1 Introduction  
About This Manual
2 U1231A/U1232A/U1233A User’s Guide
About This Manual
The descriptions and instructions in this manual apply to 
the Keysight U1231A, U1232A, and U1233A handheld digital 
multimeters (hereafter referred to as the multimeter). 
The model U1233A appears in all illustrations.
Documentation map
The following manuals and software are available for your 
multimeter. For the very latest version, please visit our 
website at: http://www.keysight.com/find/hhTechLib.
Check the manual revision on the first page of each manual.
• User’s Guide. This manual.
•Quick Start Guide. Printed copy for outdoor use, 
included with shipment.
• Service Guide. Free download at the Keysight website.
• Keysight GUI Data Logger Software, Help, and Quick 
Start Guide. Free download at the Keysight website.
Safety notes
Safety notes are used throughout this manual (see the 
“Safety Notices” section for format examples). Familiarize 
yourself with each of the notes and its meaning before 
operating your multimeter. 
More pertinent safety notes for using this product are 
located under the 
“Safety Considerations” section.
Do not proceed beyond a safety notice until the indicated 
conditions are fully understood and met.