Keysight U3606B Service Manual
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Keysight U3606B Service Manual

Multimeter | dc power supply
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Summary of Contents for Keysight U3606B

  • Page 1 Keysight U3606B Multimeter | DC Power Supply Service Guide...
  • Page 2 Declaration of Conformity. FAR and the DFARS and are set forth specifically in writing elsewhere in the WARNING EULA. Keysight shall be under no obligation to update, revise or A WARNING notice denotes a hazard. otherwise modify the Software. With...

  • Page 3: Safety Symbols

    Warning or Caution information) Earth (ground) terminal Out position of a bi-stable push control Frame or chassis terminal In position of a bi-stable push control Category II 300 V over voltage CAT II protection 300 V Keysight U3606B Service Guide...

  • Page 4: Safety Considerations

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

  • Page 5: Environmental Conditions

    – Up to 95% RH at 40 °C (non-condensing) Altitude Up to 2000 m Pollution degree The U3606B complies with the following safety and EMC compliances: NOTE Safety compliance – IEC 61010-1:2001/EN 61010-1:2001 (2nd Edition) – Canada: CAN/CSA-C22.2 No. 61010-1-04 –...

  • Page 6: Regulatory Markings

    The CSA mark is a registered substance elements are expected to trademark of the Canadian Standards leak or deteriorate during normal use. Association. Forty years is the expected useful life of the product. Keysight U3606B Service Guide...

  • Page 7: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec

    To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information. Sales and Technical Support To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/clampmeter (product-specific information and support, software and documentation updates) –...
  • Page 8 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U3606B Service Guide...

  • Page 9: Table Of Contents

    Zero offset verification test ....... .40 Keysight U3606B Service Guide...
  • Page 10 ......110 Electrostatic Discharge (ESD) Precautions ..... 112 Keysight U3606B Service Guide...
  • Page 11 Repackaging for Shipment ........122 Keysight U3606B Service Guide...
  • Page 12 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U3606B Service Guide...
  • Page 13 Graph of load transient response time for S1 range . .55 Figure 1-18 SECUR pads location ......70 Keysight U3606B Service Guide...
  • Page 14 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U3606B Service Guide...
  • Page 15 .....82 Table 1-27 Resistance gain adjustment .....84 Keysight U3606B Service Guide...
  • Page 16 ..... . . 102 Table 2-1 List of replaceable parts ..... . 120 Keysight U3606B Service Guide...
  • Page 17 Keysight U3606B Multimeter | DC Power Supply Service Guide Calibration Procedures Calibration Overview Recommended Test Equipment Test Considerations Input and Output Connections Zero Offset (Short) Verification Test Setup Gain Verification Test Setup Output Verification Test Setup Performance Verification Tests Overview...

  • Page 18: Calibration Procedures

    Calibration Procedures Calibration Overview This manual contains procedures to verify the performance of the U3606B and to perform adjustments (calibration) where necessary. – The performance verification tests allow you to verify that the instrument is operating within its published specifications.

  • Page 19: Adjustment Is Recommended

    Adjustment is recommended Specifications are only guaranteed within the period stated from the last adjustment. Keysight recommends that re-adjustment should be performed during the calibration process for best performance. This will ensure that the instrument will remain within the specifications for the next calibration interval.

  • Page 20: Recommended Test Equipment

    8½ digit resolution readback Digital multimeter Keysight 3458A 8½ digit resolution Constant voltage load effect (load – Voltage range: 30 Vdc regulation) Electronic load Keysight 6060B – Current range: 5 A – Open and short switches Keysight U3606B Service Guide...
  • Page 21 – AC coupling – Amplifier × 10 Constant voltage RMS noise 50 Ω feed-thru Pomona 4119-50 termination 30 Ω (30 W), 2.67 Ω (24 W), 300 Ω (3 W), Fixed resistor and 0.33 Ω (3 W) Keysight U3606B Service Guide...
  • Page 22 Constant current source effect – Voltage range: 30 Vdc (line regulation) Electronic load Keysight 6060B – Current range: 5 A – Open and short switches AC voltage source Keysight 6813B Capable of supplying 90 Vac to 250 Vac Keysight U3606B Service Guide...

  • Page 23: General Measurement Techniques

    The impedance of the load leads can easily be several orders of magnitude greater than the instrument impedance and thus invalidate the measurement. To avoid mutual coupling effects, each measuring device must be connected directly to the output terminals by using a separate pair of leads. Keysight U3606B Service Guide...

  • Page 24: Using An Electronic Load

    Connect the current monitoring leads inside the load-lead connections directly at the monitoring points on the resistor element. Keysight U3606B Service Guide...

  • Page 25: Test Considerations

    “0” output is correct. You will need to set the offset for each range of the measuring function being verified. [1] A 120-minute warm-up period is required for instrument adjustments (calibration). Keysight U3606B Service Guide...

  • Page 26: Input And Output Connections

    Shielded, twisted-pair PTFE interconnecting cables of minimum length are recommended between the calibrator and the U3606B. Cable shields should be earth ground referenced. This configuration is recommended for optimal noises and settling time performance during calibration.

  • Page 27: Zero Offset (Short) Verification Test Setup

    For DC voltage, DC current 2-wire resistance, and capacitance For 4-wire resistance Connect the Connect a 4-wire short (copper) shorting plug – across the FORCE to the terminals and SENSE terminals terminals. [a] Open, by removing the shorting plug. Keysight U3606B Service Guide...

  • Page 28: Gain Verification Test Setup

    Calibration Procedures Gain Verification Test Setup Figure 1-2 Test setup for DC voltage and AC voltage gain verification Calibrator Keysight U3606B Service Guide...

  • Page 29: Figure 1-3 Test Setup For Capacitance Gain Verification

    Calibration Procedures Figure 1-3 Test setup for capacitance gain verification For test values ≥ 110 nF (2-wire compensation enabled) Calibrator For test values < 110 nF (compensation d isabled) Calibrator Keysight U3606B Service Guide...

  • Page 30: Figure 1-4 Test Setup For 2-Wire Resistance Gain Verification

    Calibration Procedures Figure 1-4 Test setup for 2-wire resistance gain verification For test values < 110 kΩ (2-wire compensation enabled) Calibrator For test values ≥ 110 kΩ (compensation d isabled) Calibrator Keysight U3606B Service Guide...

  • Page 31: Figure 1-5 Test Setup For 4-Wire Resistance Gain Verification

    Calibration Procedures Figure 1-5 Test setup for 4-wire resistance gain verification Calibrator Figure 1-6 Test setup for DC current and AC current gain verification Calibrator Keysight U3606B Service Guide...

  • Page 32: Figure 1-7 Test Setup For Frequency Voltage Gain Verification

    Calibration Procedures Figure 1-7 Test setup for frequency voltage gain verification Calibrator Figure 1-8 Test setup for frequency current gain verification Calibrator Keysight U3606B Service Guide...

  • Page 33: Figure 1-9 Test Setup For Diode Voltage Gain Verification

    Calibration Procedures Figure 1-9 Test setup for diode voltage gain verification Calibrator Keysight U3606B Service Guide...

  • Page 34: Output Verification Test Setup

    Calibration Procedures Output Verification Test Setup Figure 1-10 Test setup for constant voltage programming and readback accuracy verification Digital multimeter Figure 1-11 Test setup for constant voltage load and line regulation verification LOAD Digital multimeter Electronic load Keysight U3606B Service Guide...

  • Page 35: Figure 1-12 Test Setup For Constant Voltage Noise Effect (Peak-To-Peak And Rms Noise) Verification

    Test setup for constant voltage noise effect (peak-to-peak and RMS noise) verification Fixed resistor Differential amplifier – V out – V Oscilloscope Ω termination Ω termination RMS voltmeter Figure 1-13 Test setup for load transient response time verification Oscilloscope LOAD Electronic load Keysight U3606B Service Guide...

  • Page 36: Figure 1-14 Test Setup For Constant Current Programming And Readback Accuracy Verification

    Figure 1-14 Test setup for constant current programming and readback accuracy verification Current monitoring resistor Digital multimeter Figure 1-15 Test setup for constant current load and line regulation verification Electronic Current monitoring resistor LOAD load Digital multimeter Keysight U3606B Service Guide...

  • Page 37: Figure 1-16 Test Setup For Constant Current Rms Noise Effect

    Calibration Procedures Figure 1-16 Test setup for constant current RMS noise effect verification Fixed AC/DC converter resistor TCP305 TCPA300 Differential amplifier – V out –V Ω termination RMS voltmeter Keysight U3606B Service Guide...

  • Page 38: Performance Verification Tests Overview

    Use the verification and performance tests to verify the measurement performance of the instrument. The verification and performance tests use the specifications of the instrument listed in Chapter 5 of the U3606B User’s Guide, “Characteristics and Specifications,” starting on page 155.

  • Page 39: Self-Tests

    (see the U3606B Programmer’s Reference). A list of the possible self-test errors is given in Chapter 6 of the U3606B User’s Guide, “List of Error Messages,” starting on page 181. If repair is required, contact the nearest Keysight Service Center.

  • Page 40: Performance Verification Tests

    The resistance measurements uses the Null math function (the null reading is NOTE taken with the test leads connected together) to eliminate the test lead resistance. See Chapter 2 of the U3606B User’s Guide, “Null,” starting on page 63 for more information on the Null math function. Keysight U3606B Service Guide...
  • Page 41 1000 Ω ±0.3 Ω Zero offset calibration using a multifunction calibrator is NOT recommended. CAUTION The calibrator and cabling offset can be large and unstable causing poor offset calibration of the Keysight U3606B or any multimeter. Keysight U3606B Service Guide...

  • Page 42: Gain Verification Test

    3 Select each range in the order shown below. Provide the indicated input voltage. Compare the measurement results to the appropriate test limits in Table 1-3. (Be certain to allow for appropriate source settling when using the Fluke 5520A.) Keysight U3606B Service Guide...
  • Page 43 (be certain to allow for appropriate source settling when using the Fluke 5520A). Table 1-4 DC current gain verification test Input current Range Error from nominal 1-year 10 mA 10 mA ±0.0065 mA 100 mA 100 mA ±0.055 mA ±0.00157 A 2.9 A ±0.00456 A Keysight U3606B Service Guide...
  • Page 44 1 kHz 100 V ±0.3 V 100 V 1 kHz 750 V ±0.95 V 750 V 1 kHz 750 V ±2.25 V Set the calibrator output to 0 V before disconnecting from the instrument CAUTION input terminals. Keysight U3606B Service Guide...
  • Page 45 3 Select each range in the order shown below. Provide the indicated input resistance. Compare the measurement results to the appropriate test limits in Table 1-7 (be certain to allow for appropriate source settling when using the Fluke 5520A). Keysight U3606B Service Guide...
  • Page 46 10 range, please perform calibrator zeroing before testing the 1 Ω Ω NOTE resistance values of the device-under-test (DUT) to ensure that the 5520A is maintained with a zero cal. every 12 hours ± 1 Keysight U3606B Service Guide...
  • Page 47 1 Connect the calibrator to the front panel I (red) and LO (black) input terminals (see Figure 1-8, “Test setup for frequency current gain verification,” page 32). 2 Press [Hz ms %] to select the frequency function. Keysight U3606B Service Guide...

  • Page 48: Output Verification Test

    You should consider programming the U3606B over the remote interface for this NOTE test to avoid round off errors. See the U3606B Programmer’s Reference for more information on remote interface programming. Keysight U3606B Service Guide...
  • Page 49 1 Turn off the instrument and connect a digital multimeter between the front panel (red) and (black) output terminals (see Figure 1-11, “Test setup for constant voltage load and line regulation verification,” on page 34). 2 Turn on the instrument. Press [Voltage] to select the constant voltage mode. Keysight U3606B Service Guide...
  • Page 50 5 Operate the electronic load in constant current (CC) mode, and set its current (1 A for S1, 3 A for S2, or 3 A for S2m). Ensure that the U3606B is operating within the specified limit and protection values. If not, adjust the electronic load by increasing the resistance so that the current drops slightly until the U3606B is operating in the constant voltage mode.
  • Page 51 6 Operate the electronic load in constant current (CC) mode, and set its current (1 A for S1, 3 A for S2, or 3 A for S2m). Ensure that the U3606B is operating within the specified limit and protection values. If not, adjust the electronic load by increasing the resistance so that the current drops slightly until the U3606B is operating in the constant voltage mode.
  • Page 52 Set the attenuation to 1. e Set the low-pass filter to 20 MHz bandwidth limit to filter out input signals containing higher frequencies. Set to the zero precision voltage generator. g Set the input impedance to 1 ΜΩ. Keysight U3606B Service Guide...
  • Page 53 Divide the value by 10 to get the constant voltage RMS noise measurement. 12 Repeat step 3 step 11 for the S2 (8 V/3 A) and S2m (1000 mV /3 A) ranges. All the result should not exceed 0.002 V as shown in Table 1-16. Keysight U3606B Service Guide...
  • Page 54 S2 (8 V/3 A) and S2m (1000 mV/3 A) ranges. All the transient response time result should less than 100 μs for the output to recover to within 15 mV as shown in Table 1-17. Keysight U3606B Service Guide...

  • Page 55: Figure 1-17 Graph Of Load Transient Response Time For S1 Range

    Output vol tage Range (parameter) Error from nominal 1-year 30 V S1 (30 V) <100 μs S2 (8 V) <100 μs S2m (1000 mV) <100 μs Figure 1-17 Graph of load transient response time for S1 range Keysight U3606B Service Guide...
  • Page 56 Constant current programming and readback accuracy verification test Output current Range (parameter) Error from nominal 1-year ±0.003 A S1 (1 A) ±0.0045 A ±0.003 A S2 (3 A) ±0.0075 A ±0.00015 A S1m (100 mA) 0.1 A ±0.0002 A Keysight U3606B Service Guide...
  • Page 57 U3606B is the constant current (CC) mode. For the S1m range, operate the electronic load in constant resistance mode, and set its resistance to 300 Ω. Ensure that the U3606B is operating within the specified limit and protection values. If not, adjust the electronic load by reducing the resistance so that the voltage drops slightly until the U3606B is operating within the specified limit and protection values.
  • Page 58 U3606B is the constant current (CC) mode. For the S1m range, operate the electronic load in constant resistance mode, and set its resistance to 300 Ω. Ensure that the U3606B is operating within the specified limit and protection values. If not, adjust the electronic load by reducing the resistance so that the voltage drops slightly until the U3606B is operating within the specified limit and protection values.
  • Page 59 This test measures the RMS output current in the frequency range from 20 Hz to 20 MHz with the U3606B operating in the constant current (CC) mode. 1 Turn off the instrument and connect a fixed resistor (30 Ω for S1 range, 2.67 Ω...
  • Page 60 RMS noise measurement. 10 Repeat the step 5 step 9 for the S2 (8 V/3 A) and S1m (100 mA/30 V) ranges. All the results should not exceed 0.001 A as shown in Table 1-21. Keysight U3606B Service Guide...
  • Page 61 Range (parameter) Error from nominal 1-year ±0.001 A 1 A with 30 Ω S1 (1 A) ±0.001 A 3 A with 2.67 Ω S2 (3 A) ±0.001 A 0.1 A with 300 Ω S1m (100 mA) Keysight U3606B Service Guide...

  • Page 62: Additional Verification Tests

    Optional capacitance gain verification test Input capacitance Range Error from nominal 1-year 1 nF 1 nF ±0.028 nF 10 nF 10 nF ±0.15 nF 100 nF 100 nF ±1.5 nF 1 μF 1 μF ±15 nF Keysight U3606B Service Guide...
  • Page 63 Table 1-22 Optional capacitance gain verification test (continued) Input capacitance Range Error from nominal 1-year 10 μF 10 μF ±0.15 μF 100μF 100μF ±1.5 μF 1000 μF 1000 μF ±15 μF 10000 μF 10000 μF ±250 μF Keysight U3606B Service Guide...

  • Page 64: Calibration Process

    99. Ensure that the instrument has quit the adjustment mode and is turned off. 7 Record the new security code and calibration count in the instrument's maintenance records. Ensure that you quit the adjustment mode before powering off the U3606B. NOTE Keysight U3606B Service Guide...

  • Page 65: Calibration Security

    Instrument Preset (SYSTem:PRESet command). The security code may contain up to 12 alphanumeric characters. The first character must be a letter. The remaining characters can be letters or numbers. You do not have to use all 12 characters. Keysight U3606B Service Guide...

  • Page 66: Unsecuring The Instrument For Calibration

    “AB123CD45” from the remote interface. The first three characters (AB1) are ignored. The numerals “2” and “3” are still used, and the letters “C” and “D” are represented by zeros. Use this code to unsecure: 2300 Keysight U3606B Service Guide...
  • Page 67 If the incorrect security code is entered, If the correct security code is entered, displayed for 3 seconds before you return to the displayed for 3 seconds before you enter the Calibration Security Code menu. Adjustment mode. Keysight U3606B Service Guide...

  • Page 68: Unsecuring The Instrument From The Remote Interface

    This command changes the security code to CAL:SEC:CODE ABC1234 “ABC1234”. This command secures the instrument from CAL:SEC:CODE ON, ABC1234 accidental or unauthorized adjustments. See the CALIbration subsystem in the U3606B Programmer’s Reference for more information on the CALibration:SECurity:CODE command. Keysight U3606B Service Guide...

  • Page 69: Resetting The Security Code To The Factory Default

    3 Solder a temporary short between the two exposed metal pads on the main printed circuit (PC) board assembly. The general location is shown in Figure 1-18. On the U3606B PC board, the pads are marked as “SECUR”. Keysight U3606B Service Guide...

  • Page 70: Figure 1-18 Secur Pads Location

    5 The display will show the message “CALib”. The instrument is now unsecured. (The security code resets to the factory default value.) 6 Turn off the instrument and remove the power cord. 7 Remove the temporary short installed in step 8 Reassemble the instrument. Keysight U3606B Service Guide...
  • Page 71 10 You can now enter a new security code if you wish. See “Changing the calibration security code” on page 68. Be sure you record the new security code. Never calibrate the instrument while the case is open. Reassemble the CAUTION instrument before performing any calibration procedures. Keysight U3606B Service Guide...

  • Page 72: Using The Front Panel For Adjustments

    This section describes the procedures to perform adjustments from the front panel. To unsecure the instrument, see “Unsecuring the Instrument for Calibration” page 66. Once unsecured, “CALib” is displayed on the lower secondary display to indicate that the instrument is now in Adjustment mode. Keysight U3606B Service Guide...

  • Page 73: Adjustment Considerations

    It is recommended to wait for 1 minute before you begin the calibration after connecting the test leads. Never turn off the instrument during an adjustment. This may delete the CAUTION calibration memory for the present function. Keysight U3606B Service Guide...

  • Page 74: Aborting A Calibration In Progress

    705, "Cal:Aborted". You may also generate errors 742 through 748. If this occurs, you should not use the instrument until a complete re-adjustment has been performed. A list of the possible calibration errors is given on page 102. Keysight U3606B Service Guide...

  • Page 75: Adjustments Procedures

    V (red) and LO (black) front panel input terminals. Leave the current input I (red) open. To minimize thermal effects, wait at least 1 minute after connecting the shorting NOTE plug before executing the zero offset adjustment. Keysight U3606B Service Guide...

  • Page 76: Gain Adjustments

    Most measuring functions and ranges have gain adjustment procedures. The NOTE 100 MΩ range does not have gain calibration procedures. Adjustments for each function should be performed ONLY in the order shown. Keysight U3606B Service Guide...
  • Page 77 (frequency as 0.9 to 1.1 × full scale page 80 – 10 V 1 kHz) – 100 V – 750 V Input ≥ 100 mV , 900 Hz to 1100 Hz Frequency Autorange/1 kHz page 82 Keysight U3606B Service Guide...
  • Page 78 DC voltage gain adjustment procedure 1 Press [ ] to enter the DC voltage gain calibration. 2 The display shows the uncalibrated value and the reference value of the adjustment item. 3 Configure each adjustment item shown in Table 1-24. Keysight U3606B Service Guide...
  • Page 79 Table 1-24 DC voltage gain adjustment Ad justment item Input vol tage Dual banana plug with copper wire short between the two Short input terminals 100.000 mV 100 mV 1.00000 V +1 V –1.00000 V –1 V Keysight U3606B Service Guide...
  • Page 80 5 Apply the input signal shown in the “Input” column of Table 1-25. Always complete tests in the same order as shown in Table 1-25. NOTE 6 Enter the actual applied input. Keysight U3606B Service Guide...
  • Page 81 10.0000 V, 1 kHz 10 V 1 kHz 100.000 V, 1 kHz 100 V 1 kHz 750.00 V, 1 kHz 750 V 1 kHz Set the calibrator output to 0 V before disconnecting from the instrument CAUTION input terminals. Keysight U3606B Service Guide...
  • Page 82 9 Verify the frequency gain adjustments using the “Frequency voltage gain verification test” on page 47. Table 1-26 Frequency gain adjustment Input vol tage (V Ad justment item Input frequency 1000.00 Hz, 1 V 1 kHz Keysight U3606B Service Guide...
  • Page 83 – An adjustment failure is indicated by a long beep, the display showing FAiL along with a calibration error number. Correct the problem and repeat this procedure. 8 Repeat step 3 through step 7 for each gain adjustment point shown in Table 1-27. Keysight U3606B Service Guide...
  • Page 84 If the zero offset adjustment procedure has been recently performed prior to the NOTE DC current gain calibration procedure, the adjustment item “OPEn” can be omitted. 4 Use to select the adjustment item. 5 Apply the input signal shown in the “Input” column of Table 1-28. Keysight U3606B Service Guide...
  • Page 85 DC current gain adjustment Ad justment item Input current Input terminals open (remove any test leads or shorting OPEn plugs from the input terminals) 10.0000 mA 10 mA 100.000 mA 100 mA 1000.00 mA 1000 mA Keysight U3606B Service Guide...
  • Page 86 Correct the problem and repeat this procedure. 8 Repeat step 3 through step 7 for each gain adjustment point shown in Table 1-29. 9 Verify the AC current gain adjustments using the “AC current verification test” on page 45. Keysight U3606B Service Guide...
  • Page 87 5 Apply the input signal shown in the “Input” column of Table 1-30. Always complete tests in the same order as shown in Table 1-30. NOTE 6 Enter the actual applied input. Keysight U3606B Service Guide...
  • Page 88 0.400 nF 0.4 nF 1.000 nF 1 nF 10.00 nF 10 nF 100.0 nF 100 nF 1.000 μF 1 μF 10.00 μF 10 μF 100.0 μF 100 μF 1000 μF 1000 μF 10000 μF 10000 μF Keysight U3606B Service Guide...

  • Page 89: Output Adjustments

    Output adjustments The instrument calculates and stores output corrections for each output level. The U3606B implements a closed loop output calibration procedure to its inherent dual function ability as a digital multimeter and a DC power supply. The output constant is computed from the calibration level set for the calibration command and from measurements made automatically during the adjustment procedure.
  • Page 90 3 The display shows the uncalibrated value and the reference value of the adjustment item. 4 Configure each adjustment item shown in Table 1-32. 5 Use to select the adjustment item. Always complete tests in the same order as shown in Table 1-32. NOTE Keysight U3606B Service Guide...
  • Page 91 (black) terminal and LO (black) terminal connected. Fixed resistor 8 Verify the constant current adjustments using the “CC programming and readback accuracy” on page 56. Table 1-32 Constant current output adjustment Ad justment item Output current OUt-L AUTO calibration OUt-H AUTO calibration Keysight U3606B Service Guide...
  • Page 92 2 Turn on the instrument. Press [Voltage] to enter the constant voltage output calibration. 3 The display shows the uncalibrated value and the reference value of the adjustment item. 4 Configure each adjustment item shown in Table 1-33. Keysight U3606B Service Guide...
  • Page 93 (red) and (black) output terminals according to the fixed resistors value on Table 1-33. Leave the connections from the output terminals ( ) to the input terminals (V and LO) intact. Keysight U3606B Service Guide...
  • Page 94 8 V with additional 300 Ω (3 W) fixed resistor LOAd3 1000 mV with additional 0.33 Ω (3 W) fixed resistor LOAd4 [a] See step 7 for information on how to connect the LOAd adjustment item. [b] S2 range with a lighter load. Keysight U3606B Service Guide...
  • Page 95 Ensure that the rear panel sense terminals (+S and –S) are shorted to the rear NOTE panel output (+ and –) terminals. See Chapter 3 of the U3606B User’s Guide, “Remote sensing connections,” starting on page 116 for more information on how to connect the load leads.
  • Page 96 Do not remove the short bar between the rear panel sense terminals (+S and –S) NOTE are the rear panel output (+ and –) terminals. See Chapter 3 of the U3606B User’s Guide, “Remote sensing connections,” starting on page 116 for more information on how to connect the load leads.
  • Page 97 Ensure that the rear panel sense terminals (+S and –S) are shorted to the rear NOTE panel output (+ and –) terminals. See Chapter 3 of the U3606B User’s Guide, “Remote sensing connections,” starting on page 116 for more information on how to connect the load leads.
  • Page 98 Do not remove the short bar between the rear panel sense terminals (+S and –S) NOTE are the rear panel output (+ and –) terminals. See Chapter 3 of the U3606B User’s Guide, “Remote sensing connections,” starting on page 116 for more information on how to connect the load leads.

  • Page 99: Finishing The Adjustments

    3 Record the new calibration count (“Calibration Count” on page 100). 4 Press [Shift] > [Exit] or [Shift] + [ ] to exit the adjustment mode. 5 The instrument will be secured and returns to normal operation. Keysight U3606B Service Guide...

  • Page 100: Calibration Count

    1 In adjustment mode, press [MinMax] to view the calibration count. 2 Take note of the calibration count to keep track of the number of calibrations that have been performed. 3 The instrument will return to the calibration operation after a few seconds of inactivity. Keysight U3606B Service Guide...

  • Page 101: Calibration Message

    November 2013, by AT." This query returns the message currently stored in CAL:STR? calibration memory (the quotes are also returned). "LAST CAL: 27 November 2013, by AT." See the U3606B Programmer’s Reference for more information on the CALibration subsystem. Keysight U3606B Service Guide...

  • Page 102: Calibration Error Codes

    Cal RES open out of range Cal checksum failed, DCV corrections Cal checksum failed, DCI corrections Cal checksum failed, RES corrections Cal checksum failed, ACV corrections Cal checksum failed, ACI corrections Cal checksum failed, FREQ correction Cal checksum failed, CAP corrections Keysight U3606B Service Guide...
  • Page 103 Calibration Procedures Table 1-34 List of calibration errors (continued) Error code Error message Source board failed on reading Source board failed on sense Keysight U3606B Service Guide...
  • Page 104 Calibration Procedures THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U3606B Service Guide...
  • Page 105 Keysight U3606B Multimeter | DC Power Supply Service Guide Service and Maintenance Operating Checklist Cleaning Fuse Replacement Electrostatic Discharge (ESD) Precautions Mechanical Disassembly Replaceable Parts Types of Services Available Repackaging for Shipment This chapter will help you troubleshoot a failing instrument. It also describes how...

  • Page 106: Service And Maintenance

    Service and Maintenance Operating Checklist Before returning your instrument to Keysight for service or repair, do a check on the following items: Is the instrument inoperative? 1 Verify that the power cord is connected to the instrument and to the AC line power.

  • Page 107: Cleaning

    3 Wipe the case with a damp cloth and mild detergent — do not use abrasives or solvents. Wipe the contacts in each terminal with a clean cotton swab moistened with alcohol. Keysight U3606B Service Guide...

  • Page 108: Fuse Replacement

    Fuse Replacement To replace the power line fuse The power line fuse is located within the U3606B fuse-holder assembly on the rear panel. The U3606B is shipped from the factory with a power-line fuse installed. The supplied fuse is a time-lag, low-breaking, 2 A/250 V, S/B 5×20 mm fuse, Keysight part number A02-62-25026-2U.
  • Page 109 Service and Maintenance New fuse 4 Re-insert the fuse holder assembly into the rear panel. Keysight U3606B Service Guide...

  • Page 110: To Replace The Current Input Fuse

    The fuse is a 3.15 A/500 V F/B 6.3×32 mm fuse, Keysight part number A02-62-25657-1U. If you are certain that the fuse is faulty, replace it with one of the same size and rating.
  • Page 111 3 Remove the faulty current input fuse and replace a new current input fuse into the fuse holder assembly. 4 Re-insert the fuse holder assembly into the front panel. Turn the screwdriver clockwise to fasten the fuse holder assembly in place. Keysight U3606B Service Guide...

  • Page 112: Electrostatic Discharge (Esd) Precautions

    – Use a conductive wrist strap to reduce static charge accumulation. – Minimize handling. – Keep replacement parts in original static-free packaging. – Remove all plastic, foam, vinyl, paper, and other static-generating materials from the immediate work area. – Use only anti-static solder suckers. Keysight U3606B Service Guide...

  • Page 113: Mechanical Disassembly

    General disassembly 1 Turn off the power. Remove all cables from the instrument. 2 Remove the carry handle. Rotate the handle upright and pull out from the sides of the instrument. Keysight U3606B Service Guide...
  • Page 114 4 Remove the rear bezel. Loosen the two captive screws in the rear bezel with a T10 Torx driver and remove the rear bezel. 5 Remove the cover. Remove the screws in the bottom of the cover with a T20 Torx driver. Keysight U3606B Service Guide...
  • Page 115 7 Remove the push rod and d isconnect the d isplay cable. a Turn the instrument over and gently move the power switch push rod towards the front of the instrument to disengage it from the switch. Be careful not to twist or bend the push rod. Keysight U3606B Service Guide...
  • Page 116 Service and Maintenance b Disconnect the two ribbon cable connectors from the front panel. c Disconnect the individual wires (label 1 to 5) from the top layer circuit board as shown below. Keysight U3606B Service Guide...
  • Page 117 T20 Torx driver and remove the top layer circuit board. Remove the protective metal sheet as well. 9 Disconnect the individual wires (label 1 to 4) from the bottom layer circuit board as shown below. Keysight U3606B Service Guide...
  • Page 118 11 You can now pry the side of the front panel from the chassis and remove it. Front panel disassembly 12 Loosen the two captive screws with a Phillips (+) screwdriver and remove the keypad and display assembly. Keysight U3606B Service Guide...
  • Page 119 13 Remove the keypad and d isplay assembly. The rubber keypad and VFD display assembly can now be pulled out from the plastic housing. Plastic housing VFD display assembly Rubber keypad 14 To reassemble all the modules again, just follow the disassembly procedure in reverse order. Keysight U3606B Service Guide...

  • Page 120: Replaceable Parts

    To order replaceable parts from Keysight, do the following: 1 Contact your nearest Keysight Sales Office or Service Center. 2 Identify the parts by the Keysight part number shown in the replaceable parts list. 3 Provide the instrument model number and serial number.

  • Page 121: Types Of Services Available

    – In the United States: (800) 829-4444 – In Europe: 31 20 547 2111 – In Japan: 0120-421-345 – Or use our Web link for information on contacting Keysight worldwide: – www.keysight.com/find/assist – Or contact your Keysight Technologies representative. Before shipping your instrument, ask the Keysight Technologies Service Center to provide shipping instructions, including what components to ship.

  • Page 122: Repackaging For Shipment

    Service and Maintenance Repackaging for Shipment If the unit is to be shipped to Keysight for service or repair, be sure to: – attach a tag to the unit identifying the owner and indicating the required service or repair (include the model number and full serial number), –...
  • Page 123 This information is subject to change without notice. Always refer to the English version at the Keysight website for the latest revision. © Keysight Technologies 2013-2018 Edition 7, June 2018 Printed in Malaysia *U3606-90069* U3606-90069 www.keysight.com...

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