31Wattmeters
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■ Single-phase characteristics
Display range 1000 VA 6 kVA
Measuring range 10.0 VA...999.9 VA 1000 VA...5999 kVA
Accuracy at 50 Hz for cos ϕ =0.6 2%% of reading ±2 cts 2% of reading ±2 cts
Resolution 0.1 VA 1 VA
The measurement is only accurate for sinusoidal signals
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■ Three-phase characteristics
Range 1000 VA 6 kVA
Specified measurement range 10.0 VA...999.9 VA 1000 VA...5999 kVA
Accuracy at 50 Hz for sin φ ≥ 0.6 3% of reading ±2 cts 3% of reading ±2 cts
Resolution 0.1 VAR 1 VAR
The three-phase measurement includes the harmonic and inter-harmonic powers up to 1 kHz
3.4.5 Measurement of the power factor (PF)
1. Press the ON/OFF key: the first screen appears.
2. Connect the measurement leads to the instrument’s current measurement terminals
(on the left), complying with the polarities indicated: red lead on the “+” terminal and
black lead on the “COM” terminal.
Connect the measurement leads to the instrument’s voltage measurement terminals
(on the right), complying with the polarities indicated: red lead on the “+” terminal
and black lead on the “COM” terminal.
3. Set up as indicated in the connection diagrams in Fig.4.4.1 or Fig.4.4.2 (T3FE only
PX 120), depending on the case, making sure if possible that the maximum
acceptable limits are not exceeded (see table below). Range switching is automatic.
4. Press the DISPLAY key to display the 2nd screen:
- the lower display indicates the power factor and the symbol PF is displayed.
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■ Characteristics
Display range 1.00
Measuring range 0.00 - 0.20 0.21 - 0.50 0.51 - 1.00
Accuracy 10% ± 2 cts 5% ± 2 cts 3% ± 2 cts
Resolution 0.01
Note 1: The power factor display is limited to à 1.00 and remains undetermined
“ - - - ” when S < 5 VA or S = OL.
Note 2: The power factor measurement is not a signed measurement.
Chapter III
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