1 Introduction  
Preparing Your Multimeter
10 U1231A/U1232A/U1233A User’s Guide
Alerts and warnings during measurement
Voltage alert
Your multimeter provides a voltage alert for voltage 
measurements in both autoranging and manual range modes. 
The multimeter starts beeping periodically once the 
measured voltage exceeds the alert value (regardless of 
polarity) set in the Setup menu.
By default, this feature is turned off. Be sure to set the alert 
voltage according to your test requirements. To change the 
alert voltage level, refer to 
“Enabling and changing the 
voltage alert level”  on page  86.
Hazardous voltage indication
The multimeter will also display the hazardous voltage ( ) 
symbol as an early precaution when the measured voltage is 
equal to or greater than 30 V in all voltage measurement 
modes.
For your own safety, please do not ignore the voltage alert. When the 
multimeter cautions you with a voltage alert, you are advised to take 
note of the existence of high voltage and pay closer attention when 
performing measurements.