Agilent Technologies 6632B Service Manual Download Page 1

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Service Manual

Agilent Model 66332A

Dynamic Measurement DC Source

and Agilent Model 6632B, 6633B, 6634B

System DC Power Supply

Agilent Part No. 5962-8119

Printed in Malaysia

Microfiche No 6962-8120 October, 2003

Summary of Contents for 6632B

Page 1: ...ce Manual Agilent Model 66332A Dynamic Measurement DC Source and Agilent Model 6632B 6633B 6634B System DC Power Supply s1 Agilent Part No 5962 8119 Printed in Malaysia Microfiche No 6962 8120 October...

Page 2: ...ucts returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Techn...

Page 3: ...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...

Page 4: ...rminal 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 comple...

Page 5: ...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...

Page 6: ...Resistor 13 Operation Verification Tests 13 Performance Tests 13 Programming 13 Constant Voltage CV Tests 14 CV Setup 14 Voltage Programming and Readback Accuracy 14 CV Load Effect 14 CV Source Effec...

Page 7: ...ver Removal and Replacement 44 A2 Interface Board Removal and Replacement 44 Front Panel Assembly Removal and Replacement 44 A3 Front Panel Board Removal and Replacement 45 A1 Main Control Board 45 T1...

Page 8: ......

Page 9: ...s exist within the dc power supply chassis This dc power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a...

Page 10: ...pgrade Electrostatic Discharge CAUTION The dc power supply has components that can be damaged by ESD electrostatic discharge Failure to observe standard antistatic practices can result in serious degr...

Page 11: ...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 requi...

Page 12: ...ity 100 V Agilent 3400B or equivalent Variable Voltage Transformer Adjustable to highest rated input voltage range Power 500 VA Measurement Techniques Test Setup Most tests are performed at the rear t...

Page 13: ...points on the resistor element Operation Verification Tests To assure that the supply is operating properly without testing all specified parameters perform the following test procedures a Perform th...

Page 14: ...m the supply to zero volts and the maximum programmable current with the load off c Record the output voltage readings on the digital voltmeter DVM and the front panel display The readings should be w...

Page 15: ...r to the highest rated line voltage e g 127 Vac for 115 Vac nominal line voltage input h Record the output voltage reading on the DVM The difference between the DVM reading is steps f and h is the sou...

Page 16: ...on the positive and negative slope Constant Current CC Tests CC Setup Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given in the followin...

Page 17: ...cale output current The current on the UUT display should be approximately 0 mA c Record the current reading on the DMM and the reading on the front panel display The difference between the two readin...

Page 18: ...erage 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 effe...

Page 19: ...he output current should be at the full scale rating with the CC annunciator on e Divide the reading on the rms voltmeter by the monitor resistor to obtain rms current It should not exceed the values...

Page 20: ...mV 0 3 mV Transient Response Voltage in 100 s Vout 20 mV __________ Vout 20 mV Constant Current Tests Current Programming and Readback High Range CC Programming Accuracy 0A Current Readback Accuracy...

Page 21: ...sponse Voltage in 100 s Vout 50 mV __________ Vout 50 mV Constant Current Tests Current Programming and Readback High Range CC Programming Accuracy 0A Current Readback Accuracy 20mA High Range CC Prog...

Page 22: ...e Voltage in 100 s Vout 100 mV __________ Vout 100 mV Constant Current Tests Current Programming and Readback High Range CC Programming Accuracy 0A Current Readback Accuracy 20mA High Range CC Program...

Page 23: ...upply Troubleshooting procedures are provided to isolate a problem to one of the circuit boards or a particular circuit Figure 3 2 shows the location of the circuit boards and other major components o...

Page 24: ...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 test indications are describe...

Page 25: ...5V A3J2 8 Troubleshoot A1 5V Interface Bias circuit W6 or W7 No Yes RI Replace A3 Front Panel Display board Error Message See Error Message Table 3 2 Yes Yes No OV No OC No Go to Troubleshooting OV a...

Page 26: ...ut to put unit into CC and measure output current with extrenal amp meter Yes Current close to programmed value Calibrate Current No Yes Current prog and unit not in CC Go to Troubleshooting No Curren...

Page 27: ...Troubleshooting 3 27 Figure 3 1 Sheet 3 Main Flowchart continued...

Page 28: ...ng Does the supply overshoot Yes Disable the OV circuit as described in paragragh Disabling Protection Features No Output zero volts 4V A1R350 2 A2 or W7 Defective No Yes No 3V U306B 7 Yes Check C336...

Page 29: ...1CR342 Q318A B D and associated components Yes Note OV_SCR is normally a pulse that goes low for 5us to trip the OV SCR CR342 Connect a DC coupled scope across the output and press Protect Clear sever...

Page 30: ...l the display reads No Protect Off press the Up Arrow to display No Protect On then press enter FS Prot off and Output OK Calibrate unit Yes No FUSE signal OK Check FUSE signal U305B 7 approx 2 8V wit...

Page 31: ...prog value Yes Check for short across output such as output cap C382 CR342 etc Yes CC_Prog R360 4 7V No Check W7 A2 Interface Board No IMon_H U309A 6 0V Yes Check Positive Current Control Circuit U310...

Page 32: ...and Q302 No Q307 collector to emitter 4V Check Q302 Q307 R324 and R326 No Q303 base 1 2V meas from Out Check Rail and Output Stage Yes Yes 1V across R323 Check Q301 Q305 circuits No No Yes Check C331...

Page 33: ...tinued from sheet 7 CV_Prog R401 4 7V Check W7 A2 Interface Board No VMon U315B 7 0V Yes Check Voltage Monitor Amplifier U315B circuit No Check Voltage Control Circuit U315A Yes Figure 3 1 Sheet 9 No...

Page 34: ...t 2 CC_Prog R360 4 8V Check A2 Interface Board No Imon_H U309A 6 3 5V Drop across R473 0 25V No Check High Range Current Monitor Amplifier Yes Check Positive Current Control Circuit Yes Yes Check R473...

Page 35: ...C336 and U306 No U306B 2 OV_DETECT Low Yes Check U306B No OV_SCR pulse R438 low 5us Yes Check Q318B R441 A2 Interface Board No Q318D Collector pulses high 5us Check Q318A B and D and associated circu...

Page 36: ...rip the OV Is the CV annunciator on Vmon U315B 7 OK No Check Voltage Monitor Amplifier U315B circuit No CV_Prog R401 0V Yes A2 Interface Board No Check Voltage Control U315A circuit Yes Voltage 0 6V M...

Page 37: ...ROM A2 Interface Bd E4 Checksum in State Non volatile ROM A2 Interface Bd E5 Checksum in RST Non volatile ROM A2 Interface Bd E10 RAM test failed A2 Interface Bd E11 12 bit DAC test failed 0 is writte...

Page 38: ...e front panel CV annunciator indicates when the CV mode is active CV_DETECT is low The front panel CC annunciator indicates when the CC mode is active CC_DETECT is low The UNREGULATED UNR annunciator...

Page 39: ...to A1 Main board A1J307 Pin Signal Name CV Mode Full Scale Voltage No Load CC Mode Full Scale Voltage Full Load 1 PM_INHIBIT Enabled 0 0 2 OV_SCR 5 5 3 OV_PROG 3 9 3 9 4 FAN_PROG 2 8 3 8 5 OV_DETECT...

Page 40: ...s select FAN MODE MAN d Press Enter e Simultaneously depress the 0 and 9 keys EEINIT model will be displayed f Using the Up Down annunciator keys select FAN SPEED data g Press Enter Number h Enter the...

Page 41: ...rder to calibrate the supply This four section switch S201 is located on the A2 Interface board near the GPIB connector The switch has 2 functions related to calibration One is Inhibit Calibration Wit...

Page 42: ...ry to identify the revision of the supply s firmware The query will readback the revisions of the Primary Interface ROM located on the A2 Interface board The manufacturer and model number of the suppl...

Page 43: ...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 o...

Page 44: ...the snap in standoffs f To reinstall the Interface board perform the above steps in reverse order Front Panel Assembly Removal and Replacement This procedure removes the front panel assembly from the...

Page 45: ...ce board as previously described b 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 mista...

Page 46: ...rmer terminals NOTE Install the correct fuse when changing the ac line voltage from a previous setting for 110 120 Vac 4 AM Agilent p n 2110 0055 for 220 230 Vac 2 AM Agilent p n 2110 0002 grey white...

Page 47: ...d user or other external circuits and devices Table 4 1 Power Supply Interface signals Connector Signal Description Front panel outputs OUT OUT Positive DC output voltage Negative DC voltage or return...

Page 48: ...microprocessor circuits DSP ROM and RAM chips decode and execute all instructions and control all data transfers between the controller and the secondary interface The primary microprocessor circuits...

Page 49: ...Principles of Operation 4 49 Figure 4 1 A2 A3 Block Diagram...

Page 50: ...to the logic array monitored output voltage VMon monitored high range current Imon_H monitored low range current Imon_L and monitored peak current Imon_P All measurement signals are in the range of 0...

Page 51: ...Principles of Operation 4 51 Figure 4 2 A1 Block Diagram...

Page 52: ...utput voltage Conversely if the output voltage is less than the programmed voltage Vmon goes low and produces a more positive going CV signal which increases the input to the voltage gain stage and ra...

Page 53: ...t 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...

Page 54: ......

Page 55: ...RFI PCA A6 All 5063 3434 1 Relay PCA Tested B1 All 06632 60002 1 Fan Assembly T1 66332A 6632B 9100 5501 1 Main Transformer T1 6633B 9100 5567 1 Main Transformer T1 6634B 9100 5568 1 Main Transformer...

Page 56: ...001 4 Insulator MP19 All 06612 80004 1 Rear Label MP20 All 5041 8801 4 Foot MP21 All 0515 1117 2 Screw M5x0 8x10mm Pozi Flat Patch Lock MP22 All 0515 1132 2 Screw M5x0 8x10mm Pozi Pan Patch Lock MP23...

Page 57: ...Replaceable Parts 5 57 Figure 5 1 Mechanical Parts ldentification...

Page 58: ...32B 0160 5422 2 Cap 0 047 uF 20 C317 All 0160 5422 1 Cap 0 047 uF 20 C318 319 All 0180 4129 2 Cap 1 uF 35V C320 All 0180 4136 1 Cap 10 uF 20V C321 All 0180 4129 1 Cap 1 uF 35V C322 All 0160 5422 1 Cap...

Page 59: ...p 120 pF 5 C363 All 0160 4807 1 Cap 33 pF 5 100V C364 All 0160 5422 1 Cap 0 047 uF 20 C365 All 0160 5471 1 Cap 0 1 uF 5 50V C366 367 All 0160 4791 2 Cap 10 pF 5 100V C368 All 0160 4789 1 Cap 15 pF 5 1...

Page 60: ...All 0160 4801 1 Cap 100 pF 5 C499 66332A 6632B 0160 7562 1 Cap 6 8 uF 63 V CR342 66332A 6632B 5060 3234 1 SCR Rectifier Assembly CR342 D330 1205 0571 1 ref CR342 Heat Sink 1884 0310 1 ref CR342 SCR M...

Page 61: ...5 D336 337 All 1901 0880 2 Diode D400 6634B 1901 0719 1 Diode Power D470 471 All 1902 0960 2 Zener Diode 12V 5 D499 66332A 6632B 6633B 1901 0987 1 Power Diode See Q314 F300 301 All 2110 0712 2 Fuse Su...

Page 62: ...sistor Heat Sink 1853 0652 1 ref Q304 Transistor PNP Q304 1205 0571 1 ref Q304 Heat Sink Q304 6634B 5063 3451 1 Transistor HS Assembly 1853 0652 1 ref Q304 Transistor PNP Q304 1205 0571 1 ref Q304 Hea...

Page 63: ...All 0757 0442 3 Res 10K 1 0 125W R310 All 0698 3156 1 Res 14 7K 1 R311 All 0686 2225 1 Res 2 2K 5 0 5W R312 All 0698 0092 1 Res 2 61K 1 R313 66332A 6632B 0683 0475 1 Res 4 7 Ohm 5 0 25W R313 6633B 66...

Page 64: ...0 125W R339 6633B 0757 0458 1 Res 51 1k 1 0 125W R339 6634B 0698 3454 1 Res 215K 1 0 125W R340 66332A 6632B 0757 0407 1 Res 200 Ohm 1 0 125W R340 6633B 0757 0414 1 Res 432 1 0 125W R340 6634B 0757 028...

Page 65: ...9 1510 1 Res 22 22K 0 05 R365 366 All 0698 6392 2 Res 22K 0 1 0 125W R367 All 0757 0436 1 Res 4 32K 1 R370 All 0757 0442 1 Res 10K 1 0 125W R371 66332A 6632B 0699 0934 1 Res 35 65K 0 1 R371 6633B 6634...

Page 66: ...W R402 All 0757 0438 1 Res 5 11K 1 R403 All 0699 4484 1 Res 72 Ohm R404 66332A 6632B 0757 0442 1 Res 10K 1 0 125W R405 All 0698 8827 1 Res 1M 1 0 125W R406 All 0698 3456 1 Res 287K 1 R407 66332A 6632B...

Page 67: ...l 8159 0005 1 Jumper R439 66332A 6632B 0698 6317 1 Res 500 Ohm 0 1 R440 66332A 6632B 0811 1672 1 Res 3 3 Ohm 5 2W R440 6633B 6634B 0811 2553 1 Res 7 5 5 2W PW R441 All 0698 4486 1 Res 24 9K 1 R442 663...

Page 68: ...Ohm 5 2W R470 6633B 6634B 0811 2553 1 Res 7 5 Ohm 5 2W PW R471 66332A 6632B 0699 1797 1 Res 10M 5 0 25W R471 6633B 6634B 0683 1065 1 Res 10M R472 All 0757 0442 1 Res 10K 1 0 125W R473 66332A 6632B 081...

Page 69: ...Circuit U303 All 1826 1533 1 Integrated Circuit U304 All 5060 3232 1 15V Regulator Assembly All 1826 0106 1 ref U304 Integrated Circuit All 1205 0282 1 ref U304 Heat Sink U305 All 1826 0346 1 Integra...

Page 70: ...scription A5 All 5063 3433 1 AC Input RFI PCA C500 All 0160 4259 1 Cap 0 22 uF 10 C501 502 All 0160 8181 2 Cap 0 0022 uF F500 All 2110 0055 1 Fuse 4AM 250V 100Vac and 120Vac input F500 All 2110 0002 1...

Page 71: ...kages pin 10 pin 20 Table 6 1 Model dependent Components Designator 66332A 6632B 6633B 6634B Designator 66332A 6632B 6633B 6634B C300 304 307 0 047 uF C411 2 2 uF 2 2 uF C302 18000 uF 2200 uF 1200 uF...

Page 72: ...5 R349 26 1K 80 6K 130K R446 2 5K 5 2K 16 1K R350 3 16K 3 92K 3 16K R447 499 Ohm R351 5K 6 2K 5K R449 0 Ohm R352 0 Ohm R450 1 Ohm R354 16 2K 51 1K 80 6K R452 1K 2 15K 5 11K R356 200K 249K 200K R453 10...

Page 73: ...25 R331 1 6 3 1 R397 8 275 8 55 C337 0 1 5 525 C480 3 75 6 2 F500 4 871 3 147 R332 2 25 3 0 R398 4 95 8 875 C338 0 7 7 35 C481 3 75 6 3 J303 0 15 2 75 R333 2 25 3 3 R399 0 875 8 225 C339 1 15 7 45 C48...

Page 74: ...02 U302 3 85 2 15 R458 2 2 9 825 U303 6 275 2 3 R459 2 1 9 825 U304 2 775 1 725 R460 0 6 2 55 U305 1 05 2 4 R461 4 675 7 375 U306 0 575 7 05 R462 4 675 7 275 U308 4 6 5 675 R463 8 275 9 425 U309 2 37...

Page 75: ...Figure 6 1 A1 Board Component Locations...

Page 76: ...Figure 6 2 A4 and A6 Board Component Locations...

Page 77: ...Figure 6 3 A1 Board schematic sheet 1...

Page 78: ...Figure 6 3 A1 Board schematic sheet 2...

Page 79: ...Figure 6 3 A1 Board schematic sheet 3...

Page 80: ...Figure 6 4 A6 Relay Option Board schematic...

Page 81: ...ests 14 Control 50 52 copyrights 5 cover removal 44 current monitoring resistor 13 current sink 17 CV 38 CV load effect 14 CV loop 52 CV Noise 15 CV source effect 15 CV CC control 50 52 CV_Detect 48 5...

Page 82: ...52 ROM upgrade 42 RPG 48 RS 232 47 S safety considerations 9 safety summary 3 schematic A1 77 78 79 A4 76 schematic notes 71 SCR 52 secondary interface 48 self test 37 sense 47 sense switch 52 serial...

Page 83: ...numbers and manual revisions has been updated on pages 5 and 10 Information has been corrected on page 16 and pages 20 22 to comply with ISO 17025 8 15 03 Information has been corrected on page 16 an...

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