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U1241C/U1242C Firmware Update

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

Release Date Version Version Description
2016-05-08 1.22 Update to fix U1241C/U1242C 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 U1241C U1242C Firmware Update > Keysight U1241C U1242C Firmware Update (Version 1.22).
  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.


  • Does Not Require a License

Supporting Documentation


Installs on:


Operating System

  • Windows XP SP3
  • Windows 2000 SP4
  • Windows Vista SP2
  • Windows 7 SP1
  • Windows XP SP3


  • 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

  • U1241C, U1242C