Inrush Function; Frequency Measurements (Hz) - Chauvin Arnoux F 07 Notice De Fonctionnement

3.7 INRUSH function

Description
I I I I I
This function is used to follow quick changes in the current,
such as a damped sinusoidal quantity, by measuring the
successive rms values calculated on ½, 1, 2½, 5 and 10
periods from the largest rms value computed and updated
on ½ 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
(15 Hz... 70 Hz)
Implementation
I I I I I
This function is accessible in AC or AC + DC current
measurement, after selection of the MIN/MAX mode.
Action Display
Press 0.5 P then the value
the key for rms
yellow corresponding
out F
Press on 1P-2.5P-5P-10P-0.5P
↑
HOLD key
then press with each time
successively the rms value
the yellow corresponding
key alternately
Short pressure Return to values
on the MIN, MAX or PEAK
MIN/MAX key
Characteristics
I I I I I
- Accuracy: 5% +0.5 A
- Capture time: 10 periods of the signal frequency (200 ms
at 50 Hz)
- Range for use: ≥ 5 A peak for the first period of the signal

3.8 Frequency measurements (Hz)

This function is active only for the A and V functions in AC
(AC or AC + DC ) mode.
1. Perform a short pressing on the Hz key, the display shows
the frequency of the measured signal.
2. Pressing again returns to the previously displayed
measurement.
Comments
Enter the function
Signal frequency
< 15 Hz or > 70 Hz
Consultation of values
rms (computed on
of consecutive periods )
Exit from the function
return to MIN/MAX mode
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