13.3 Measurement Specifications
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Chapter 13 Specifications
Measurement items
There are no accuracy specifications where measurement accuracy is not noted or for 3P3W2M CH3 mea-
sured values.
Conditions of Guaranteed Accuracy
Conditions of guaranteed
accuracy
Warm-up time of at least 30 minutes, power factor = 1, common-mode voltage of 0 V, input of at
least 1.666% f.s. to reference channel after zero adjustment
Temperature and humidity for
guaranteed accuracy
235°C (739°F), 80%RH or less (applies to all specifications unless otherwise noted))
Period of guaranteed accuracy 1 year
Fundamental waveform range
for guaranteed accuracy
When measurement frequency is set to 50 Hz : 40 to 58 Hz
When measurement frequency is set to 60 Hz : 51 to 70 Hz
When measurement frequency is set to 400 Hz: 360 Hz to 440 Hz
Display
Total display area Voltage: 0.08% to 130% of selected range (display suppressed to zero when less than 0.08% f.s.)
Current : 0.5% to 130% of the range (Display is suppressed to zero when less than 0.5%.)
Power : 0.1% to 130% of the range (Display is suppressed to zero when less than 0.1%.)
Measurement items other than above: 0% to 130% of the range
Effective measuring range Voltage: 1.666% to 130% of selected AC range (actual input of 10 to 780 V), 0.1666% to 100% of
selected DC range (actual input of 1 to 600 V))
Current : 1% to 110% of the range
Power : 0.15% to 130% of the range (with both voltage and current within valid measurement range)
Note: See separate specifications for harmonic measurement.
Transient overvoltage (Tran)
Measurement method Detected from waveform obtained by eliminating the fundamental component (50/60/400 Hz) from
the sampled waveform. Detection occurs once for each fundamental voltage waveform.
Sampling frequency 2 MHz
Displayed item Transient voltage value : Waveform peak value during 4 ms period after elimination of fun-
damental component
Transient width : Period during which threshold is exceeded (2 ms max.)
Max. transient voltage value : Max. peak value of waveform obtained by eliminating the funda-
mental component during the period from transient IN to transient
OUT (leaving channel information)
Transient period : Period from transient IN to transient OUT
Transient count during period : Number of transients occurring during period from transient IN to
transient OUT (transients occurring across all channels or simul-
taneously on multiple channels count as 1)
RMS transient : For testing purposes
Measurement range, resolution 6.0000k Vpk
Measurement band 5 kHz (-3dB) to 700 kHz (-3dB), specified at 20 Vrms
Min. detection width 0.5 s
Measurement accuracy 5.0% rdg.1.0%f.s. (specified at 1,000 Vrms/30 Hz and 700 Vrms/100 kHz)
Event threshold Set as an absolute value relative to the peak value (crest value) of the waveform obtained by elim-
inating the 6,000.0 V resolution fundamental component
Event IN First transient overvoltage detected in an approx. 200 ms aggregation interval.The event occur-
rence time indicates the peak voltage value and transient width when the threshold was exceeded.
Event OUT Start of approx. 200 aggregation in which no transient overvoltage was detected for any channel
within the first approx. 200 ms aggregation period following the transient event IN state. The tran-
sient period (difference between the IN and OUT times) is indicated.
Multiple-phase system treatment Begins when a transient is detected for any one of the U1 to U4 channels and ends when no tran-
sient is detected for any of the channels.
Saved waveforms Event waveforms, Transient waveforms
Waveforms are saved for 2 ms before and after the position at which the transient overvoltage
waveform was detected for the first transient IN and 2 ms before and after the point at which the
transient maximum voltage waveform was detected between the IN and OUT points.
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