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U1231A/U1232A/U1233A Firmware Update

Release Date Version Version Description
2015-11-26 3.00 Update to fix U1231A/U1232A/U1233A miscellaneous bugs.

How to Download

  1. Unzip the zip file to a folder.
  2. Go to folder PL2303_XPVistaWin7_Driver, click on the “PL2303_XPVistaWin7Driver. Exe” to install the U1173B IR-USB cable driver.
  3. Double click the Setup.exe file to install the program.

How to Install

  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 U123xA Firmware Update > Keysight U123xA Firmware Update Software (Version 3.00).
  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's Guide page 96). This step is mandatory.


  • Does Not Require a License

Supporting Documentation


Installs on:


Operating System

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


  • System Requirements: Intel Pentium 4, 1GHz or equivalent, 512MB RAM, 1GB HDD free space
    Operating Systems: Windows 2000 SP4, Windows XP SP3, Windows Vista SP2, Windows 7 SP1
    Required accessory: U1173B IR-USB Connectivity Cable

Supported Instruments

  • U1231A, U1232A, U1233A