True Rms Ac Measurements - DATATEC EDU34450A Guia Del Usuario

The voltage measured, and so the resistance calculated, is in error by V . Using offset compensation can reduce
EMF
the errors caused by V . To make an offset compensated measurement, the meter makes two voltage
EMF
measurements, one with the current source on and one with the current source off, and subtracts the two
measurements. The actual voltage drop across the resistor, and the calculated resistance are obtained by:
First Reading - Second Reading = (I * R + V ) - V = I * R
EMF EMF
Offset compensation can be used in 2-Wire or 4-Wire ohms measurements (only available on 100 Ω, 1 kΩ, and 10
kΩ).

True RMS AC Measurements

True RMS responding multimeters, like the EDU34450A, measure the "heating" potential of an applied voltage.
Power dissipated in a resistor is proportional to the square root of an applied voltage, independent of the waveshape
of the signal. This instrument accurately measures true RMS voltage or current, as long as the wave shape contains
negligible energy above the instrument's effective bandwidth. Note that the instrument uses the same techniques to
measure true RMS voltage and true RMS current.
Waveform Shape Crest Factor AC RMS AC + DC RMS
Keysight EDU34450A User's Guide 105