Chauvin Arnox F 05, Руководство пользователя, Страница: 11 / 23

34
34
Range switching and AC/DC selection are automatic.
Actuate the yellow key to force AC/DC selection manually
if necessary.
■ ■ ■ ■ ■
Correction of the current measurement zero (DC zero)
To measure the low currents, perform a zero correction
first.
- Press and hold the HOLD key until zero appears on the
display. The corrected value will then be memorised and
subtracted from the value of the current measured later.
Note: this correction is performed only on the DC
component of the zero. If the value measured is higher
than 6
Α , this correction is stopped and the memorised
correction value is reset to zero.
■ ■
■ ■ ■
Characteristics
Display range 40 A 400 A 4000 A (1)
Measuring range
(2)
0.20 to 40.0 to 400 to
39.99 A 399.9 A 600 Apeak
Accuracy (3): 1.5% R
1.5% R + 2 pt
+ 10 pt
Resolution 10 mA 100 mA 1 A
(1) In DC, the display indicates +OL above +400 A and -OL
above -400 A (600 A in PEAK mode).
In AC, the display indicates OL over 400 Arms (900 V in
PEAK mode).
(2) In AC, if the value of the current measured is < 0.15 A,
the display shows 0.00.
(3) With correction of zero in DC
- Repeatability of the measurement after several consecutive
closings of the clamp: 0.3% typical
■ ■ ■ ■ ■
MIN/ MAX Mode:
- Accuracy: same as previous table +0.2% R
- Capture time: 100 ms typ.
■ ■ ■ ■ ■
PEAK Mode:
- Accuracy: same as previous table +2% R +0.5 A
- Capture time: 500 µs typ. (2.5 ms max.)
3.7 INRUSH function
■ ■ ■ ■ ■
Description
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