Dranetz PowerVisa, User Manual

Page: 118 / 274

6-4
Transient Limit, continued
Procedure to
record transient
disturbance
PowerVisa uses three different algorithms to detect and record transients:
• Peak or Instantaneous trigger magnitude
• Waveshape threshold duration or window
• Waveshape threshold magnitude or tolerance
Continued on next page
Action... Result...
STEP 1: From the Advanced
Options screen, press Transient
Limit.
• Press the limit field to change
limit. Use the keypad to enter
the instantaneous limit. This
value is compared against the
absolute value of each A/D
sample of the V and I channel
waveforms.
NOTE: Do not set this value to
less than or equal to the peak of
the normal waveform. For a
sinusoidal waveform, the peak
is 1.414 x the rms value.
Failure to do this will result in
continuous triggering.
• Enable toggles whether this
limit is enabled or disabled.
• Amps toggles between Volts
and Amps.
• Press Group A B C to set
identical limit value for
Channels A, B and C.
• Press Next to set the
waveshape threshold duration.
Proceed to Step 2 on page 6-5.
• Press Cancel to discard
changes and return to
Advanced Options menu.
MARK112_101
MARK112_102