Dranetz PowerGuide 4400 User Manual page 118

Transient Limit, continued
Procedure to
record transient
disturbance
6-4
1.800.561.8187
The 4400 uses three different algorithms to detect and record transients:
• Peak or Instantaneous trigger magnitude
• Waveshape threshold duration or window
• Waveshape threshold magnitude or tolerance
Action...
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.
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