Agilent 6012b - Manuals

7 1 Introduction Scope This manual contains information for troubleshooting the Agilent Models 6010A, 6011A, 6012B, or 6015A 1000WAutoranging Power Supply to the component level. Wherever applicable, the service instructions given in this manual referto pertinent information provided in the Operatio...

8 Manual Revisions Agilent Technologies instruments are identified by a 10-digit serial number. The format is described as follows: first twoletters indicate the country of manufacture. The next four digits are a code that identify either the date of manufacture or ofa significant design change. The...

9 2 Calibration and Verification Introduction This section provides test and calibration procedures. The operation-verification tests comprise a short procedure to verifythat the unit is performing properly, without testing all specified parameters. After troubleshooting and repair of a defectivepow...

12 Initial Setup Maintenance described herein is performed with power supplied to the instrument, and protective coversremoved. Such maintenance should be performed only by service trained personnel who are aware of the hazards involved (for example, fire and electrical shock). Turn off ac power whe...

16 Table 2-3. Guide to Recalibration After Repair Printed Circuit Board Block Name Circuit Within Ref. Designator Perform These Procedures* A1 Main Board R11 R13 (6011A) 3 then 4 A1 Main Board T1, T2 5 A5 Diode Board CR4 CR5, CR1 (6011A) 5 A2 Control Board Constant Voltage(CV) Circuit All Except Cur...

17 for the electronic load in the following tests: CV Source Effect (Line Regulation)CC Load Effect (Load Regulation)Temperature Coefficient (6015A)Drift (stability ) (6015A) You may substitute: 40 Ω 1000W load resistor (6010A) 0.058 Ω 1000W load resistor (6011A) 3.4 Ω 1000W load resistor (6012B) 40...

19 g. When the reading settles, record the output voltage again. Check that the two recorded readings differ no more than: ± 0.011Vdc (6010A) ± 0.0037Vdc (6011A) ± 0.007Vdc (6012B) ± 0.033Vdc (6015A) Source Effect (Line Regulation). Source effect is the change in dc output voltage resulting from a c...

20 d. Reduce the resistance of the load to draw an output current of: 17.0Adc (6010A) 120Adc (6011A) 17.5Adc (6012B) 5.0Adc (6015A) Check that the unit's CV LED remains lighted. e. Check that the rms noise voltage at the true rms voltmeter is no more than:22mV rms (6010A)8.0mV rms (6011A)8.0mV rms (...

21 60Vdc (6012B) 200Vdc (6015A) d. Reduce the resistance of the load to draw an output current of: 17.0Adc (6010A) 120Adc (6011A) 17.5Adc (6012B) 5.0Adc (6015A) Check that the unit's CV LED remains lighted. e. Set the oscilloscope's input impedance to 50 Ω and bandwidth to 20MHz. Adjust the controls...

25 17.5Adc (0.0175Vdc across Rm) (6012B) Check that the AMPS display reads about 17.5 amps.2Adc (0.20Vdc across Rm) (6015A) Check that the AMPS display reads about 2 amps. d. Increase the load resistance until the output voltage at +S and -S increases to:200Vdc (6010A)20Vdc (6011A)60Vdc (6012B)500Vd...

27 3 Troubleshooting Maintenance described herein is performed with power supplied to the instrument, and protective coversremoved. Such maintenance should be performed only by service-trained personnel who are aware of the hazards involved (for example, fire and electrical shock). Where maintenance...

28 Table 3-1. Control Board Test Connector, A2J7 PIN NO. SIGNAL NAME Vdc WAVEFORM/CONDITIONS SOURCE Digital-Circuits Bias & Reference Voltages 24 +5V 5.0 A2Q9 (emitter) 22 + 20V(5V UNREG) 20.0 with 120Hz & 40KHz ripple A1CR2, A1CR5 14 2.5V ref 2.50 A2U7 (OUT) 6 0.5V ref 0.50 A2R84,A2R85, A2R...

29 Electrostatic Protection The following caution outlines important precautions which should be observed when working with static sensitivecomponents in the power supply. This instrument uses components which can be damaged by static charge. Most semiconductors cansuffer serious performance degrada...

30 To avoid the possibility of personal injury, remove the power supply from operation before opening thecabinet. Turn off ac power and disconnect the line cord, load, and remote sense leads before attempting any repair or replacement. When replacing any heatsink-mounted components except thermostat...

32 d. Lift the A1 board up and toward the rear, then remove the wires from the front panel switch A3S1. A1 Designator Wire color A3S1 Position (Rear View) A white/gray Upper right B gray Upper left C white/brown/gray Lower left D white/red/gray Lower right A3 FRONT PANEL ASSEMBLY S1 REAR VIEW B-- | ...

33 Make most voltage measurements (except DC-to-DC Converter and ac mains-connected circuits) referenced to the unit'soutput common. The output common is accessible at rear-panel M terminal. All voltages are ± 5% unless a range is given. Using the Tables Typically there will be two types of power su...

35 Figure 3-2. Modified Mains Cord Set For Troubleshooting With the mains cord unplugged proceed as follows: a. Remove the top cover and the inside cover as described on page 30. Remove fuse A1F1. Failure to remove fuse AlF1 will result in damage to the unit; damage to the external DC supply and ash...

38 Troubleshooting Bias Supplies +5V on A2 Control Board . The PWM A2U22 includes a clock generator (40KHz set by A2R170, A2C79, and A2Q10), and a current limit (2Adc set by 0.15Vdc across A2R172). It turns off each output pulse using the difference between thevoltage at voltage divider A2R161-A2R16...

40 Input: NODE ( + ) NODE ( - ) MEASUREMENT SOURCE A2C55(+) A2C55(-) ≈ 27Vdc A1U4, AlC16 ( - )A1U4, AlC18 ( - ) (6011A) Outputs: NODE ( + ) N0DE ( - ) MEASUREMENT A2J7-21 A2U12-3 (ADJ) -1.25Vdc A2J7-21 A2VR4 (Anode) -12.9Vdc A2C54 ( + ) A2C54 ( - ) 13.8Vdc To check if load on -15V is shorted, remove...

41 A2U15-10 cycle power transition lo to hi at 2.9 sec ( FAULT AC ) A2Q7-C cycle power transition 5.0 to 0.3Vdc at 2.5 sec ( ENABLE RELAY ) * NODE ( - ) = A2J7-4 Troubleshooting PWM & Clock The inputs to inhibit Gate A2U18A and PWM gate A2U18B are the keys to PWM troubleshooting. The 20KHz clock...

42 Troubleshooting DC-To-DC Converter Parallel NOR gates A4U1, A4U2 and A4U3A act as drivers and switch on FETs A4Q1, Q2, Q3 and Q4 through pulsetransformer A4T1. NOR gate A4U3B turns off the FETs through pulse transformer A4T2 and transistors A4Q5 and A4Q6. Circuits Included. On-Pulse Driver, Off-P...

44 Outputs: NODE ( + ) EXTERNAL SUPPLY MEASUREMENT A5C3 (+) ON/OFF 10Vdc A5VR1(K) ON/OFF 6.5Vdc A5U1-3 ON/OFF 0.2Vdc A5CR2(K) OFF 1.8Vdc A5CR2(K) ON 0.2Vdc A5U1-1 OFF 0.5Vdc A5U1-1 ON 5.0Vdc +R20 OFF <0.001Vdc +R20 ON 1.5Vdc NODE ( - ) = A2J7-4 Troubleshooting CV Circuit V-MON, the output of CV M...

45 Circuits Included. Constant Current (CC) Circuit on A2 control board. Setup. The Main Troubleshooting Setup, page 33, except connect the external supply with polarity reversed to the unit's + OUT ( - ) and - OUT ( + ) terminals. Apply the ac mains voltage to the isolation transformer. Set the ext...

47 4 Principles of Operation Autoranging Power Autoranging allows the unit to be compact and light weight and yet to deliver a range of output voltage/currentcombinations which would otherwise require the use of more than one supply or a higher rated power supply. Autorangingis a name for circuitry ...

48 Regulation & Control Subsystem This sub-system may be considered to be the brains of the unit. It provides the control pulses to open and close theswitching elements which deliver power to the output. This section also regulates the output to ensure that the unit isdelivering a constant power...

51 Table 4-1. Quick Reference Guide to Major Circuits Dependent Circuits Circuit Major Function Input from Output to Operation Bias PowerSupply (BPS) Provides Bias andReference Voltage. Mains Control Circuits Mains voltage at BVS input isconverted to lower voltage levels toprovide the internal opera...

57 5 Replaceable Parts Introduction This chapter contains information for ordering replacement parts. Table 5-3 lists parts in alpha-numeric order by referencedesignators and provides the following information: a. Reference Designators. Refer to Table 5-1. b. Agilent model in which the particular pa...

58 Ordering Information To order a replacement part, address order or inquiry to your local Agilent Technolgies sales office. Specify the followinginformation for each part: Model, complete serial number, and any option or special modification (J) numbers of theinstrument; Agilent part number; circu...

79 6 Component Location and Circuit Diagrams This chapter contains component location diagrams, schematics, and other drawings useful for maintenance of the powersupply. Included in this section are: a. Component location illustrations (Figures 6-1 through 6-6), showing the physical location and ref...

80 Table 6-1. Schematic Diagram Notes (continued) 8. indicates multiple paths represented by only one line. Reference designators with pinnumbers indicate destination, or signal names identify individual paths. Numbersindicate number of paths represented by the line. 9. For single in-line resistor p...

91 A System Option 002 (6010A, 6011A, 6012B) General Information This option facilitates the operation of the power supply in an automated system. Four major circuit blocks provide:1 ) remote analog programming of the supply's output by three different control methods; 2) signals indicating thepower...

93 Table A-1. Specifications, Option 002 (continued) Voltage Range: +4.75V to 16V Current Drain: 20mA maximum Status Indicator output:Open collector output: Maximum Output Voltage (logic high) : + 16V Logic Low output: + 0.4V maximum at 8mA Remote Control (Trip, Reset, Inhibit) Control Isolator Bias...

95 Installation When installing the board, perform the following steps: a. Remove the top and inner cover of the power supply as discussed in Section 3 under Repair and Replacement. b. Remove the plate next to the barrier strip on the rear panel of the supply by unscrewing the 2 M3 screws. c. Insert...

96 Figure A-1. Mating Connector Assembly Operation The following paragraphs provide the operating instructions necessary to interface a 002-equipped power supplyinto an automated system. A brief description of some circuits is also provided. The unit is shipped for front paneloperation with mode swi...

97 Figure A-2. 002 Option Rear Panel Connector J3 and Switches A1 and A2. Local/Remote Programming When switching to local/ control, remember to set Front Panel Voltage and Current Control to safelevels. Local Programming (Figure A-3). The supply can be switched back and forth between remote and loc...

99 Figure A-4. Calculating Value of Series Dropping Resistor Remote Resistance Programming Check switches A1 and A2 on the rear panel, they must be in their correct positions for CV and CCresistance/voltage programming (see Figure A-2). A resistance variable from 0 to 4K ohms can be used to programt...

101 Current Programming (Figure A-7). Check switches A1 and A2 on the rear panel, they must be in the correct positions for CV and CC current programming (see Figure A-2). A current sink variable from 0 to 2mA, can be usedto program the output voltage or current from 0 to full scale (see Figure A-7)...

103 Remote Trip. A negative-going edge applied to terminal J3-30 ( TRIP REMOTE ) will shut down the power supply, reducing the output voltage to near zero. For minimum pulse duration and timing considerations with respectto RESET REMOTE , see Table A-1. The following paragraph provides a brief circu...

105 AC Dropout Buffer Circuit This circuit couples, inverts and isolates the DROPOUT signal (received from the A2 Control Board) of statusoutput terminal J3-19 ( DROPOUT ). The dropout signal indicates loss of primary power, momentary AC dropout,or "brownout" conditions where the AC line vol...

106 If it is necessary to have all the supplies come up simultaneously after a system shutdown, follow this procedure: a. First bring the INHIBIT REMOTE line low. b. Provide a negative-going pulse to the RESET REMOTE . c. After at least one second, return INHIBIT REMOTE to a high level. Figure A-10....

107 Troubleshooting Before attempting to troubleshoot the 002 Option Board, ensure that the fault is with the option itself and not withthe main power supply. This can be accomplished by removing the top cover, inside cover and disconnecting thetwo ribbon cables from the A2 Control board and checkin...

109 Figure A-13. Troubleshooting Status Indicators To check Mode CV proceed as follows: a. Using test set-up, Figure A-13, connect to end of 2K Ω resistor to J3-36. b. Turn on power supply. c. Using "Display Setting'' set voltage and current or power supply for 1 volt and 1 amp. d. DVM should re...

110 b. Connect output terminals of power supply to an electronic load capable of exceed the power supplies outputpower rating by 50%. c. Turn on power supply. d. DVM should read approximately 5Vdc. e. Set voltage and current controls of power supply to maximum. f. Decrease resistance of electronic l...

112 Table A-3. Replacement Parts REF. DESIG. MODEL NO, PART NO. DESCRIPTION R22 All 0686-1525 fxd. film 1.5K 5% 1/4W R23 All 0683-1535 fxd. film 15K 5% 1/4W R24 All 0683-4715 fxd. film 470 5% 1/4W R25,26 All 0683-1235 fxd. film 12K 5% 1/4W R27 All 0686-1525 fxd. film 1.5K 5% 1/4W R28 All 0683-1535 f...

119 B Backdating Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers arelower than those listed in the title page to this manual. Look in the following table and locate your Agilent Model. Then look at each serial number listed for this group....

120 Model 6012B Change Model 6015A Change Serial Numbers Serial Numbers PREFIX NUMBER PREFIX NUMBER US3543 0101-0335 1 US3705 0101-0145 1 3543A 04801-05360 1 3705A 00444-00518 1 3415A 04311-04800 1,2 3543A 00344-00443 1,2 3319A 04091-04310 1-3 3424A 00244-00343 1-3 3303A 04061-04090 1-4 3402A 00229-...

121 R6, 1.3K, p/n 0811-1803U2, U4, Rectifier, p/n 1906-0006 Delete: C27, C34, 0.01 µ F 400V, p/n 0160-6805 CR6-CR13, power rectifier 400V, p/n 1901-0731R24, 200 5% 1/2W, p/n 0686-2015R43, R44, 2.61K 1% 1/8W, p/n 0698-0085R45, 82.5K 1% 1/8W, p/n 0757-0463R46, 681 1% 1/8W, p/n 0757-0419R47, R48 150 5%...

122 C1, C2, C4-C6, C8 to p/n 0180-3460C10 to p/n 0180-0426DS1 to p/n 1990-0325K1 to p/n 0490-1457K2 to p/n 0490-1341R5 to p/n 0686-3015R7 to p/n 0686-1005R8 to p/n 0686-3335R41 to p/n 0811-1869CR1 to p/n 1901-0028 Under AC Input Filter, change p/n to 06011-60025 Subtract 100 from all of the referenc...

123 C1, C2, C4-C6, C8 to p/n 0180-3460C10 to p/n 0180-0426DS1 to p/n 1990-0325K1 to p/n 0490-1457K2 to p/n 0490-1341R5 to p/n 0686-3015R7 to p/n 0686-1005R8 to p/n 0686-3335R41 to p/n 0811-1869CR1 to p/n 1901-0028 Under AC Input Filter, change to p/n 06011-60028. Subtract 100 from all of the referen...

125 CHANGE 13 6010A In the option 002 (Appendix A) parts list and schematic diagram delete R57 and solder pin p/n0360-1300. 6011A In the parts list for the A1 Main Board Assembly change C17, C18 to 1000 µ F 50V, p/n 0180- 3019. Change C10 to 22 µ F 250V, p/n 0180-0426. 6012B In the option 002 (Appen...

126 CHANGE 18 6012B In the parts list for A6 AC Input Filter delete capacitor C9. CHANGE 19 6012B In the parts list for CHASSIS MECHANICAL, change front frame casting to p/n 021-8803;chassis to p/n 06032-00001; front sub-panel to p/n 06032-00009; handle retainer (front) to 5040-7219 and handle retai...