User Manual – Rev BE    AMETEK Programmable Power 
MX Series  117 
POWER  In both AC and DC mode, this value is the real rms. 
power consumed by the load. 
MEASUREMENT 2 
VA POWER  In AC or AC+DC mode, this value is the apparent rms. 
power consumed by the load. In DC mode, this value is 
always the same as the POWER readout. 
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.