Keysight U3401A - Measure True RMS AC + DC

Application Tutorial 3
Keysight U3401A User’s and Service Guide 69
Measure True RMS AC + DC
The multimeter can measure the true RMS of AC voltage and AC current.
1 Press , and or and simultaneously. The
multimeter will measure the DC and AC signals alternatively, calculate and
display the AC+DC RMS value using the quation below:
AC+DC (RMS) = DC
2
+ AC
2
NOTE
When AC+DC voltage measurement is selected, the DCV input impedance is
paralleled with the AC coupled 1.1 MΩ AC divider.