User Manual AMETEK Programmable Power
RS Series 112
4.5.2 3Pi Controller Measurements
For RS Series with the -3Pi controller, the following four measurement screens are available:
Mode AC DC AC+DC
MEASUREMENTS 1
VOLTAGE AC rms voltage DC Voltage AC rms voltage
POWER Real power n/a n/a
MEASUREMENTS 2
VA POWER Apparent power power Apparent power
PEAK CURR Highest AC current
found
Highest DC current
found
Highest AC
current found
POWER FACT Power factor n/a Power factor
CREST FACT Crest factor n/a Crest factor
MEASUREMENTS 3
VOLT THD Voltage distortion n/a Voltage distortion
CURR THD Current distortion n/a Current distortion
INST PK CURR Instantaneous peak
current
Highest DC current
found
Instantaneous
peak current
PHASE Phase angle n/a Phase angle
The 3Pi controller has a fourth measurement screen for harmonics and trace analysis
measurements. This subject is covered in the next chapter.
Note: The V and I distortion calculations are based on H2 through H50 with the RMS current in
the denominator. Note that some definitions of THD use the fundamental component (H1) as the
denominator. This may result in different readings between instruments depending on the
implementation chosen.
Measurements are always running in the background. When the user selects a measurement
screen for display, the AC source first updates all the measurement parameters before
displaying the requested screen. This process may take up to a second. Consequently, pressing
the MEAS key may not always bring up the selected screen immediately. There will be a
perceptible delay. This will prevent the screen from appearing with invalid or blank readouts.
The measurement method for voltage and current will depend on the power source’s operating
mode. The following table shows the return value type (rms or average) and method of coupling
when the measurement command is initiated with a different extension at various operating
modes (AC, DC or AC + DC).
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