Extech Instruments PQ3470 User Manual page 27

Harmonics - Screen 3– Voltage phase 1 – High range (VH)
Harmonics - Screen 4– Amps phase 1 – High range (AH)
Harmonics Display Definitions:
CFA Crest Factor Amps – Ratio of Peak value to RMS value
CFV Crest Factor Voltage – Ratio of Peak value to RMS value
Pk-Pk Peak to Peak valuie of voltage or amperage
AH/AL Amps – High Range or Low range (adjust size of displayed waveform)
VH/VL Volts – High range or Low range (adjust size of displayed waveform)
THD Total Harmonic distortion - The ratio of the sum of the powers of
all harmonic components to the power of the fundamental frequency.
H01 Fundamental or 1
rd
H03 3 harmonic – percentage is based on ratio to fundamental signal
3.0° Phase angle of the harmonic frequency
V1 Voltage for Phase 1 is displayed
A1 Amperage for phase 1 is displayed
FREQ Line frequency being measured
1200/20A Clamp model and range setting
3Φ4W 3 phase, 4-wire
st
harmonic – should equal 100% of measured value
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