SECTION 4 OPERATION
46
4.5.2 TRANSIENT EDITING (continued)
WFa, WFb, WFc: Select the desired output waveform. Waveform 1 is always a sine wave.
Waveform 2-16 may be copied and/or edited as desired using the SETUP (fn) functions.
Depending on the TRANSIENT AUTO RMS setting for this program, the UPC may attempt to
generate the selected waveform at the rms voltage programmed at the beginning of each segment.
Because of the difference in the rms voltage content of various waveforms the UPC may not be
able to reproduce the waveform at the voltage desired. If the waveform is peak-voltage-limiting,
then selecting transformer coupled output with a higher ratio may solve this problem.
TRANSIENT EVENTS: Enter the number of times you wish the transient to repeat. 0 causes the transient
to repeat continuously, until the TRANS key is pressed again.
TRANSIENT AUTO RMS: Sets the mode for calculation of waveform amplitude.
AUTO RMS=ENABLED, causes all transient voltages to be calculated as true RMS voltage of the
waveforms used in any Segment of the Transient.
AUTO RMS=DISABLED, RMS calculation of substituted waveforms does not occur. The amplitude
of all waveforms used in the transient will be based on the system gain factor for each
phase, as calculated for the Program which contains the transient.
4.5.2.1 TIME BASED TRANSIENT EXAMPLE
The following is an example of how to create a MIL-STD-704D time-based transient. See (4.4.2) regarding
pre-stored transients.
Start with the previous program #4 example as shown in (4.5.1). From any metering display press
PROGRAM, 4, ENTER, EDIT, EDIT, and you should see the following display:
TRANSIENT: PRGM #4 SEGMENT #1 OF 1
T=0.0002 Va=108 Vb=108 Vc=108
F=400 WFa=1 WFb=1 WFc=1
Press 1, ENTER, ENTER, to select segment 1 of 1.
TRANSIENT: PRGM #4 SEGMENT #1 OF 1
T=0.0002 Va=108 Vb=108 Vc=108
F=400 WFa=1 WFb=1 WFc=1
Press .0002, ENTER, to select a time of .0002 seconds. This is the smallest time allowed for a time based
transient segment.
TRANSIENT: PRGM #4 SEGMENT #1 OF 1
T=0.0002 Va=108 Vb=108 Vc=108
F=400 WFa=1 WFb=1 WFc=1
Press 80, ENTER, 80, ENTER, 80, ENTER, to select 80 volts on all three phases.
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