Tips and Hints
Power mode can be used to record apparent power of a transformer over several hours. Look at the
Trend and find out if the transformer is overloaded.
Interpretation of Power Factor when measured at a device:
PF = 0~1:
Not all supplied power is consumed by the device, a certain amount of reactive
power is present. Current leads (capacitive load) or lags(inductive load).
PF = 1:
All supplied power is consumed by the device. Voltage and current are in phase.
PF = -1:
Device generates power. Current leads or lags.
Reactive power (VAR) is most often due to inductive loads such as asynchronous motor, induction
furnace, and transformers, etc.
Installation of correction capacitors can correct for inductive VAR’s.
7.7. Flicker
Flicker quantifies the luminance fluctuation of lamps caused by supply voltage variations. The Analyzer
design strictly meets the IEC61000-4-15 Flicker Meter model. The Analyzer converts duration and
magnitude of voltage variations into an ‘annoyance factor’ caused by the resulting flicker of a 60W lamp.
A high flicker reading means that most people would find the luminance changes irritating. The voltage
variation can be relatively small. The measurement is optimized to lamps powered by 120V/60Hz or
230V/50Hz. Flicker is characterized per phase by the parameters shown in a table. The Trend screen
shows changes of instantaneous flicker sensation level over time.
Table
Flicker is characterized by: short term severity Pst (measured over 10 minutes) and a long term severity
Plt (measured over 2 hours). The Analyzer records severity measured over 1 minute too for fast
feedback. Pst and Plt are parameters showing flicker severity over a certain period of time. Momentary
flicker is shown in the PF5 submenu and is reached via function key
【
F4
】
. Flicker PF5 is displayed as
a fast Trend plot.
Available function keys:
F4
Access PF5 Trend screen.
F5
Switch between RUN and HOLD.
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