Features and Functions   2
U1241B/U1242B User’s and Service Guide 25
Alerts and Warning During Measurement 
Overload Alert
The multimeter provides an overload alert for voltage measurement in 
both auto and manual range modes. The multimeter beeps periodically 
once the measuring voltage exceeds 1100.0 V. For your safety, please be 
aware of this alert.
Input-A Warning Alert 
The multimeter sounds an alerting beep when the test lead is inserted to 
the A  input terminal but the rotary switch is not set to the corresponding 
A location. The display indicates a flashing AErr annunciator until the 
test lead is removed from the A input terminal. This warning alert is not 
available in T1/T2 temperature measurements mode. 
Input-mA Warning Alert 
The multimeter sounds an alerting beep when the μA/mA  input terminal 
detects a voltage level of more than 1.6 V. The display indicates a flashing 
CErr annunciator until the test lead is removed from the μA/mA input 
terminal.
For your safety, please be aware of the alert. When you are alerted, just remove the test 
leads from the measuring source.