User Manual – Rev AV AMETEK Programmable Power
MX Series 133
4.5.2 3Pi Controller Measurements
For MX Series with the -3Pi controller, the following four measurement screens are available:
Instantaneous peak
current
Instantaneous
peak current
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).
Measurement
Extension
and Coupling
AC DC AC + DC
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