GE Multilin PQM User Manual

A–12 PQM POWER QUALITY METER – INSTRUCTION MANUAL
TRIGGERED TRACE MEMORY APPENDIX A: APPLICATION NOTES
A.4 Triggered Trace Memory
The Triggered Trace Memory can be used to detect and record system disturbances. The
PQM uses a dedicated continuous sampling rate of 16 samples per cycle to record
fluctuations in voltage or current as per user defined levels. The PQM calculates the true
RMS value of one consecutive cycle, or 16 samples, and compares this value with the user-
defined trigger levels to determine if it will record all sampled waveforms. The sampled
waveforms include Ia, Ib, Ic, In, Va, Vb and Vc.
Since the PQM requires a minimum 20 V for detection and has an upper voltage input limit
of 600 V, the following limitation exists for the Trace Memory undervoltage and
overvoltage trigger levels:
FIGURE A–1: Trace Memory Phase Voltage Trigger Level Limits
0
20
40
60
80
100
120
140
160
0 50 100 150 200 250 300 350 400 450 500 550 600
NOMINAL VOLTAGE (V)
TRIGGER LEVEL AS % OF NOMINAL
Maximum
Minimum
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GE Multilin PQM Specifications

General

Brand	GE
Model	Multilin PQM
Category	Measuring Instruments
Language	English