Escort 3136A - 4-4 Measuring True RMS AC+DC

To Next Page

To Previous Page

4-4 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 =

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 0.1V

rms

1kHz sine wave ac signal and with a dc offset voltage +4.5 volts, the

meter will read and display the results approximately as:

1.05.4 +

≒

4.5011 volts