Keysight U1271A Service Manual
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Keysight U1271A Service Manual

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  • Page 1 Keysight U1270 Series Handheld Digital Multimeters Service Guide...

  • Page 2: Safety Information

    OR OF ANY INFORMATION Software. The EULA and the license set CONTAINED HEREIN. SHOULD Printed in Malaysia KEYSIGHT AND THE USER HAVE A forth therein, does not require or SEPARATE WRITTEN AGREEMENT Published by: permit, among other things, that...

  • Page 3: Safety Symbols

    Category III 1000 V overvoltage CAT III Both direct and alternating current protection 1000 V Category IV 600 V overvoltage CAT IV Earth (ground) terminal protection 600 V Equipment protected throughout by double insulation or reinforced insulation Keysight U1270 Series Service Guide...

  • Page 4: Safety Considerations

    Safety Considerations Read the information below before using this multimeter. The descriptions and instructions in this manual apply to the Keysight U1271A, U1272A, U1273A, and U1273AX Handheld Digital Multimeters (hereafter referred to as the multimeter). The U1273A and U1272A models appear in all illustrations.
  • Page 5 When servicing the multimeter, use only the specified replacement parts. – To avoid false readings, which may lead to possible electric shock or personal injury, replace the battery as soon as the low battery indicator appears and flashes. Keysight U1270 Series Service Guide...

  • Page 6: Measurement Category

    Measurement CAT IV Measurements performed at the source of the low-voltage installation. Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units. Keysight U1270 Series Service Guide...

  • Page 7: Environmental Conditions

    The table below shows the general environmental requirements for this instrument. Environmental cond ition Requirement Operating condition – U1271A/U1272A/U1273A: –20 °C to 55 °C Temperature – U1273AX: –40 °C to 55 °C (using Lithium batteries) Storage condition – –40 °C to 70 °C Operating condition –...

  • Page 8: 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 U1270 Series Service Guide...

  • 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/handhelddmm (product-specific information and support, software and documentation updates) –...
  • Page 10 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1270 Series Service Guide...

  • Page 11: Table Of Contents

    ........21 Backlight test (U1271A/U1272A only) .
  • Page 12 ....... . 61 Obtaining Repair Service (Worldwide) ......62 Keysight U1270 Series Service Guide...
  • Page 13 ......57 Figure 2-5 Positions of Fuse 1 and Fuse 2 ....58 Keysight U1270 Series Service Guide...
  • Page 14 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1270 Series Service Guide...
  • Page 15 ......50 Table 2-2 Fuse displayed readings ......52 Keysight U1270 Series Service Guide...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1270 Series Service Guide...
  • Page 17 Keysight U1270 Series Handheld Digital Multimeters Service Guide Calibration Procedures Calibration Overview Recommended Test Equipment Basic Operating Test Calibration Process Test Considerations Performance Verification Tests Calibration Security Unsecuring the Instrument for Calibration Using the Front Panel for Adjustments Calibration Count...

  • Page 18: Calibration Procedures

    The nonvolatile EEPROM calibration memory is retained even when the power is switched off. Keysight calibration services When your instrument is due for calibration, contact your local Keysight Service Center to enquire about recalibration services. Keysight U1270 Series Service Guide...

  • Page 19: Calibration Interval

    A 1-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 1-year calibration interval. Keysight does not recommend extending calibration intervals beyond 2 years for any application.

  • Page 20: Recommended Test Equipment

    1-1). If the exact instrument is not available, substitute with another calibration standard of equivalent accuracy. A suggested alternative method is to use the Keysight 3458A 8½ Digit Digital Multimeter to measure less accurate but stable sources. The output value measured from the source can be entered into the instrument as the target calibration value.

  • Page 21: Basic Operating Test

    Basic Operating Test The tests listed below are used to test the basic operability of the instrument. Repair is required if the instrument fails any of these tests. – “Backlight test (U1271A/U1272A only)” – “Display test” – “Current terminal input test”...

  • Page 22: Current Terminal Input Test

    The multimeter sounds a continuous alert beep when the test lead is inserted into the A terminal but the rotary switch is not set to the function. The multimeter displays an input warning error (Figure 1-3). Figure 1-3 Input warning display (A terminal) Keysight U1270 Series Service Guide...

  • Page 23: Input Warning Display (Μa Ma Terminal)

    The alert beep tone will continue to beep until the test lead is removed from the µA mA terminal or until the rotary switch is set to the function. Before conducting this test, ensure that the beep function is not disabled in the NOTE multimeter’s setup. Keysight U1270 Series Service Guide...

  • Page 24: Calibration Process

    6 Secure the instrument against unauthorized calibration; see “Exiting the adjustment mode” on page 46. 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. Keysight U1270 Series Service Guide...

  • Page 25: Test Considerations

    – Use a shielded twisted pair of PTFE-insulated cables to reduce settling and noise errors. Keep the input cables as short as possible. Long test leads can also act as antennas which may pick up AC signals. – Connect the input cable shields to earth ground. Keysight U1270 Series Service Guide...

  • Page 26: Performance Verification Tests

    Performance Verification Tests 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 U1271A/U1272A User's Guide and the U1273A/ U1273AX User’s Guide (available for download at www.keysight.com/find/ hhTechLib).
  • Page 27 U1272A/U1273A/U1273AX, then turn the U1272A/U1273A/U1273AX rotary switch to the position before proceed ing with the following Z functional test. U1252B input 1000 V 1.67 kΩ ±0.167 kΩ Turn the rotary switch to position. [a] Functional test only. Keysight U1270 Series Service Guide...

  • Page 28: Table 1-2 Performance Verification Tests

    270 V, 20 kHz ±5.80 V 1000 V 1000 V, 45 Hz ±9.0 V ±8.0 V 1000 V, 65 Hz ±9.0 V ±8.0 V 1000 V, 1 kHz ±12.5 V ±12.5 V 1000 V, 5 kHz ±17.5 V Keysight U1270 Series Service Guide...
  • Page 29 300 mV, 65 Hz ±2.30 mV ±2.00 mV 300 mV, 1 kHz ±3.25 mV ±2.35 mV 300 mV, 5 kHz ±6.25 mV ±3.25 mV 300 mV, 20 kHz ±6.40 mV ±3.40 mV 300 mV, 100 kHz ±10.90 mV Keysight U1270 Series Service Guide...
  • Page 30 27 V, 100 kHz ±1.017 V 300 V 300 V, 45 Hz ±2.35 V 300 V, 65 Hz ±2.35 V 300 V, 1 kHz ±3.60 V 300 V, 5 kHz ±5.10 V 270 V, 20 kHz ±6.12 V Keysight U1270 Series Service Guide...
  • Page 31 300 mV, 45 Hz ±2.35 mV key twice. 300 mV, 65 Hz ±2.35 mV 300 mV, 1 kHz ±2.70 mV 300 mV, 5 kHz ±3.60 mV 300 mV, 20 kHz ±3.75 mV 300 mV, 100 kHz ±11.25 mV Keysight U1270 Series Service Guide...
  • Page 32 ±0.102 mF ±0.102 mF [f] The accuracy for all ranges is specified based on a film capacitor or better, and after the Null function is used to subtract the residual values (by opening the test leads). Keysight U1270 Series Service Guide...
  • Page 33 ±2.95 μA ±2.95 μA 3000 μA 3000 μA, 20 Hz ±29.5 μA 3000 μA, 45 Hz ±29.5 μA ±20.5 μA 3000 μA, 65 Hz ±29.5 μA ±20.5 μA 3000 μA, 1 kHz ±29.5 μA ±29.5 μA Keysight U1270 Series Service Guide...
  • Page 34 3 A, 1 kHz ±0.0325 A ±0.0325 A 10 A 10 A, 45 Hz ±0.125 A ±0.105 A 10 A, 65 Hz ±0.125 A ±0.105 A 10 A, 1 kHz ±0.125 A ±0.125 A Keysight U1270 Series Service Guide...

  • Page 35: Calibration Security

    The security code is set to “1234” when the instrument is shipped from the factory. The security code is stored in nonvolatile memory, and does not change when power has been turned off. The security code may contain up to four numeric characters. Keysight U1270 Series Service Guide...

  • Page 36: Unsecuring The Instrument For Calibration

    2 Key in the default security code if you are unsecuring your instrument for the first time. – Press to move the cursor to the right or to the left. – Press to increment or decrement the digit. Dual Exit Setup 3 Press when you are done. Keysight U1270 Series Service Guide...

  • Page 37: To Change The Calibration Security Code

    If the new calibration security code has been successfully stored, the display will show PASS. Record down your new calibration security code and store it in a safe location. Keysight U1270 Series Service Guide...

  • Page 38: To Reset The Calibration Security Code To Its Factory Default

    1 second. The calibration security code entry is shown on the display. 3 Press (for U1273A/U1273AX) or (for U1271A/U1272A) for more than 1 second. Figure 1-7 Resetting the calibration security code 4 Set the code to the same as the last four digits of the instrument’s serial number.
  • Page 39 If you want to enter a new security code, see “To change the calibration security code” on page 37. Ensure that you record down the new security code. Keysight U1270 Series Service Guide...

  • Page 40: Using The Front Panel For Adjustments

    4 Before proceeding with the ambient temperature adjustment, be sure to turn on the multimeter for at least 1 hour with the K-type thermocouple connected. Never turn off the multimeter during an adjustment. This may delete the CAUTION calibration memory for the present function. Keysight U1270 Series Service Guide...

  • Page 41: Valid Adjustment Input Values

    0.9 to 1.1 × Reference value 30 V 30.000 V 0.9 to 1.1 × Reference value 300 V 300.00 V 0.9 to 1.1 × Reference value 1000 V 1000.0 V 0.9 to 1.1 × Reference value Keysight U1270 Series Service Guide...
  • Page 42 0.9 to 1.1 × Reference value DCmA/DCA 300 mA 300.00 mA 0.9 to 1.1 × Reference value 3.0000 A 0.9 to 1.1 × Reference value 10 A 10.000 A 0.9 to 1.1 × Reference value Keysight U1270 Series Service Guide...
  • Page 43 0.9 to 1.1 × Reference value 1000 μF 1000.0 μF 0.9 to 1.1 × Reference value 10 mF 10.000 mF 0.9 to 1.1 × Reference value OPEN terminals (no cables connected to CAP/ OPEN OPEN COM terminals) Keysight U1270 Series Service Guide...
  • Page 44 [a] After capacitance calibration is completed, calibrate the OPEN item again by removing all cable connections from the Device-Under-Test (DUT). [b] With a 2-wire connection and compensation enabled at the calibrator. [c] After resistance calibration is completed, calibrate the SHORT item again by inserting a short bar between the Ω/COM terminals. Keysight U1270 Series Service Guide...

  • Page 45: Adjustment Procedure

    5 Use the arrow keys to select the calibration range. 6 Apply the input signal shown in the Reference value column of Table 1-3. The analog bar graph displays the input reading. There is no bar graph display for temperature adjustment. Keysight U1270 Series Service Guide...

  • Page 46: Exiting The Adjustment Mode

    1 Remove all the shorting plugs and connectors from the instrument. 2 Record the new Calibration Count. 3 Press simultaneously to exit the Adjustment Mode. 4 Cycle the instrument’s power. The instrument will then be secured. Keysight U1270 Series Service Guide...

  • Page 47: Calibration Count

    1 In adjustment mode, press 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 Press again to exit the calibration count mode. Keysight U1270 Series Service Guide...

  • Page 48: Calibration Error Codes

    Calibration error: serial number code invalid Er004 Calibration error: calibration aborted Er005 Calibration error: value out of range Er006 Calibration error: signal measurement out of range Er007 Calibration error: frequency out of range Er008 EEPROM write failure Keysight U1270 Series Service Guide...
  • Page 49 Keysight U1270 Series Handheld Digital Multimeters Service Guide Service and Maintenance Troubleshooting Checking the Fuse Fuse Replacement Returning the Instrument for Service Replaceable Parts Types of Service Available Obtaining Repair Service (Worldwide) This chapter will help you troubleshoot a failing instrument. It also describes how...

  • Page 50: Service And Maintenance

    ✔ Verify the fuses health and replace the fuses as necessary. ✔ Verify the optical side of the IR-USB cable connected to the multimeter — the Keysight logo should be facing up. Failed on remote control ✔ Verify the baud rate, data bit, and parity settings in the multimeter’s setup mode.

  • Page 51: Checking The Fuse

    Ensure that the probe tip touches the metal inside the A input terminal, as shown in Figure 2-2. 4 Observe the reading on the instrument's display. Refer to Table 2-2 below for the possible readings that could appear. Replace the fuse when OL is displayed. Keysight U1270 Series Service Guide...

  • Page 52: Table 2-2 Fuse Displayed Readings

    Service and Maintenance Table 2-2 Fuse displayed readings Displayed read ings Current input terminal Fuse Part number Fuse rating Fuse heal thy Replace fuse 2110-1400 440 mA/1000 V ≈102 Ω 2110-1402 11 A/1000 V ≈0.05 Ω Keysight U1270 Series Service Guide...

  • Page 53: Testing Fuse 1

    Service and Maintenance Smart Smart Figure 2-1 Testing Fuse 1 Keysight U1270 Series Service Guide...

  • Page 54: Testing Fuse 2

    Service and Maintenance Smart Smart Figure 2-2 Testing Fuse 2 Keysight U1270 Series Service Guide...

  • Page 55: Fuse Replacement

    Replace a new fuse of the same size and rating into the center of the fuse holder. 3 Close the batter cover. Place the battery cover back in its original position and tighten the screws. Keysight U1270 Series Service Guide...

  • Page 56: Replacing Fuse 1

    Service and Maintenance Figure 2-3 Replacing Fuse 1 Keysight U1270 Series Service Guide...

  • Page 57: Replacing Fuse 2

    Service and Maintenance Figure 2-4 Replacing Fuse 2 Keysight U1270 Series Service Guide...

  • Page 58: Positions Of Fuse 1 And Fuse 2

    Service and Maintenance Fuse 1: 10 × 35 mm 440 mA/1000 V fast-acting fuse Fuse 2: 10 × 38 mm 11 A/1000 V fast-acting fuse Figure 2-5 Positions of Fuse 1 and Fuse 2 Keysight U1270 Series Service Guide...

  • Page 59: Returning The Instrument For Service

    Returning the Instrument for Service Before shipping your instrument for repair or replacement, Keysight recommends that you acquire the shipping instructions from the Keysight Service Center. A clear understanding of the shipping instructions is necessary to secure your product for shipment.

  • Page 60: 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 support parts list. 3 Provide the instrument model number and serial number.

  • Page 61: Types Of Service Available

    Service and Maintenance Types of Service Available If your instrument fails during the warranty period, Keysight 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 62: Obtaining Repair Service (Worldwide)

    Obtaining Repair Service (Worldwide) To obtain service for your instrument (in-warranty, under service contract, or post-warranty), contact your nearest Keysight Service Center. They will arrange to have your unit repaired or replaced, and can provide warranty or repair-cost information where applicable.
  • Page 63 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2010—2016 Edition 17, July 30, 2016 Printed in Malaysia *U1271-90020* U1271-90020 www.keysight.com...

This manual is also suitable for:

U1272aU1273aU1273ax

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