Amprobe DM-II-PLUS Power-Quality-Recorder - Manual (Page 23)

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Power measurement (cosϕ: 0.5c[positive] – 0.5i[negative])
Value Ranges Accuracy Resolution
Active power 0 – 999.9W
1kW – 999.9kW
1MW – 999.9MW
±(1.5%+2digit)
0.1W
0.1kW
0.1MW
Reactive power 0 – 999.9VAR
1kVAR – 999.9kVAR
1MVAR – 999.9MVAR
0.1VAR
0.1kVAR
0.1MVAR
Apparent power 0 – 999.9VA
1kVA – 999.9kVA
1MVA – 999.9MVA
0.1VA
0.1kVA
0.1MVA
Active energy 0 – 999.9Wh
1kWh – 999.9kWh
1MWh – 999.9MWh
0.1Wh
0.1kWh
0.1MWh
Reactive energy 0 – 999.9VARh
1kVARh – 999.9kVARh
1MVARh – 999.9MVARh
0.1VARh
0.1kVARh
0.1MVARh
Cosϕ Measurement
Cosϕ Resolution Accuracy (expressed in degrees)
0 to 0.20
0.01
0.6
0.21 to 0.50 0.7
0.51 to 0.80 1
Measurement of Harmonics
Voltage
Range Accuracy Resolution
DC – 25h
26h – 33h
34h – 49h
±(5.0%+2digit)
±(10.0%+2digit)
±(15.0%+2digit) 0.1V
The voltage harmonics will be null under the following threshold:
- DC: if <1V or <2% of 1st harmonic
- 1st harmonic: if <2V
- 2nd to 49th: if <1V or <2% 1st harmonic
Current
Range Accuracy Resolution
DC – 25h
26h – 33h
34h – 49h
±(5.0%+2digit)
±(10.0%+2digit)
±(15.0%+2digit) 0.1A
The current harmonics will be null under the following threshold:
- DC: if <2% of 1st harmonic or < 0.2% of clamp full scale
- 1st harmonic: if < 0.2% of clamp full scale
- 2nd to 49th: if <2% 1st harmonic or < 0.2% of clamp full scale
Setting the FLEX option the DC component will be ignored.