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Fluke 434-II/435-II/437-II
Users Manual
15-2
e
ENTER
f
F3
Use the arrow keys in the Start menu to adjust the trigger limits: expected inrush time,
nominal current, threshold, and hysteresis. The maximum current determines the vertical
height of the current display windows. Threshold is the current level that triggers the
trend capture. The screen header displays the rms of all rms values during the inrush
time. If the Cursor is on, the rms measuring values at the Cursor are displayed. A Meter
screen shows half cycle rms for voltage (Vrms ½) and current (Arms ½).
Set the duration to a value higher than the expected inrush duration to assure that the
event is completely captured. Duration is selectable from 1 to 45 minutes.
The inrush starts when the Arms ½ of one of the phases is higher than the threshold. The
inrush ends when the Arms ½ is lower than the threshold minus the hysteresis. The inrush
duration is indicated with markers on screen and shown as a duration reading in the
Trend screen. The inrush value is the rms value between the markers and is measured on
each phase simultaneously.
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