26 Wattmeters
2.2.2 Display of the function symbols
HOLD Indicates use of the corresponding key (see § 2.1)
SMOOTH Indicates use of the corresponding key (see § 2.1)
Indicates that communication is activated (see § 3.6)
T3FE Indicates use of the corresponding key for three-phase/balanced wires
measurement (only on PX 120)
Indicates that the remaining battery charge life is < 4 hours
INRUSH Indicates use of the corresponding key for peak start-up current measurement
(see § 2.3)
2.3. INRUSH function
This function can be used to follow rapid, damped sinusoidal evolution of the current by
measuring the successive RMS values calculated over a half-period and updated over a
half-period.
The applications are:
- Measurement of motor start-up currents
- Correct definition of fuses and circuit breakers (signal amplitude-time relationship)
- Stress on components by current overload
The field of application is limited to industrial frequencies (40 Hz... 70 Hz).
3. IMPLEMENTATION - FUNCTIONAL CHARACTERISTICS
The instrument is activated and shut down by pressing the ON/OFF key (long press for
shutdown); it shuts down automatically if it is not used for 10 minutes.
Input and output in each of the functions is performed by successive brief presses in the
keys concerned.
When the instrument is switched on, all the segments are lit up for 1 second.
Do not connect any voltages exceeding 600 V in relation to the earth
3.1. Reference conditions
The functional characteristics are guaranteed in the following reference ranges:
- Temperature: +23°C ± 3°C
- Humidity: 45% to 80% RH
- Supply voltage: 9 V ±0.1V
- Frequency range: DC, 50 Hz ±3 Hz sinusoidal (THD < 0.1%)
- DC magnetic field: < 40 A/m (earth field)
- No external AC magnetic field
- No electrical field
Note: There are reference conditions specific to each function: these will be indicated in
the characteristics of each function.
Chapter III
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