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6-7
CH 6/ Advanced Setup Options
Procedure to
record transient
disturbance
(continued)
Continued on next page
Action... Result...
STEP 3 (continued):
• Enable toggles whether this
limit is enabled or disabled.
• Amps toggles between Volts
and Amps.
•Press Group A B C to set
identical waveform threshold
duration values for Channels A,
B and C.
•Press Next to set the rms
distortion waveshape limit.
Proceed to Step 4.
•Press Prev to return to the high
frequency transient screen.
•Press Cancel to retain previous
threshold duration and return to
Advanced Options menu.
NOTE: The figure above helps illustrate the
“floating window” algorithm used for waveshape
fault detection. This window is visualized on screen
as sliding along a waveform, precisely one cycle
behind the previous sample point, v
i
. The height of
the window defines a maximum allowable voltage
deviation in magnitude. The width of the duration
corresponds to a number of sample points, N. For
each sample v
i
, when compared to v
i-1 cycle
where
the deviation in magnitude is outside the maximum
allowable deviation, a counter is incremented. For
each sample v
i
that is within the maximum
allowable deviation, the counter, if greater than 0, is
decremented. If the count reaches N, a trigger
occurs.
STEP 4: PX5 allows users to set
rms distortion waveshape limit.
• Press the limit field to change
limit. Use the keypad to enter
the treshold limit beyond which
rms voltage variations occur.
• Enable toggles whether this
limit is enabled or disabled.
• Amps toggles between Volts
and Amps.
•Press Group A B C to set
identical rms threshold value
for Channels A, B and C.
•Press Next to set the transient
waveform capture pre- and
post-cycles setup. Proceed to
Step 5 on page 6-8.
MARK112_105
Present
Cycle
Previous Cycle
with Floating Window
Trigger
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