Keysight 34450A Service Manual
  1. Manuals
  2. Brands
  3. Keysight Manuals
  4. Measuring Instruments
  5. 34450A
  6. Service manual

Keysight 34450A Service Manual

5 1/2 digit multimeter
Hide thumbs Also See for 34450A:
Table of Contents

Advertisement

Quick Links

See also: Service Manual
Keysight 34450A 5½ Digit
Multimeter
Service Guide

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 34450A and is the answer not in the manual?

Questions and answers

Related Manuals for Keysight 34450A

Summary of Contents for Keysight 34450A

  • Page 1 Keysight 34450A 5½ Digit Multimeter Service Guide...

  • Page 2: Safety Information

    Printed in Malaysia forth therein, does not require or CONTAINED HEREIN. SHOULD Published by: permit, among other things, that KEYSIGHT AND THE USER HAVE A Keysight: (1) Furnish technical SEPARATE WRITTEN AGREEMENT Keysight Technologies information related to commercial WITH WARRANTY TERMS COVERING...

  • Page 3: Safety Symbols

    Caution, risk of danger (refer to this Frame or chassis (ground) terminal 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. Keysight 34450A Service Guide...

  • Page 4: Regulatory Markings

    The CSA mark is a registered substance elements are expected to trademark of the Canadian leak or deteriorate during normal use. Standards Association. Forty years is the expected useful life of the product. Keysight 34450A Service Guide...

  • Page 5: General Safety Information

    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. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
  • Page 6 Protection Limits defined in the following section. – If the Test Lead Set is used in a manner not specified by Keysight Technologies, the protection provided by the Test Lead Set may be impaired.
  • Page 7 Protection plug into a branch outlet or socket. Limit of 10 A (rms) maximum current The 34450A may be used to make flowing from the LO input terminal. measurements with the HI and LO This is Protection Limit “D” in the inputs connected to mains in such figure.

  • Page 8: Environmental Conditions

    Altitude Operating up to 3,000 meters Pollution degree Pollution Degree 2 The Keysight 34450A 5½ Digit Multimeter complies with the following EMC and NOTE safety requirements: – IEC 61010-1: 2001 / EN 61010-1: 2001 (2nd Edition) – IEC 61326-2-1: 2005 / EN61326-2-1: 2006 –...

  • Page 9: 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/34450A (product-specific information and support, software and documentation updates) –...

  • Page 10: Additional Notices

    Additional Notices The Keysight 34450A is provided with a Keysight 34138A Test Lead Set, described below. Test Lead Ratings Test Leads - 1000 V, 15 A Fine Tip Probe Attachments - 300 V, 3 A Mini Grabber Attachment - 300 V, 3 A...

  • Page 11: Table Of Contents

    AC voltage verification test ....... .32 Keysight 34450A Service Guide...
  • Page 12 ........66 Keysight 34450A Service Guide...
  • Page 13 ..........74 Keysight 34450A Service Guide...
  • Page 14 Keysight 34450A Service Guide...
  • Page 15 ......64 Table 2-2 Replaceable parts list ......72 Keysight 34450A Service Guide...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34450A Service Guide...
  • Page 17 Keysight 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: Performance Tests And Calibration

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

  • Page 19: Calibration Interval

    A one year interval is adequate for most applications. Accuracy specifications are warranted only if adjustment is made at regular calibration intervals. Accuracy specifications are not warranted beyond the one year calibration interval. Keysight does not recommend extending calibration intervals beyond two years for any application.

  • Page 20: Recommended Test Equipment

    If the exact instrument is not available, substitute calibration standards of equivalent accuracy. A suggested alternate method would be to use the Keysight 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

    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. Keysight 34450A Service Guide...

  • Page 22: 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 Keysight 34450A User’s Guide, Chapter 4, Specifications. You can perform four different levels of performance verification tests: –...

  • Page 23: 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. Keysight 34450A Service Guide...

  • Page 24: 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. Keysight 34450A Service Guide...

  • Page 25: 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 Keysight 34450A Service Guide...

  • Page 26: Gain Verification

    DC voltage gain verification test 1 Connect the calibrator to the front panel HI and LO input terminals as shown in the figure below: Keysight 34450A Service Guide...

  • Page 27: Dc Current Gain Verification Test

    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 Keysight 34450A Service Guide...

  • Page 28: Table 1-4 Dc Current Gain Verification Test

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

  • Page 29: Ohms Gain Verification Test

    1 Connect the calibrator to the front panel HI and LO input terminals as shown in the figure below: 2-W resistance with compensation (For range 100 Ω ~ 100 kΩ) 2-W resistance without compensation (For range 1 MΩ ~ 100 MΩ) Keysight 34450A Service Guide...
  • Page 30 2 Select the 4-W Ohms or 2-W Ohms function. 3 Select each range in the order shown below. Provide the resistance value indicated. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.) Keysight 34450A Service Guide...

  • Page 31: Frequency Gain Verification Test

    3 Select each range in the order shown below. Provide the input voltage and frequency indicated. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.) Keysight 34450A Service Guide...

  • Page 32: Ac Voltage Verification Test

    3 Select each range in the order shown below. Provide the indicated input voltage and frequency. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling). Keysight 34450A Service Guide...

  • Page 33: Table 1-7 Ac Volts Verification Test

    100 V ±0.3 V 100 V 10 kHz 100 V ±0.3 V 100 V 30 kHz 100 V ±1.8 V 100 V 100 kHz 100 V ±3.3 V 750 V 45 Hz 750 V ±2.25 V Keysight 34450A Service Guide...

  • Page 34: 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 Keysight 34450A Service Guide...

  • Page 35: Table 1-8 Ac Current Verification Test

    100 mA ±2.2 mA 100 mA 10 kHz 100 mA ±2.2 mA Caution: Connect calibrator to mul timeter’s 10 A and LO terminal before applying 1A and 10 A. 20 Hz ±16 mA 45 Hz ±6 mA Keysight 34450A Service Guide...
  • Page 36 10 A 45 Hz 10 A ±60 mA 10 A 1 kHz 10 A ±60 mA 5 kHz 10 A ±60 mA [a] Select Slow Mode 5½ digit measurement resolution Q = Quick performance verification test points Keysight 34450A Service Guide...

  • Page 37: Capacitance Performance Verification Test

    10 mF 10 mF ± 0.25 mF [a] 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. Keysight 34450A Service Guide...

  • Page 38: Calibration Security

    Refer to the CAL:SEC:CODE command in the 34450A Programmer’s Reference Help File for more details. The security code may contain up to 12 alphanumeric characters. The first character must be a letter.

  • Page 39: Unsecuring The Instrument For Calibration

    Assume the calibration security code has been set to ATB1 through remote interface. The first two characters (AT) are ignored. The B is represented by a zero. The “1” is still used and trailing zeros fill in the remaining characters. Use this code to unsecure: 01000 Keysight 34450A Service Guide...
  • Page 40 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.

  • Page 41: Calibration Process

    44). 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 NOTE records. Keysight 34450A Service Guide...

  • Page 42: Using The Front Panel For Adjustments

    Performance Tests and Calibration 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 43 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 44: Adjustments

    – Be sure to allow the instrument to warm up and stabilize for four hours before performing the 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. Keysight 34450A Service Guide...

  • Page 45: Dc Voltage Gain Adjustment Procedure

    (0.1, 1) x Full Scale Frequency 1 V, 1 kHz , 1 kHz DC voltage gain adjustment procedure Review the “Test Considerations” on page 21 and “Gain adjustment considerations” on page 44 sections before beginning this procedure. Keysight 34450A Service Guide...
  • Page 46 [a] Cal Item 0 mV only calibrated once during DC voltage gain adjustment procedure. You need to re-calibrate once you exit calibration mode. [b] Calibration need to be done on 1 V range first before proceeds to other ranges. Keysight 34450A Service Guide...

  • Page 47: Dc Current Gain Adjustments Procedure

    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 2 mA, 7 mA, 10 mA, –2 mA, –7 mA, –10 mA 10 mA Keysight 34450A Service Guide...

  • Page 48: Ac Voltage Gain Adjustment Procedure

    Status box showing PASS. – An adjustment failure is indicated by a message in the Status box showing FAIL. Check the input value, range, function, and entered adjustment value to correct the problem and repeat the adjustment step. Keysight 34450A Service Guide...

  • Page 49: Table 1-13 Ac Voltage Gain Adjustment

    Caution: Set the calibrator output to 0 V before d isconnecting from the mul timeter input terminals. [a] 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). Keysight 34450A Service Guide...

  • Page 50: Ac Current Gain Adjustment Procedure

    DONE, and the value in the Calibration Range box flashes. 7 Increase the range and continue the calibration by repeating steps 1 through 4. 8 Verify the AC current gain adjustments using the “AC current verification test” on page 34. Keysight 34450A Service Guide...

  • Page 51: 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. Keysight 34450A Service Guide...

  • Page 52: Table 1-15 Ohms Gain Adjustment

    [c] 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 NOTE at any range first. Keysight 34450A Service Guide...

  • Page 53: 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) Keysight 34450A Service Guide...

  • Page 54: 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 38. Keysight 34450A Service Guide...

  • Page 55: 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. Keysight 34450A Service Guide...

  • Page 56: 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 Keysight 34450A Service Guide...
  • Page 57 Keysight 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 58: Disassembly And Repair

    Disassembly and Repair Operating Checklist Before returning your multimeter to Keysight for service or repair check the following items: Is the multimeter inoperative? ✔ Verify the power line voltage setting. ✔ Verify the power line fuse is installed. ✔ Verify that the power cord is connected to the multimeter and to AC line power.

  • Page 59: Types Of Services Available

    Disassembly and Repair Types of Services Available If your instrument fails during the warranty period, Keysight Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Keysight offers repair services at competitive prices. Extended service contracts Many Keysight products are available with optional service contracts that extend the covered period after the standard warranty expires.

  • Page 60: Repackaging For Shipment

    Disassembly and Repair 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 61: To Replace The Power Line Fuse

    The supplied fuse is a time-delay, 0.25 A 250 V Time-delay 1.9 Ohm 20.5×5.2×5.2mm glass-tube fuse, Keysight part number 2110-1533. If you have determined that the fuse is faulty, replace it with one of the same size and rating.

  • Page 62: To Replace A Current Input Fuse

    100 mA input terminal is located on the rear panel (refer to Keysight 34450A User’s Guide, Chapter 1). The fuse is a 0.4A 500 V fast acting 32×6.3×6.3 mm fuse, Keysight part number 2110- 1503. If you have determined that the fuse is faulty, replace it with one of the same size and rating.

  • Page 63: 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 4 If you have not purchased any option, the GPIB Option and 50K Memory display OFF. Keysight 34450A Service Guide...

  • Page 64: Self Test Errors

    Disassembly and Repair 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 Keysight 34450A Programmer’s Helpfile for more information.

  • Page 65: 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 34450A Service Guide...

  • Page 66: Mechanical Disassembly

    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. Keysight 34450A Service Guide...
  • Page 67 Disassembly and Repair 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. Keysight 34450A Service Guide...
  • Page 68 Disassembly and Repair 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. Keysight 34450A Service Guide...
  • Page 69 Disassembly and Repair 7 Disconnect the ribbon cable connectors from the front panel. 8 Disconnect the individual front panel wires as shown in the figure below: Keysight 34450A Service Guide...
  • Page 70 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. Keysight 34450A Service Guide...
  • Page 71 1 Remove the keyboard and d isplay 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. Keysight 34450A Service Guide...

  • Page 72: Table 2-2 Replaceable Parts List

    Table 2-2 on page 72 includes a brief description of each replaceable part with its corresponding part number. You can find the latest 34450A support parts list at Keysight Test & NOTE Measurement Parts Catalog: http://www.keysight.com/find/parts. To order replaceable parts...
  • Page 73 Fuse, Fast acting, 11.0 A, 1000.0 V 2110-1503 Fuse 0.4 A, 500 V Fast Acting 32 × 6.3 × 6.3 mm 2110-1533 Fuse 0.25 A 250 V Time-delay 1.9 Ohm 20.5 × 5.2 × 5.2 mm glass-tube Keysight 34450A Service Guide...

  • Page 74: 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 Keysight Technologies instrument of the same ½ size can be rack-mounted beside the 34450A 5 Digit Multimeter.
  • Page 75 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2012-2017 Edition 7, July 28, 2017 Printed in Malaysia *34450-90029* 34450-90029 www.keysight.com...

Table of Contents