3 Using the Oscilloscope
74 Keysight U1610/20A User’s Guide
RMS (AC)
AC voltage is normally expressed as a root-mean-square (RMS) value,
represented as Vrms. For a sinusoidal voltage, Vrms is equivalent to Vpeak/√2.
RMS (DC)
VRMS (DC) is the RMS value of the waveform over one or more full periods.
Power measurements
Power measurement is a point-by-point multiplication of the voltage and current
waveforms measured by the voltage and current probes.
The U1610/20A is designed to measure power factor, active power, reactive
power, and apparent power in the electrical power distribution system in factories
or commercial and residential areas. It is ideally suited to measure power in the
50 Hz or 60 Hz cycle commonly found in the power distribution system.
For higher frequency applications such as those found in switch mode power
supplies, a deskewing mechanism is needed in order to compensate for the time
delay between the voltage and current probes.
This is important as a small offset in the timing of the high frequency voltage and
current traces can cause a large error in the instantaneous power reading. The
U1610/20A is not able to support this high frequency power measurement
application.
Ensure that the correct attenuation factor/sensitivity is set for the connected
voltage/current probe respectively. Refer to page 69 for more information in
setting up the probes.
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