User Manual – Rev BE AMETEK Programmable Power
MX Series 162
Figure 4-32: Selecting a Waveform
The square wave provides a high frequency content waveform with relative fast
rise and fall times. Due to AC amplifier bandwidth limitations, the frequency
content of the standard square wave has been kept within the amplifier’s
capabilities. As the fundamental frequency is increased, the relative contribution
of higher harmonics is reduced.
The clipped sine wave may be used to simulate voltage distortion levels to the
unit under test. The total harmonic distortion level may be programmed in
percent using the CLIP LEVEL field of the WAVEFORMS menu. Changing the
distortion level of the CLIP waveform forces the AC source to regenerate the
CLIPPED sine wave’s data points and reload the waveform register with the
newly requested data. This process requires the output to be dropped briefly. To
avoid interrupting the voltage output to the unit under test, select a different
waveform such as the standard sine wave first, change the clip level and change
the waveform back to the CLIPPED sine wave. This will avoid any output
interruption.
4.4.2 Phase Selection
Figure 4-33: Selecting Waveforms for Single Phase or All Phases
Different waveforms may be selected for each phase. The number of custom
waveforms from which to select remains 50 but each phase can be assigned a
different custom or standard waveform. The specific output phase for which the
wave shape is programmed is selected with the PHASE key on the front panel.
The selected phase is always shown in the top right-hand corner of the
WAVEFORMS display.
To select the same wave shape for all three phases in a three-phase
configuration, press the PHASE key until the “øABC” enunciator appears in the
top right corner of the WAVEFORMS menu. Waveform selections made in this
mode will apply to all three phases.
4.4.3 Creating Custom Waveforms
The 3Pi controller provides four groups of 50 custom defined waveforms each
for a total of 200 waveforms in addition to the 3 standard waveforms. Of these
four groups, one may be active at a time. The active group is selected in the
INITIAL SETUP menu.
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