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Specifications
Electrical Measurements23
23-11
MEASUREMENT METHOD
Vrms, Arms 10/12
2
or 150/180 (selectable) cycle contiguous non overlapping intervals using
500/416
2
samples per cycle in accordance with IEC 61000-4-30
Vpeak, Apeak Absolute highest sample value within 10/12
2
cycle interval with 40µs sample
resolution
V Crest Factor Measures ratio between the Vpeak and Vrms
A Crest Factor Measures ratio between the Apeak and Arms
Hz Measured every 10 sec in accordance with IEC61000-4-30
Vrms½ ,Arms½ Value is measured over 1 cycle, commencing at a fundamental zero crossing,
and refreshed each half-cycle. This technique is independent for each channel
in accordance with IEC 61000-4-30.
Harmonics Calculated from 10/12-cycle gapless harmonic group measurements on
Voltage and Amps according to IEC 61000-4-7
Watt Selectable Total or Fundamental real power display
Calculates average value of instantaneous power over 10/12 cycle period for
each phase Total Active Power P
T
=P
1
+ P
2
+ P
3
VA Selectable Total or Fundamental apparent power display
Calculates apparent power using Vrms x Arms value over 10/12 cycle period
Total Apparent Power is root mean square of real and apparent power
VAR Selectable Total of Fundamental reactive power display
Calculates reactive power as root of VA squared minus Watt squared over
10/12 cycle period. Capacitive and inductive load is indicated with capacitor
and inductor icons
Power Factor Calculated Watt / VA
Cos ϕ / DPF Cos of angle between fundamental voltage and current
Unbalance The supply voltage unbalance is evaluated using the method of symmetrical
components according to IEC61000-4-30
Flicker According to IEC 61000-4-15 Flickermeter - Functional and design
specification. Includes 230V 50Hz lamp and 120V 60Hz lamp models
Transient capture Captures waveform triggered on wave shape. Additionally triggers on dips,
swells, interruptions and Amps level as specified by IEC61000-4-30
Inrush current The inrush current begins when the Arms half cycle rises above the inrush
threshold, and ends when the Arms half cycle rms is equal to or below the
inrush threshold minus a user-selected hysteresis value. The measurement is
the square root of the mean of the squared Arms half cycle values measured
during the inrush duration. Each half-cycle interval is contiguous and non-
overlapping as recommended by IEC 61000-4-30. Markers indicate inrush
duration. Cursors allow measurement of peak Arms half cycle.