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4-5 Measuring True RMS AC+DC
The meter can measure the true rms value of ac voltages and currents.
When
and or and are pressed simultaneously, the
meter will measure the dc and ac signals alternatively then calculate and display the
ac+dc rms value by using the following formula:
(ac+dc) RMS =
22
acdc +
Note: When voltage (ac+dc) measurement function is selected, the Vdc input impedance is paralleled
with an ac-coupled 1.1M
Ω
ac divider.
!
Measurement example:
To take a true rms voltage ac+dc measurement on an ac signal, assuming the input
ac is 10V
rms
1kHz sine wave ac signal and with a dc offset voltage +5 volts, the
meter will read and display the results approximately as:
22
105 +
11.1803 volts
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