Power analysis (option R&S RTM-K31)
R&S
®
RTM3000
347User Manual 1335.9090.02 ─ 09
14.4.1.1 Quality results
The results of "Quality" measurements are:
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The voltage waveform
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The current waveform
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The power waveform that is the product of the current and voltage waveforms
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Numeric measurement results
Also, for each measurement result you can enable a statistic evaluation of the mea-
surement results. It returns the current, minimum and maximum measurement values,
the average and standard deviation, and the number of measured waveforms.
Voltage and current results
The voltage and current results are defined as follows:
Result Description
RMS Square root of the mean of the square of the current or voltage averaged
over N cycles
Crest, crest factor Peak value / RMS value
f, frequency Frequency of the signal
Power results
The power in a system is described by several physical quantities: real power, reactive
power, apparent power, and phase angle. In Power diagram for sinusoidal signals you
can see how these quantities are related if the voltage and the current are sinusoidal
signals. ||S|| stands for the vector norm value of the vector S.
Figure 14-1: Power diagram for sinusoidal signals
P = real power [W]
Q = reactive power [VAR]
||S|| = apparent power [VA]
φ
= phase angle between the current and the voltage sine waves [°]
Input power measurements
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