YOKOGAWA WT500 User Manual page 310

Item
Line filter influence
Temperature coefficient
One year accuracy
Accuracy when the crest
factor is set to 6
Other Computation and Measurement Accuracies
IM 760201-01E
Specifications
When the cutoff frequency is 500 Hz
45 to 66 Hz: Add 0.3% of reading. Less than 45 Hz: Add 1% of reading.
When the cutoff frequency is 5.5 kHz
66 Hz or less: Add 0.4% of reading. 66 to 500 Hz: Add 1.2% of reading.
Same as the temperature coefficients for the voltage and current.
Reading error of accuracy at 6 months × 1.5.
Same as the accuracy when the crest factor is 3 after doubling the measurement range.
• Accuracy of apparent power S
• Accuracy of reactive power Q
• Accuracy of power factor λ
• Accuracy of phase difference
• For the accuracies of frequencies fU and fI, see "Frequency Measurement" in section 14.6,
"Functions."
• For the accuracies of integrated values WP, WP+, WP–, q, q+, and q– and the integration time
(Time), see "Integration" in section 14.6, "Functions."
• For the accuracies of voltage, current, and power during harmonic measurement, see "Harmonic
Measurement" in section 14.6, "Functions."
Voltage accuracy + current accuracy
Accuracy of apparent power + (
100% of range
±[( λ – λ /1.0002) + |cos f – cos{
λ
power factor when = 0%/100)}|] ± 1 digit
when voltage and current are at the measurement range rated
input.
f ±[| f – cos – 1( λ /1.0002)| + sin – 1{(influence from the power
factor when λ = 0%)/100}] deg ± 1 digit
when voltage and current are at the measurement range rated
input.
14.5 Accuracy
) –
(1 – 2 ) ) ×
(1.0004 – 2
f + sin – 1(influence from the
14-9
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App
Index