Instructions

APPENDIX
233
Accuracy of apparent
power S
voltage accuracy + current accuracy
Accuracy of reactive power
Q
accuracy of apparent power + (√1.0004 - λ2) - (√1 -
λ2) ×100 %
Accuracy of power factor λ
± [(λ-λ/1.0002)+丨 cosø-cos{ø+sin-1 (influence from
the power factor when λ = 0%/100)}丨] ±1 digit
when voltage and current are at the measurement
range rated input
Accuracy of phase
difference Φ
± [丨 ø-cos-1(λ/1.0002)丨+ sin-1 (influence from the
power factor when λ = 0 % / 100)] ± 1 digit when
voltage and current are at the measurement range
rated input
Accuracy when the crest
factor is set to 6 or 6A
accuracy obtained by doubling the measurement
range error for the accuracy when the crest factor is
set to 3
Accuracy changes caused
by data update interval
When the data update interval is 100 ms, and Auto,
add 0.05% of reading to the 0.1 Hz to 1 kHz
accuracy.
* f is the frequency of input signal in kHz
Voltage, Current and Active Power Measurements
Item
Specifications
Measurement method
Digital sampling method
Crest factor
3 or 6 (6A)
Wiring system
Single-phase , two-wire(1 P2 W)
Range select
Select manual or auto ranging
Auto range
Auto-range increase
The range is upped when any of the following
conditions is met.
Crest factor 3
Urms or Irms exceeds 130% of the
currently set measurement range.
Upk, Ipk value of the input signal
exceeds 300% of the currently set
measurement range.
Crest factor 6
Urms or Irms exceeds 130% of the
currently set measurement range.
Upk, Ipk value of the input signal
exceeds 600% of the currently set
measurement range.
Crest factor 6A
Urms or Irms exceeds 260% of the
currently set measurement range.
Upk, Ipk value of the input signal
exceeds 600% of the currently set
measurement range.