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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
2019-06-26 1.27 Update to fix bug – Readings intermittently dropped to zero during data logging.

How to Download

  1. Double click on the installer 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 C:\\ Program Files (x86) \ Keysight Technologies \ Keysight U1241C U1242C Firmware Update (Version 1.27)
  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 10


  • PL2303_XPVistaWin7_Driver for Windows XP/ Vista/ 7 user (Driver is available in the zip file).

Supported Instruments

  • U1241C, U1242C