Agilent Technologies 6611C Service Manual Download Page 1

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Service Manual

For Agilent Model

6611C, 6612C, 6613C, 6614C

System DC Power Supply

Agilent Part No. 5962-8200

Printed in Malaysia

Microfiche No 5962-8201 October, 2003

Summary of Contents for 6611C

Page 1: ...Service Manual For Agilent Model 6611C 6612C 6613C 6614C System DC Power Supply s1 Agilent Part No 5962 8200 Printed in Malaysia Microfiche No 5962 8201 October 2003 ...

Page 2: ...ducts 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 Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent Technologies is unable withi...

Page 3: ...e 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 t...

Page 4: ...erminal 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 ...

Page 5: ...dentified 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 certai...

Page 6: ...peration Verification Tests 14 Performance Tests 14 Programming 14 Constant Voltage CV Tests 15 CV Setup 15 Voltage Programming and Readback Accuracy 15 CV Load Effect 15 CV Source Effect 16 CV Noise PARD 16 Transient Recovery Time 16 Constant Current CC Tests 17 CC Setup 17 Current Programming and Readback Accuracy 17 Current Sink CC Operation 18 CC Load and Line Regulation 18 CC Load Effect 19 C...

Page 7: ... 39 Cover Removal and Replacement 40 A2 Interface Board Removal and Replacement 40 Front Panel Assembly Removal and Replacement 40 A3 Front Panel Board Removal and Replacement 41 A1 Main Control Board 41 T1 Power Transformer Removal and Replacement 41 Line Voltage Wiring 42 PRINCIPLES OF OPERATION 43 Introduction 43 I O Interface Signals 43 A3 Front Panel Circuits 44 A2 Interface Circuits 44 Prima...

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Page 9: ... 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 power supply and review this manual for safety warnings and instructions Saf...

Page 10: ...Upgrade 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 degradation of performance even when an actual failure does not occur When working on the dc power supply observe all standard antistatic work practices These include but are not limited to Working at a ...

Page 11: ...fications as listed in the User s Guide NOTE The dc power supply 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...

Page 12: ...c load if load is too noisy for CC PARD test 400 ohm 5W 1 ohm 100 W or 2 ohm adjustable 0 6 ohm 100W 6611C 9 ohm 100W 6612C 49 ohm 100W 6613C 99 ohm 100W 6614C or an appropriate 150W Rheostat Agilent p n 0811 1857 Ohmite D12K2R0 2 ohm adjustable Oscilloscope Sensitivity 1 mV Bandwidth Limit 20 MHz Probe 1 1 with RF tip Agilent 54504A or equivalent RMS Voltmeter True RMS Bandwidth 20 MHz Sensitivit...

Page 13: ...est 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 power supply may have to be taken into account Wait statements can be used in the test program if the test system is faster than the supply Load S S Local Remote SENSE 50VDC MAX TO resistor DC Ammeter Load S S Local Remote SENSE 50VDC ...

Page 14: ... procedures for verifying the supply s compliance with the specifications listed in Table A 1 of the User s Guide 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 a GP...

Page 15: ...priate 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 record card for the appropriate mode...

Page 16: ...t 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 the Use...

Page 17: ...n less than 100uS t Check both loading and unloading transients by triggering on the positive and negative slope 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 the specific instructions given in the following paragraphs Current Programmi...

Page 18: ...istance to obtain the current sink value in amps and subtract this from the current reading on the display The difference between the readings should be within the limits specified in the performance test record card under Current Sink Readback Low Range Current Readback Accuracy This test verifies the readback accuracy of the 20 milliampere current range a Turn off the supply and connect the outp...

Page 19: ...hen 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 supply and connect the output as shown in Figure 2 1...

Page 20: ...hould not exceed the values listed in the performance test record card under CC Source Effect 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 supply in CC operation a Turn off th...

Page 21: ..._ 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 _________________ _...

Page 22: ...ak RMS N A N A __________ __________ 3 mV 0 5 mV Transient Response Voltage in 100 µs 20 mV __________ 20 mV Constant Current Tests Current Programming and Readback Low current 0A Iout Readback Accuracy 20mA Iout High Current Full Scale Iout Readback Accuracy Iout 3 32 mA Iout 0 54 mA 4 9955 A Iout 10 5mA __________ __________ __________ __________ 3 32 mA Iout 0 54 mA 5 0045 A Iout 10 5mA Current...

Page 23: ...______ __________ 3 mV 0 5 mV Transient Response Voltage in 100 µs 20 mV __________ 20 mV Constant Current Tests Current Programming and Readback Low current 0A Iout Readback Accuracy 20mA Iout High Current Full Scale Iout Readback Accuracy Iout 1 53 mA Iout 0 29 mA 1 998 A Iout 4 25 mA __________ __________ __________ __________ 1 53 mA Iout 0 29 mA 2 002 A Iout 4 25 mA Current Sink Readback Iout...

Page 24: ..._________ __________ 4 mV 0 5 mV Transient Response Voltage in 100 µs 50 mV __________ 50 mV Constant Current Tests Current Programming and Readback Low current 0A Iout Readback Accuracy 20mA Iout High Current Full Scale Iout Readback Accuracy Iout 1 01 mA Iout 0 24 mA 0 99875 A Iout 2 2 mA __________ __________ __________ __________ 1 01mA Iout 0 24 mA 1 00125 A Iout 2 2 mA Current Sink Readback ...

Page 25: ...5 mV 0 6 mV Transient Response Voltage in 100 µs 100mV __________ 100mV Constant Current Tests Current Programming and Readback Low current 0A Iout Readback Accuracy 20mA Iout High Current Full Scale Iout Readback Accuracy Iout 0 63 mA Iout 0 14 mA 0 49925 A Iout 1 1 mA __________ __________ __________ __________ 0 63 mA Iout 0 14 mA 0 50075 A Iout 1 1 mA Current Sink Readback Iout 1 3 mA ________...

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Page 27: ...tion tests in Chapter 2 enable you to isolate a problem to the dc power supply 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 repla...

Page 28: ... 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 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 fro...

Page 29: ...le A1 A2 cable A2 A3 track on A2 J206 J211 Error Message Yes Go to Error Message Table 3 2 Yes Protect annunciator on No RI Yes OV No Check for OV setting Voltage setting Replace A1 Yes OC No Check that OCP is not enabled Replace A1 Yes FS No Check F309 fuse near main heat sink Replace A1 Yes For OT check fan Replace A1 No Go to Sheet 2 No No A3J111 5 low no pulses Yes No Replace A2 Yes Check Bias...

Page 30: ...ing If not then replace A1 Output out of spec but close Yes No Check cable W9 Replace A1 No Calibrate voltage CV_Prog CC_Prog OK see Table 3 4 Yes Yes Replace A2 No Yes Program the OV 2 volts lower than the output voltage Output OK but meter wrong No Calibrate voltage If still wrong or will not calibrate replace A2 Yes No Unit OV s OV_Prog OK see Table 3 4 Calibrate OV If OV is still not functioni...

Page 31: ...in CC Will not go into CC or error 10 Output out of spec but close Goto Sheet 4 Replace A2 Calibrate unit CC_Prog OK see Table 3 4 Yes Replace A1 Yes No No Yes Output OK but meter wrong Calibrate current If still wrong or will not calibrate replace A2 Yes No Turn on OCP and insure Protect trips No Prot trips CC_detect low see Table 3 4 No Check cable W9 replace A1 Replace A2 No Yes Yes ...

Page 32: ...ccepts and reads back Replace A2 No Run the Performance Test in Chapter 2 Yes Passes test Regulation Transient Response and ripple problems are generally caused by A1 No There is either no fault with the power supply or the problem is not covered by this procedure Remote Inhibit OK Short RI terminals on rear of supply and insure output disables and Prot annunciator comes on Yes Replace A2 No Yes ...

Page 33: ... A2 Interface Bd E2 Checksum in Config Non volatile ROM A2 Interface Bd E3 Checksum in Cal Non volatile 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 written to DAC U241A and B ADC U242 is checked for 133 7 counts A2 Interface Bd E12 12 bit DAC test fa...

Page 34: ...fore 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 R431 3 with no load on the supply See Figure 6 1 for test point locat...

Page 35: ...2 Interface to A1 Main board A1J207 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 5 5 6 SW_POS Norm 5 5 7 RANGE_SELECT High 0 0 8 OS_TRIM_NEG COMP 1 7 1 7 OS_TRIM_NEG SCPI 4 0 4 0 9 5Vs 5 5 10 COMMON 0 0 11 COMMON 0 0 12 15Vs 15 15 13 15Vs 15 15 14 HS_THERM 25C 2 5 2 5 1...

Page 36: ... 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 i Press Enter Disabling Protection Features The power supply s protection features may be disabled This is not recommended as a normal operating condition but is helpful ...

Page 37: ...ard near the GPIB connector The switch has 2 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 Switch 3 Switch 4 Normal Off Off Clear Password Off On Inhibit Calibration On Off Calibrat...

Page 38: ...uery 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 supply 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 th...

Page 39: ... 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 List of Required Tools ...

Page 40: ...e steps in reverse order Front Panel Assembly Removal and Replacement This procedure removes the front panel assembly from the dc power supply a Remove the Power Supply Cover as described earlier in Top Cover Removal and Replacement b Disconnect the cable between the Front Panel board and the Interface board at the Interface board You may have to remove the Interface board as described above to ac...

Page 41: ...d the chassis This wire is secured to the side of the chassis near the AC input by a Torx T10 screw d Remove two Torx T15 screws which secure the main control board to the chassis e Remove the Torx 15 screw that holds the main rectifier in the front right corner of the board f Slide the main board towards the front panel to release it from chassis mounted standoff and then lift the board out of th...

Page 42: ...ormer Wiring white red grey grey orange orange 1 2 3 4 5 6 7 Top part of transformer Front of unit white red grey grey orange white red grey grey orange orange white red grey grey orange 220 VAC spare orange spare orange white red white black white brown white brown white black white red red black white yellow white violet white yellow white violet white yellow white violet white yellow white viol...

Page 43: ... Connector Signal Description Front panel outputs OUT OUT Positive DC output voltage Negative DC voltage or return Rear panel output sense screw terminals OUT OUT sense sense common Positive DC output voltage Negative DC voltage or return OUT sensing terminal1 OUT sensing terminal1 connected to ground conductor 1 Set SENSE switch to Remote when using the sensing terminals INH FLT connector pin 1 p...

Page 44: ...ircuits 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 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 bi...

Page 45: ... multiplexer returns data from the following measurement signals 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 to 5V which corresponds to the zero to full scale readback capability of the dc power supply The 8 channel 8 bit ADC returns the follow...

Page 46: ... 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...

Page 47: ...r 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 ena...

Page 48: ......

Page 49: ...se sub min 5AM 125V F305 2110 0699 1 Fuse sub min 5AM 125V F306 2110 0699 1 Fuse sub min 5AM 125V F308 2110 0932 1 Fuse smt 5AM 125V F309 2110 0685 1 Fuse sub min 7AT 125V 6611C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6612C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6613C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6614C Output Fuse F310 2110 0932 1 Fuse smt 5AM 125V F311...

Page 50: ...J206 W 9 5080 2448 1 Interface Signal Bias Cable A1J307 to A2J207 W 10 06611 60056 2 T1 Primary Jumper W 11 5080 2605 1 Relay Cable J320 to relay board not used in 6611C 8120 4383 1 Line Cord std U S 115Vac input 8120 1351 1 Line Cord Option 900 8120 1369 1 Line Cord Option 901 8120 1689 1 Line Cord Option 902 8120 0698 1 Line Cord Option 904 8120 2104 1 Line Cord Option 906 8120 2956 1 Line Cord ...

Page 51: ...Replaceable Parts List 5 51 Figure 5 1 Mechanical Parts Identification ...

Page 52: ...M4x0 7x16mm Torx T15 Pan Conical cup MP15 06611 00004 1 Transformer Bracket MP16 0515 0430 4 Screw M3x0 5x6mm Torx T10 Pan Conical cup MP17 0380 0644 2 Stud Mounted Standoff ref GPIB Connector MP18 2190 0586 2 Helical Lock Washer M4 MP19 3050 0849 2 Flat Washer 10 MP20 5040 1722 1 Fan Spacer MP21 0515 2535 2 Screw M3x0 5x8mm Torx T10 Pan Head Thread rolling MP22 0515 0374 1 Screw M3x0 5x10mm Torx ...

Page 53: ...C 6613C and 6614C System DC Power Supplies Figure 6 1 A1 Board Component and Test Point Locations Sec Common Rail Rail J307 15Vs 15Vs 5Vs F310 R431 D307 D330 5Vp unreg Pri Common F311 F308 F305 F303 F306 J305 J304 J314 J306 J303 F309 Heat Sink Conductor Side J320 Relay Opt Grn Yel Yellow Orange Red Brown White Gray Violet Blue None 5Vp ...

Page 54: ...6 Diagrams 54 Figure 6 2 A1 Board Block Diagram ...

Page 55: ...Diagrams 6 55 Figure 6 3 A2 A3 Boards Block Diagram ...

Page 56: ...cuit 5V Sec Sec Com U304 U307 U306 J303 F305 1 2 U305 Pri Com 5V Pri E321 E320 E324 Black Red White 8Vac 8Vac 20Vac 26V 5Vp Unreg 3 2 1 4 nu J206 J211 5V A2 A3 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 J111 5V J307 J207 13 10 14 12 11 22 23 21 27 14 13 10 11 12 21 22 23 27 20Vac 20Vac 11Vac T1 P S P P A1 F311 2 F310 F308 J306 D330 R419 R423 R422 ...

Page 57: ...ltage tests 15 Control 45 46 copyrights 5 cover removal 40 current monitoring resistor 14 current sink 18 CV 34 CV load effect 15 CV loop 46 CV Noise 16 CV source effect 16 CV CC control 45 46 CV_Detect 44 46 CV_Prog 45 46 D DAC 44 disable protection 36 disassembly tools 39 disassembly procedure 39 downprogramming 45 47 DP_Control 45 E EEPROM 45 electronic load 13 electrostatic discharge 10 error ...

Page 58: ...o 46 ROM upgrade 38 RPG 44 RS 232 43 S safety considerations 9 safety summary 3 schematic notes 53 SCR 46 47 secondary interface 44 self test 33 sense 43 sense switch 46 serial number 5 series regulator 45 shunt clamp 46 47 status annunciators 34 T Temp_Amb 45 test equipment 11 test setup 12 trademarks 5 transformer removal 41 transient recovery 16 troubleshooting bias and reference supplies 34 35...

Page 59: ...nal print date 4 25 03 Information about serial numbers and manual revisions has been updated on pages 5 and 10 Information has been corrected on page 18 and pages 22 25 to comply with ISO 17025 10 2 03 The ripple and noise specification limits have changed for Model 6614C on page 25 ...

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