User manual

31Wattmeters
Press the DISPLAY key to display the 2nd screen:
-the upper digital display indicates the value of the reactive power and the
corresponding unit (VAR).
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■ Characteristics
Display range 1000 VAR 6 kVAR
Measuring range 10.0 VAR...999.9 VAR 1000 VAR...5999 kVAR
Accuracy 2% of reading ±2 cts 2% of reading ±2 cts
Resolution 0.1 VAR 1 VAR
Display stability 5 counts in normal mode
2 counts in SMOOTH mode
Response time 400 ms in normal mode
of the display 3 s in single-phase in SMOOTH mode
Note 1: The measurement of the reactive power is a signed measurement.
Above 6 kVAR +10%, the display indicates “OL”.
Note 2: In three-phase, for non-sinusoidal signals, the measurement may be
additionally inaccurate.
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
Response time 400 ms in NORMAL mode
of the display 3 s in SMOOTH mode
Display stability 2 counts
Note 1: The measurement is valid in all 4 quadrants
Below 10 W, the measurement is not guaranteed
Note 2: The power measurement is not a signed measurement.
3.5 Communication (option)
The wattmeters are equipped with a two-way RS 232C communication channel.
Communication takes place via an optical head and the following functions are available:
Chapter III