 508 C CMOS EEPROM LV 32K X 8 250 NS PLCC C CMOS GUAD BILATERAL SWITCH SOIC 5 10 A D W SAMPLE HOLD SOIC IC OP AMP DUAL PICOAMP IB SO8 C CMOS TIMER LOW POWER SO8 C OP AMP DUAL LOW POWER SOIC C EEPROM SERIAL 64 X 16 LO V SO8 C 5V TO 5V CONVERTER SWTCH CAP SO8 C V REF SHUNT 1 2 V 2 150 PPM SOT23 C VOLTAGE REF 2 5V 0 4 25PPM SO8 C V CONVERTER CHARGE PUMP 100 MA SO8 C VOLT REG PWM STEP DOWN ADJ SO8 C VOLT REG FIXED 5V UPOWR LO DO SO8 ZENER UNCOMP 22V 5 5 6MA 0 2W SOT 23 CRYSTAL 3 86918MHZ 50PPM SURFACE MT RES CERM SOIC 14 PIN 13 RES 47K 2 RES CERM SOIC 14 PIN 13 RES 30K 2 RES MF SOIC 8 PIN 4 RES 2K 1 RES MF SOIC 8 PIN 4 RES CUSTOM RNET CERM CUSTOM HI V INST Fluke Stock No 930081 867192 929729 929732 929869 929740 202801 202804 929799 929786 929828 929828 929737 875232 929070 910836 930151 867932 929802 929844 929489 929831 929851 942953 929190 831230 929716 929864 930003 929963 929968 900576 Tot Qty Notes 6 19 39 41 Service Manual t14f eps S m dOl NET NC SO ais iL R33 R58 EZ8 C10 ozi 5 BBB C33
52. Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To contact Fluke call one of the following telephone numbers USA 1 888 99 FLUKE 1 888 993 5853 Canada 1 800 36 FLUKE 1 800 363 5853 Europe 31 402 678 200 81 3 3434 0181 Singapore 465 738 5655 Anywhere in the world 1 425 446 5500 Or visit Fluke s Web site at www fluke com Chapter 1 Table of Contents Title Introduction and Specifications J 1 1 Hiper 1 2 Organization of the Service M
53. V typical With Q9 and Q13 both on Q10 remains on when the power switch is released If something causes U2 not to toggle DOG Q9 turns off after one to three seconds causing Q10 to turn off and remove power from the instrument This circuit arrangement allows the instrument to always recover from any microcontroller crash Q8 signals the microcontroller that the power switch has been pressed after power has been applied The microcontroller considers this a signal to turn off the instrument VCC U30 is a buck switching regulator that changes the battery voltage 4V to 6V dc to the 3 3V needed for the digital circuitry The battery is always connected to the power pin of U30 U30 is in the standby mode until pin 1 goes to the battery voltage level R31 and C50 set the soft start time Feedback from the voltage divider RA8 and R41 sets the Theory of Operation 2 Circuit Descriptions 2 10 2 12 2 14 output to 3 3V dc 5 The feedback voltage is 1 224 dc Transformer T1 capacitor C63 filter the output of U30 U30 has an internal Undervoltage Lockout circuit The circuit monitors the supply voltage and allows normal operation for voltages greater than 3 75V dc typical with 0 25V dc of hysteresis When an undervoltage is detected control logic turns off the internal power FET and momentarily grounds C50 This starts a soft start cycle Circuit operation will not start until the supply voltage goes ab
54. ading writing to the SRAM should be compared with the following timing diagrams Troubleshooting Troubleshooting the Digital Section ns 100 ns 200 ns 300 ns k 6 20 Min Max 263 15 A0 A15 Address Bus DS PS XY DS PS X Y 15 Min Max m CS BOOTROM 250 Min Max i in Max 285 46 Min Max 125 Min Max a AD 0 281 96 gt DATA t16i eps pes CLOCK l 26 32 6 20 Min Max 0 15 DS PS q Address Bus DS PS XY CS SRAM Min Max an 5 05 Min Max 48 63 Min Max 8 Min RD 0 45 13 Min Max DATA Q t17i eps If these signals are not correct verify that the appropriate signals A15 A14 A5 A4 RD WR XY PS are present and correct If these signals are not correct you may have a problem with the DSP chip U2 If these signals are correct you may have a problem with U3 5 7 Troubleshooting the A D Converter Output To isolate a problem with the a d converters proceed as follows 1 Check that SCO SC2 SCK and SRD at U2 are correct e SCO 02 29 labeled CHL controls which A D converter is being read e SC2 02 32 labeled FSO Generates
55. anual eee 1 3 ON 1 4 General Information 2 aaa 1 5 1 6 Power Requirements 1 7 Options Accessories and Related Equipment 1 8 Operating 1 9 Theory of Operation 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 17 2 18 2 19 2 20 2 21 2 22 Introduction Functional Block Description eee Circuit Operation Power Up Sequence trt Piet Normal Operation Circuit Descriptions Power Supplies Power On 1 entree Low Battery Detection iret erre toto tn kayaka Power Reset Input Conditioning Difference Amplifier Voltage Input Protection Circuit Current Gain Amplifier Latch U1 Anti Alias Filter 39 41 Service Manual 2 23 2 24 2 25 2 26 2 27 2 34 2 35 2 36 2 37 2 38 2 39 2 40 2 41 2 42 2 43 2 44 2 45 General Maintenance 3 1 3 2 3 3 3 4 3 5 GG G2 G2 G C29 C29 C29 C2 Performance Testing and Calibration 4 4 2 4 3 4 4 4 5 4 6 4 T 4
56. ated from U2 signals WR RD DSPCLOCK and CS LCD This generated E signal is active high during a read write operation between the DSP and the LCD module ERI lo x Shift Register The amps and volts readings are sampled simultaneously to avoid phase errors The a d data for both input channels is transferred to the DSP over a single serial port The PLD shift register stores an amps data point while the DSP is reading the associated volts data point After the volts data point has been read into the serial port the data from the shift register amps data is clocked out and read This process repeats until the until the appropriate number of samples have been read Serial Multiplexer There are three sources of serial data the volts a d converter the shift register holding the amps data input and the serial EEPROM U22 The DSP signals the PLD multiplexer to select one of the three sources and feed that source to the single serial port on the DSP EEPOT Contrast Control Interface The EEPOT interface of the PLD provides the chip select C8 EEPOT and the control INC EEPOT signals for the EEPOT The signal that controls the direction of the wiper comes directly from the DSP Reading or writing to address location Y FFE0 enables CS EEPOT and strobes the INC POT signal After the correct value is reached
57. ct is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB
58. d to VCC minus one diode drop when the CAP terminal of U29 goes to ground When the CAP terminal goes to VCC the sum of the voltage across C69 and VCC is applied to C67 through the second diode in CR4 U31 is a low dropout 5V regulator VSS The negative analog supply VSS is generated by U23 and Q12 U23 works by charging C65 to 6 6V dc from pin 8 of U23 and then inverts C65 and places it in parallel with C64 Q12 assures that VDD is up before VSS is applied to the analog circuitry VREF The reference voltage for the two a d converters is generated by U28 Z5 and U24 U28 provides 2 5V dc 0 4 which is divided into 2 1154V dc by Z4 U24 buffers the reference voltage 2 1154V dc for use by the a d converters and their input dividers 2 7 39 41 Service Manual 2 8 2 15 2 16 2 17 2 18 2 19 2 20 2 21 Low Battery Detection The low battery detection circuit monitors the battery voltage and sends a signal to the microcontroller when the battery voltage falls below 4 22 volts RA9 and R53 set the reference for the circuit to 1 47 volts R52 and R30 divide the battery voltage down to stay within the common mode range of the op amp R58 provides hysteresis to prevent oscillations LOW BAT goes low when the battery drops below its minimum value Power Heset Various parts of the digital circuitry require a power reset signal to initialize their operation upon power up U26 and Q19 monitor the VCC po
59. de CR2 is correct and installed properly Check that MODE B U2 120 is low when reset U2 125 goes from low to high If it is not low check that diode CR3 is correct and installed properly Check that MODE A U2 121 is high when reset U2 125 goes from low to high If it is not high check that IRQA is pulled high and U3 9 is not driving IRQA low If U3 is driving IRQA low when reset is active verify that the reset line to U3 2 is high when reset is active If U3 2 is high while reset is active and U3 15 still driving IRQA low then U3 may be bad Check for activity on the C SRAM and CS_BOOTROM lines When the DSP reset line is released the DSP should start reading 1536 bytes starting at boot ROM address p C000 On power up the DSP is set to 15 wait states for all memory locations thus CS BOOTROM is asserted low and should have a width of approximately 450 ns Next there should be a short pause a few milliseconds as the DSP executes the loaded code Finally the DSP copies all code from boot ROM to SRAM Since the first 512 words of SRAM is onchip no external SRAM activity will be observed until the onchip SRAM is full While copying the remaining code to external SRAM C8 BOOTROM should be an active low pulse of approximately 310 ns when reading from the EPROM and CS SRAM should be an active low pulse of approximately 70 ns when writing to external SRAM The timing of the signals associated with reading the boot ROM or re
60. e digital kernel can read and process the information Both converters sample the input signals at a 10 kHz rate The digital kernel is basically a small but fast computer system It has three input sources sample data from the a d converters user input via the keypad and user input through the serial optical interface The display is the primary output device but the digital kernel also controls the input conditioning and sends data to a PC or printer through the optical interface The DSP takes the a d converter samples and stores them in static RAM SRAM When enough data samples have been taken the DSP calculates the values and waveforms for display No matter what screen is presently on the display the calculations for all display readings are always performed The display routines determine which screen the user has selected and displays the appropriate data for the screen requested All values and waveforms are the result of thousands of calculations performed by the DSP The optical interface communicates with a PC or printer and it provides a sufficient voltage standoff for safety reasons The Fluke PM9080 interface cable is required to complete the interface to a PC or printer Circuit Operation To help you understand the circuit operation the power up and normal operation sequences are explained below Power Up Sequence 1 The power button is pressed 2 The power supply settles to 3 3 volts about 11 ms after the On button
61. e divider and controls the voltage supplied to the LCD module This voltage varies from about 13V dc to 20V dc The EEPOT setting is also stored to serial EEPROM U22 If an invalid EEPOT value is read from the serial EEPROM a default value is used If a too light value is read a minimum contrast value 15 used Optical Interface Model 41B Only This interface consists of two main sections the receiver and the transmitter Data going out of the unit is transmitted through a infrared LED Incoming data is captured through a photo transistor in the receiver Transmitter CR6 is an infrared emitter used to communicate with an optical RS 232 interface cable provided with the Fluke 41B The transmitter circuit is a simple level shifter used to provide more current to the LED than the DSP can provide directly Q21 is used as a current switch to turn CR6 on and off When TXD on the microcontroller goes low Q21 turns on and the current through CR6 is set by the resistor R36 and the voltage across CR6 The current through CR6 should be 11 mA at ambient Heceiver Q5 is a photo transistor used to receive the signal provided by the Fluke 41B s RS 232 cable It senses the infrared light from the infrared LED in the optional interface cable When an infrared light source is on Q5 begins to conduct harder which turns on Q1 1 provides the necessary current gain to interface the received signal with the microcontroller U20 provides a variable c
62. e the calibration seal to reveal the calibration access hole Performance Testing and Calibration Calibrating the Tester 4 3 f6f eps Figure 4 2 Battery Removal In order for the Tester to remain on while replacing the battery door remove the battery shunt spring and reinsert it with the spring s straight edge on the battery side of the plastic wall Figure 4 3 Place four fresh cell batteries in the Tester taking care to ensure proper polarity Press C to turn the Tester on and allow it to warm up for at least 2 minutes 4 13 39 41 Service Manual 4525 FR ES S DW dy 2 t7f eps Figure 4 3 Battery Spring Adjustment 5 With the instrument in an upright position the Cal Enable switch pads are in the largest and leftmost hole Figure 4 4 Using a small flat blade screwdriver or equivalent blunt tipped conductive object short together the two Cal Enable pads The calibration mode is enabled when the Tester displays the CAL AMP PROBE INPUT menu and calibration factors A command arrow on the left of the display should point to the APPLY VRMS instruction line Note Contact bounce on the Cal Enable pads may advance the Cal Prompt beyond the 20A calibration range In the event this happens turn the Tester off then on and enable calibration again Performance Testing and Calibration 4 Calibrating the Tester 6 Reinstall the battery access lid on
63. eading against the performance limits 9 Verify the readings are within the minimum and maximum limits specified in Table 4 3 Note It is normal for the tester to display OL THD with a VDC input Table 4 3 Amps Performance Calibrator Performance Limits Output Fluke 39 41B Arms Apk Adc mV dc Range Min Max Min Max Max 1 00 mV 2 0 94 1 06 6 70 mV 10 6 52 6 88 13 50 mV 20 13 19 13 81 67 00 mV 100 65 2 68 8 135 0 mV 200 131 9 138 1 670 0 mV 1000 652 688 1000 0 mV 2000 976 1024 mV ac 1 00 mV 2 0 96 1 04 1 34 1 49 6 70 mV 10 6 63 9 25 9 71 13 5 mV 20 13 40 18 67 19 52 67 00 mV 100 66 3 92 5 97 1 135 00 mV 200 134 0 186 7 195 2 670 0 mV 1000 663 925 971 1000 0 mV 2000 992 1381 1447 4 7 39 41 Service Manual 4 8 Testing Watts VA VAR Performance Perform the following procedure to test the watts and VAR functions of the Tester Warning Ensure that the calibrator is in standby mode before making any connection between the calibrator and Tester dangerous voltages may be preSent on the leads and connectors Connect the equipment as shown in Figure 4 1 Calibrator should have a range of 5V to 100V ac and calibrator should have a range of 35 mV to 1 4V ac Set the output amplitude from the calibrators to the values in
64. ecause a static charge must be in the 30 000 to 40 000V range before a person will feel a shock Most electronic components manufactured today can be degraded or destroyed by ESD While protection networks are used in CMOS devices they can only reduce not eliminate component susceptibility to ESD ESD may not cause an immediate failure in a component a delayed failure or wound ing effect is caused when the semiconductor s insulation layers or junctions are punctured The static problem is therefore complicated in that failure may occur anywhere from two hours to six months after the initial damage Two failure modes are associated with ESD First a person who has acquired a static charge can touch a component or assembly and cause a transient discharge to pass through the device The resulting current ruptures the junctions of a semiconductor The second failure mode does not require contact with another object Simply exposing a device to the electric field surrounding a charged object can destroy or degrade a component MOS devices can fail when exposed to static fields as low as 30V 3 3 39 41 Service Manual 8 4 3 8 Follow these two rules for handling static sensitive devices 1 Handle all static sensitive components at a static safe work area Use grounded static control table mats on all repair benches and always wear a grounded wrist strap Handle boards by their nonconductive edges only Store plastic vinyl
65. ed Test Equipment Equipment Type Minimum Specifications Recommended Model Calibrator A volts DC Voltage Fluke 5700A Range 1 mV 600V Fluke 5500A Accuracy 0 1296 AC Voltage Range 1 mV 600V Frequency 60 Hz Accuracy 0 1296 Calibrator B volts AC Voltage Fluke 5200A Range 30 mV 1 4V Fluke 5500A Frequency 60 Hz Accuracy 0 1296 Phase meter Phase accuracy 0 5 degrees 60 Hz Clarke Hess Model 6000A comparing 10 mV and 5 V inputs Fluke 5500A Dual channel AC Voltage Fluke 5500A signal generator Range 50 mV 20 V p p Frequency 60 Hz Accuracy 0 596 Phase accuracy 0 5 degrees 60 Hz sourcing 10 mV and 5 V inputs A second calibrator phase meter and dual channel signal generator is not required when using one Fluke 5500A Multi Product Calibrator 4 3 39 41 Service Manual 4 3 Performance Tests 4 6 4 4 If the Tester passes the following tests the meter is in proper operating condition If the meter fails any of the performance tests calibration adjustment and or repair is needed Warming Up the Tester Before performing any of the following performance tests the Tester should be allowed to sit for four hours in an environment of 18 28 C with a relative humidity of less than 70 Once adjusted to the environment turn on the Tester and allow it to warmup for at least 2 minutes Checking the Display Pixels To check the Tester s diplay pixels press and hold 9
66. el 41B s memory feature Serial EEPROM U22 The serial EEPROM U22 provides non volatile storage of calibration constants power up defaults and display contrast constants Keypad The keypad consists of 15 individual keys in a 4x4 matrix When a key is pressed one of the 16 possible points in the matrix is shorted together The rows of the matrix are pulled up to Vcc with 30 resistors Z2 The columns are normally at a low state which is controlled by the DSP The total resistance of the switch as seen at the pca should be less than 3 The contact resistance itself is only about 2000 but there are several other virtual resistors in the circuit including the elastomeric connector that contacts the keypad to the pca The normal voltage at the four row lines is Vcc when no keys are pressed When a key is pressed the corresponding row is pulled down to about 0 4V dc The four row signals are also connected to U3 If U3 senses that any of the row signals is in a low state it generates an interrupt to the DSP By applying logic low to the columns one by one the DSP can determine the pressed key Display The Fluke 39 41B display consists of two circuits the LCD Module and the Contrast Control LCD Module The LCD module is a complete system It contains the liquid crystal LCD drivers con troller display RAM backlight and hardware to hold it together as a module The LCD module connects to the rest of the system wi
67. ent Limits 2 00 00 cece s Od Power Supplies tbi etn Rene edges ds 5 3 Latch Signals for Voltage aa 6 1 39 Pinal Assembly eed tente pee hehe 6 2 B ke 39 A POA in ep erase iih ka 6 3 H ke 41B Einal Assembly eee seen 6 4 Main derit iet eere erre tere rn 39 41 Service Manual vi List of Figures Figure Title 2 1 Overall Functional Block Diagram seen 2 2 PED Block Diapr m sua eei Harn 3 1 Removing the Case 3 2 Plex Cable SERE nn 4 1 Watts Performance Test Configuration eese emen 4 2 Battery Removal 4 3 Battery Spring Adjustment esses rennen rennen 4 4 Calibration Access Hole eet rette ere Haan nore odes 9 1 Test Pomt ien eee eR 6 L 29 Pinal Assembly eee ea 6 2 39 Main PCA nannte c te i e D cesta zo ER 6 3 Fl k 41B Final Assembly pine e t ta datu 6 4 Fluk 41B A1 Main LL NS rri eate eere tussle ERE e ER 39 41 Service Manual viii 1 00 ONU Gs ms Chapter 1 Introduction and Specifications Title Page Introductio m EEE Organization of the Se
68. er 7 Schematic Diagrams Chapter 7 contains the schematic diagrams for all assemblies and a list of mnemonic definitions to aid in identifying signal name abbreviations Conventions The following conventions are used in this manual e Printed Circuit Assembly PCA A is a printed circuit board and its attached parts e Circuit Nodes A pin or connection on a component is specified by a dash and number following the component reference designator For example pin 19 of U30 would be U30 19 User Notation Switch positions used in the meter circuit descriptions correspond to those in the schematic diagrams in Chapter 7 General Information Description The Fluke 39 and 41B are handheld Testers used to measure voltage and current at power line and harmonic frequencies Using these inputs the Tester automatically calculates power and a wide range of other measurements useful in determining harmonic distortion levels and sources These capabilities allow you to monitor power quality before and after an installation troubleshoot a power distribution system and with Model 41B print out or download data for additional analysis The Tester is both a harmonics measurement tool and a power meter or digital multimeter You can use the Tester to measure voltage events undervoltage overvoltage line outages and neutral to ground levels current levels or to measure power levels Fundamental frequency measurements t
69. eshooting the A D Converter Output 5 8 Troubleshooting the Keypad esee 5 0 Troubleshooting the Range Control Circuit 5 10 Troubleshooting the EEPROM 2 5 11 Troubleshooting the LCD Display 5 12 Troubleshooting the Serial EEPROM List of Replaceable Parls u ss en 6 1 TWO MUCH OM 6 2 How to Obtain Parts re tad 6 3 Manual Status Information esee 6 4 Newer Instruments nn 6 5 Parts Lists naeh E E en Schematic Diagram s 7 1 iii 39 41 Service Manual List of Tables Table Title 2 1 Voltage sauss be eo re ied e an s 2 2 Current Gains d ae ha awa de eu taa 2 3 Memory Map iniecit eh ite b luas aaa Eee EE 2 4 Logie Truth Table attore erede een nen 4 1 Recommended Test 1 4 2 Volts Petformaltice us ea Ran Aaa sqa len 4 3 Amps Performance os p EUER ANC eeu Teu e ke s 4 4 Watts Performance Line Frequency 4 5 Harmonics Performance for Volts eene en 4 6 Harmonics Performance for Amps essere 5 1 Power Supply Curr
70. f and back on to bring up the power up configuration screen The following menu items should be highlighted VOLT WAVE RMS 801 5005 VOLT 9 6K and EPSON If these menu items are not highlighted the serial EEPROM U22 may be defective Note The serial EEPROM signals will be active just after the last step is completed in the power up configuration screen 3 When the serial EEPROM U22 is read from or written to the following conditions should be present e CS EESER should be low U22 1 5 13 39 41 Service Manual e SCK line U22 2 should be changing states at slightly less than a 500 KHz rate e Data written to the serial EEPROM 022 3 should be the same U2 33 line labeled DIN e Data read from the serial EEPROM U22 4 should be the same as the data supplied to the processor U2 38 If the data on U22 4 and U2 38 are not the same but the ATOD EE U3 12 15 low U3 may be defective 6 1 6 2 6 3 6 4 6 5 Chapter 6 List of Replaceable Parts IntroduCetlOR eee ra ret re rn dota Kia s il How to Obtain Parts ire t tret Manual Status Information Newer Instr mi nts iiie inet retrato ERE ea REIN MEE ERREUR Part 5 decir Rass ESPERE 6 1 39 41 Service Manual 6 2 List of Replaceable Parts 6 Introduction 6 1 Introduction Chapter 6 contains an illustrated list of replaceable parts for the Fluke 39 Power
71. following problems may indicate a defective U3 MS 12 bits of DOUT_VOLTS followed by the MS 12 bits of DOUT_AMPS do not make it through U3 correctly SCO and SC2 inputs to U3 are correct but CS AD output from U3 is not correct SCK 15 not an inverted version of SCK Troubleshooting the Keypad To isolate a problem with the keypad do the following 1 Check the column C0 C3 and row 3 lines that go to the keypad module With no keys pressed and the instrument powered up the PWR_SW1 P3 10 should be at the battery voltage 5 to 6 volts PWR_SW2 should be at digital ground Column lines CO to C3 should be driven low Row lines RO to R3 should be pulled high to VCC 3 3V Thus a key press should cause the appropriate row line to be driven low momentarily Refer to the keyboard schematic in Chapter 7 to identify which row line will be driven low for a given key If the column lines from the DSP chip U2 are not low while the instrument is running and updating the display the column line may be shorted to VCC or there may be a problem with the DSP chip If a key press does not drive a row line low there is probably a problem with the keypad or the elastomeric interconnect Check the IRQA line while pressing a key The IRQA line U2 121 or U3 9 should be asserted low when a key is pressed to cause a user interface interrupt in the DSP chip U2 If the IRQA line is asserted and the correct row line to the DSP chip is a
72. g harmonic number 9 Verify that the harmonic amplitude and phase angle readings displayed by the Tester are within the minimum and maximum limits listed in Table 4 5 Note The polarity of the phase on the 5500A is always relative to the NORMAL channel output Therefore the Tester will read a positive phase when the 5500A output is a negative phase 10 Repeat the previous three steps using the settings and limits in Table 4 5 4 9 39 41 Service Manual Table 4 5 Harmonics Performance for Volts Fluke Fluke 5500A Output Tester Performance Limits Amplitude Harmonic Phase Harmonic Amplitude Phase V No deg Cursor Win Max Min Max 7 00 1 10 00 1 6 7 7 3 8 12 7 00 3 3 6 7 7 3 14 26 7 00 9 9 6 7 7 3 21 39 7 00 13 13 6 7 7 3 29 51 7 00 21 21 6 5 7 5 35 65 7 00 31 31 6 2 7 8 40 80 4 12 Testing Harmonics Amps Performance en T s ES Note Make sure that the unit is set to THD RMS before performing this procedure until is displayed above the upper right corner of the harmonics display Press until V 8 is displayed in the top status line of the Tester Press until 3 206 is displayed in the top status line of the Tester Press 2 Connect the calibrator NORMAL output to the V and COM connectors on the Tester Connect the calibrator AUX output to the Current Probe connector on the Tester Set the calibrator output to 7 0 V at 50 or
73. he Tester 9 Press to switch to the Voltage calibration display The Tester displays VOLTS INPUT for voltage calibration Performance Testing and Calibration 4 Calibrating the Tester 4 18 10 Disconnect the calibrator from the Clamp Probe BNC connector Connect calibrator HI and LO outputs to the V and COM inputs of the Tester Press 92 Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps Ensure that the calibrator is in standby mode before making any connection between the calibrator and Tester 11 Apply 175V rms at 60 Hz After allowing the reading to settle press on the Tester 12 Apply 350V rms at 60 Hz After allowing the reading to settle press on the Tester 13 Apply 600V rms at 60 Hz After allowing the reading to settle press on the Tester 14 Press to start gain factor calibration 15 Apply 175V rms at 60 Hz After allowing the reading to settle press on the Tester 16 Apply 350V rms at 60 Hz After allowing the reading to settle press on the Tester 17 Apply 600V rms at 60 Hz After allowing the reading to settle press on the Tester 18 Press to accept calibration factors and store in nonvolatile calibration memory The Tester will then return to normal operation Note The CALIBRATION ERROR message will disappear after calibration is compete and power is cycled After calibrating the Tester remove
74. ificant digit is the smallest value that can be displayed in a range and can be found in the resolution section of the Range and Resolution specifications table When a harmonic error is expressed in the 13 2 2 digits 31 596 2 digits form it is indicating that there is a linear increase in error from the lower harmonic to the upper harmonic The error can be determined as a ratio of the desired harmonic to the number of harmonics in the expression times the difference in error over the range plus the least error For example to find the 22 Harmonic error from the above equation Desired Harmonic Lower Harmonic Upper Harmonic Lower Harmonic X Error Difference Least Error 22 13 31 13 X 3 2 3 5 Therefore the error for the 22 harmonic is 3 5 2 digits Frequency Range Fundamental 6 65 Hz and dc Minimum Input Levels rms or 1A rms Volts Measurements True rms Input Range 5 0V to 600V rms ac dc 5 0V to 933V peak Basic Accuracy rms ac dc 0 5 2 digits 6 65 Hz peak dc 2 3 digits 15V rms add 2 digits Input Impedance 1 balanced Crest Factor gt 3 0 below 300V 1 56 600V Amps Measurements True rms 1 mV A Isolated Input 39 41 Service Manual Input Range Basic Accuracy rms ac dc peak dc Input Impedance Crest Factor Watts Measurements Volt Amps 1 mV A Isolated Input Range Accuracy ac dc
75. is pressed 3 reset line U2 123 changes from high to low about 30 ms after the On button is pressed 4 The DSP automatically downloads 512 words 1 536 bytes of instrument operating code to instrument RAM from the EPROM U4 immediately after coming out of reset 5 The DSP activates the power on signal U2 19 to a high state about 20 ms after coming out of reset 6 remaining instrument operating code about 14K words or 42K bytes is downloaded from the EPROM U4 to the SRAM U5 6 7 This should take about 70 ms or be complete about 100 ms after initial power up 7 While the code is being downloaded a checksum is being calculated If the check sum is correct U2 17 goes high If there is a problem downloading the program the unit powers itself off at this point 2 5 39 41 Service Manual 2 6 2 5 2 6 2 8 8 About 140 ms after the power button is first pressed a dark screen is displayed If the power button is held down during power up a checkerboard test pattern then appears on the LCD When the button is released the instrument resumes normal operation Normal Operation The normal sequence is as follows 1 The Tester simultaneously samples volts and amps inputs and stores the samples in SRAM 2 U2 calculates the results using algorithms stored in the program section of SRAM The results are stored in SRAM as well 3 calculated results are displayed on the LCD The sof
76. ith the EE UPLOW line If the signals EE UPLOW CS EEPOT and INC EEPOT are correct to U8 but the wiper does not move or the part does not save the result U8 may be defective If the CS EEPOT or the INC EEPOT signals are not generated properly verify that all the correct signals are present on U3 A15 A14 A5 4 RD WR XY PS If they are U3 may be defective DSPCLCK _CS LCD _INC_EEPOT _CS_EEPOT t22i eps 5 12 Troubleshooting the Serial EEPROM A faulty serial EEPROM is indicated if upon power up the Tester displays CALIBRATION ERROR or the contrast adjustment is not retained after the Tester has been calibrated and the power has been cycled off on To further isolate the problem proceed as follows Note During calibration the CALIBRATION ERROR message will not disappear until power is cycled 1 Display the power up configuration screen by holding and pressing 0 If multiple menu items are highlighted on a line or no menu items on a given line are highlighted the serial EEPROM U22 is probably faulty Note In the next step the Fluke 39 will not display the baud rate or printer type 2 Resetthe instrument to factory default by holding and pressing 2 Then power the Tester of
77. ize and power consumption The entire digital section operates on 3 3 volts which saves power and generates less Radio Frequency Interference RFI Refer to Figure 2 1 during the following functional block descriptions Tester has seven basic sections e Power Supplies e Input Conditioning e Analog to Digital Conversion Digital Kernel Computer e Keypad e Display e Optical Interface Fluke 41B only 2 3 39 41 Service Manual pue 5 7700 sn NVHS on 917 X 8XMcE NVHS Lun ez 9La n WOH 100g pue INVHS 8XxXY9 INOud33 8XMc INOHd33 8 viov SL pL OY SL N 7700 8 sng eieq ov 27910 8 2700 v sng SSOIPPY 61 09 9 YUS 91607 anid XNW 9SIIN eues en JosseooJg euis en 20095450 91607 n amp eiv E2910 8 s yore 994 SSA seiddngs im 7 41 17 1 q V 2601011 UOISJ9AUO G V 1 2 q V
78. level in Table 5 1 immediately remove the power from the Tester and isolate the excessive current draw using appropriate troubleshooting methods Table 5 1 Power Supply Current Limits Tester Condition Low Limit High Limit Start up Current 130 mA 200 mA Normal w o Backlight 70 mA 110 mA Normal with Backlight 115 mA 165 mA If the Tester powers up within the current limits of Table 5 1 you can check the power supply voltages against the voltage range specified in Table 5 2 Table 5 2 Power Supplies Supply Name Measure Supply Range Jct of C63 amp T1 Comm 3 13V to 3 47V VDD U15 1 Comm 5 75 to 5 25V VSS U17 4 Comm 7 to 5V VEE U25 7 Comm 18 5 to 15V VREF U14 9 Comm 2 1016 to 2 1292V 22 VDC U25 4 Comm 23 32 to 20 68V Troubleshooting the Digital Section The digital section of the Tester is made up of the digital kernel keypad display and optical interface Fault isolation procedures for each of these areas are listed below 5 5 39 41 Service Manual 5 6 5 6 Troubleshooting the Digital Kernel To isolate a problem within the Digital Kernel proceed as follows 1 2 10 Check for loose or unsoldered pins on U2 through U7 Check all VCC pins on U2 for 3 3V Because the VCC pins on the DSP supply power to different areas of the chip any VCC pin that does not receive 3 3V when is pressed could prevent the DSP from powering up Check that CKSUM_OK U2 17 makes
79. lled by the microcontroller through a latch U1 Resistor networks Z4 amp Z7 are ratio matched to 0 19 with the resistor between pins 1 and 8 as the reference Latch U1 The latch U1 controls the switches that select the gain for both the amps and volts input stages The switches controlled by U1 change the feedback path of the amplifiers U9 and U18 thus changing the gain The D inputs to the latch are directly connected to the DSP bus The signal to latch the data is generated by CS GAIN The latch is memory mapped in the Y data space at address FFDO Tables 2 1 and 2 2 show the relationship between the control signals and the selected gain Theory of Operation 2 Circuit Descriptions 2 22 2 23 2 24 Table 2 1 Voltage Gains Range Signal Gain Software Limit 256V X4 low Four 200V peak 512V X2 low Two 500V peak 1024V X1 low One 937V peak Table 2 2 Current Gains Range Control Signals Software X1A Limit 20A peak 1 0 1 0 100 20A peak 200A peak 1 0 0 1 10 200A peak 2000A peak 0 1 0 1 1 2000A peak Anti Alias Filter There are two anti aliasing filters one for volts U16 and the other for amps U17 The anti alias filter consists of both sections of U16 or U17 and the resistors and capacitors that are connected to them The purpose of the filter is to attenuate any input frequencies that are near or above one half of the
80. llowed by are active asserted low Signal names not so marked are active high General Troubleshooting Caution To avoid contaminating the pca with oil from your fingers handle the pca by its edges or wear gloves A contaminated pca may not cause immediate instrument failure in controlled environments Failures typically show up when contaminated units are operated in humid areas Before starting to troubleshoot make sure the batteries are fresh enough to meet the minimum power supply voltages specified in Table 5 2 Starting with a Dead Tester Model 41B Only When the Tester is turned on the display should flash dark and then come up in either the waveform harmonics or text screen mode If it does not it is possible that someone left the display contrast very low causing the display to be blank To eliminate this possibility hold down while pressing 0 and then release both buttons If the Tester still appears dead the problem could be in the power supplies or power on circuit the digital kernel or the display module itself Use the appropriate procedure below to isolate the problem 5 3 39 41 Service Manual VDD P2 Pin1 U15 Pin 16 VCC AMES SGND Junc C63 and T1 AMPS IN VREF U14 Pin 9 c72 v UH ga I
81. lso asserted but the key still is not recognized there may be a problem with the DSP chip The IRQA line should be asserted by U3 if the RESET line U3 2 is low and one of the row line inputs to U3 is driven low by a key press If the IRQA line is not driven low under these conditions U3 may be defective Verify that after the interrupt has occurred the appropriate row line is driven low when the appropriate column line is also driven low This occurs during the interrupt process when the microprocessor is decoding the keypad See the keypad schematic 5 9 39 41 Service Manual in Chapter 7 If the row line is driven low for an incorrect column line then there is some external problem possibly a keypad or elastomeric interconnect problem 5 9 Troubleshooting the Range Control Circuit The Tester s measurement range can be changed manually or automatically If the Tester is unable to change ranges proceed with the following steps 1 Check for the correct level at U1 12 through U1 18 by placing the instrument in manual range and verifying that the input latch is set to the values in Table 5 3 Table 5 3 Latch Signals for Voltage Ranges Range U1 12 U1 13 U1 14 U1 15 U1 16 U1 17 U1 18 20V 50V 100V and 200V 1 1 0 500V 1 0 1 N A N A N A N A 1000V 0 1 1 N A N A N A N A 2A 5A 10A and 20A N A N A N A 1 0 1 0 50A 100A and 200A N A N A N A 1 0 0 1 500A 100
82. n circuit board 2 Verify that the CS LCD and the LCD E signals from U3 are correct If the timing is correct the problem may be with the contrast If there are no connection problems the timing waveforms are correct and the contrast adjustment is not the problem see Starting with a Dead Tester on page 1 3 there may be a problem with the LCD module ns 100 ns ns I ns ENLI 6 20 Min Max 240 52 MinMax 0 15 DS PS X Y Address Bus DS PS XY 15 10 15 Min Max k 150 Min _41 zl 130 Min 15 Min Max _ CS BOOTROM 67 Max 5 05 Min Max 5 05 Max 232 84 Min Max j N pz L 299 34 Min Max gt 0 Min 90 DATA X i t21i eps 3 If the signals CS LCD and LCD E are not correct verify that they are produced correctly by U3 When attempting to read and write to the display the observed timing should match the LCD timing diagrams If the inputs to U3 A15 A14 A5 A4 RD WR XY PS are all present there may be a problem with U3 Vertical lines across the LCD screen will most likely be due to a misalignment of the LCD glass with its elastomeric connector Replace the LCD display module to fix this problem To isolate a problem where the LCD display contrast does not
83. nual Organization of the Service Manual This service manual has the following chapters Chapter 1 Introduction and Specifications Chapter 1 describes the Service Manual explains special terminology and conventions and provides complete meter specifications Chapter 2 Theory of Operation Chapter 2 treats the Tester s circuitry as functional blocks with a description of each block s role in overall operation A detailed circuit description is then given for each block These descriptions explain operation to the component level and support the troubleshooting and repair procedures in Chapter 5 Chapter 3 General Maintenance Chapter 3 provides information on general maintenance handling precautions and disassembly instructions Instructions covering warranty repairs and shipping the instrument to a service center are also contained in this section Chapter 4 Performance Testing and Calibration Chapter 4 contains information on required test equipment performance test procedures and calibration of the instrument Chapter 5 Troubleshooting Chapter 5 provides detailed repair procedures to the component level Troubleshooting and repair procedures rely on the Theory of Operation presented in Chapter 2 and the Schematic Diagrams in Chapter 7 Chapter 6 List of Replaceable Parts Chapter 6 lists the parts used in the Tester as well as information on how and where to order parts 39 41 Service Manual 1 4 Chapt
84. o 100 Hz and harmonic frequency measurements to about 2 kHz are also possible Power Requirements The Tester uses 4 Alkaline C Cells ANSI NEDA 14A IEC LR14 for primary power New Alkaline Cells will provide a minimum of 24 hours of continuous operation typically 48 hours You can also use NiCad batteries however depending on battery condition fully charged NiCad batteries provide 8 hours or less of continuous operation Options Accessories and Related Equipment The following accessories are supplied with the Fluke 39 and 41B 801 5005 AC Current Probe e TL 24 Test Leads Set of two Red and Black e TP 20 Test Probes 2 e AC 20 Test Clips 2 Introduction and Specifications 1 Specifications The following additional accessories are supplied with the Fluke 41B e RS 232 Cable e 9 to 25 Pin Adapter e Plug Adapter e 3 5 inch Micro Floppy Disk FlukeView 41 Software Optional accessories for both the Fluke 39 and 41B are as follows e 80i 1000s AC Current Probe e C4ls Soft Carrying Case Operating Instructions Operating instructions for the Fluke 39 and 41B can be found in the Users Manual Fluke PN 942847 See How to Obtain Parts on page 6 1 Specifications Accuracy is specified for a period of one year after calibration Specifications expressed in the 2 3 digits format are saying that the error is a percent of reading plus a number of least significant digits The least sign
85. object e g credit card or plastic tuning tool between the case bottom and the input module and gently pry the case bottom away from the input module Figure 3 1 When the seal between the case bottom and the input module breaks the case bottom will free itself General Maintenance 3 Disassembling the Tester t3f eps Figure 3 1 Removing the Case Bottom 3 9 Removing the PCA and Input Module Caution To avoid contaminating the pca with oil from your fingers handle the pca by its edges or wear gloves A contaminated pca may not cause immediate instrument failure in controlled environments Failures typically show up when contaminated units are operated in humid areas After you have removed the case bottom use the following procedure to remove the pca and input module 1 Before removing the board from the case top disconnect the flex cable from the board by pulling out the connector latch from the connector body Figure 3 2 The latch remains attached to the connector body 2 Pullthe input module away from the case top The input module remains attached to the pca 3 Liftthe pca and input module out of the case top The flex cable pulls away from the connector when the pca is lifted out of the case 3 5 39 41 Service Manual t4f eps Figure 3 2 Flex Cable Connector 3 10 Hemoving the LCD Module After you have removed the case bottom and pca use the following procedure to remove the L
86. ollector supply voltage to Q5 R25 and C10 filter the signal at the collector of Q1 The DC value of the signal is compared with the diode voltage of CR1 U20 integrates the error voltage and sets the voltage at the collector of Q5 C11 is an additional filter for the collector voltage of Q5 The voltage at the collector of Q5 is 2V dc with no light and should go to dc if light is shown continuously on Q5 02 O2 Q WW W WW GB O9 W W W LW O2 Ie hoe NOUO LON Chapter 3 General Maintenance TWO MUCH OM danse tee Warranty Repairs and Shipping Information General Maintenance Required Equipment Static Safe Cleaning Disassembling the Removing the Meter Case Bottom Removing the PCA and Input Module Removing the LCD Module eene Removing the Elastomeric Keypad Reassembling the Tester Installing the PCA and Input Module Reassembling the Case Bottom eene 39 41 Service Manual 3 2 General Maintenance 3 Introduction 3 3 3 4
87. on source output must be stable and the Tester factor readings must settle to their final value Once the factor reading has stabilized press to move to the next calibration step or instruction If all of the calibration steps are completed and ACCEPT CALIBRATION is performed by pressing 592 the new calibration factors are stored in nonvolatile calibration memory At this point calibration is complete and the Tester exits the calibration mode While in the calibration mode the Tester prompts you through the following steps Warning During calibration dangerous voltages are present in the instrument To avoid shock you must make sure the battery cover is installed 1 Connect the calibrator HI and LO outputs to the Clamp Probe connector on the Tester Press 92 A voltage source is used to calibrate the current input DO NOT APPLY A CURRENT SOURCE TO THE BNC CONNECTOR 2 Apply 14 mV rms at 60 Hz After allowing the reading to settle press on the Tester 3 Apply 140 mV rms at 60 Hz After allowing the reading to settle press on the Tester 4 Apply 1 4V rms at 60 Hz After allowing the reading to settle press on the Tester Press to start gain factor calibration Apply 14 mV rms at 60 Hz After allowing the reading to settle press on the Tester 7 Apply 140 mV rms at 60 Hz After allowing the reading to settle press on the Tester 8 Apply 1 4V rms at 60 Hz After allowing the reading to settle press on t
88. ontaining the part Description as given under the DESCRIPTION heading 6 3 Manual Status Information The following Manual Status Information table defines the assembly revision levels that are documented in the manual Revision levels are printed on the bottom side of each Manual Status Information Ref Or Option Assembly Name Fluke Part Revision Number Number Level A1 Fluke 39 Main PCA 202820 A 1 41 202827 6 3 39 41 Service Manual 6 4 Newer Instruments Changes and improvements made to the instrument are identified be incrementing the revision letter marked on the affected pca These changes are documented on a manual supplement sheet which when applicable is included with the manual 6 5 Parts Lists The following tables and figures list and illustrate the replaceable parts for the Tester 6 4 List of Replaceable Parts Parts Lists 6 Table 6 1 Fluke 39 Final Assembly Reference Designator A1 BT1 4 H1 H20 J1 J2 MP1 MP2 MP3 4 5 6 7 8 MP9 MP11 MP12 MP19 MP26 MP27 MP28 51 1 TM2 TM3 TM4 TM5 TM6 TM7 TM8 wi XBT1 XBT2 NOTES Description MAIN PCA BATTERY 1 5V 0 480MA ALKALINE SIZE C SCREW PH P AM THD FORM STL 4 14 375 SCREW PH P AM THD FORM STL 5 14 812 JUMPER INPUT RED JUMPER INPUT BLK WINDOW DECAL CASE TOP LCD MODULE 160X128 GRAPH TRNSFLECTIVE MO
89. ove 3 95V dc 22 Volts The raw voltage needed to run the LCD bias is provided by the TLC555 timer U19 and transformer T2 These two components work as a boost circuit to change the battery voltage to 24V dc Q4 in addition to working in the boost circuit inverts the 24V dc through CR8 C52 and C68 controls this voltage to 22V dc This is necessary because there is no feedback to U19 A feed forward path R61 helps control the supply voltage as the battery voltage changes The duty cycle changes which causes the frequency of the boost circuit to change from 88 to 140 KHz as the battery voltage changes from 4V to 6V dc The LCD supply is controlled by the microcontroller through signal LCD PWR which when high turns U19 on VEE The VEE supply controls the contrast of the LCD U8 is an EEPOT that is controlled by the microcontroller The voltage appearing at the wiper pin is buffered by an op amp part of U25 The other half of U25 is used as a difference amplifier to sum the wiper signal with a voltage which is temperature sensitive The temperature sensitive voltage comes from Q18 which is biased as a diode and has a temperature sensitivity of 2 2 mV degree The default for contrast is 16 6V dc with a range of 15V dc minimum contrast to 18 5V dc Maximum contrast VDD The 5V dc supply is generated by first doubling the VCC supply U29 CR4 C69 and C67 form the voltage doubler circuit Capacitor C69 is charge
90. r to optimum contrast UA UA A DOT Chapter 5 Troubleshooting Introduction ss General nennen Starting with a Dead Tester Model 41B Only Troubleshooting the Power Supply eene Troubleshooting the Digital Section eee Troubleshooting the Digital Kernel Troubleshooting the A D Converter Output Troubleshooting the Keypad eee Troubleshooting the Range Control Circuit Troubleshooting the EEPROM eene Troubleshooting the LCD Display Module Troubleshooting the Serial EEPROM eee 39 41 Service Manual 5 2 Troubleshooting Introduction 5 2 5 3 Introduction This chapter describes troubleshooting procedures that can be used to isolate problems with the Tester These procedures deal primarily with the digital section of the Tester Due to the simplicity of the Analog section only theory of operation is provided to support analog troubleshooting When troubleshooting the Tester follow the precautions listed on the Static Awareness sheet to prevent damage from static discharge Signal names fo
91. rformance 4 9 Testing Record Mode Performance 4 10 Testing Memory Mode Performance Model 41B Only 4 11 Testing Harmonics Volts Performance 4 12 Testing Harmonics Amps Performance 4 13 Testing Serial I O Performance Model 41B Only 4 14 Calibrating the Tester dienen 4 15 Introduction nennen rasen 4 16 Entering Calibration Mode eese 4 17 Making Calibration Adjustments eene 4 18 Exiting the Calibration Mode 4 19 Setting the Minimum Contrast 4 1 39 41 Service Manual 4 2 Performance Testing and Calibration Introduction 4 Warning Service procedures in this chapter should be performed by qualified service personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so 4 1 Introduction This chapter provides calibration and performance tests that allow you to verify that the Tester is operating within published specifications 4 2 Required Equipment The equipment in Table 4 1 is required for performance testing and calibration If the recommended models are not available equipment with equivalent specifications should be used Table 4 1 Recommend
92. rvice Manual eere Sun General Information ener einen DESCLIPUOD HD Power Requirements n asua Options Accessories and Related Equipment Operating Instructions a Specifications eie Eae Birra Wied den ao ES Re DH TERR Rond 39 41 Service Manual 1 2 Introduction and Specifications 1 Introduction 1 1 Introduction This service manual provides information on maintaining troubleshooting and repairing the Fluke 39 Power Meter and Fluke 41B Power Harmonics Analyzer The information in this manual pertains to both models unless otherwise indicated The Fluke 39 and 41B share many features and are collectively referred to as the Tester Model 41B is mentioned when a description pertains to that model only This manual includes the following e Specifications e Theory of operation Calibration procedure e Performance testing and troubleshooting procedures Replacement parts lists e Schematic diagrams A meter under warranty will be promptly repaired or replaced at Fluke s option and returned at no charge See the registration card for warranty terms If the warranty has expired the meter will be repaired and returned for a fixed fee Contact the nearest Service Center for information and prices A list of U S and International Service Centers is included at the end of Chapter 6 of this ma
93. s 7 THE FOLLOWING PARTS ARE NOT LOADED R73 R83 R85 R33 R82 R84 AND U11 ARE LOADED FOR 41B ONLY SEE SHEET 2 UNLESS OTHERWISE INDICATED RESISTANCE IS IN OHMS UNLESS OTHERWISE INDICATED CAPACITANCE IS IN UF SHEET 6 KEYPAD FOR REFERENCE ONLY FOR ASSEMBLY AND REFERENCE DESIGNATION DRAWING SEE FLUKE 39 amp 41B 4001 DRAWINGS R28 IS LOADED FOR BOTH THE 39 AND 41B SEE SHEET 3 9 gt 56 R39 021 R36 C11 Q5 R32 C12 020 Q1 R25 C10 R29 CR1 ARE LOADED ON THE FLUKE 41B ONLY SEE SHEET 3 Bottom REFERENCE DESIGNATION LAST USED NOT USED Bu __ ___ __ ____ FLUKE 4X 1021 1 OF 6 FLUKE 41B 4001 Figure 7 1 A1 Main PCA Fluke 39 and 41B 7 3 39 41 Service Manual DOUT EESER CS EESER CS EEPOT EPM7032V 3 VO1 VO17 INC_EEPOT VO2 VO18 VO3 VO19 VO4 1 020 1 05 VO21 VO6 1 022 1 07 1 023 1 08 1 024 1 09 1 025 1 1 010 1 026 UPLOW__ 27 voit 1 027 26 1012 1 028 2 1 013 1 029 23 1 014 1 030 21 1 015 VO31 24 VO16 1 032 8 L
94. solated 1 2 9 6 or 19 2 baud rate Printer graphical output in either Epson or HP format Text data is sent in ASCII format SEND Waveform Data and Picture formats may be remotely accessed Remote Trigger function 1 9 39 41 Service Manual 2 2 2 3 2 4 2 5 2 6 2 7 2 9 2 10 2 11 2 13 2 15 2 39 2 41 Introduction Chapter 2 Theory of Operation Functional Block Description eere Circuit E Power p erepto trie Normal Operation nennen ener enne Circuit Descriptions tei eroe taser Power t s as aa Power On Low Battery Detection Power Reset erh Input Conditioning eese neret nennen Difference Protection Circuit Current Channel Amplifier Voltage Input Gain Amplifier Latch U1 Anti Alias Filter eei er tene aene LE Level Shifter S A D COnverters icc on ert eret Phe eee Disit l Kernel nu ee ea anne 2 10 Digital Signal Processor 2 Programmable Logic Device eere SRAMS U5 U6 U 2 een EPROM 04 tacos sen gudrs Revera eee cera EEPROM i etat tree iet irae ERE ri Serial EEPRO
95. stallation of the FlukeView software Open Fluke View software on the PC Turn on the Tester From the FlukeViewTM toolbar choose the camera icon Communication over the serial I O port is confirmed when the picture window on the PC displays a picture of the Tester s display with the appropriate values and or waveform To confirm the print function press the Print button and confirm the Tester displays PRNT in the upper left corner of the display and the following message appears PRINTING PRESS ANY KEY TO STOP To confirm the send function press the Send button and confirm the Tester displays SEND in the upper left corner of the display The same message appears as in step 6 above 39 41 Service Manual 4 14 Calibrating the Tester 4 15 4 16 The Tester allows closed case calibration using known reference sources The meter automatically prompts you for the required reference signals measures them calculates the correction factors and stores the correction factors in the nonvolatile calibration memory The Tester has a normal calibration cycle of 1 year If the Tester fails the performance test or has been repaired it should be calibrated To meet the instrument specifications listed in Chapter 1 the Tester should be calibrated with equipment meeting the minimum specifications given in Table 4 1 Introduction The Tester is calibrated using the calibration screen Two factors are used
96. th a 24 conductor flat cable Extra logic was required to interface the display control lines to a fast DSP This logic resides in the PLD U3 2 13 39 41 Service Manual 2 41 2 42 2 43 2 44 2 45 Specifications x 128 pixels W x H e FSTN Film Compensated Super Twisted Nematic LED backlight e 32Kx8 display RAM e Integrated 1335 controller BackLight The backlight is a series of 24 yellow green Light Emitting Diodes LEDs The diodes are connected two in series and 12 in parallel The backlight control circuit switches the current and sets the level of the current to the diodes Q15 R51 R55 R57 and R60 form a level shifter to turn on control transistor 016 When 016 turns on it establishes reference voltage of 100 mV at the noninverting input of U21 U21 through Q14 forces 100 mV across the parallel combination of R54 and R59 This action causes the current through the back light to be 240 mA Contrast Control 08 The Contrast Control EEPOT is functionally the same as a regular potentiometer except that the wiper location is controlled via a digital interface instead of a knob The digital interface to this part consists of three lines chip select CS increment wiper INC and up down U D To adjust the potentiometer CS is brought low and the INC line is strobed The direction of the wiper is dependent on the state of the U D pin U8 is configured as a simple voltag
97. the instrument See Figure 4 2 The display also provides information for the RANGE that is being calibrated the voltage to APPLY to the Tester inputs and the resulting calibration FACTOR ranging is automatically taken care of by the Tester and only the calibration voltage needs to be supplied t f eps Figure 4 4 Calibration Access Hole 4 15 39 41 Service Manual 4 17 Making Calibration Adjustments The calibration step being performed is identified by an arrow on the left side of the display Each step calls for either a connection to be made or a known voltage applied to the input of the Tester Pressing Enter will either move to the next step in the case of an instruction or store the displayed calibration factor for that specific test By pressing the arrow key more than once you can bypass a step in the calibration menu When this happens you must restart the Calibration routine Note Make sure each calibration step is complete before pressing enter Press enter only once for each calibration step or instruction There will be a slight delay before the arrow moves to the next prompt or instruction on the display after pressing enter Upon completion of all calibration steps you are instructed to accept the Tester s new calibration factors by pressing 22 or cancel the calibration by turning the Tester off other button operations are ignored To capture usable calibration factors the calibrati
98. the voltage incrementally so the Tester does not autorange to the next higher range Ensure the Tester is in the appropriate range before checking the reading against the performance limits 6 Verify that the readings are within the minimum and maximum limits specified in Table 4 2 Performance Testing and Calibration 4 Performance Tests Table 4 2 Volts Performance Calibrator Performance Limits Output Fluke 39 41B V rms V pk V dc V dc Range Min Max Min Max Min Max 5 00V 20 4 4 5 6 15 0V 50 14 4 15 6 65 0V 100 63 4 66 6 130 0V 200 127 1 132 9 208 0V 500 201 215 350 0V 500 340 360 480 0V 1000 467 493 600 0V 1000 585 615 V ac 5 00V 20 4 5 5 5 6 5 7 7 15 0V 50 14 7 15 3 20 5 22 0 65 0V 100 64 4 65 6 89 8 94 1 130 0V 200 129 1 130 9 179 9 187 8 208 0V 500 205 211 285 303 350 0V 500 346 354 483 507 480 0V 1000 475 485 662 695 600 0V 1000 595 605 828 868 Testing Amps Performance Perform the following procedure to test the amps funtion of the Tester Warning Ensure that the calibrator is in standby mode before making any connection between the calibrator and Tester dangerous voltages may be preSent on the leads and connectors Press and turn on the Tester to enter the Setup screen Using and 4 select OTHER for Clamp Setting Press to exit the Setup screen Connect a cable from the Output
99. to correct each a d converter reading offset and gain AC voltages are used as inputs to both the offset and gain calculations During the offset measurement the instrument calculates the DC value of the AC input This insures that the DC values reported when AC is present are correct CV z 2x Advalue x GSF Offset CV is the calibrated value Advalue is the present reading from the a d converter GSF is the gain scale factor and Offset is the value from the calibration sequence The basic calibration consists of sets of steps for Volts banana jacks and Amps BNC inputs Both inputs are calibrated using an AC Volt Reference Source Caution Do not apply current sources to the Tester s Clamp Probe BNC connector The entire calibration process must be completed before the new calibration factors can be stored in nonvolatile memory If the calibration process is discontinued prior to completion no changes are made to nonvolatile calibration memory Entering Calibration Mode To put the Tester in the calibration mode and display the calibration screen proceed as follows 1 Allow the Tester to stabilize in an environment with an ambient temperature of 18 to 28 degrees Celsius and relative humidity of less than 70 for at least four hours Note The Cal Enable switch is located in the battery compartment of the instrument beneath a calibration seal 2 Remove the Tester s battery access lid and batteries Figure 4 2 Remov
100. tware determines which mode the instrument is in and displays the corresponding screen and information This entire sequence takes about 300 ms that is it repeats about three times per second During normal operation the instrument always operates in this sequence with one exception When the instrument is in the HOLD mode sampling and calculations are halted until the hold mode is exited or the display is changed to another screen Circuit Descriptions Power Supplies There are six power sources required for the Tester s analog digital and LCD circuits A 5 dc and 6V dc source is required for the analog section as well as a 2 1154V dc reference voltage for the a d converters The digital section requires 3 3V dc for the DSP and associated kernel components The LCD module requires 22V dc for power and a variable source of 15 to 19V dc to control the LCD contrast A power on circuit is incorporated to control the application of power to the various sections of the unit Power On Circuit The Tester has a soft key power on circuit Closing the power switch turns on Q11 This turns on Q10 which starts the switching regulator U30 To maintain power to the rest of the circuitry the microcontroller U2 sets the signal PWR ON to a high level 2 4V and starts toggling W_DOG When W DOG goes low it turns on 020 charging C71 to VCC Q9 remains on as long as the voltage on C71 remains above the threshold voltage 2 15
101. wer supply When the VCC voltage goes above 2 7 Volts 019 turns on This causes 017 to turn off and allows C46 to start charging When the voltage across C46 reaches 1 8V dc Q2 turns on pulling the RESET signal low Because both senses of the reset signal are needed Q3 inverts the RESET signal and provides the signal RESET Input Conditioning Both the voltage and current inputs provide gain adjustments and filtering of the incoming signal before it is sent on to the a d converters Difference Amplifier Voltage Input U10 and Z6 form a difference amplifier The difference amplifier improves the instrument s operation on three phase delta power systems It also provides isolation and a protective impedance in both the high and common inputs The gain of the amplifier is 1 500 Protection Circuit Current Channel R38 R18 R23 R17 Q6 and Q7 form a protection circuit to limit the input voltage and current applied to U18 during accidental overvoltages The emitter of Q7 clamps any input voltage to 10 Volts R17 further limits the current into the input of U18 to 500 uA Gain Amplifier Both the voltage and current inputs adjust the gain based on the range selected There are three hardware ranges for each input 256 512 and 1024 volts peak for the voltage input and 20 200 and 2000 Amps peak for the current input The ranges for the current input assume that the input is 1 mV Amp The gain for both inputs are contro

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