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Fluke 434-II/435-II/437-II
Users Manual
8-4
Available function keys:
F1
Switch to wave event display: this will show a scope
waveform around the selected event. Available in Fluke
435-II and 437-II.
F2
Switch to rms event display: this will show the ½ cycle rms
trend around the selected event. Available in Fluke 435-II
and 437-II.
F3
Switch between NORMAL and DETAILED event table.
F4
Return to Trend screen.
Tips and Hints
Voltage and frequency should be close to the nominal values of for example 120 V,
230 V, 480 V, 60 Hz, or 50 Hz.
The voltages and currents in the Meter screen can e.g. be used to check if power applied
to a 3-phase induction motor is in balance. Voltage unbalance causes high unbalanced
currents in stator windings resulting in overheating and reduced motor life. Each of the
phase voltages should not differ more than 1 % from the average of the three. Current
unbalance should not exceed 10 %. In case of too high unbalance, use other measuring
modes to further analyze the power system.
A Crest Factor close to 2.0 indicates high distortion. CF = 2.0 can e.g. be found if you
measure the current drawn by rectifiers that only conduct at the sine wave top.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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