Hioki PW8001-01, Instruction Manual

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Calculation of the Combinatorial Accuracy
11.5 Calculation of the Combinatorial Accuracy
If the combinatorial accuracy of PW8001 (U7001, U7005) and the sensor is not specified
The measurement accuracy for the active power and current are the sum of the accuracy of the
instrument and the current sensor to be used. For example, measurement accuracy of active power
can be calculated from the following equations:
(Reading accuracy) = (Reading accuracy of active power) + (Reading accuracy of sensors)
(Range accuracy) = (Range accuracy of active power) + [(Sensor’s rated current) / (Current range)]
×
(Full-scale accuracy of sensor)
Sensor CT6862 (rated current: 50 A), accuracy
±
0.05% of reading
±
0.01% of full scale
Instrument
setting
Power range: 6.00000 kW, accuracy
±
0.02% of reading
±
0.03% of range
Wiring: 1P2W
Voltage range: 600 V
Current range: 10 A
Object under
measurement
400 V, 5 A, 2.00000 kW, 50 Hz
Reading accuracy = 0.02% of r0.05% of reading =
±
0.07% of reading
Range accuracy = 0.03% of range + (50 A / 10 A)
×
0.01% of full scale =
±
0.08% of range
The accuracy for active power is
±
0.07% of reading and
±
0.08% of range (with power range 6 kW).
HIOKI PW8001A961-00