Agilent Technologies 34450A Service Manual
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Agilent Technologies 34450A Service Manual

5 1/2 digit multimeter
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Agilent 34450A
5½ Digit Multimeter
Service Guide
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Summary of Contents for Agilent Technologies 34450A

  • Page 1 Agilent 34450A 5½ Digit Multimeter Service Guide Agilent Technologies...

  • Page 2: Restricted Rights Legend

    34450-90029 ity and fitness for a particular purpose. age to the product or loss of impor- Agilent shall not be liable for errors or for Edition tant data. Do not proceed beyond a incidental or consequential damages in...

  • Page 3: Safety Symbols

    Caution, risk of danger (refer to this manual for specific Warning or Caution information) IEC Measurement Category II. Inputs CAT II may be connected to mains (up to 300 V 300 VAC) under Category II overvoltage conditions. 34450A Service Guide...
  • Page 4 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. 34450A Service Guide...

  • Page 5: General Safety Information

    Agilent Technologies assumes no liability for the customer’s failure to comply with these requirements. 34450A Service Guide...
  • Page 6 10 A Current Input Terminal. The 10 A cur- or socket. The 34450A may be used to make rent input terminal has a Protection Limit of measurements with the HI and LO inputs...
  • Page 7 Protection Limits defined in the following section. • If the Test Lead Set is used in a manner not specified by Agilent Technologies, the protection provided by the Test Lead Set may be impaired. Also, do not use a damaged or worn Test Lead Set.

  • Page 8: Environmental Conditions

    Altitude Operating up to 3,000 meters Pollution degree Pollution Degree 2 The Agilent 34450A 5½ Digit Multimeter complies with the following EMC and N O T E safety requirements: • IEC 61010-1:2001 / EN 61010-1:2001 (2nd Edition) • IEC 61326-2-1:2005 / EN61326-2-1:2006 •...
  • Page 9 “Monitoring and Control Instrument” product. The affixed product label is shown as below: Do not dispose in domestic household waste To return this unwanted instrument, contact your nearest Agilent office, or visit www.agilent.com/environment/product for more information.
  • Page 10 If any portion of the Test Lead Set is worn or damaged, do not use. Replace with a new Agilent 34138A Test Lead Set. If the Test Lead Set is used in a manner not specified by Agilent Technologies, the WA R N I N G protection provided by the Test Lead Set may be impaired.
  • Page 11 The Declaration of Conformity (DoC) for this instrument is available on the Web site. You can search the DoC by its product model or description. http://regulations.corporate.agilent.com/DoC/search.htm If you are unable to search for the respective DoC, please contact your N O T E local Agilent representative. 34450A Service Guide...
  • Page 12 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. 34450A Service Guide...

  • Page 13: Table Of Contents

    Table of Contents Performance Tests and Calibration Calibration Overview Closed-case calibration Agilent Technologies calibration services Calibration interval Time required for calibration Automating calibration procedures Recommended Test Equipment Test Considerations Input connections Performance Verification Tests Overview Self test Quick performance check...
  • Page 14 Types of Services Available Repackaging for Shipment Cleaning To Replace the Power Line Fuse To Replace a Current Input Fuse To Verify your Device License Self Test Errors Electrostatic Discharge (ESD) Precautions Mechanical Disassembly Replaceable Parts Rack Mounting 34450A Service Guide...
  • Page 15 Table 1-13 AC voltage gain adjustment Table 1-14 AC current gain adjustment Table 1-15 Ohms gain adjustment Table 1-16 Capacitance gain adjustment Table 1-17 Frequency gain adjustment Table 2-1 Self test error numbers Table 2-2 Replaceable parts list 34450A Service Guide...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. 34450A Service Guide...

  • Page 17: Performance Tests And Calibration

    Agilent 34450A 5½ Digit Multimeter Service Guide Performance Tests and Calibration Calibration Overview Recommended Test Equipment Test Considerations Performance Verification Tests Overview Performance Verification Tests Calibration Security Calibration Process Adjustments Calibration Message Calibration Errors This chapter contains performance test procedures and calibration procedures.

  • Page 18: Calibration Overview

    Agilent Technologies calibration services When your instrument is due for calibration, contact your local Agilent Service Center for a low- cost re- calibration. The 34450A is supported on automated calibration systems, which allow Agilent to provide this service at competitive prices.

  • Page 19: Calibration Interval

    60 minutes (see“Test Considerations” once the instrument is warmed- up on page 5). Refer to the 34450A Programmer’s Reference online help for more information. Automating calibration procedures The adjustment procedures provided in this Service Guide demonstrate front panel adjustment.

  • Page 20: Recommended Test Equipment

    A suggested alternate method would be to use the Agilent 3458A 8½ Digit Digital Multimeter to measure less accurate yet stable sources. The output value measured from the source can be entered into the instrument as the target calibration value.

  • Page 21: Test Considerations

    For DC voltage, DC current, and resistance gain verification measurements, you should ensure the calibrator's "0" output is correct. You will need to set the offset for each range of the measuring function being verified. 34450A Service Guide...

  • Page 22: Input Connections

    Shielded, twisted- pair, PTFE interconnect cables of minimum length are recommended between the calibrator and the multimeter. Cable shields should be earth ground referenced. This configuration is recommended for optimal noises and settling time performance during calibration. 34450A Service Guide...

  • Page 23: Performance Verification Tests Overview

    Use the performance verification tests to verify the measurement performance of the instrument. The performance verification tests use the instrument's specifications listed in the Agilent 34450A User's Guide, Chapter 4, Specifications. You can perform four different levels of performance verification tests: •...

  • Page 24: Quick Performance Check

    • Perform a self test as described in the preceding section. • Perform only the performance verification tests indicated in the following tables with the letter Q. If the instrument fails the quick performance check, adjustment or repair is required. 34450A Service Guide...

  • Page 25: Performance Verification Tests

    This test is used to check the zero offset performance of the instrument. Verification checks are only performed for those functions and ranges with unique offset calibration constants. Measurements are checked for each function and range as described in the procedure on the next page. 34450A Service Guide...

  • Page 26: Table 1-2 Zero Offset Verification Test

    ±0.5 µF Open 1 mF ±5 µF Open 10 mF ±0.05 mF Short DC Volts 100 mV ±8 µV Short ±50 µV Short 10 V ±0.5 mV Short 100 V ±5 mV Short 1000 V ±50 mV 34450A Service Guide...

  • Page 27: Gain Verification

    Verification checks are performed only for functions and ranges with unique gain calibration constants. DC voltage gain verification test 1 Connect the calibrator to the front panel HI and LO input terminals as shown in the figure below : 34450A Service Guide...

  • Page 28: Dc Current Gain Verification Test

    [1] Select Slow Mode 5½ digit measurement resolution Q= Quick performance verification test points DC current gain verification test 1 Connect the calibrator to the front panel HI and LO input connectors as shown in the figure below: For range ≤ 100 mA 34450A Service Guide...

  • Page 29: Table 1-4 Dc Current Gain Verification Test

    DC current ±0.57 μA 1 mA 1 mA ±6.5 μA 10 mA 10 mA ±57 μA 100 mA 100 mA Caution: Connect calibrator to multimeter’s 10 A and LO terminals before applying 1 A and 10 A 34450A Service Guide...

  • Page 30: Ohms Gain Verification Test

    1 Connect the calibrator to the front panel HI and LO input terminals as shown in the figure below: ~ 100 k Ω Ω 2- W resistance with compensation (For range 100 ~ 100 M Ω Ω 2- W resistance without compensation (For range 1 M 34450A Service Guide...

  • Page 31: Table 1-5 Ohms Gain Verification Test

    Ohms ±580 mΩ 1 kΩ 1 kΩ ±5.5 Ω 10 kΩ 10 kΩ ±55 Ω 100 kΩ 100 kΩ ±650 Ω 1 MΩ 1 MΩ ±25.5 kΩ 10 MΩ 10 MΩ ±2.005 MΩ 100 MΩ 100 MΩ 34450A Service Guide...

  • Page 32: Frequency Gain Verification Test

    Input Frequency Function Range Quick Check Error from Nominal 1 year 1 Vrms 1 kHz Frequency ±0.23 Hz 0.1 Vrms 20 Hz ±0.007 Hz [1] Select Slow Mode 5½ digit measurement resolution Q= Quick performance verification test points 34450A Service Guide...

  • Page 33: Ac Voltage Verification Test

    100 mV 1 kHz 100 mV ±0.3 mV 100 mV 100 mV 10 kHz ±1.8 mV 100 mV 100 mV 30 kHz ±3.3 mV 100 mV 100 mV 100 kHz ±11 mV 20 kHz ±3 mV 45 kHz 34450A Service Guide...
  • Page 34 ±2.25 V 750 V 750 V 45 Hz ±2.25 V 750 V 750 V 1 kHz ±2.25 V 750 V 750 V 10 kHz [1] Select Slow Mode 5½ digit measurement resolution Q= Quick performance verification test points 34450A Service Guide...

  • Page 35: Ac Current Verification Test

    Configuration: AC current (CONFigure:CURRent:AC) 1 Connect the calibrator to the front panel HI and LO input terminals as shown in the figure below: For range ≤ 100 mA For range ≥ 1 A , Input < 3A 34450A Service Guide...

  • Page 36: Table 1-8 Ac Current Verification Test

    5 kHz 100 mA ±2.2 mA 100 mA 10 kHz 100 mA ±2.2 mA Caution: Connect calibrator to multimeter’s 10 A and LO terminal before applying 1A and 10 A 20 Hz ±16 mA 45 Hz ±6 mA 34450A Service Guide...
  • Page 37 ±22 mA 10 A 45 Hz 10 A ±60 mA 10 A 1 kHz 10 A ±60 mA 5 kHz 10 A ±60 mA [1] Select Slow Mode 5½ digit measurement resolution Q= Quick performance verification test points 34450A Service Guide...

  • Page 38: Capacitance Performance Verification Test

    ± 15 µF 10 mF 10 mF ± 0.25 mF [1] For the best accuracy, take a zero null measurement with open test leads, to null out the test lead capacitance, before connecting the test leads to the calibrator. 34450A Service Guide...

  • Page 39: Calibration Security

    The security code can only be changed from the remote interface after the instrument has been unsecured. Refer to the CAL:SEC:CODE command in the 34450A Programmer's Reference Help File for more details.

  • Page 40: Unsecuring The Instrument For Calibration

    In our example, the code now becomes: 01A40 From the front panel, any letters (A in this example) are represented by 0. Use this code to unsecure: 01040 34450A Service Guide...
  • Page 41 To unsecure the instrument without a correct security code, send CAL:SEC:STAT RESET command through the remote interface. The security code is reset to factory settings (AT34450). Refer to the CAL:SEC:STAT command in the 34450A Programmer's Reference Help File for more details. 34450A Service Guide...

  • Page 42: Calibration Process

    29). 5 Secure the instrument against calibration. 6 Note the new security code and calibration count in the instrument's maintenance records. The new security code and calibration count in the instrument’s maintenance records. N O T E 34450A Service Guide...

  • Page 43: Using The Front Panel For Adjustments

    Performance Tests and Calibration Calibration Process Using the front panel for adjustments This section describes the process used to perform adjustments from the front panel. Refer to the 34450A Programmer's Reference online help for remote interface commands. Selecting the Adjustment Mode 1 Press >...
  • Page 44 Typically, upon re–applying power, the instrument will report Calibration Corrupt in the Questionable Data Register. Refer to the STAT:QUES:COND? command in the 34450A Programmer's Reference Help File for more details. If this occurs, you should not use the instrument until a complete re–adjustment has been performed.

  • Page 45: Adjustments

    • Consider the thermal effects as you are connecting test leads to the calibrator and multimeter. It is recommended to wait one minute before starting the calibration after connecting the test leads. 34450A Service Guide...

  • Page 46: Dc Voltage Gain Adjustment Procedure

    (0.1, 1) x Full Scale Frequency 1 V, 1 kHz 1 Vrms, 1 kHz DC voltage gain adjustment procedure Review the “Test Considerations” on page 5 and “Gain adjustment considerations” on page 29 sections before beginning this procedure. 34450A Service Guide...

  • Page 47: Table 1-11 Dc Voltage Gain Adjustment

    [1] Cal Item 0 mV only calibrated once during DC voltage gain adjustment procedure. You need to re-calibrate once you exit calibration mode. [2] Calibration need to be done on 1 V range first before proceeds to other ranges. 34450A Service Guide...

  • Page 48: Dc Current Gain Adjustments Procedure

    Table 1-12 DC current gain adjustment Input Function Range Input terminals open DC current 20 µA, 70 µA, 100 µA, –20 µA, –70 µA, –100 µA 100 µA 0.2 mA, 0.7 mA, 1 mA, –0.2 mA, –0.7 mA, –1 mA 1 mA 34450A Service Guide...

  • Page 49: Ac Voltage Gain Adjustment Procedure

    34. 4 Press to start the adjustment. The Status box displays CALIBRATING indicates the calibration is in progress. • Successful completion of each adjustment value is indicated by a message in the Status box showing PASS. 34450A Service Guide...

  • Page 50: Table 1-13 Ac Voltage Gain Adjustment

    Caution: Set the calibrator output to 0 V before disconnecting from the multimeter input terminals. [1] AC voltage flatness calibration for 1 kHz and 10 kHz need to completed for one range (example 100 mV) first before proceeding to another range (example 1 V). 34450A Service Guide...

  • Page 51: Ac Current Gain Adjustment Procedure

    19. Table 1-14 AC current gain adjustment Input Instrument Settings Current, rms Frequency Function Range 1 mA, 7 mA, 10 mA 1 kHz AC current 10 mA 10 mA, 70 mA, 100 mA 1 kHz 100 mA 34450A Service Guide...

  • Page 52: Ohms Gain Adjustment Procedure

    FAIL. Check the input value, range, function, and entered adjustment value to correct the problem and repeat the adjustment step. 5 Repeat step 1 through 4 for each gain adjustment point shown in the preset calibration point box. 34450A Service Guide...

  • Page 53: Table 1-15 Ohms Gain Adjustment

    [3] Do not remove kelvin 4-wire connection at the other end of the test leads (for DUT measurement) for 4-W resistance calibration. Before initiating any gain adjustment procedures, perform the zero adjustment at any range N O T E first. 34450A Service Guide...

  • Page 54: Capacitance Gain Adjustment Procedure

    0.1 µF, 1 µF 1 µF 10 nF, 100 nF 100 nF 1 nF, 10 nF 10 nF 0.4 nF, 1 nF 1 nF Input terminal open (remove any test leads or shorting plugs from the input terminals) 34450A Service Guide...

  • Page 55: Frequency Gain Adjustment Procedure

    1 Remove all shorting plugs and connections from the instrument. 2 Reset the Calibration Message (see “Calibration Message”). 3 Record the new Calibration Count (see “To read the calibration count”). 4 Press to exit the Calibration Mode. 5 Reset the “Calibration Security” on page 23 34450A Service Guide...

  • Page 56: Calibration Message

    To read the calibration count from remote, use the CALibration:COUNt? command. Use the following procedure to read the calibration count from the front panel. 1 In the Utility menu/Calibration mode display will show the calibration count. 34450A Service Guide...

  • Page 57: Calibration Errors

    Unable to store calibration data No calibration for this function DCV calibration failed DCI calibration failed RES calibration failed CAP calibration failed FRES calibration failed FREQ calibration failed ACV calibration failed ACI calibration failed ACV flatness calibration failed 34450A Service Guide...
  • Page 58 Performance Tests and Calibration Calibration Errors THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. 34450A Service Guide...
  • Page 59 Agilent 34450A 5½ Digit Multimeter Service Guide Disassembly and Repair Operating Checklist Types of Services Available Repackaging for Shipment Cleaning To Replace the Power Line Fuse To Replace a Current Input Fuse To Verify your Device License Self Test Errors...

  • Page 60: Disassembly And Repair

    Disassembly and Repair Operating Checklist Operating Checklist Before returning your multimeter to Agilent for service or repair check the following items: Is the multimeter inoperative? q Verify the power line voltage setting. q Verify the power line fuse is installed.

  • Page 61: 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 Agilent worldwide: www.agilent.com/find/assist Or contact your Agilent Technologies representative. Before shipping your instrument, ask the Agilent Technologies Service Center to provide shipping instructions, including what components to ship.

  • Page 62: Repackaging For Shipment

    Repackaging for Shipment Repackaging for Shipment If the unit is to be shipped to Agilent 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 63: To Replace The Power Line Fuse

    0.25 A 250 V Time- delay 1.9 Ohm 20.5 5.2mm glass- tube fuse, Agilent part number 2110- 1533. If you have determined that the fuse is faulty, replace it with one of the same size and rating. 1 Disconnect power cord. Depress tabs 1 and 2 Remove the line voltage selector from fuse 2 and pull fuse holder from rear panel.

  • Page 64: To Replace A Current Input Fuse

    Both the 100 mA and the 10 A current input terminals are fuse protected. The fuse for the 100 mA input terminal is located on the rear panel (refer to Agilent 34450A User’s Guide, Chapter 1). The fuse is a ×...

  • Page 65: To Verify Your Device License

    2 If you have purchased the GPIB option, the GPIB Option displays ON. 3 If you have purchased the 50k memory option, the 50k Memory option displays ON. 4 If you have not purchased any option, the GPIB Option and 50K Memory display OFF. 34450A Service Guide...

  • Page 66: Self Test Errors

    Self Test Errors Self Test Errors The 34450A self test (see the *TST? command) performs a series of tests on the instrument hardware. Any failure of these tests will generate a SCPI error number - 330, with additional test failure information. Refer to the Agilent 34450A Programmer’s Helpfile for more information.

  • Page 67: 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. 34450A Service Guide...

  • Page 68: Mechanical Disassembly

    Some circuits are active and have power applied even when the power switch is turned off. General disassembly 1 Remove power and all cables from the instrument. 2 Remove the carrying handle by rotating the handle upright and pulling out from the sides of the instrument. 34450A Service Guide...
  • Page 69 Mechanical Disassembly 3 Remove the instrument bumpers. Pull from a corner and stretch the bumpers off the instrument. 4 Remove the rear bezel. Loosen the two captive screws in the rear bezel and remove the rear bezel. 34450A Service Guide...
  • Page 70 Disassembly and Repair Mechanical Disassembly 5 Remove the cover. Remove the screw in the bottom of the cover and slide the cover off the instrument. Front panel removal 6 Remove the two screws holding the front panel. 34450A Service Guide...
  • Page 71 Disassembly and Repair Mechanical Disassembly 7 Disconnect the ribbon cable connectors from the front panel. 8 Disconnect the individual front panel wires as shown in the figure below: 34450A Service Guide...
  • Page 72 Mechanical Disassembly 9 Disconnect the fuse wire as shown in the figure below: 10 There is now enough space to allow the side of the front panel to be pried from the chassis and removed as an assembly. 34450A Service Guide...
  • Page 73 1 Remove the keyboard and display assembly. Remove the screw from the circuit board gently to disengage from the tabs. Lift the keyboard and display assembly from the plastic housing. 2 Pull the rubber keypad from the plastic housing. 34450A Service Guide...

  • Page 74: Replaceable Parts

    Table 2- 2 on page 58 includes a brief description of each replaceable part with its corresponding part number. You can find the latest 34450A support parts list at Agilent Test & Measurement Parts N O T E Catalog: http://www.agilent.com/find/parts...
  • Page 75 Replaceable Parts Table 2-2 Replaceable parts list Part Number Description × × 2110-1503 Fuse 0.4 A, 500 V Fast Acting 32 6.3 mm × × 2110-1533 Fuse 0.25 A 250 V Time-delay 1.9 Ohm 20.5 5.2 mm glass-tube 34450A Service Guide...

  • Page 76: Rack Mounting

    You can mount the multimeter in a standard 19- inch rack cabinet using one of three optional kits shown below. Instructions and mounting hardware are included with each rack- mounting kit. Any Agilent Technologies instrument of the same size can be rack- mounted beside ½...
  • Page 77 (tel) 0800 047 866 (fax) 0800 286 331 Other Asia Pacific Countries: (tel) (65) 6375 8100 (fax) (65) 6755 0042 Or visit Agilent World Wide Web at: www.agilent.com/find/assist Product specifications and descriptions in this document are subject to change without notice. Always refer to the Agilent website for the latest revision.

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