HP 6033A series Service Manual
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HP 6033A series Service Manual

Autoranging system dc power supply
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SERVICE MANUAL
AUTORANGING
SYSTEM DC POWER SUPPLY
HP MODELS 6033A and 6038A
HP Part No. 5959-3346
FOR INSTRUMENTS WITH SERIAL NUMBERS
HP Model 6033A; Serials US38320231 and above
HP Model 6038A; Serials US38310401 and above
For instruments with higher serial numbers, a change page may be included.
Microfiche Part No. 5959-3347
Printed in USA: December, 1999

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Summary of Contents for HP 6033A series

  • Page 1 HP MODELS 6033A and 6038A HP Part No. 5959-3346 FOR INSTRUMENTS WITH SERIAL NUMBERS HP Model 6033A; Serials US38320231 and above HP Model 6038A; Serials US38310401 and above For instruments with higher serial numbers, a change page may be included.

  • Page 2: Limitation Of Warranty

    (defined as destination local currency price, or U.S. or Geneva Export price). If HP 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 HP.

  • Page 3: Safety Summary

    SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service and repair 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. Hewlett-Packard Company assumes no liability for the customer’s failure to comply with these requirements.

  • Page 5: Table Of Contents

    Electrostatic Protection............................... 30 Repair and Replacement ..............................30 A2 Control Board Removal ............................31 A4 FET Board Removal ..............................31 A8 HP-IB Board Removal.............................. 32 A3 Front-Panel Board Removal............................32 A1 Main Board Removal..............................32 Overall Troubleshooting Procedure............................ 33 HP-IB Section Troubleshooting............................33 Primary Interface Troubleshooting .............................
  • Page 6 Troubleshooting CC Circuit............................58 Troubleshooting OVP Circuit............................59 Troubleshooting PWM & Clock............................. 59 Principles of Operation ................................ 61 Introduction ..................................61 HP-IB Board..................................61 Primary Microprocessor ..............................61 Address Switches................................61 EEPROM..................................63 Isolation ..................................63 Secondary Microprocessor ............................. 63 Digital-to-Analog Converters ............................
  • Page 7 Ordering Information................................74 Component Location and Circuit Diagrams ........................91 l00 Vac Input Power Option 100 ............................99 General Information................................99 Description ..................................99 Scope of Appendix A..............................99 Suggestions for Using Appendix A..........................99 Chapter 1 Manual Changes............................. 99 Chapter 2 Manual Changes.............................

  • Page 9: Introduction

    This manual contains information for troubleshooting the HP 6033A/6038A 200W Autoranging Power Supply to the component level. Wherever applicable, the service instructions given in this manual refer to pertinent information provided in the Operation Manual (P/N 5959-3301). Both manuals cover HP Models 6033A/6038A; differences between models are described as required.

  • Page 10: Manual Revisions

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

  • Page 11: Calibration And Verification

    Operating Manual. Repairs to the A1 main board, the A2 control board and the A8 HP-IB board can involve circuits which, although functional, may prevent the unit from performing within specified limits. So, after A1, A2 or A8 board repair, decide if recalibration and operation verification tests are needed according to the faults you discover.
  • Page 12 Multimeter Resolution: 100nV P,C,T HP 3458A Accuracy: 0.0035%, 6½ digit Signature Analyzer HP 5004A HP-IB Controller Full HP-IB capabilities C,T,P HP Series, 200/300 Current Probe No saturation at 30Adc Tektronix P6303 Probe/ Bandwidth: 20Hz to 20MHz AM503 Amp/ TM500 Power Module...
  • Page 13 Power Limit Calibration A2 Control Board Bias Power Supplies All Calibration Procedures ( + & -15V Supplies) A8 HP-IB Board Voltage Monitor Buffer Voltage Monitor Zero Calibration Remote Readback Zero Calibration Constant Voltage Full Scale Calibration Voltage Monitor and Remote Readback Full...

  • Page 14: Initial Setup

    Disconnect all loads from output terminals. Connect power supply for local sensing, and ensure that MODE switches are set as shown below. Connect an HP-IB controller to the power supply. Reconnect line cable and turn on ac power. Allow unit to warm up for 30 minutes.

  • Page 15: Voltage Monitor Zero Calibration

    Maintenance described herein is performed with power supplied to the instrument, and protective covers removed. Such maintenance should be performed only by trained service personnel who are aware of the hazards involved (for example, fire and electrical shock). Where maintenance can be performed without power applied, the power should be removed.

  • Page 16: Remote Readback Zero Calibration

    Remote Readback Zero Calibration Note: This procedure and the following three procedures must be done as a set, without omitting any of the four procedures. Also, the following four procedures require that V-MON ZERO (A2R22) be adjusted within specifications. If it is not, perform the Voltage Monitor Zero Calibration before proceeding. Connect an external supply to the power supply as shown in Figure 2-2.

  • Page 17: Voltage Monitor And Remote Readback Full Scale Calibration

    Attach the DVM from - S to + S terminals on rear panel. Adjust A8R58 (CV PROG F.S.) to: 20.0025 ±600µV (6033A). 60.0075 ±1.82mV (6038A). After adjusting A8R58 you must continue the calibration procedure through to the completion of Constant Voltage Zero Calibration.

  • Page 18: Constant Current Zero Calibration

    "VSET 5; ISET 10; OUT ON" (6038A). Attach DVM from M to IM on the rear panel. Use six-digit display on HP 3458A DVM. Take initial reading from DVM. Attach DVM across Rm. Allow several minutes (3 or more) to ensure thermal settling. This can be noted as a stable reading on the DVM.

  • Page 19: Constant Current Full Scale Calibration

    Constant Current Full Scale Calibration Note: This procedure requires that CC PROG ZERO (A8R29) and I-MON F. S. (A2R9) be adjusted within specifications. If they are not, perform Constant Current Zero and/or Current Monitor Full Scale Calibration before proceeding. Connect Rm current-monitoring shunt: (10 milliohm, 6033A) (100 milliohm, 6038A) 0.05% or better across power supply output terminals.

  • Page 20: Performance Tests

    Attach the DVM from P to VP on the rear panel. Adjust A2R23 (R-PROG F.S.) to 2.5V ±4mV. Remember to reset MODE switches to original settings. Performance Tests The following paragraphs provide test procedures for verifying the unit’s compliance with the specifications of Table 1-1 in the Operating Manual.

  • Page 21: Constant Voltage (Cv) Tests

    For these tests, use the shunt listed in Table 2-1. Figure 2-4. Current-Monitoring Resistor Setup HP-IB Controller. Most performance tests can be performed using only front-panel controls. However, an HP-IB controller is required to perform the voltage and current programming accuracy tests and the voltage and current readback accuracy tests.
  • Page 22 Run the program listed in step e. The value displayed by the controller should be the value noted in step h: ± 0.02Vdc (6033A). ± 0.092Vdc (6038A). Load Effect (Load Regulation). Constant-voltage load effect is the change in dc output voltage (Eo) resulting from a load-resistance change from open-circuit to full-load.
  • Page 23 Connect the test equipment as shown in Figure 2-5. Operate the load in constant resistance mode (Amps/Volt) and set resistance to maximum. Connect the unit to the ac power line through a variable autotransformer which is set for nominal line voltage. Turn the unit’s power on, and, using DISPLAY SETTINGS pushbutton switch, turn up current setting to full output.
  • Page 24 Figure 2-6. RMS Measurement Test Setup, CV PARD Test Figure 2-7. Peak-To-Peak Measurement Test Setup, CV PARD Test...
  • Page 25 Connect the test equipment as shown in Figure 2-7. Operate the load in constant resistance mode (Amps/Volt) and set resistance to maximum. Turn the unit’s power on, and, using DISPLAY SETTINGS pushbutton switch, turn up current setting to full output. Turn up output voltage to: 7Vdc (6033A).

  • Page 26: Constant Current (Cc) Tests

    Current Programming And Readback Accuracy. This procedure verifies that the current programming and readback functions are within specifications. An HP-IB controller must be used for this test. The accuracy of the current shunt resistor (Rm) must be 0.02% or better. Proceed as follows: Connect test setup shown in Figure 2-5, except replace the load with a short circuit.
  • Page 27 Load Effect (Load Regulation). Constant current load effect is the change in dc output current (Io) resulting from a load-resistance change from short-circuit to full-load, or full-load to short-circuit. Full-load is the resistance which develops the maximum rated output voltage at current Io. Proceed as follows: Connect the test equipment as shown in Figure 2-5.

  • Page 28: Initialization Procedure

    5mA rms (6038A). Initialization Procedure Follow the procedure if either the HP-IB assembly has been replaced, or the EEPROM (U70) has been replaced: Install the HP-IB assembly in the unit. Turn the power on and depending on your unit’s model number, send string: "EEINIT 6033"...

  • Page 29: Troubleshooting

    Check that all connections to the power supply are secure and that circuits between the supply and external devices are not interrupted. Check that the rear-panel HP-IB address switch A8S1 is properly set. (See Operating Manual). If the power supply fails turn-on self-test or gives any other indication of malfunction, remove the unit from the operating system before proceeding with further testing.

  • Page 30: Electrostatic Protection

    Use a mildly activated rosin core solder (such as Alpha Metal Reliacor No. 1, HP Part No. 8090-0098) for repair. The flux residue of this type of solder can be left on the printed circuit board. Generally, it is safer not to clean the printed-circuit board after repair.

  • Page 31: A2 Control Board Removal

    When installing the inside cover, insert it first at the right side. While holding it tilted up at the left, reach through the cutouts in the cover and fit the top tabs of the A8 HP-IB board into the mating slots in the cover. Then repeat the process for the A2 control board tabs and slots.

  • Page 32: A8 Hp-Ib Board Removal

    Remove the A8 board as follows: Remove the two screws (Pozidriv, M3x.5) which attach the A8 HP-IB board to the rear panel. Remove the single screw (Pozidriv, M4x.7) that secures the HP-IB board to the side frame near the front corner.

  • Page 33: Overall Troubleshooting Procedure

    The HP-IB/ microprocessor related circuit blocks are located on the A3 (front panel) and the A8 (HP-IB) boards. They are referred to collectively as the HP-IB section. The power supply circuit blocks are on the A1 (main), the A2 (control), the A4 (FET), and the A5 (diode) boards. They are referred to collectively as the power section.
  • Page 34 Figure 3-1. Troubleshooting Isolation...
  • Page 35 Figure 3-1. Troubleshooting Isolation (continued)

  • Page 36: Primary Interface Troubleshooting

    Primary signature analysis may be used to further troubleshoot these circuits, but since the address and data lines go to so many IC’s, it may not be cost-effective to narrow an incorrect signature to a specific chip. HP-IB board replacement may be the most cost-effective solution.
  • Page 37 Figure 3-3. Clock and Primary SA Waveforms...

  • Page 38: Secondary Interface Troubleshooting

    Note: Data and address lines may not toggle if one line is shorted either high or low. If no short is found, replace all socketed IC’s. If the data lines still do not toggle, replace the HP-IB (A8) assembly. Node...

  • Page 39: Readback Dac Circuits

    CV DAC Circuits Node Setup Measurement U69-6 Voltage set to 0. Voltage set to max. + 5V U64-6 Voltage set to 0. Voltage set to max. -10V CC DAC Circuits Node Setup Measurement U68-6 Current set to 0. Current set to max. + 5V U65-6 Current set to 0.
  • Page 40 Figure 3-4. Readback and Secondary SA Waveforms...

  • Page 41: Signature Analysis

    Be certain to use the correct setup for the signature being examined. Most signatures are taken on the HP-IB, and front panel assemblies. Note the signatures for Vcc and ground on the I.C. being examined. If an incorrect signature is the same as that of Vcc or ground, that point is probably shorted to Vcc or ground.

  • Page 42: Secondary Sa

    Return the J5 jumper to its normal position when the front panel signature analysis is complete. Secondary SA For secondary SA troubleshooting, connect the signature analyzer as shown in Table 3-3. Use a jumper wire and short U4 pin 21 to common (U4 pin 20). Check for the waveforms in Figure 3-4 and the signatures in Table 3-8 for the secondary SA.
  • Page 43 Table 3-4. Primary Processor Signature Table (A8U6 = P/N 5080-2160 REV A.00.00, A.00.01, A.00.02 and A.00.04) A.00.04 A.00.02 A.00.01 A.00.00 A(0) A46A A46A A46A A46A U16-12 U6-12 U8-12 U12-11 U17-21 A(1) 4148 UH8O UH8O UH8O U16-13 U6-11 U8-11 U12-13 U17-22 A(2) 72F5 82H5...
  • Page 44 Table 3-5. Front Panel LED Display and Indicator Drivers (A8U6 = P/N 5080-2160 REV A.00.00, A.00.01, A.00.02 and A00.04 Inputs) Inputs: Node Measurement U1 to U10-1 6H15 U1 to U10-9 Cycle power to unit--Lo to Hi after approx. 160 ms U1 to U10-2,14 U1 to U10-7 common...
  • Page 45 Table 3-6. Front Panel Address Latches and Decoders (A8U6 = P/N 5080-2160 REV A.00.00, A.00.01, A.00.02 and A.00.04 Inputs) Inputs: Node Measurements U14-26 Toggling (unstable) U14-35 37F8 U14-38 1ABC U15-9, U17-3,6 Cycle power to unit--Lo to Hi after approx. 160 rns U17-4,5 Cycle power to unit--Hi to Lo after approx.
  • Page 46 Table 3-7. Front Panel RPG Latches and Input Port (A8U6 = P/N 5080-2160 REV A.00.00, A.00.01 A.00.02, and A.00.04) Inputs: Node Measurement U11-1 1ABC U11-2 U12-4,10 Toggling (unstable) U16-10 9H84 Procedure: Node S1 LCL released U11-13 Lo U11-7, U16-9 U16-8 Hi S1 LCL depressed U11-13 Hi...

  • Page 47: Power Section Troubleshooting

    Table 3-8. Secondary Processor Signature Table DS(0) P36U U4-1 U7-15 U9-15 U11-15 DS(1) 2280 U4-2 U7-14 U9-14 U11-14 DS(2) 4277 U4-3 U7-13 U9-13 U11-13 DS(3) 720F U4-4 U7-12 U9-12 U11-12 DS(4) 6A31 U4-5 U7-11 U9-11 U11-11 DS(5) 662U U4-6 U7-10 U9-10 U11-10 DS(6)

  • Page 48: Main Troubleshooting Setup

    To troubleshoot the power supply the A4 power FET board and A2 control board can be raised out of the unit using extender boards and cables provided in service kit P/N 5060-2865. Main Troubleshooting Setup Figure 3-5 shows the troubleshooting setup for troubleshooting all of the unit except the front panel and initial no-output failures (see Page 49).

  • Page 49: Troubleshooting No-Output Failures

    An isolation transformer provides ac voltage that is not referenced to earth ground, thereby reducing the possibility of accidentally touching two points having high ac potential between them. Failure to use an isolation transformer as shown in Figure 3-5 will cause the ac mains voltage to be connected directly to many components and circuits within the power supply, including the FET heatsinks, as well as to the terminals of the external dc power supply.

  • Page 50: Power Section Blocks

    Figure 3-6. Modified Mains Cord Set For Troubleshooting Power Section Blocks This section contains the blocks referenced in Tables 3-10 and 3-11.
  • Page 51 Table 3-9. Control Board Test Connector, A2J7 PIN NO. SIGNAL NAME WAVEFORM/CONDITIONS SOURCE Digital-Circuits Bias & Reference Voltages A2Q3 (emitter) + 20V(5V UNREG) 20.0 with 120Hz & 45KHz ripple AlCR6, AlCR7 2.5V ref 2.50 A2U9 (OUT) 0.5V ref 0.50 A2R79,A2R80 Analog-Circuits Bias Voltages +15V 15.0...
  • Page 52 Table 3-10. Performance Failure Symptoms DEFECTIVE SYMPTOMS BOARD CHECK FUNCTIONAL CIRCUITS unexplained OVP shutdowns OVP circuit, CV circuit no current limit CC circuit max current < 10Adc (6038A) CC Clamp, CC circuit < 30Adc (6033A) max power < specified A2, A1 Power Limit, 20KHz clock, transformer AlT1 max voltage <...

  • Page 53: Troubleshooting Ac-Turn-On Circuits

    Troubleshooting AC-Turn-On Circuits Relay AlK1 closes at 1.0 seconds and DROPOUT goes high at 1.1 seconds after 20V (5V UNREG) reaches about 11Vdc. DROPOUT high enables the PWM if OVERVOLTAGE , INHIBIT , and OVERTEMP are also high. Circuits Included. AC-Surge-&-Dropout Detector, Bias Voltage Detector, U11A, 1-Second Delay and Relay Driver--all on A2 control board.

  • Page 54: Troubleshooting Bias Supplies

    If all the INPUT measurements are correct but the OUTPUT Vgs waveform (3) is incorrect, the problem may be caused by weak PFETs. Two 6800pF capacitors (HP PN 0160-0159) can be substituted for the PFETs (G to S) to check waveform 3.
  • Page 55 ≈ 20V pk, 5µs pulses, 45KHz A2Q3 (emit) A2U5 (OUT) 2.5 Vdc ≈ 0 >V > 0.007Vdc A2R50, A2CR11 (anode) A2R46, A2R47 2.5 Vdc To check if load on + 5V is shorted, remove jumper A2W3 +15V On A2 Control Board. Voltage regulator A2U12 regulates the voltage across resistor A2R29 to be 1.25Vdc. That sets the current through zener diode A2VR1 at 7.5mAdc.
  • Page 56 Figure 3-7. Waveforms...

  • Page 57: Troubleshooting Down Programmer

    -15 V On A2 Control Board. Voltage regulator A2U4 regulates the voltage across resistor A2R32 to be 1.25Vdc. Circuit Included. -15 Vdc bias supply circuitry from connector pin A2P1-30 through test point A2J3-21 on A2 control board. Setup. The Main Troubleshooting Setup, Page 48. Apply the ac mains voltage to the bias transformer, and set the external supply to 0Vdc.

  • Page 58: Troubleshooting Cv Circuit

    Troubleshooting CV Circuit V-MON, the output of CV Monitor Amp A2U7 is the voltage between + S and - S. CV Error Amp A2U8 compares V-MON to CV PROGRAM. Innerloop Amp A2U10A stabilizes the CV loop with IVS input from A2U10C. The measurements below verify that the operational amplifier circuits provide expected positive and negative dc voltage excursion when the CV loop is open and the power mesh shut down.

  • Page 59: Troubleshooting Ovp Circuit

    If the failure symptoms include output current oscillation, check if the differentiator circuit is at fault by removing resistor A2R16. If oscillations stop, the differentiator is probably at fault. Troubleshooting OVP Circuit Comparator A2U14D sets, and gate A2U17A resets flipflop A2U14B-A2U14C. TTL low at A2U14-1,8,13 inhibits the PWM.
  • Page 60 Inputs: NODE SETUP MEASUREMENT SOURCE A2J3-1 5.0Vdc A2Q3 (emitter) A2U19-1 A2U17D-11 A2U19-2 remote inhibit A2U19-4 A2U14-1,8 A2U19-5 A2U11B-6 A2U19-10 A2U16-7 A2U19-12 POWER LIMIT fully A2U14-2 A2U19-12 POWER LIMIT fully A2U14-2 Outputs: SET VOLTAGE (Vdc) NODE EXT. INT. SETUP MEASUREMENT A2U21-7 TTL sq wave, 320KHz A2U22-3 TTL sq wave, 160KHz...

  • Page 61: Principles Of Operation

    It communicates with the secondary microprocessor through two serial link data lines that are optically coupled to provide the proper isolation of the user interface from the power mesh. The HP-IB board also has a ROM, which contains the operating firmware, and a RAM, which stores variables such as programmed voltage and current and readback values.
  • Page 62 Figure 4-1. HP-IB Block Diagram...

  • Page 63: Eeprom

    Output voltage and current are controlled by two 12-bit DACs whose digital inputs are directly connected to the secondary microprocessor. The microprocessor programs the DACs according to data received over the HP-IB or from the front panel rotary pulse generator. The DAC circuits also include buffers and compensation amplifiers.

  • Page 64: Front Panel Board

    DATA UP. Circuits on the front-panel board operate from bias voltages supplied from the HP-IB board, and are referenced to the same common as the HP-IB board (earth ground). The OVP ADJUST potentiometer is part of the power mesh control circuitry (referenced to power supply negative output), and is not connected to any circuits on the front-panel board.
  • Page 65 Figure 4-2. Front Panel Block Diagram...

  • Page 66: Mode Indicators

    Power Clear The power clear signal ( PCLR ) from the HP-IB board goes low when the unit is turned on, and remains low until the bias power supplies have stabilized. This low level resets the display-circuit latches on the front panel board, causing all indicators and display segments to turn on and remain on until the microprocessor updates the display (approximately one second).
  • Page 67 Figure 4-3. Output Characteristics; Typical, Dual Range, and Autoranging Supplies Figure 4-4. FET Control Signals Timing Diagram...

  • Page 68: Ac Turn-On Circuits

    Figure 4-5 is a block diagram of the power mesh. These circuits convert the ac input power to approximately 300Vdc, and convert this dc voltage to the proper dc output voltage. AC Turn-On Circuits Primary power comes to the input rectifier through a resistor which limits turn-on inrush current to the input filter. Jumper A1W5 connects the input rectifier and filter as a voltage doubler for 100/120Vac power lines.

  • Page 69: Down Programmer

    CONTROL VOLTAGE. Two comparison amplifier loops accomplish the comparison. In the outerloop, CV error amplifier A2U8 compares V-MON, a buffered fraction of the sensed output voltage OVS, to the programming voltage from the HP- IB board, to create the CV ERROR VOLTAGE. Then in the innerloop, amplifier A2U10A compares this error voltage to IVS, a buffered fraction of the innerloop output voltage, to produce the CV CONTROL VOLTAGE.

  • Page 70: Constant-Current (Cc) Circuit

    VOLTAGE to about 5.6 peak volts. Settings of the rear-panel CC programming switches--the B3, B2 and B1 MODE switch settings--allow the CC PROGRAM VOLTAGE to come from the HP-IB board, from an external voltage applied between terminals IP and P, or from an external resistor between IP and P.

  • Page 71: Initial-Ramp Circuit

    then CV sets CP to less than + 1.5Vdc. CV keeps diodes A2CR19 reverse biased and prevents CC control until the CC CONTROL VOLTAGE is even lower. The lower of the control voltages varies between about - 0.5Vdc and + 1.0Vdc regulating the unit’s output. The higher control voltage has no effect on the output and increases in response to the error voltage in its circuit.

  • Page 72: 1-Second-Delay Circuit

    1-Second-Delay Circuit The 1-second-delay circuit is the heart of the unit’s controlled turn on. It causes relay A1K1 to bypass inrush current-limiting resistor A1R1 one second after turn on, and it enables the PWM 0.1 second later. When either the output of the ac-surge-&-dropout detector or PCLR2 is low NAND gate A2U11A holds the circuit reset.

  • Page 73: Replaceable Parts

    Replaceable Parts Introduction This chapter contains information for ordering replacement parts. Table 5-3 lists parts in alpha-numeric order by reference designators and provides the following information: Reference Designators. Refer to Table 5-1. Hewlett-Packard model in which the particular part is used. Hewlett-Packard Part Number.

  • Page 74: Ordering Information

    Ordering Information To order a replacement part, address order or inquiry to your local Hewlett-Packard sales office. Specify the following information for each part: Model, complete serial number, and any Option or special modification (J) numbers of the instrument; Hewlett-Packard part number; circuit reference designator; and description. To order a part not listed in Table 5-3, give a complete description of the part, its function, and its location.
  • Page 75 Table 5-3. Replaceable Parts List Ref. Desig. HP Model HP Part Number Description 6033A 06023-60021 Main Board Assembly 6038A 06038-60021 Main Board Assembly both 0160-7606 cap 1µF +10% 50Vac C2,3 both 0180-3426 cap 590µF +50-10% 400V both 0180-3427 cap 300µF +50-10% 200V...
  • Page 76 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description 6033A 8151-0013 wire, tinned copper, AWG 22 6038A 0698-6359 res 80K 0.1% 1/8W both 0698-6322 res 4K 0.1% 1/8W both 0698-8695 res 36K 0.1% 1/8W 6033A 0698-3572 res 60.4 1% 1/8W...
  • Page 77 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description 6033A 0160-4801 cap 100pF 5% 100V 6038A 0160-4812 cap 220pF 5% both 0160-5422 cap 0.047µF 20% 50V both 0160-4812 cap 220pF 5% 100V both 0160-5377 cap 2.2µF 10% 63V...
  • Page 78 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description C57,58 both 0160-5422 cap 0.047µF 20% 50V both 0160-4812 cap 220pF 5% 100V both 0160-5422 cap 0.047pF 20% 50V both 0160-4812 cap 220pF 5% 100V both 0160-5422 cap 0.047pF 20% 50V...
  • Page 79 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 0683-1025 res 1K 5% 1/4W both 0683-2735 res 27K 5% 1/4W both 0686-5125 res 5.1K 1/2W both 0683-2015 res 200 5% 1/4W 6033A 0683-3355 res 3.3M 5% 1/4W...
  • Page 80 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 0683-1045 res 100K 5% 1/4W both 0698-8816 res 2.15 1% 1/8W both 0757-0199 res 21.5K 1% 1/8W 6033A 0699-0059 res 5K 0.1% 1/8W 6038A 0698-6360 res 10K 0.1% 1/8W...
  • Page 81 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 0683-5125 res 5.1K 5% 1/4W both 0683-2735 res 27K 5% 1/4W both 0683-1035 res 10K 5% 1/4W R100,101 both 1810-0365 network sip 2.2K X5 R102,103...
  • Page 82 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description R156-158 6038A 0683-1005 res 10 5% 1/4W both 3101-2097 switch 6-lA slide both 1826-0493 IC op amp Lo-bias Hi-impedance both 1826-0346 IC op amp dual general purpose...
  • Page 83 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 2100-1775 trimmer 5K top adjust both 0683-1015 res 100 5% 1/4W R61,62 both 1810-0272 network sip 330 X9 both 1810-1231 network smd 100 X8 S2-5...
  • Page 84 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 0683-4705 res 47 5% 1/4W both 0683-1045 res 100K 5% 1/4W both 0811-1857 res 400 5% 5W both 0698-3601 res 10 5% 2W both 0683-3915...
  • Page 85 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description A4 Mechanical both 1205-0919 heatsink (Q3,4) both 5060-2942 heatsink (Q7) both 06023-20001 heatsink (CR7) both 1531-0309 clevis, tapped both 5063-3463 HP-IB/PSI Board both 0160-5422 cap 0.047µF 20% 50V...
  • Page 86 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description J1,2 both 1251-7330 telephone jacks both 1200-0485 right angle socket both 1252-0268 HP-IB connector both 1251-4926 connector 8-contact both 1251-4927 connector 16-contact J7,8 both 1251-8417 connector 16-contact...
  • Page 87 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description R55,58 both 2100-3732 trimmer 500, top adjust R59,60 both 0698-3558 res 4.02K 1% 1/8W both 2100-3732 trimmer 500, top adjust R62-64 both 0698-3558 res 4.02K 1% 1/8W...
  • Page 88 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 1820-6789 IC 75176B RS485 driver both 1990-1387 IC opto-isolator both 1826-0536 IC LM340AK-5 voltage regulator 5V both 5080-2625 IC GAL programmed both 5080-2158 IC GAL programmed...
  • Page 89 Table 5-3. Replaceable Parts List (continued) Ref. Desig. HP Model HP Part Number Description both 5041-0309 plain key cap (4) both 5041-2089 lettered key cap (LCL) both 7120-1254 LOGO both 4040-1954 display window both 06023-00020 cover, top both 06023-00022 cover, bottom...

  • Page 91: Component Location And Circuit Diagrams

    Component Location and Circuit Diagrams This chapter contains component location diagrams, schematics, and other drawings useful for maintenance of the power supply. Included in this section are: Component location illustrations (Figures 6-1 through 6-6), showing the physical location and reference designators of almost all electrical parts.
  • Page 92 Table 6-1. Schematic Diagram Notes (continued) 10. For single in-line resistor packages, pin 1 is marked with a dot. For integrated circuit packages, pin 1 is either marked with a dot, or pin 1 is to the left (as viewed from top) of indentation on the integrated circuit package (except for A8U6 and A8U8).
  • Page 93 Figure 6-1. Top View, Top Covers Removed...
  • Page 94 Figure 6-2. Main Board (A1) Component Location...
  • Page 95 Figure 6-3. Control Board (A2) Component Location...
  • Page 96 Figure 6-4. Front Panel Board (A3) Component Location...
  • Page 97 Figure 6-5. Power Mesh Board (A4) Component Location...
  • Page 98 Figure 6-6. HP-IB Board (A8) Component Location...

  • Page 99: L00 Vac Input Power Option 100

    Description Option 100 is a modification of HP 6033A/6038A power supplies that involves changing a resistor in the A2 OVP circuit, recalibrating the supply, and changing the Front Panel. These changes allow the units to operate at a lower line voltage of 87 to 106 Vac, while operating on the same line frequency of 48 to 63 Hz.
  • Page 100 On Page 17, in Voltage Monitor and Remote Readback Full Scale Calibration step c, change 5.000625V to 4.250625V ±100µV (6033A). change 5.000625V to 4.168125V ±80µV (6038A). On Page 17, in Voltage Monitor and Remote Readback Full Scale Calibration step f, change 20V and 20.005V to 17.000 and 17.005V (6033A).

  • Page 101: Chapter 3 Manual Changes

    On Page 26, in Current Programming and Readback Accuracy steps c and g, change 20V to 17V (6033A). change 60V to 50V (6038A). On Page 27 in Load Effect (Load Regulation) steps c, change 10A to 9A (6033A). On Page 27 in Load Effect (Load Regulation) steps d, change 20V to 17V (6033A).

  • Page 102: Chapter 5 And 6 Manual Changes

    A2 board from 06038-60023 to 06038-60024 (6038A). On Page 80, change R78 from 475 to 1.43K, HP P/N 0698-3225 (6033A). change R78 from 787 to 1.96K, HP P/N 0698-0083 (6038A). Make these same changes on the schematic diagram, Figure 6-7.

  • Page 103: Blank Front Panel Option 001

    You can also send an STS? query (or SCPI equivalent) in a looping program and monitor when the power supply status changes to CC mode. Under the Performance Tests section, any references to front panel control will have to be accomplished using HP-IB commands. Use the following guidelines: To set the voltage and current to specific values, use the VSET and ISET (or SCPI equivalent) commands.

  • Page 104: Chapter 3 Manual Changes

    Chapter 3 Manual Changes: Replace Figure 3-1 with the figure on the next page. SA Tables 3-5 through 3-7 do not apply to Option 001 units. Chapter 5 and 6 Manual Changes: On Page 83 under A3 Front Panel Board, the only part that applies to the Option 001 unit is R59, the OVP-adjust potentiometer.
  • Page 105 Figure 3-1. Troubleshooting Isolation (option 001)
  • Page 107 HP 6033A Test Record Performance Test Record - HP 6033A POWER SUPPLY (Page 1 of 2) Test Facility: __________________________________________ Report No.__________________________________________ __________________________________________ Date_______________________________________________ __________________________________________ Customer___________________________________________ __________________________________________ Tested By___________________________________________ Model HP 6033A Ambient Temperature _______________________________°C Serial No.__________________________________ Relative Humidity ___________________________________% Options ___________________________________...
  • Page 108 Performance Test Record - HP 6033A POWER SUPPLY (Page 2 of 2) Report No.______________ Date_____________________ MODEL HP 6033A Page Test Description Minimum Spec. Results Maximum Measurement Spec. Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage (0.100V) 0.091 ________V 0.109...
  • Page 109 HP 6038A Test Record Performance Test Record - HP 6038A POWER SUPPLY (Page 1 of 2) Test Facility: __________________________________________ Report No.__________________________________________ __________________________________________ Date_______________________________________________ __________________________________________ Customer___________________________________________ __________________________________________ Tested By___________________________________________ Model HP 6038A Ambient Temperature _______________________________°C Serial No.__________________________________ Relative Humidity ___________________________________% Options ___________________________________...
  • Page 110 Performance Test Record - HP 6038A POWER SUPPLY (Page 2 of 2) Report No.______________ Date_____________________ MODEL HP 6038A Page Test Description Minimum Spec. Results Maximum Measurement Spec. Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage (0.090V) 0.050 ________V 0.130...
  • Page 111 PFET, p/n 1855-0547. | 3506A | 07952-08561 | 1, 2 CHANGE 3: | 3649A | 08562-08881 | 1 Under A8 HP-IB Board, change U33 to p/n 1820-0430. | US3649 | 0101-0230 | 1 CHANGE 4: 6038A Under A8 HP-IB Board, change U14 to p/n 1820-6721.

This manual is also suitable for:

6038a series

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