Transients; Introduction - Fluke 434-II User Manual

Chapter 18

Transients

Introduction

Fluke 435-II and 437-II can capture waveforms at high-resolution during a variety of
disturbances. The Analyzer will give a snapshot of the voltage and current waveforms at
the precise time of the disturbance. This allows you to see the waveforms during dips,
swells, interruptions, current swells and transients.
In Transients mode the Analyzer uses a special setting of its input circuit to allow
capturing signals up to 6 kilovolt in amplitude.
Transients are fast spikes on the voltage waveform. Transients can have so much energy
that sensitive electronic equipment can be affected or even damaged. The Transients
screen looks similar to that of Scope Waveform, but its vertical span is enlarged to make
voltage spikes visible that are superimposed on the 60 or 50 Hz sinewave. A waveform is
captured each time that the voltage (or rms current) exceeds adjustable limits. A
maximum of 9999 events can be captured. The sample rate for transient detection is
200 kS/s.
Transients also has a Meter mode showing half cycle rms for voltage (Vrms ½), current
(Arms ½), and frequency. Also an Events table is available.
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