AMETEK MX Series Rev: AY - Manual (Page 94)

User Manual – Rev AY AMETEK Programmable Power
MX Series 94
PEAK CURR This readout reflects the peak current value detected at the
output. To measure inrush current for a unit under test, open the
output relay and reset the peak current value using the PEAK
CURR RESET entry. Then program the output voltage and
frequency and turn on the output relay. The peak current
measurement will continuously track the maximum current value
detected until reset.
POWER FACTOR This readout shows the power factor of the load.
CREST FACTOR This readout displays the ratio between peak current and rms
current.
MEASUREMENT 3 [3Pi controller only]
VOLT THD This readout displays the total voltage distortion for the selected
phase. The distortion calculation is based on the H2 through
H50 with the fundamental voltage (H1) in the denominator. Note
that other common definitions of THD use the RMS value of the
voltage as the denominator. This may result in different readings
between instruments depending on the implementation chosen.
The mode used by the power source is selectable over the bus.
CURR THD This readout displays the total current distortion for the selected
phase. The distortion calculation is based on the H2 through
H50 with the fundamental current (H1) in the denominator. Note
that other common definitions of THD use the RMS value of the
current as the denominator. This may result in different readings
between instruments depending on the implementation chosen.
The mode used by the power source is selectable over the bus.
INST PK CURR This readout reflects the instantaneous peak current value
detected at the output. This value is updated continuously and
does not require a reset operation like the PEAK CURR readout.
The instantaneous peak current does not use a track and hold
mechanism like the PEAK CURR measurement in the
MEASUREMENT 2 screen. Instead, it tracks the peak current
on a cycle-by-cycle basis. The INST PK CURR typically tracks
the rms current and the crest factor.
Update Program Functions from Measurement Screen
The Shuttle can be used to update program parameters such as voltage, frequency or current
from the measurement screen. This can be achieved with the following sequence:
1. Select the program 1 screen using the PROG key.
2. Use the up and down key to select the desired function to update. (Selects parameter that
will be changed by the shuttle once in the MEAS1 screen)
3. Select the measurement 1 screen by pressing the MEAS key.
4. The pointer symbol ( ) points to the programmed parameter (V, F or CL) that will be
affected by turning the shuttle.