Keysight U1253B Guía Del Usuario Y Servicios página 82

Making Measurements 2
Input warning
The multimeter emits a continuous beep when the test lead is inserted to the A
input terminal but the rotary switch is not set to the corresponding mA.A position.
A warning message Error ON A INPUT will be displayed until the test lead is
removed from the A input terminal. Refer to Figure 2-18.
Figure 2-18 Input terminal warning
Keysight U1253B User's and Service Guide 81