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Firmware update for U1273A Handheld Digital Multimeter

Always update your handheld digital multimeters with the latest firmware to maximize the performance of the instrument. Please follow all the instructions below to ensure the firmware installation is successful.

Release Date Version Version Description
2014-10-09 3.01 Firmware update for U1273A.

How to Download

  • 1. Connect the multimeter to your PC via the U1173B IR-USB connectivity cable and turn on the multimeter.
    2. Go to Start>All Programs>Keysight Technologies>Keysight U1273A Firmware Update>Keysight U1273A Firmware Update Software (version 3.01).
    3. Click Auto Search COM Port button to search and detect the unit. The model number, serial number and current firmware version of the multimeter will be displayed in the Model Number, Serial Number and Current Version field.
    4. Make sure the instrument is in connected status before you start firmware update. Click. Upload Firmware to start firmware update.
    5. The multimeter will reset and recover itself after the firmware update.
    6. Reset the multimeter to its Default values through the setup menu (refer to User Guide page 129). This step is mandatory.

How to Install

  • Installing the software:
    1. Unzip the zip file to a folder.
    2. Go to folder PL2303_Prolific_DriverInstaller, click on the ­PL2303_Prolific_DriverInstaller.exe to install the U1173B IR-USB cable driver.
    3. Double click the Setup.exe file to install the program.
    Uninstalling the software:
    1. Go to Start>Control Panel, then double click Add or Remove Programs.
    2. In the Currently installed progrms window, select the program that you want to remove, then click Remove.


  • Does Not Require a License

Supporting Documentation


Installs on:


Operating System

  • Windows 7
  • Windows Vista
  • Windows XP
  • Windows 2000


  • System Requirements: Intel Pentium 4, 1 GHz or equivalent, 512 MB RAM, 1 GB HDD free space.

Supported Instruments

  • U1273A