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Keysight Models 66111A, 66311A/B/D, 66309B/D Mobile

Contents

1. 15V secondary gated HEAT SINK pone d Rail Output fuse maa OUTPUT CAP SCR crowbar jumper Reverse polarity diode jumper E Cr Figure 6 1B A1 Main Board Test Points through hole boards 56 Diagrams 6 quur Wd Bolg ue4 weu ou e Bod Ao Jaya Au doo11euu josjep snas ax 1044094 waag Ao Payag 0 139r apu duy uow Buy IH Jaauques aaua Au a o4u09 9 sod pas duy uow Buy 0 Josep AO c bod AO dno L 19880AO 104u09 JeqM019 4 duy oquo9 yurqiueuno ssoJo sod Y 103005 joquod dd yw queuing sso Ban umopinug seig eDeigindno seg paleo AL Jawweiboig umog i V80EN Mo indino m 60 4 LOEL duy 9 MA YOIH NG TAL v z0 0 botze sdurej iunus Joejn amp e uindino
2. 98S ASL PID ue4 oU A92 up NG Aah g iva g A NG 98S ASL 19 eu Figure 6 4 Rail and Bias Circuits 59 P wr Yap 103808 PEDE odo L MO xnw O palad AO t e palag AD 8 cuan m gt ed snes pq 00 9 Z LISIHNI z ouo indinog 9 sawwe boidumog jur Wem ss019 indnog Z zgo J men 1ndino 6 Diagrams ts Ircul Figure 6 5 Output 2 C 60 Index OUT 41 sense 41 A A A block diagram 54 A1 board removal 38 A1 Main board 43 A2 board removal 37 A2 Interface Board 42 A2 A3 block diagram 55 56 A2S201 43 A3 board removal 38 A3 Front Panel 42 ADC 42 B_CC_Detect 45 B_CV_Detect 45 B_IMon 45 B_VMon 45 bias voltages 30 C_Mux_Ctrl 45 cal denied 33 calibration 33 calibration post repair 32 CC 30 CC line regulation 17 CC load effect 18 CC load regulation 17 CC loop 44 CC noise 18 CC operation 16 17 CC source effect 18 CC_Detect 44 CC_Detect 42 CC_Prog 43
3. NOTE Connector is removable Set to Remote through hole Set to Remote Set to Remote through hole through hole units only units onl units only DVM Scope KR or RMS DC Load DC Load voltmeter A resistor A resistor mmeter mmeter CV tests 400 ohm 400 ohm 3 B C External DVM or RMS Current DC supply voltmeter m nitor S CC tests b Notes Use dc supply with the 7 same polarity connections so ho for current sink tests Electronic s ond Replace electronic load with Load ra connect this lead only resistors for CC noise test see note C DVM connector when calibrating the unit A Set to Remote SENSE through hole D lle Local units only A remote z 1 DC aa Scope Voltmeter POETE Set to Remote i P through hole units only V External DC D I M E Supply only for Electronic verification Load Figure 2 1 Test setup Keysight 66111A 66311B D 66309B D surface moun
4. Figure 6 2 A1 Board Block Diagram 57 uuy L SH quy duet UOWA Naal xu Huoni Bold AO Bolg ue4 Bold AO z Bold 00 g Bold AD UOWA 1991 APH H Vom d uoni 19912 AO aeq snieis HOS AO yal Wd Z mg snieis Ku snieis TINO xwo Lo xw O Aqwassy Od URW Iv OL 6 Diagrams Ajqwassy eoeyelu zv vos uowwog Arepuodag av 188 Ieuueu 8 ova 88 peno ova ta ak jeng JAV Na 94 Agay 91607 Xul AZ AhAAAA TA WOH 100g Xuj AZ WOHd Soe Wodd33 So punog gem y 1043005 I ufsy feng 10 09UU09 pued 10013 quiessy joue d 1u044 eoeyeil 130 14 Jong fejdsiq eoeyeyul cecsd kedsig p u OH EISE WOH lt sng SSompy sng ewa sng pros Figure 6 3 A2 A3 Boards Block Diagram 58 Diagrams 6 w02 Ud Ud NG oN of to Gel Gi ASt 98S ASF uo 99S 98S AG voen
5. Ao r2 o pa pa DN oo o EN Rdbk 16bit 30 pin IMon L 28 pin C Mux Ctrl 30 pin CC_Detect 28 pin Status_Detect 30 pin CV_Detect 28 pin Status Ctrl 2 30 pin only NIN NIN r2 N v ON tA wo dv o NI N NI NI oo nN Nn NI NO LA 33 3 Troubleshooting Manual Fan Speed Control Under some circumstances such as testing acoustical devices where the fan noise would interfere with the test it would be advantageous to reduce the fan speed If the test requires a very light load the ambient temperature is low and the duration of the test is short the fan speed may be temporarily reduced The turn on default is Automatic so this procedure must be performed as needed every time the line voltage is turned on To manually control the fan speed a Simultaneously depress the 0 and 1 keys EEINIT lt model gt will be displayed b Using the Up Down annunciator keys select FAN MODE lt AUTO gt c Using the Up Down arrows select FAN MODE MAN d Press Enter e Simultaneously depress the 0 and 1 keys EEINIT model will be displayed f Using the Up Down annunciator keys select FAN SPEED data g Press Enter Number h Enter the desired speed numeric entry range is 0 to 100 Press Enter m Disabling Protection Features The dc source s protection features may be disabled This is not recommended as a normal operating condition but is helpful un
6. eae THROUGH HOLE UNITS ONLY refer to title page for serial numbers 66311 61025 66311A B Tested PCA through hole 5064 0085 66311A B Tested Interface PCA for through hole units 5063 3430 Tested Printed Circuit Assembly PCA only 1 66311A Binding Post PCA 1 F301 Fuse 1AT 250V rear mounted 230Vac input 2110 0303 Fuse 2AT 250V rear mounted 115Vac input F302 04 07 3 F303 05 06 2110 0699 Fuse submin 5AM 125V F308 310 2110 0699 Fuse submin 5AM 125V F309 2110 0951 1 Fuse submin 5AT 125V 0960 0892 Rotary pulse generator 5080 2600 1 66311A AC calibration switch with R415 9100 5232 Main Power Transformer T 06611 80003 Primary Power Cable T1 to Al E312 313 06611 80004 1 50802452 1 50802457 1 50802448 1 06611 60056 2 06611 80007 1 A3 A4 B1 G1 Sl 1 WI w2 W3 WA W6 W7 WS 06611 80006 1 Secondary Power Cable T1 to J303 50 Replaceable Parts List 5 Table 5 2 Chassis Mechanical Part_Number Description k4 SURFACE MOUNT UNITS ONLY refer to title page for serial numbers 5002 1519 33120 40200 66311 80002 Nameplate 66311B 66311 80003 Nameplate 66311D 66309 80001 Nameplate 66309B 66309 80002 Nameplate 66309D Window 0515 0433 Screw MAx0 7x16mm Option 521 board 2 2 2 2 MP29 0360 2670 Screw DVM board MP30 5080 2637 Front Panel Keypad Label 51 5 Replaceable Parts List Table 5 2 Chassis Mechan
7. 44 CC Prog2 45 clear password 32 constant current tests 16 constant voltage tests 14 Control 43 44 Control 2 45 copyrights 5 cover removal 37 current monitoring resistor 13 current sink 16 17 CV 30 CV load effect 14 CV loop 44 CV Noise 15 CV source effect 14 CV CC control 43 44 45 CV Detect 44 CV Detect 42 CV Prog 43 44 CV Prog2 45 DAC 42 disable protection 32 disassembly tools 35 disassembly procedure 35 downprogramming 43 44 DP Control 43 DVM circuits 46 E EEPROM 43 electronic load 13 electrostatic discharge 10 error codes 29 F fan speed 32 Fan Prog 43 44 firmware revisions 10 33 FLT 41 front panel removal 37 H hazardous voltages 9 history 5 HP IB 41 HS Therm 43 identification 5 IDN query 33 Imon H 43 44 Imon_L 43 Imon P 43 INH 41 inhibit calibration 33 initialization 33 interface signals 41 61 Index J207 voltages 31 manual revisions 10 notice 5 Option 521 46 OUT 41 out of range 32 OV_Detect 44 OV_Detect 42 OV_Prog 43 OV SCR 42 44 p PARD 15 18 password 32 performance test form 19 performance tests 13 PM Inhibit 44 power on self test 29 primary interface 42 printing 5 programming 13 programming and output values 13 protection 32 R rail and bias circuits 57 58 readback accuracy 14 reference voltages 30 Relay
8. Program the current to full scale and the output voltage to the maximum programmable voltage value Vmax in Table 2 2 c Adjustthe load in the CV mode for the UUT full scale voltage in Table 2 2 as indicated on the front panel display Check that the CC annunciator of the UUT is on If it is not adjust the load so that the output voltage drops slightly d Record the output current reading DVM reading current monitor resistance value in ohms You may want to use the average reading program described under CC Load and Line Regulation e Short the load switch and record the output current reading The difference in the current readings in steps d and e is the load effect and should not exceed the limit specified in the performance test record card for the appropriate model under CC Load Effect CC Source Effect This test measures the change in output current that results when the AC line voltage changes from the minimum to the maximum value within the specifications a Turn off the dc source and connect the ac power line through a variable voltage transformer b Connect the output terminals as shown in Figure 2 1a with the DVM connected across the current monitoring resistor Set the transformer to the nominal line voltage c Turnon the dc source and program the current to the full scale value and the output voltage to the maximum programmable value Vmax in Table 2 2 d Adjustthe load in the CV mode for full scale voltage
9. terminals Set the scope s bandwidth limit to 20 MHz and use an RF tip on the scope probe b Turnon the dc source and program the current to the maximum programmable value Imax and the output voltage to the full scale value in Table 2 2 c Adjustthe load for the full scale current value in Table 2 2 as indicated on the front panel display d Note that the waveform on the oscilloscope should not exceed the peak to peak limits in the performance test record card for the appropriate model under CV Noise PARD e Disconnect the oscilloscope and connect an ac rms voltmeter in its place The rms voltage reading should not exceed the RMS limits in the performance test record card for the appropriate model under CV Noise PARD Transient Recovery Time This test measures the time for the output voltage to recover to within the specified value following the specified load change in High capacitance mode The focus of the output 1 transient is on the initial dip below zero D p 2 pr 3 Bou mad 4 D Load ng Transient Bx it efe cil Hi 20 0 us div elt Joao e r 504 mv Sib Waveform A output 1 Waveform B output 2 Figure 2 2 Transient Waveforms 15 2 Verification and Performance Tests Turn off the dc source and connect the output as in Figure 2 1d with the oscilloscope and the RC network across the and load terminals Connect everything at the load and keep the load leads as
10. with this manual 2 If the first four digits of the serial number of your unit are lower than those shown on the title page your unit was made before the publication of this manual and may be different from that described here Such differences if any will be covered in a backdating section in chapter 6 Firmware Revisions You can obtain the firmware revision number by either reading the integrated circuit label or query the dc source using the GPIB IDN query command see chapter 3 ROM Upgrade Electrostatic Discharge CAUTION The dc source has components that can be damaged by ESD electrostatic discharge Failure to observe standard antistatic practices can result in serious degradation of performance even when an actual failure does not occur When working on the dc source observe all standard antistatic work practices These include but are not limited to e Working at a static free station such as a table covered with static dissipative laminate or with a conductive table mat P N 9300 0797 or equivalent e Using a conductive wrist strap such as P N 9300 0969 or 9300 0970 e Grounding all metal equipment at the station to a single common ground e Connecting low impedance test equipment to static sensitive components only when those components have power applied to them e Removing power from the dc source before removing or installing printed circuit boards 10 Verification and Performance Tests Introduc
11. A 0 1 ohm 0 04 TC 5ppm C Guildline 9230 15 Load Resistor 400 verification p n 0811 0942 3 W min TC 20ppm C 80022 calibration p n 0811 0600 Electronic Load 20V 5A minimum with transient capability and a Keysight N3300A mainframe slew rate of 833kA s or better with N3303A module DC Power Supply 8V SA for current sink verification calibration Keysight 6611C 6631B 25 V source for DVM verification calibration 6631C or 6633B GPIB Controller Full GPIB capabilities only required if you are HP Series 200 300 or calibrating the unit over the GPIB equivalent Oscilloscope Sensitivity mV Keysight 54504A or Bandwidth Limit 20 MHz equivalent Probe 1 1 with RF tip 11 2 Verification and Performance Tests RMS Voltmeter True RMS Keysight 3400B or Bandwidth 20 MHz equivalent Sensitivity 100 uV Variable Voltage Transformer Adjustable to highest rated input voltage range Power 500 VA RC network for transient Capacitor fixed film 25uF 50V Kit p n 6950L T03 response test Resistor 0 25Q IW Measurement Techniques Test Setup All tests are performed at the rear terminals of the supply as shown in Figure 2 1 Measure the dc voltage directly at the S and S terminals Connect the output for remote sensing Use adequate wire gauge for the load leads IL Sense lilim Local M remote s e lo see s uu lo SENSE S was Z aa Local Ab Genee BL Remote
12. A3 Yes v Protect annunciator Replace A2 on Check for OV setting Voltage setting If OK replace A1 Checkthat OCP is not enabled If OK replace A1 No v For OT check fan If OK replace A1 Check A1 F309 output fuse No Output Yes Check Opt 521 board cables If OK replace A1 Go to Sheet 2 Figure 3 1 Sheet 1 Troubleshooting Flowchart 27 3 Troubleshooting ETUR From Sheet 1 Enable output and program voltage and current full scale with no load Measure output voltage Checkto insure OV setting is not less than the voltage setting If not replace A1 Output out of spec Calibrate voltage but close Calibrate voltage If sti wrong or will not calibrate replace A2 Output OK but meter wrong CV Prog amp CC Prog OK see Table 3 4 Check cable W12 If OK replace A1 Output voltage 1096 error No i Program the OV 2 volts lower than the output Replace A2 voltage Calibrate OV If OV is still not functioning properly check W12 If OK replace A1 Program OV to full scale Yes Go to Sheet 3 Replace A2 Figure 3 1 Sheet 2 Troubleshooting Flowchart 28 Troubleshooting 3 From Sheet 2 Program current to full scale voltage to Vmax and load to the power s
13. D and 66309B D Mobile Communications DC Sources Rail fuse 5V 15V bias fuses 12V bias for output 2 pin 15 5V bias for output 2 pin 16 Common for Output 2 Output 2 fuse Rail fuse Line fuse Rail for output 2 R419 J804 DN GPIB bias fuse 15V jumper R422 Rail I 3 HEAT SINK R423 5V bias for output 2 pin 1 J800 C753 Fees Ea Ng 15V jumper Downprogrammer fuse J307 Te 2 5V reference C753 5V jumper Output fuse ax Common for Main Output o CC Control Loop CV Control Loop Output 2 Figure 6 1A A1 Main Board Test Points surface mount boards 55 6 Diagrams 5V 15V bias fuses 5V GPIB bias fuse Rail Rail bias fuses J304 J305 00900 looo F306 a SEN em 5V Primary ea Downprogrammer fuse 2 5V Reference pin 6 45V Secondary 15V secondary 15V Secondary 15V secondarygated
14. FRONT OF UNIT blue strip faces forward A3 FRONT PANEL 7 BOARD RANSFORMER A2 INTERFACE BOARD shown flipped over with component side up To transformer see Fig 3 6 To transformer PITS see Fig 3 6 w3 A1 MAIN BOARD blue strip faces down blue strips face up w10 blue strip blue strips face back RE 4 faces forward HEATSINK blue strips face back _ A6 OPTION 521 RELAY BOARD NOTE If relay board is not installed cable W9 connects J210 to J804 J620 IU blue strip faces up W1 T A5 DVM NN BOARD BACK OF UNIT Figure 3 4 Cable Locations 38 Troubleshooting 3 Cover Removal and Replacement a Using a T15 Torx screwdriver unscrew the two captive screws that hold the rear bezel on the unit b Remove the two screws from the bottom of the case c Slide the cover back until it clears the rear of the dc source A2 Interface Board Removal and Replacement To remove the Interface Board proceed as follows a Remove the cover of the dc source as described under Cover Removal and Replacement b Remove the two 7 mm and two 3 16 inch hex screws that hold the GPIB and RS 232 connectors in place c Slide the board forward lift up
15. circuits Option 521 46 replaceable parts chassis 47 revisions 10 RmHi 44 RmLo 44 ROM upgrade 33 RPG 42 RS 232 41 S safety considerations 9 safety summary 3 SCR 44 secondary interface 42 self test 29 sense 41 sense switch 44 serial number 5 62 series regulator 43 shunt clamp 44 status annunciators 30 T Temp_Amb 43 test equipment 11 test setup 12 trademarks 5 transformer removal 39 transient recovery 15 troubleshooting bias and reference supplies 30 troubleshooting equipment 24 troubleshooting flowcharts 24 troubleshooting introduction 23 troubleshooting overall 24 troubleshooting status annunciators 30 U UNR 30 V verification tests 13 VMon 43 44 voltage programming 14 W warranty 2 For instruments with Serial Numbers 66111A 66311A 66311B 66311B 66311D 66309B 66309D US38460101 and up through hole US38180101 through US381 80408 through hole US38440101 through US38442274 through hole US38442500 and up surface mount US39010101 and up surface mount US39050101 and up surface mount US39070101 and up surface mount aN enn 63 This information is subject to change without notice Keysight Technologies 1999 2001 2005 2014 Edition 2 December 2014 KEYSIGHT RIA 5964 817 TECHNOLOGIES 64 8176 www keysight com
16. more and increase the output current When the downprogramming FET is turned on in either CV or CC mode current is conducted away from the load which speeds up downprogramming During operation an Inhibit_2 signal causes the Output Regulator to turn off if any of the following occur The output 2 is programmed off The line voltage falls below 90 volts approximately Current readback is provided by a multiplexer that alternately reads both output voltage and output current Switches at the front end of the multiplexer toggle between the B_Imon and the B_Vmon signal depending on whether the C Mux Ctrl 1 signal is high or low When the signal is low the output voltage is read When the signal is high the output current is read A5 DVM Circuits The circuits on the A5 DVM board measure the voltage signal applied to its input terminals Differential amplifiers on the A5 board amplify and subtract the and DVM inputs and create an output signal referenced to Output 1 common The resultant signal is transferred from the A5 board to the A2 interface assembly via cable W13 All analog to digital conversion functions are accomplished on the A2 interface board using the same ADC circuits that are used to perform the readback functions on the dc source output Because the inputs to these measurement circuits are multiplexed you cannot simultaneously make DVM measurements while measuring the dc source output Also because the measurement circuit
17. on the side of the board closest to the heatsink and slide the board out d Place a piece of non conducting material stiff paper or cardboard on top of the transformer flip the interface board over and place it on top of the non conducting material e Unplug the 3 conductor cable from J206 Push down on the locking tab to release the connector f Unplug the ribbon cables Note the position of the blue conductive side for reinstallation as shown in figure 3 4 Release the cable by pulling out the end tabs as shown by the arrows in figure 3 5 T a Figure 3 5 Cable Release g To reinstall the Interface board perform steps a through e in reverse order Front Panel Assembly Removal and Replacement This procedure removes the front panel assembly from the dc source a Remove the cover as described earlier in Top Cover Removal and Replacement b Usinga Torx T10 driver remove the screw from the right side of the supply that holds the front panel bracket to the chassis c Locate and carefully peel off the left vinyl trim to gain access to the side screw that secures the front panel to the chassis Using a Torx T15 driver remove the screw located behind the vinyl trim d Place the power switch in the on position Slide the switch extension forward as far as it can go and lift it up to disengage from switch Remove the extension from the unit e Rotate the front panel forward from right side to disengage the left mounting stu
18. output voltage is monitored through the S and S sensing terminals If local sensing is being used the output voltage is monitored at the output terminals If remote sensing is being used the output voltage is monitored where the remote sense leads are connected to the load If the output voltage goes higher than the programmed value the downprogramming stage is turned on With the CC loop in control the output current is regulated by comparing the programmed current signal CC Prog 0 to 5V with the output current monitor signal Imon H The Imon H signal is produced by measuring the voltage drop across current monitoring resistor and is in the 0 to 3 5 V range which corresponds to the zero to full scale output current range If the output current exceeds the programmed value the Control signal goes low causing the output regulator to conduct less and thus decrease the output current Conversely if the output current is less than the programmed value the Control signal goes high causing the output transistors to conduct more and increase the output current A positive gross current limit circuit protects the output if the output current exceeds the maximum current rating of the unit A negative gross current limit prevents the unit from sinking too much current When the downprogramming stage is turned on in either CV or CC mode the CV CC control circuit causes the Control signal to go low which in turn causes the downprogramming transistors
19. secured to the side of the chassis near the AC input by a Torx T15 screw f Remove the three Torx T15 screws that secure the main control board to the chassis g Slide the main board towards the front panel to release it from chassis mounted standoff Carefully lift the board 40 out of the chassis Troubleshooting 3 T1 Power Transformer Removal and Replacement NOTE The transformer primary connections are line voltage dependent Figure 3 6 illustrates the primary wiring configuration of the power transformer for various ac line voltages To remove the power transformer the front panel assembly must first be removed to gain access to the bracket screws that hold the transformer in place a Remove the front panel assembly as previously described b Remove the two Torx T10 screws securing the rear of the transformer bracket to the bottom of the chassis and the two Torx T10 screws securing the front of the bracket c Use long nose pliers to disconnect all wires going to the transformer terminals d Lift the transformer out of the chassis CAUTION Install the correct fuse when changing the ac line voltage from a previous setting for 110 120 Vac 3 15 AT 250V p n 2110 0638 for 220 230 Vac 1 6 AT 250V p n 2110 0773 The fuse is located on the Al Main board assembly right behind the line switch orange spare f 120 VAC 220 VAC orange Top part of white violet t
20. short as possible To reduce noise twist the sense lead pair together Also twist the load lead pair together Set the compensation to High capacitance mode Turn on the dc source and program the output current to the maximum programmable value Imax and the voltage to the full scale value in Table 2 2 Set the load to the Constant Current mode For output 1 program the load current to 0 1A For output 2 program the load current to 0 75A Set the electronic load s transient generator frequency to 100 Hz and its duty cycle to 50 For output 1 program the load s transient current level to 1 5A For output 2 program the load s transient current level to 1 5A Turn the transient generator on Set the oscilloscope for negative edge triggering and adjust it for a waveform similar to that in Figure 2 2 The output voltage should return to within the specified voltage in less than 35 microseconds for output 1 and less than 400 microseconds for output 2 following the specified load change Record the voltage at time t in the performance test record card under CV Transient Response Constant Current CC Tests CC Setup Follow the general setup instructions in the Measurement Techniques paragraph and specific instructions given in the following paragraphs Current Programming and Readback Accuracy This test verifies that the current programming and High range readback are within specification a Turn off the dc source and connect
21. third and fourth digits specify the week of the year 45 the forty fifth week The last four digits 0101 are a unique sequential number assigned to each unit Table of Contents Warranty Information Safety Summary Notice Printing History Instrument Identification Table of Contents 1 INTRODUCTION Organization Safety Considerations Related Documents Revisions Manual Revisions Firmware Revisions Electrostatic Discharge 2 VERIFICATION AND PERFORMANCE TESTS Introduction Test Equipment Required Measurement Techniques Test Setup Electronic Load Current Monitoring Resistor Operation Verification Tests Performance Tests Programming Constant Voltage CV Tests CV Setup Voltage Programming and Readback Accuracy CV Load Effect CV Source Effect CV Noise PARD Transient Recovery Time Constant Current CC Tests CC Setup Current Programming and Readback Accuracy Low Current Range Readback Accuracy Low Current Sink Operation High Current Sink Operation CC Load and Line Regulation CC Load Effect CC Source Effect CC Noise PARD DVM Tests DVM Measurement Accuracy Performance Test Equipment Form Performance Test Record Form eU Ui Un Lu FA 3 TROUBLESHOOTING Introduction Test Equipment Required Overall Troubleshooting Flow Charts Specific Troubleshooting Procedures Power on Self test Failures Bias and Reference Supplies CV CC Status Annunciators Troubleshooting J307 Voltage Measurements Manual Fan Spee
22. to conduct current away from the load and speed up downprogramming During operation a PM Inhibit signal will cause the output stage bias shutdown circuit to turn off the gated 15 V bias voltages and shut down the output if any of the following occur The output is programmed off An overvoltage condition is detected OV Detect signal is received The line voltage falls below 90 volts approximately 46 Principles of Operation 4 Current readback is provided by three separate circuits The previously discussed high range current signal Imon_H returns the high range currrent measurement When the unit is operating in the low current readback mode a separate low range current shunt and amplifier provides low current readback via the Imon_L signal A shunt clamp Q302 and Q304 clamps the voltage across RmLo to approximately 1 5 V The third current readback circuit consists of a high bandwidth current amplifier that returns dynamic current measurements from the output filter capacitor via the Imon_P signal Note that the Imon_H and the Imon_P signals are combined to return the actual output current measurement An overvoltage detect circuit compares the output voltage to the programmed overvoltage setting When the output exceeds the programmed setting the OV_Detect signal goes low which informs the logic array that an OV condition has occurred The crowbar control circuit is enabled when the OV_SCR signal is received When an overvol
23. 2A Program the output voltage to OV and the current to the full scale value in Table 2 2 The current on the UUT display should be approximately OmA Verification and Performance Tests 2 Record the current reading on the DMM and the reading on the front panel display The difference between the two readings should be within the limits specified in the performance test record card under Low Range Current Readback 0A Program the output voltage to 8V and record the current reading on the DMM and the reading on the front panel display If the meter indicates overrange lower the 8 volts slightly The difference between the readings should be within the limits specified in the performance test record card for the appropriate model under Low Range Current Readback 9 20mA Low Current Sink Operation This test verifies current sink operation and readback of the 0 02A range a Turn off the dc source and connect the output and an external supply as shown in Figure 2 1c using the 400 ohm load resistor Set the DMM to operate in current mode Turn on the dc source and set the current range readback to 0 02A Turn on the external power supply and program it to 8V and 5A Then program the dc source to OV and 1A If the meter indicates overrange lower the voltage of the external supply slightly The UUT display should read approximately 20 mA Record the current reading on the DMM and the reading on the front panel display The differ
24. DC Source KEYSIGHT TECHNOLOGIES Keysight Models 66111A 66311A B D 66309B D Mobile Communications Service Manual NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com KEYSIGHT TECHNOLOGIES Warranty Information CERTIFICATION Keysight Technologies certifies that this product met its published specifications at time of shipment from the factory Keysight Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Keysight Technologies hardware product is warranted against defects in material and workmanship for a period of one year from date of delivery Keysight Technologies software and firmware products which are designated by Keysight Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Keysight Technologies will at its option either repair or replace products which prove to be defective Keysight Technologies do
25. E80 Dig T O test failed SEC PCLR written low and high read back A2 Interface Bd through Xilinx 31 3 Troubleshooting Bias and Reference Supplies Before troubleshooting any circuit check the bias and or reference voltages to make sure that they are not the cause Table 3 3 lists the bias and reference voltage test points for the A1 Main Control A2 Interface and the A3 Front Panel Display boards Unless otherwise noted all voltages are measured with respect to secondary common R899 on surface mount units R431 4 on through hole units with no load on the supply Table 3 3 Bias and Reference Voltages Bas test Point Common 5V primary Al J206 1 Red Chassis J206 2 black 5V 0 15V 5V secondary Al R423 A1 R431 4 through hole 5V 0 2V A R899 surface mount 15V secondary Al R419 A1 R431 4 through hole 15V 0 6V A1 R899 surface mount 15V secondary Al R422 A1 R431 4 through hole 15V 0 6V A1 R899 surface mount 15V secondary gated Al F304 A1 R431 4 through hole 14 2V 5 A R899 surface mount 15V secondary gated Al F302 A1 R431 4 through hole 14 2V 5 A1 R899 surface mount Al C753 surface mount Al R899 surface mount 5V bias Output 2 Al UB760 16 R885 5V 0 2V 12V bias Output 2 Al UB760 15 R885 12V 0 5V Measured at nominal ac input line voltage CV CC Status Annunciators Troubleshooting The CV CC annunciators are particularly helpful when tr
26. Effect saw 5mV PARD Ripple and Noise RMS peak to peak A Lr EE Voltage in 35 us 20 mV Constant Current Tests 1mvV 6mV Load Effect 20mv tt nt EM High Range Current Programming and Readback Low current 0A Iout 2 3 mA High Current Full Scale 2 99717 A 2 3 mA 3 00283 A Front Panel Display Readback Iout Iout 15mA Iout 15mA Current Sink High Current 2A 7 5V Readback Isink 13 mA Isink 13 mA Load Effect 0 75mA T 0 75mA Source Effect 0 75mA 0 75mA PARD Current Ripple and Noise RMS 2 0 mA 2 0 mA 21 2 Verification and Performance Tests Model Keysight 66311B D Report No Model Keysight 66309B D output 1 Test Description Minimum Maximum Specification Specification CONSTANT VOLTAGE TESTS Voltage Programming and Readback Low Voltage 0 V Vout 10 mV 10 mV Front Panel Display Readback Vout 5 mV Vout 5 mV High Voltage Full Scale Vout 14 9825 V 15 0175 V Front Panel Display Readback Vout 9 5mV Vout 9 5 mV CV Load Effect CV Source Effect as p PARD Ripple and Noise RMS A tImV Nu e Legd Voltage in 35 us 20 mV CONSTANT CURRENT TESTS Current Programming and Readback Low current 0 A Iout 2 3 mA Front Panel Display Readback Tout 0 5mA High Current Full Scale Iout 2 99717 A Front Panel Display Readback Tout 6 5mA Low Range Current Readback Front Panel Display Readback 0 A Iout 2 5 uA Tout 2 5
27. LA Front Panel Display Readback 20 mA Iout 22 5 uA Tout 22 5 pA 2 3mA Iout 0 5mA 3 00283 A Iout 6 5mA Current Sink Front Panel Display Readback 9 20 mA Isink 22 5 uA Front Panel Display Readback 3 A Isink 5 1 mA CC Load Effect CC Source Effect 0 75mA PARD Current Ripple and Noise RMS N A Isink 22 5 pA Isink 5 1 mA 0 75mA 0 75mA 22 Verification and Performance Tests 2 Test Description Minimum Specification CONSTANT VOLTAGE TESTS Maximum Specification Voltage Programming and Readback Output 2 Low Voltage 0 V 40 mV 40 mV Vout2 15 mV 12 064 V Vout2 39 mV 6mV 1mvV 4 5 mA 1 5075 A Iout2 6 mA Isink 39 mA Output 2 Front Panel Display Readback Vout2 15 mV Output 2 High Voltage Full Scale 11 936 V Output 2 Front Panel Display Readback Vout2 39 mV Load Effect Source Effect PARD Ripple and Noise Peak to Peak N A RMS with phone capacitance lt 6uF N A Time in 400 us 20 mV CONSTANT CURRENT TESTS Current Programming and Readback Output 2 Low Current 0 A 4 5 mA Output 2 High Current 2 Full Scale 1 4925 A Output 2 Front Panel Display Readback Iout2 6 mA Current Sink 0 032A 7 5V Readback Isink 25 mA PARD Current Ripple and Noise RMS N A 2 0mA Load Effect 0 375 mA 0 375 mA Source Effect 0 25 mA ae 0 25 mA Following a 0 75A to 1 5A load change Test Descriptio
28. RRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES KEYSIGHT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contacts product maintenance agreements and customer assistance agreements are also available Contact your nearest Keysight Technologies Sales and Service office for further information on Keysight Technologies full line of support programs Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements WARNING Servicing instructions are for use by service trained personnel To avoid dangerous electrical shock do not perform any servicing unless you are qualified to do so Some procedures described in this manual are performed with power supplied to the instrument while its protective covers are removed If contacted the energy available at many points may r
29. Torx screwdriver unscrew the two screws that attach the board to the chassis To reinstall the Option 521 board perform the above steps in reverse order A7 DVM Board not on all models Remove the top cover and flip over the A2 Interface board as previously described If your unit has an Option 521 board remove the two screws that attach the board to the chassis and move the board out of the way Unplug the ribbon cable from the DVM board Note the position of the blue conductive side for reinstallation as shown in figure 3 4 Release the cable by pulling out the end tabs as shown by the arrows in figure 3 4 Using a 2 Pozidrive unscrew the screw that attaches the board to the chassis To reinstall the DVM board perform the above steps in reverse order A1 Main Control Board a Remove the top cover and the A2 Interface board as previously described b Place the power switch in the on position Slide the switch extension forward as far as it can go and lift it up to disengage from switch Remove the extension from the unit c Ifyourunit has a DVM board or an Option 521 board remove these boards as previously described d Disconnect all cables going to connectors on the main control board NOTE Be sure to note the position and orientation of all cables prior to removal so that no mistake is made when reinstalling these cables see figure 3 4 e Disconnect the ground wire between the main board and the chassis This wire is
30. WARNING Hazardous voltages exist within the dc source chassis This dc source is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power source equipped with a 3 wire ground receptacle Refer to the Safety Summary page at the beginning of this manual for general safety information Before operation or repair check the dc source and review this manual for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the manual Related Documents The following documents are shipped with your dc source a User s Guide part number 5964 8125 containing installation operating programming and calibration information 1 Introduction Revisions Manual Revisions This manual was written for dc sources that have the same manufacturing dates the first four digits as those listed on the title page and whose unique identification number the last four digits are equal to or higher than those listed in the title page NOTE 1 If the first four digits of the serial number of your unit are higher than those shown in the title page your unit was made after the publication of this manual and may have hardware or firmware differences not covered in this manual If they are significant to the operation and or servicing of the dc source those differences are documented in one or more Manual Change sheets included
31. age drop high enough to measure with the RMS voltmeter Leads should be as short as possible to reduce noise pick up An electronic load may contribute ripple to the 2 measurement so if the RMS noise is above the specification a resistive load may have to be substituted for this test b Check the test setup for noise with the dc source turned off Other equipment e g computers DVMs etc may affect the reading c Turn on the dc source and program the current to full scale and the output voltage to the maximum programmable value Vmax in Table 2 2 d The output current should be at the full scale rating with the CC annunciator on e Divide the reading on the rms voltmeter by the current monitor resistance to obtain rms current It should not exceed the values listed in the performance test record card under CC Noise RMS DVM Tests DVM Measurement Accuracy This test verifies the DVM measurement accuracy a Turn off the dc source and connect the external DMM and the external power supply to the DVM inputs as shown in figure B 1e Connect only the negative output lead of output 1 to the DVM inputs Then turn on the dc source and select output 1 b Setoutput 1 to zero volts and the external power supply to 25 volts c Record the external 3458 DMM reading and the internal DVM reading The difference should be within the positive limits specified for the DVM in Table A 3 d Setoutput 1 to 15 V and repeat step
32. as indicated on the front panel display Check that the CC annunciator of the UUT is on If it is not adjust the load so that the output voltage drops slightly e Adjustthe transformer to the lowest rated line voltage refer Table A 2 in Appendix A of the User s Guide under Mains Input Ratings f Record the output current reading DVM reading current monitoring resistor in ohms You may want to use the average reading program described under CC Load and Line Regulation g Adjustthe transformer to the highest rated line voltage refer Table A 2 in Appendix A of the User s Guide under Mains Input Ratings h Record the output current reading again The difference in the current readings in steps f and h is the CC source effect and should not exceed the values listed in the performance test record card under CC Source Effect 18 Verification and Performance Tests CC Noise PARD Periodic and random deviations PARD in the output combine to produce a residual ac current as well as an ac voltage superimposed on the dc output Constant current CC PARD is specified as the rms output current in a frequency range 20 Hz to 20 Mhz with the dc source in CC operation a Turn off the dc source and connect the load monitoring resistor and rms voltmeter as shown in Figure 2 1a The current monitoring resistor may have to be substituted by one with a higher resistance and power rating such as a 1 ohm 50W to get the RMS volt
33. c e Reverse the leads of the external power supply to the DVM inputs Keep other connections the same f With output 1 set to 15 V lower the voltage on the external power supply until the external 3458 DMM reads 4 5 V g Record the external 3458 DMM reading and the internal DVM reading The difference should be within the negative limits specified for the DVM in Table A 3 h Setoutput 1 to zero volts and repeat step g 19 2 Verification and Performance Tests Performance Test Equipment Form Test Facility Report Number Date Customer Tested By Model Ambient Temperature C Serial No Relative Humidity Options Nominal Line Frequency Firmware Revision Special Notes Test Equipment Used Description Model No Trace No Cal Due Date AC Source DC Voltmeter RMS Voltmeter Oscilloscope Electronic Load Current Shunt 20 Verification and Performance Tests 2 Performance Test Record Form Model Keysight 66111A Report No ia Test Description Minimum Results Maximum Specifications Specifications Constant Voltage Tests Voltage Programming and Readback Low Voltage OV Vout 10mV 10 mV Vout 5 mV 15 0175 V Vout 9 5 mV Front Panel Display Readback Vout 5 mV High Voltage Full Scale Vout 14 9825 V Front Panel Display Readback Vout 9 5mV Source
34. d Control Disabling Protection Features Post repair Calibration Calibration Password Inhibit Calibration Switch Initialization ROM Upgrade Identifying the Firmware Upgrade Procedure Disassembly Procedures List of Required Tools Cover Removal and Replacement A2 Interface Board Removal and Replacement Front Panel Assembly Removal and Replacement A3 Front Panel Board Removal and Replacement A6 Option 521 Relay Board not on all models A7 DVM Board not on all models A1 Main Control Board T1 Power Transformer Removal and Replacement 4 PRINCIPLES OF OPERATION Introduction I O Interface Signals A3 Front Panel Circuits A2 Interface Circuits Primary Interface Secondary Interface A1 Main Board Circuits Power Circuits Control Circuits Output 2 A5 DVM Circuits A6 Option 521 Relay Circuits 5 REPLACEABLE PARTS LIST Introduction 6 DIAGRAMS Introduction INDEX Manual Updates 49 49 55 55 61 Introduction Organization This manual contains information for troubleshooting and repairing Keysight 66111A 66311A 66311B 66311D 66309B and 66309D Mobile Communications DC Sources Hereafter all models will be referred to as the dc source This manual is organized as follows Chapter 1 Organization Chapter 2 Performance tests Chapter 3 Troubleshooting procedures Chapter 4 Principles of operation on a block diagram level Chapter 5 Replaceable parts Chapter 6 Diagrams Safety Considerations
35. d card for the appropriate model under Voltage Programming and Readback Full Scale CV Load Effect This test measures the change in output voltage resulting from a change in output current from full load to no load a Turn off the dc source and connect a DVM directly across the S and S terminals as shown in Figure 2 1a b Turn on the dc source and program the current to the maximum programmable value Imax and the voltage to the full scale value in Table 2 2 c Adjustthe load for the full scale current in Table 2 2 as indicated on the front panel display The CV annunciator on the front panel must be on If it is not adjust the load so that the output current drops slightly d Record the output voltage reading on the DVM connected to S and S e Open the load and again record the DVM voltage reading The difference between the DVM readings in steps d and e is the load effect voltage and should not exceed the value listed in the performance test record card for the appropriate model under CV Load Effect CV Source Effect This test measures the change in output voltage that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications a Turn off the dc source and connect the ac power line through a variable voltage transformer b Connect the output as shown in Figure 2 1a with the DVM connected between the S and the S terminals Set the transformer to nominal line vol
36. der some circumstances such as troubleshooting The turn on default is NO PROTECT OFF protection enabled so this procedure must be performed as needed every time the line voltage is turned on The overvoltage protection function is not disabled by this procedure To disable the protection a Simultaneously depress the 0 and 1 keys EEINIT lt model gt will be displayed b Using the Up Down annunciator keys select NO PROTECT OFF c Using the Up Down arrows select NO PROTECT ON d Press Enter Post repair Calibration Calibration is required annually and whenever certain components are replaced If either A1 or A2 are replaced the supply must be re calibrated as described in Appendix B of the User s Guide If the Interface board A2 is replaced the supply must be initialized first see Initialization later in this chapter and then be calibrated Calibration Password In order to enter the calibration mode you must use the correct password as described in Appendix B of the User s Guide As shipped from the factory the number 0 zero is the password If you use an incorrect password OUT OF RANGE will appear on the display for front panel calibration or error code 402 occurs for GPIB calibration and the calibration mode will not be enabled If you have changed the password and have forgotten it you can set the configuration switch on A2 Interface board to bypass the password See Calibration Switch paragraph ab
37. ds Pull the entire panel forward Be careful not to break the Front panel ribbon cable To remove the ribbon cable you must first remove the front panel board from the front panel assembly f Toremove the right bracket depress the plastic tab located behind the front panel in the upper right corner g Toreinstall the Front Panel Assembly perform the above steps in reverse order 39 3 Troubleshooting A3 Front Panel Board Removal and Replacement First remove the front panel assembly as described under Front Panel Assembly Removal and Replacement Once you have access to the front panel board perform these steps a b C d Remove the RPG knob by pulling it away from the front panel Pull back the right side of the board near the RPG about 1 8th of an inch Slide the board to the left to disengage the holding clips Once the board is free you can remove the ribbon cable see figure 3 5 To reinstall the Front Panel board perform the above steps in reverse order A6 Option 521 Relay Board not on all models a b C Remove the top cover and flip over the A2 Interface board as previously described Unplug the wiring harness from J620 Push down on the locking tab to release the connector Unplug the ribbon cables Note the position of the blue conductive side for reinstallation as shown in figure 3 3 Release the cable by pulling out the end tabs as shown by the arrows in figure 3 5 Using a T15
38. ence between the two readings should be within the limits specified in the performance test record card under Current Sink Readback 20 mA High Current Sink Operation This test verifies current sink operation and readback of the 3A range a Turn off the dc source and connect the current monitoring resistor across the output and the DMM across the resistor as shown in Figure 2 1a Connect an external power supply in place of the electronic load Set the DMM to operate in voltage mode Turn on the dc source and set the current range readback to 3A Turn on the external power supply and program it to 1 5 V and 3A Then program the dc source to OV and the current to the full scale value in Table B 2 The UUT display should read approximately 3A Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amperes and record this value Also record the current reading that appears on the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under Current Sink Readback 3A CC Load and Line Regulation The following CC Load Effect and CC Source Effect tests verify the regulation of the output current To insure that the values read are not the instantaneous measurement of the ac peaks of the output current ripple several dc measurements should be made and the average of these readings calculated An exa
39. es The power on self test sequence tests most of the digital and DAC circuits If the supply fails self test the display ERR annunciator will come on You can then query the unit to find out what the error s are When an error is detected the output is not disabled so you can still attempt to program the supply to help troubleshoot the unit Table 3 2 lists the self test errors and gives the probable cause for each error NOTE A partial self test is performed when the TST query is executed Those tests that interfere with normal interface operation or cause the output to change are not performed by TST The return value of TST will be zero if all tests pass or the error code of the first test that failed The dc source will continue normal operation if TST returns a non zero value Table 3 2 Self Test Error Codes Messages E11 12 bit DAC test failed O is written to DAC U241A and B ADC A2 Interface Bd U242 is checked for 133 7 counts E12 12 bit DAC test failed 4095 is written to DAC U241A and 0 to B A2 Interface Bd ADC U242 is checked for 71 7 counts E13 12 bit DAC test failed 0 is written to DAC U241A and 4095 to B A2 Interface Bd ADC U242 is checked for 71 7 counts E14 12 bit DAC test failed 4095 is written to DAC U241A and B ADC A2 Interface Bd U242 is checked for 10 7 counts E15 8 bit DAC test failed 10 and 240 are written to DAC U244 ADC A2 Interface Bd U242 is checked for 10 and 240 7 counts
40. es not warrant that the operation for the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by Keysight Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Keysight Technologies for warranty service Except for products returned to Customer from another country Keysight Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Keysight Technologies product price only if Customer pays Keysight Technologies international prices defined as destination local currency price or U S or Geneva Export price If Keysight Technologies is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Keysight Technologies LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED KEYSIGHT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WA
41. est indications are described in the Checkout Procedure in Chapter 3 of the User s Guide If the supply passes the self test and there are no obvious faults you should perform the verification procedures in Chapter 2 from the front panel to determine if any functions are not calibrated or are not operating properly Then program and read back a voltage via the GPIB to see if the supply responds properly to bus commands If the supply fails any of the tests you will be directed to the applicable flow chart or troubleshooting procedure Flow Charts Troubleshooting flow charts are given in figure 3 1 sheets 1 4 The flow charts make reference to the test points listed in Chapter 6 The circuit locations of the test points are shown on the component location diagrams in Chapter 6 26 Troubleshooting 3 Turn on unit and observe display All segments and annunciators should light The address appears next After self test the unit should either display an error message or go to the metering mode Check Bias voltages see Table 3 3 AC line OK Check main fuse F301 i gt Bias voltages OK fmr inputs OK2 If OK replace T1 Yes v Replace A1 Check A1F304 Check cable No 45V A2J211 1 W12 power to chassis cable from A1 to A2 board Display on Fan on Go to Error Message 2 Error Message Table 3 2 A2J211 5 low no pulses Replace
42. esult in personal injury BEFORE APPLYING POWER Verify that the product is set to match the available line voltage the correct line fuse is installed and all safety precautions see following warnings are taken In addition note the instrument s external markings described under Safety Symbols GROUND THE INSTRUMENT Before switching on the instrument the protective earth terminal of the instrument must be connected to the protective conductor of the mains power cord The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact This protective action must not be negated by the use of an extension cord power cable that is without a protective conductor grounding Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury FUSES Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified service personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid
43. ical continued Part_Number Description eae THROUGH HOLE UNITS ONLY refer to title page for serial numbers 5002 1510 06611 00003 Side Bracket Left MP3 33120 40200 66111 80001 1 Nameplate 66111A 5080 2594 1 Nameplate 66311A 66311 80002 1 Nameplate 66311B MPio i MP12 0515 0430 Screw M4x0 7x8mm Torx T15 Pan Conical cup MP11 1400 0977 Ground Clip MP13 5041 8801 MP22 06611 00004 Transformer Bracket MP14 06611 00002 MP23 06611 40006 MP15 03478 88304 MP16 1252 1488 Terminal Block 4 Position RI DFI MP17 0360 2604 Terminal Block 5 Position Output Sense E ee 06611 80001 Front Panel Keypad Label 66311A MP32 0370 2862 Pushbutton Ref Sense Switch MP33 06611 40005 Support Plate MP21 0515 0374 Screw M3x0 5x10mm Torx T10 Pan Conical cup MP24 66311 80001 Rear Panel Label MP10 06611 00005 Side Bracket Right MP34 1400 1281 Cable Clip ref 66311A MP35 0590 0305 Hex Nut 6 32 w Lockwasher ref 66311A MP36 1510 0091 Binding Post ref 66311A 52 Replaceable Parts List 5 Figure 5 1 Mechanical Parts Identification 53 Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining the Keysight Model 66111A 66311A B
44. ide Performance Tests NOTE The following paragraphs provide test procedures for verifying the supply s compliance with the specifications listed in Table A 1 of the User s Guide A full Performance Test consists of only those items listed as Specifications in Table A 1 of the User s Guide and that have a procedure in this document All of the performance test specifications are entered in the appropriate Performance Test Record Card for your specific model You can record the actual measured values in the column provided in this card Programming You can program the supply from the front panel keyboard or from an GPIB controller when performing the tests The test procedures are written assuming that you know how to program the supply either remotely from an GPIB controller or locally using the control keys and indicators on the supply s front panel Also when performing the verification tests from an GPIB controller you may have to consider the relatively slow settling times and slew rates of the dc source as compared to computer and system voltmeters Suitable WAIT statements can be inserted into the test program to give the dc source time to respond to the test commands Table 2 2 Programming and Output Values Keysight Model Full scale Vmax Full Scale Imax Isink OV Voltage Current Max 13 2 Verification and Performance Tests Constant Voltage CV Tests CV Setup If more than one meter or if a meter and an osci
45. injuries always disconnect power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present Any adjustment maintenance and repair of this instrument while it is opened and under voltage should be avoided as much as possible When this is unavoidable such adjustment maintenance and repair should be carried out only by a skilled person who is aware of the hazard involved DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to a Keysight Technologies Sales and Service Office for service and repair to ensure that safety features are maintained SAFETY SYMBOLS Refer to the table on the following page WARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met Caution The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do
46. keys select ROMUPD model d Using the Up Down arrows select the appropriate model number e Press Enter The dc source will go through the turn on self test sequence and return to the dc source metering mode It is now re initialized and must be calibrated See Appendix A of the User s Guide for the calibration procedure ROM Upgrade Identifying the Firmware There are two ways to identify the firmware of the unit either from the front panel of the unit or over the GPIB To display the firmware revision from the front panel of the unit a Press the Address key b Using the Up Down annunciator keys scroll to ROM lt A xx xx gt 35 3 Troubleshooting To identify the firmware revision over the GPIB bus use the IDN query The query will read back the revisions of the Primary Interface ROM U205 located on the A2 Interface board The manufacturer and model number of the unit are also returned The following is a sample program 10 ALLOCATE L 42 20 OUTPUT 705 IDN 30 ENTER 705 L 40 DISP L 50 END The computer will display the manufacturer s name the model number a 0 and then the firmware revision Example HEWLETT PACKARD 663124 0 A 00 01 The revision level of the ROM can also be found on the label affixed to the physical IC chip itself Upgrade Procedure CAUTION The dc source has components that can be damaged by ESD electrostatic discharge Failure to observe standard an
47. lloscope are used connect each to the terminals by a separate pair of leads to avoid mutual coupling effects For constant voltage dc tests connect only to S and S since the unit regulates the output voltage that appears between S and S and not between the and output terminals Use coaxial cable or shielded two wire cable to avoid noise pickup on the test leads Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readback and front panel display functions are within specifications Note that values read back over the GPIB should be identical to those displayed on the front panel a Turn off the supply and connect a digital voltmeter DVM directly across the S and S terminals as shown in Figure 2 1a b Turn on the dc source and program the output to zero volts and the maximum programmable current Imax in Table 2 2 with the load off c Record the output voltage readings on the DVM and the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under Voltage Programming and Readback 0 Volts Also note that the CV annunciator is on The output current reading should be approximately zero d Program the output voltage to full scale see Table 2 2 e Record the output voltage readings on the DVM and the front panel display The readings should be within the limits specified in the performance test recor
48. m the signals on the 30 pin connector described in this section Refer to Table 3 4 for the differences The logic array also directly communicates with the A1 main board via a number of level sensitive signal lines which perform the following functions C Mux Ctrl 1 and C Mux Ctrl 2 control the readback multiplexer for output 2 and the DVM Status Ctrl 1 and Status Ctrl 2 control the Status readback multiplexer The PM_Inhibit control signal is used to shut down the bias voltage to the output stages and keep the dc source output off The OV SCR control signal is used to fire the SCR The Status Detect signal informs the array of the present operating mode either CV or CC of both the main output and output 2 The OV Detect signal indicates if an overvoltage condition has occurred on the Main output 44 Principles of Operation 4 The EEPROM electrically erasable programmable read only memory chip on the A2 interface board stores a variety of data and configuration information This information includes calibration constants GPIB address present programming language and model dependent data such as the minimum and maximum values of voltage and current One of the EEPROM storage locations holds a checksum value which is used to verify the integrity of the EEPROM data Access to the calibration data in the EEPROM is controlled by the combination of a password and switch settings on A2S201 located on A2 interface board see chapter 3 Inhibi
49. mple of how to do this is given below using a Keysight 3458A System Voltmeter programmed from the front panel Set up the voltmeter and execute the Average Reading program follows a b C Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER Program 100 samples per trigger by pressing N Rdgs Trig 1 00 ENTER Set up voltmeter to take measurements in the statistical mode as follows Press Shift key f0 Shift key N Press up arrow until MATH function is selected then press gt Press up arrow until STAT function is selected then press ENTER 17 2 Verification and Performance Tests d Set up voltmeter to read the average of the measurements as follows Press Shift key f1 Shift key N Press down arrow until RMATH function is selected then press gt Press up arrow until MEAN function is selected then press ENTER e Execute the program by pressing f0 ENTER TRIG ENTER f Wait for 100 readings and then read the average measurement by pressing f1 ENTER To repeat the measurement perform steps e and f CC Load Effect This test measures the change in output current for a change in load from full scale output voltage to short circuit a Turn off the dc source and connect the output as shown in Figure 2 1a with the DVM connected across the current monitoring resistor b Turnon the dc source and if it was set to low range readback in the previous test set it back to high or auto
50. n Minimum Maximum Specification Specification DVM VOLTAGE CALIBRATION VERIFICATION Positive Voltage Measurement 15mV 15mV Negative Voltage Measurement 6 8mV 6 8mV 23 Troubleshooting Introduction WARNING SHOCK HAZARD Most of the troubleshooting procedures given in this chapter are performed with power applied and protective covers removed Such maintenance should be performed only by service trained personnel who are aware of the hazards for example fire and electrical shock CAUTION This instrument uses components which can either be damaged or suffer serious performance degradation as a result of ESD electrostatic discharge Observe the standard antistatic precautions to avoid damage to the components An ESD summary is given in Chapter 1 This chapter provides troubleshooting and repair information for the dc source Before attempting to troubleshoot the dc source first check that the problem is with the supply itself and not with an associated circuit The verification tests in Chapter 2 enable you to isolate a problem to the dc source Troubleshooting procedures are provided to isolate a problem to one of the circuit boards Figure 3 2 shows the location of the circuit boards and other major components of the unit Disassembly procedures are provided at the end of this chapter and should be referred to as required in order to gain access to and or replace defective components If an assembly is defective
51. nals are in the range of 0 to 5V which corresponds to the zero to full scale readback capability of the dc source The 8 channel 8 bit ADC returns the following signals to the logic array overvoltage programming OV Prog high range output current Imon H voltage and current of output 2 Rdbk 16bit main output voltage V Mon ambient temperature Temp Amb and heatsink temperature HS Therm The logic array varies the Fan Prog signal depending upon the ambient temperature and the main output current A1 Main Board Circuits Power Circuits As shown in figures 6 2 and 6 4 the power circuits consist of input power rectifiers and filter primary and secondary bias circuits an output regulator a downprogrammer circuit current monitoring resistors an overvoltage SCR and an output filter All bias circuits are located on the Al pc board Bias voltage test points are shown in figure 6 1 and transformer wiring diagrams are shown in figure 3 3 The primary bias circuits are referenced to chassis earth ground They provide the bias for the GPIB RS232 and RI DFI interfaces the interface micro processor circuits and the front panel The secondary bias circuits are referenced to secondary output common and are isolated from the chassis ground They provide the bias for the amplifier and output circuits located on the A1 pc board They also provide the bias for the logic array EEPROM DAC and ADC circuits and the secondary side of the Opt
52. not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Safety Symbol Definitions Description Alternating current Both direct and alternating current Three phase alternating current Earth ground terminal Protective earth ground terminal Frame or chassis terminal Terminal is at earth potential Used for measurement and control circuits designed to be operated with one terminal at earth potential Terminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment On supply Off supply Standby supply Units with this symbol are not completely disconnected from ac mains when this switch is off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch In position of a bi stable push control Mc sonos Notice The information contained in this document is subject to change without notice Keysight Technologies makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Keysight Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material This document contains proprietary information which is protected b
53. nterface to indicate that the corresponding loop is in control 47 4 Principles of Operation With the CV loop in control the output voltage is regulated by comparing the programmed voltage signal CV_Prog2 0 to 5V with the output voltage sensed at the B and B Output If the output voltage exceeds the programmed voltage the Control_2 signal goes low causing the output regulator to conduct less and decrease the output voltage Conversely if the output voltage is less than the programmed voltage the Control_2 signal goes high causing the regulator to conduct more and increase the output voltage Depending on where the output sense leads are connected the output voltage is either monitored at the supply s B Output terminals or at the load with the the remote sense leads connected to the load With the CC loop in control the output current is regulated by comparing the programmed current signal CC_Prog2 0 to 5V with the output current monitor B_Imon The B_Imon signal is produced by measuring the voltage drop across current monitoring resistor and is in the 0 to 5V range which corresponds to the zero to full scale output current range If the output current exceeds the programmed value the Control_2 signal goes low causing the output regulator to conduct less and thus decrease the output current Conversely if the output current is less than the programmed value the Control_2 signal goes high causing the output regulator to conduct
54. o isolators on A2 As shown in figure 6 2 the ac input rectifier and filter converts ac input to a dc level The output regulator regulates this dc level at the output of the dc source The output regulator stage consists of two parallel NPN series regulators mounted on a heatsink and connected between the Rail and the Output The conduction of these series regulators is increased or decreased by the Control signal from the CV CC control circuits in order to regulate the output voltage in CV mode or output current in CC mode 45 4 Principles of Operation An NPN downprogramming transistor is connected between the Output and the Rail The conduction of the downprogramming transistor is controlled by the DP_Control signal from the CV CC control circuits Whenever the output voltage is greater than the programmed voltage setting the downprogramming transistor conducts and shunts current away from the load until the output voltage equals the programmed setting The SCR connected across the output will fire and short the output when an overvoltage condition is detected The SCR is controlled by the OV_SCR signal from the crowbar control circuit described in the next section Two current shunt resistors RmHi and RmLo monitor the output current RmHi monitors the high current range RmLo monitors the low current range Shunt clamps are connected in parallel across RmLo to limit the voltage across RmLo to about 1 5 volts This correspond
55. oubleshooting a unit with no output voltage or current If the unit has passed self test the programming DAC circuits on the A2 circuit board are probably working properly If either the CV or CC annunciators is on then the problem is in either the CV or CC control circuits located on the Al Main board If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in the main power transformer or the driver or output regulator stages circuits also on Al but after the gating diodes J307 Voltage Measurements Cable W8 connects J307 of the Al Main Board Assembly to J207 of the A2 Interface Assembly Table 3 4 provides a quick method of determining if the voltages between these assemblies are within the normal range If any of these voltages is outside the normal range refer to the flowcharts to further troubleshoot the circuit associated with the abnormal voltage Note that Keysight 66311B units with through hole boards these are the units that have the external remote sense switch on the rear panel have a 28 pin connector All other units with surface mount boards use the 30 pin connector 32 Troubleshooting 3 Table 3 4 Voltage Measurements at J207 A2 Interface to A1 Main board A1J207 A1J207 Signal Name CV Mode CC Mode 30 pin 28 pin Full Scale Voltage Full Gees UE No Load pe 0 eti 39 28 Burst st 30 pin 2 5V reference 28 pin See CC kog 2 30 pin 2 6 Fuse 28 pin
56. ove 34 Troubleshooting 3 Inhibit Calibration Switch If CAL DENIED appears on the display when calibration is attempted or if error code 401 occurs when calibrating over the GPIB the internal INHIBIT CAL switch has been set This switch setting prevents unauthorized or inadvertent dc source calibration You must reset this switch in order to calibrate the supply This four section switch S201 is located on the A2 Interface board near the GPIB connector The switch has two functions related to calibration One is Inhibit Calibration With this switch set the supply will not respond to calibration commands thus providing security against unauthorized calibration The other switch allows you to bypass the password in case it is forgotten 4321 Pati switens ont Clear Off On Password 201 Inhibit On Off Calibration Initialization The dc source s GPIB address and model number as well as other constants which are required to program and calibrate the supply are stored in a EEPROM on the A2 Interface board The Interface board also contains references and other components that will affect the alignment of the supply If the Interface board is replaced the supply must be reinitialized and calibrated To initialize the dc source a Enable the Calibration mode by pressing Shift then Cal and then Enter b Simultaneously depress the 0 and 1 keys EEINIT model will be displayed c Using the Up Down annunciator
57. page for serial numbers 66311 61021 66311B D Tested PCA printed circuit assembly 66311 61027 66309 61020 66309B D Tested PCA 5064 0129 i 66311 61028 66311B Tested PCA J02 66311 61029 5064 0095 66309D Tested PCA Option 521 5064 0138 5064 0094 66309D Tested PCA Option 501 A2 B 5064 0098 66311B D 66309B D Tested Interface PCA 66309 60001 Complete Front Assembly includes frame keypad PCA etc 1 66311 61021 Tested Printed Circuit Assembly PCA only A5 5064 0045 66311D 66309D Tested DVM PCA 5064 0100 1 66311D 66309D Tested DVM PCA Option 521 064 0087 1 1 5 5064 0092 Relay Board Option 521 66309 61025 a7 5064 00 li Output 2 Downprogrammer PCA Option 501 B1 06632 60002 l Fan Assembly UE 1 Fuse 1 6AT 250V surface mount 230Vac input 2110 0638 Fuse 3 15AT 250V surface mount 115Vac input Fuse 0 125AM 125V Fuse submin 5AM 125V Fuse submin 5AT 125V Fuse surface mount 5AM 125V Fuse surface mount 15AM Fuse submin 4AT 125V Fuse submin 4AM 125V 66309B D output 2 Rotary pulse generator These board assemblies are only used on units with firmware revision A 02 04 and up see chapter 3 Al A2 A3 A6 A7 1 49 5 Replaceable Parts List Table 5 1 Chassis Electrical continued TI 9100 5276 w1 06611 80033 __ Primary Power Cable T1 to ALE312313 O Secondary Power Cable T1 to A1 J305 Secondary Power Cable T1 to A1 J303 W13
58. ransformer white yellow Top part of white violet transformer white yellow T BN white red grey Front of unit Front of unit orange spare f 100 VAC 230 VAC orange Top part of white violet Top part of white violet l transformer white yellow transformer white yellow olla aloo white red grey Front of unit white red grey Front of unit white orange All voltages white red white red red white black Bottom part of white brown transformer black white black white grey Front of unit Figure 3 6 Transformer Wiring 41 Principles of Operation Introduction This section describes the different functional circuits used in the dc source First the I O external signals that connect to the dc source are described Next the overall block diagrams for the dc source are described in detail The simplified block diagrams found in chapter 6 show the major circuits on the dc source as well as the signals between circuits They also show the reference designations of some of the components in the functional circuit I O Interface Signals Table 4 1 describes the interface signals between the dc source and the end user or other e
59. replace it and then conduct the verification test given in Chapter 2 NOTE When either the Al Control Board or the A2 Interface Board is replaced the supply must be calibrated see Post Repair Calibration later in this chapter If the A2 Interface Board is replaced the supply must be initialized before it is calibrated See Initialization later in this chapter Chapter 5 lists all of the board level replaceable parts for the dc source Chapter 6 contains block diagrams test point measurements and component location diagrams to aid you in troubleshooting the supply 25 3 Troubleshooting Test Equipment Required Table 3 1 lists the test equipment required to troubleshoot the dc source Recommended models are listed Table 3 1 Test Equipment Required for Troubleshooting Recommended Model GPIB Controller To communicate with the supply via the HP Series 200 300 GPIB interface Digital Voltmeter To check various voltage levels Keysight 3458A Oscilloscope To check waveforms and signal levels Keysight 54504A 54111A Electronic Load To test operation of current circuit Keysight 6060B 60V or 6063B 240V Shunt Overall Troubleshooting Overall troubleshooting procedures for the dc source are given in the figure 3 1 The procedures first check that neither an AC input nor a bias supply failure is causing the problem and that the supply passes the turn on self test error annunciator stays off The normal turn on self t
60. ront Panel board is an assembly level replaceable part The Keysight 66311A unit has a separate front panel binding post board All circuit boards are available as assembly level replaceable parts The A3 front panel board contains microprocessor circuits which decode and execute all keypad and RPG commands that are transferred to the dc source output via the serial I O port to the primary interface circuits on the A2 interface board The front panel microprocessor circuits also process dc source measurement and status data received on the serial I O port and send them to the display A2 Interface Circuits The circuits on the A2 interface board provide the interface between the GPIB interface RS 232 interface and front panel interface and the dc source Communication between the dc source and an GPIB controller is processed by the GPIB interface and the primary microprocessor circuits on the A2 board The A2 Interface board is assembly level replaceable it contains no user replaceable parts With the exception of the front panel microprocessor all digital circuits analog to digital converters ADC and digital to analog converters DAC in the dc source are located on the A2 Interface board Control signals between the A2 interface board and the A1 main board are either analog or level signals Primary Interface The primary microprocessor circuits DSP ROM and RAM chips decode and execute all instructions and control all data transfers be
61. s of the DVM are internally referenced to the minus terminal of the main output the DVM cannot measure voltages greater than 25 Vdc or less than 4 5 Vdc with respect to the negative terminal of the main output The A5 DVM board is assembly level replaceable it contains no user replaceable parts A6 Option 521 Relay Circuits The A6 Option 521 relay board incorporates solid state relays to connect and disconnect the outputs of the dc source The relays are available on the Out and sense terminals of Output 1 and on the Out and sense terminals of Output 2 When the solid state relays are open the output impedance is effectively raised to about 500k ohms for output 1 and about 200k ohms for output 2 The output relays are controlled by signals generated on the A2 Interface board which are transferred to the relay board via cable W9 Cable W10 is used to daisy chains other signals such as the output on off signals from the A2 Interface board to the A1 board Cable W11 connects the relays to the outputs of the dc source The A6 Option 521 relay board is assembly level replaceable it contains no user replaceable parts 48 Replaceable Parts List Introduction This section lists the replaceable parts for all models Refer to figures 5 1 and 5 2 for the location of mechanical parts with the reference designators MP Table 5 1 Chassis Electrical Part Number Qty Description eae SURFACE MOUNT UNITS ONLY refer to title
62. s to approximately 30 mA 20mA is the maximum rating of the low current range An output filter capacitor provides additional filtering of the dc output Control Circuits As shown in Figure 6 2 the control circuits consist of the CV CC control output voltage current monitor bias supplies and SCR control The CV CC control circuits provide a CV control loop and a CC control loop For any value of load resistance the supply must act either as a constant voltage CV or as a constant current CC supply Transfer between these modes is accomplished automatically by the CV CC control circuit at a value of load resistance equal to the ratio of the programmed voltage value to the programmed current value A low level CV_Detect or CC_Detect signal is returned to the secondary interface to indicate that the corresponding mode is in effect With the CV loop in control the output voltage is regulated by comparing the programmed voltage signal CV_Prog 0 to 5V with the output voltage monitor signal VMon The VMon signal is in the 0 to 5 V range which corresponds to the zero to full scale output voltage range of the supply If the output voltage exceeds the programmed voltage the Control signal goes low causing the output regulator to conduct less and decrease the output voltage Conversely if the output voltage is less than the programmed voltage the Control signal goes high causing the regulator to conduct more and increase the output voltage The
63. solation chips The ac input rectifier and filter converts ac input to a dc level The output regulator regulates this dc level at the output The output regulator stage consists of a P channel FET series regulator connected between the B Rail and the B Output The conduction of the series regulators is increased or decreased by the Control 2 signal from the CV CC control circuits in order to regulate the output voltage in CV mode or output current in CC mode A downprogramming FET is connected between the B Output and the B Output The conduction of this FET is controlled by the Drive signal from the CV CC control circuits When the output is turned off the downprogramming FET conducts and shunts current away from the load A current shunt resistor monitors the output current A gross current limit circuit protects the output if the output current exceeds the maximum current rating of the output An output filter capacitor provides additional filtering of the dc output The CV CC control circuits provide a CV control loop and a CC control loop For any value of load resistance the supply must act either as a constant voltage CV or as a constant current CC supply Transfer between these modes is accomplished automatically by the CV CC control circuit at a value of load resistance equal to the ratio of the programmed voltage value to the programmed current value A low level B CV Detect or B CC Detect signal is returned to the secondary i
64. t Calibration Switch The Dual 12 bit DAC converts the programmed value of voltage and current on the bus into the CV_Prog and CC_Prog signals which are sent to the CV control circuits in order to control the magnitude of the output voltage in the CV mode and output current in CC mode The CV_Prog and CC_Prog signals are in the 0 to 5 V range which corresponds to the zero to full scale output ratings of the dc source The Quad 8 bit DAC converts programmed information for the following circuits into analog format output 2 voltage programming CV Prog 2 output 2 current programming CC Prog 2 overvoltage setting OV Prog and fan speed programming Fan Prog The CV Drog 2 and CC Prog 2 signals control the magnitude of the output 2 voltage in the CV mode and output 2 current in CC mode The OV Prog signal is applied to the OV detect circuit of the main output which compares the programmed overvoltage setting with the actual output voltage The Fan Prog signal is applied to the fan speed control circuit in order to speed up the fan as temperature or output current increases and to slow the fan speed down as temperature or current decreases The 16 bit ADC in conjunction with a 4x1 multiplexer returns data from the following measurement signals to the logic array monitored peak current Imon P monitored high range current Imon H readback signal for output 2 and the DVM Rdbk 16bit and monitored output voltage VMon All measurement sig
65. t units 12 Verification and Performance Tests 2 Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power If a variable resistor is used switches should be used to either connect disconnect or short the load resistor For most tests an electronic load can be used The electronic load is considerably easier to use than load resistors but it may not be fast enough to test transient recovery time and may be too noisy for the noise PARD tests Fixed load resistors may be used in place of a variable load with minor changes to the test procedures Also if computer controlled test setups are used the relatively slow compared to computers and system voltmeters settling times and slew rates of the dc source may have to be taken into account Wait statements can be used in the test program if the test system is faster than the dc source Current Monitoring Resistor To eliminate output current measurement error caused by voltage drops in the leads and connections connect the current monitoring resistor between the OUT and the load as a four terminal device Connect the current monitoring leads inside the load lead connections directly at the monitoring points on the resistor element Operation Verification Tests To assure that the supply is operating properly without testing all specified parameters perform the turn on and checkout procedures given in the User s Gu
66. tage 14 Verification and Performance Tests 2 c Turn on the dc source and program the current to the maximum programmable value Imax and the output voltage to the full scale value in Table 2 2 d Adjust the load for the full scale current value in Table 2 2 as indicated on the front panel display The CV annunciator on the front panel must be on If it is not adjust the load so that the output current drops slightly e Adjust the transformer to the lowest rated line voltage refer Table A 2 in Appendix A of the User s Guide under Mains Input Ratings f Record the output voltage reading on the DVM g Adjust the transformer to the highest rated line voltage refer Table A 2 in Appendix A of the User s Guide under Mains Input Ratings h Record the output voltage reading on the DVM The difference between the DVM reading in steps f and h is the source effect voltage and should not exceed the value listed in the performance test record card for the appropriate model under CV Source Effect CV Noise PARD Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac voltage superimposed on the dc output voltage CV PARD is specified as the rms or peak to peak output voltage in the frequency range specified in Appendix A of the User s Guide a Turn off the dc source and connect the output as shown in Figure 2 1a to an oscilloscope ac coupled between the and the
67. tage condition occurs the SCR control circuit generates the OV signal which causes the following actions to occur 1 The SCR fires shorting the supply s output 2 The microprocessor circuits are notified of the OV condition OV_Detect is low in order to program the ouput off turn off the gated 15V bias supplies and update the status of the unit 3 The PM_Inhibit signal goes high programming the output off and shutting down the gated 15V bias for the output regulators 4 When a output protection clear command is executed the microprocessor circuits resets the OV circuits turns on the gated 15V biases and programs the output to its previous level The fan driver control circuit provides the DC voltage to operate the cooling fan The Fan_Prog signal from the secondary interface circuit varies this voltage according to the ambient and heatsink temperature as well as the output voltage and current of the supply Output 2 As shown in Figure 6 5 the output 2 circuits consist of input power rectifiers and filter an output regulator a downprogrammer circuit current monitoring resistor an output filter the CV CC control output voltage current monitor and an inhibit circuit Ouptut 2 data is transferrred between the output 2 circuits and the primary interface via the CV Prog2 CC Prog2 Status Detect and the Rdbk 16bit signals NOTE Isolation between the main output and output 2 is provided by isolation amplifiers and optical i
68. the current monitoring resistor across the dc source output and the DVM across the resistor as shown in Figure 2 1a See Current Monitoring Resistor for connection information Turn on the dc source and program the output voltage to 5 V and the current to 0 A The dc source s current detector must be set to DC Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value Iout Also record the current reading on the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under Current Programming and Readback 0A Program the output current to the full scale value in Table 2 2 Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value Iout Also record the current reading that appears on the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under Current Programming and Readback Full Scale Low Current Range Readback Accuracy This test verifies the readback accuracy of the 20 milliampere current range a 16 Turn off the dc source and connect the output as shown in Figure 2 1b using the 400 ohm load resistor Set the DMM to operate in current mode Turn on the dc source and set the current range readback to Low 0 0
69. tion This document contains test procedures to verify that the dc source is operating normally and is within published specifications There are three types of tests as follows Built in Self Tests These tests run automatically when the dc source is turned on check most of the digital circuits and the programming and readback DACs Operation Verification These tests verify that the dc source is probably operating normally but do not check all of the specified operating parameters Performance Tests These tests check that the supply meets all of the operating specifications as listed in the User s Guide NOTE The dc source must pass the built in self tests before calibration or any of the verification or performance tests can be performed If the supply fails any of the tests or if abnormal test results are obtained refer to the troubleshooting procedures in chapter 3 The troubleshooting procedures will determine if repair and or calibration is required Test Equipment Required Table 2 1 lists the equipment required to perform the verification and performance tests A test record sheet with specification limits and measurement uncertainties when test using the recommended test equipment may be found at the back of this section Table 2 1 Test Equipment Required for Verification and Performance Tests Recommended Model Digital Voltmeter Resolution 10 nV 1V Readout 8 1 2 digits Keysight 3458A or Accuracy 20 ppm equivalent 15
70. tistatic practices can result in serious degradation of performance even when an actual failure does not occur When working on the dc source observe all standard antistatic work practices see chapter 1 a Under the Disassembly Procedures in the section titled A2 Interface Board Removal and Replacement perform steps a through f b The board is now in a good position to replace the ROM Use a chip removal tool PLCC SMT Removal Tool p n 5041 2553 or equivalent c Carefully pull the U205 chip out of its socket using the access slots located in the two diagonal corners of the chip socket d To insert the new chip place it over the chip socket Face the bevel or the dot on the chip toward the back of the board away from the GPIB connector Push the chip down into the socket e After the Interface board ROM is upgraded you can re initialize the supply without affecting the calibration See Initialization J206 U205 A 0x 0x didH J211 J210 Jg 7 v LOZS XILINX Les 8 A ZEZSH U245 coer O Figure 3 2 Firmware component Locations 36 Troubleshooting 3 Disassembly Procedures The following paragraphs provide instructions on how to disassemble
71. tween the controller and the secondary interface The primary microprocessor circuits also processes measurement and status data received from the secondary interface A Dual Asynchronous Control chip on the A2 board converts the RS 232 RI DFI and front panel data into the primary microprocessor s 8 bit data format The serial data is transferred between the primary interface and the secondary interface via a serial bus and optical isolator chips These chips isolate the primary interface circuits referenced to earth ground from the secondary interface circuits referenced to the supply s output common Secondary Interface The secondary interface circuits include a programmed logic array EEPROM boot ROM 8 and 12 bit DAC circuits and 8 and 16 bit ADC circuits The programmed logic array translates the serial data received from the primary interface into a corresponding digital signal for the appropriate DAC ADC circuits The logic array is also connected directly to four DAC ADC circuits Under control of the logic array the selected DAC converts the data on the bus into an analog signal Conversely the selected ADC converts the analog signals from the A1 board into a digital signal Communication between the A1 and A2 boards is accomplished via a 30 pin connector NOTE Keysight 66111A 66311A and earlier 66311B units with through hole boards have a 28 pin connector between the A1 and A2 boards Some signals on the 28 pin connector differ fro
72. upply s rated current Supply should be in CC Output out of spec Calibrate unit but close Output OK bui Calibrate SE If still meter wrong Wong or wI not calibrate replace A2 CC Prog OK Will not go into CC see Table 3 4 Replace A1 orerror gt 10 No No v Turn on OCP and insure Protect trips Replace A2 Prot trips CC detect low Check cable W12 If Re see Table 3 4 OK replace A1 Yes v Replace A2 Goto Sheet 4 Figure 3 1 Sheet 3 Troubleshooting Flowchart 29 3 Troubleshooting 30 C From Sheet 3 i a Connect controller to the HPIB port and send commands to set the output voltage and current and readback the output Accepts and reads Yes v Run the Performance Test in Chapter 2 Passes test Yes v Short RI terminals on rear of supply and insure output disables and Prot annunciator comeson Remote Inhibit OK Yes v Replace A2 Regulation Transient Response and ripple problems are generally caused by A1 There is either no faul with the power supply or the problem is not covered by this procedure Replace A2 Figure 3 1 Sheet 4 Troubleshooting Flowchart Troubleshooting 3 Specific Troubleshooting Procedures Power on Self test Failur
73. various components of the dc source Once disassembled the components can be reassembled by performing the disassembly instructions in reverse order Figure 3 3 shows the location of the major components of the unit Note that not all boards are included with every model Figure 3 4 shows the location of the cables that interconnect all of the boards This figure shows only the boards not the chassis of the unit WARNING SHOCK HAZARD To avoid the possibility of personal injury turn off ac power and disconnect the line cord before removing the top cover Disconnect the GPIB cable and any loads and remote sense leads before attempting disassembly CAUTION Most of the attaching hardware is metric Use of other types of fasteners will damage threaded inserts Refer to the list of required tools when performing disassembly and replacement DVM board Interface board Option 521 relay board Transformer T1 ee Main board Front panel display board Figure 3 3 Component Location List of Required Tools a 2PT Pozidriv screwdrivers b T10 and T15 Torx screwdrivers c Hex drivers 7 mm for GPIB connector 3 16 for RS 232 connector 8 mm for toggle switch located on the back of Keysight 66311A and earlier 66311B units d Long nose pliers e Antistatic wrist discharge strap 37 3 Troubleshooting
74. xternal circuits and devices Table 4 1 Dc source Interface signals Rear panel Output 1 screw terminals Rear panel Output 2 screw terminals Keysight 66309B D only Rear panel DVM screw terminals Keysight 66311D 66309D only INH FLT connector units are shipped set to INH FLT RS 232 connector OUT OUT sense sense common OUT 2 OUT 2 sense 2 sense 2 common common XON XOFF RTS CTS DTR DSR NONE Positive dc output voltage Negative dc voltage or return 1 OUT sensing terminal OUT sensing terminal connected to ground conductor Positive dc output 2 voltage Negative dc voltage 2 or return 1 OUT sensing terminal OUT sensing terminal connected to ground conductor Positive dc input Negative dc input connected to ground conductor FLT INH mode Digital I O mode FLT output OUT 0 FLT Common OUT 1 INH Input IN 2 OUT 2 INH Common Common uses ASCII control codes DC and DC1 uses Request To Send and Clear To Send lines uses Data Terminal Ready and Data Set Ready lines there is no flow control GPIB connector GPIB IEEE 488 Interface to an external GPIB controller Can be 100Vac 120Vac 220Vac or 240Vac Input 43 4 Principles of Operation A3 Front Panel Circuits As shown in Figure 6 3 the supply s front panel assembly contains a circuit board a keypad a display and a rotary control RPG for the output voltage and current With the exception of the RPG A3G1 the A3 F
75. y copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior written consent of Keysight Technologies Copyright 1999 2001 2005 2014 Keysight Technologies Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual In some cases the manual change applies only to specific instruments Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments Edition 1 5 Reate RR RETE BRI ERREUR December 1999 Update BE January 2001 Update T aeo eee dle EES February 2005 Seele EE December 2014 Instrument Identification The dc source is identified by a unique two part serial number such as US39450101 The items in this serial number are explained as follows US39450101 The first two letters indicate the country of manufacture US United States MY Malaysia The next four digits are the year and week of manufacture or last significant design change Add 1960 to the first two digits to determine the year For example 39 1999 The

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