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Fluke 434-II/435-II/437-II
Users Manual
27-8
Harmonics Calculated from 10/12-cycle gapless harmonic group measurements on
Voltage and Amps according to IEC 61000-4-7
Watt Full and 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 Full and fundamental apparent power display. Calculates apparent power
using Vrms x Arms value over 10/12 cycle period.
var Fundamental reactive power display. Calculates reactive power on
fundamental positive sequence components. Capacitive and inductive load is
indicated with capacitor and inductor icons.
VA Harmonics Total disturbance power due to harmonics. Calculated for each phase and for
total system based upon total aparent power and fundamental real power.
VA Unbalance Unbalance power for total sytem. Calculated using symetrical components
method for fundamental apparent power and total apparent power.
Power Factor Calculated Watt / VA
Cos ϕ Cosine of angle between fundamental voltage and current
DPF Calculated fundamental Watt/VA
Energy / Energy Cost Power values are accumulated over time for kWh values.
Energy cost is calculated from user defined /kWh cost variable
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 230 V / 50 Hz lamp and 120 V / 60 Hz lamp models.
Transient capture Captures waveform triggered on signal envelope. 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.
Mains Signaling Measurements are based on: either the corresponding 10/12-cycle rms value
interharmonic bin or the rms of the four nearest 10/12-cycle rms value
interharmonic bins per IEC 61000-4-30.
Limit setup for Monitor mode follows EN50160 standard limits.
Time Synchronisation Optional GPS430-II timesync module provides time uncertainty ≤ 20 ms or ≤
16.7 ms for time tagging of events and time aggregated measurements. When
synchronization is not available, time tolerance is ≤ 1 s/24h.
1.888.610.7664 sales@GlobalTestSupply.com
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