Chauvin Arnoux C.A 6240 Manual De Instrucciones página 41

6.4. CHARACTERISTICS OF THE MEASUREMENTS OF THE CURRENT
FLOWING IN THE RESISTANCE MEASURED
Measurement range
Resolution
Accuracy
6.5. INFLUENCES ON THE RESISTANCE MEASUREMENT
Quantities of influence
Temperature
Relative humidity
Supply voltage
Series mode rejection, 50/60
Hz (1)
Common mode rejection, 50/60
Hz AC
(1) Example: If the measured resistance is 1 m: and the measurement current is 10 A, an alternating
voltage of 1 mV RMS in series with the resistance to be measured will induce an error of not more than 2%.
6.6. POWER SUPPLY
The instrument is powered by a rechargeable 6 V 8.5Ah NiMH battery pack. This has many
advantages :
„ long life with small size and weight,
„ the possibility of recharging your battery rapidly,
„ a very small memory effect: you can recharge your battery rapidly, even if it is not fully discharged,
without reducing its capacity,
„ protection of the environment: no polluting materials such as lead or cadmium.
The NiMH technology allows a limited number of charging/discharging cycles. The number depends
on the conditions of use and on the charging conditions. Under optimum conditions, the number of
cycles is 200.
The instrument has 2 charging modes:
„ rapid charging: the battery recovers 90% of its capacity in 3h;
„ maintenance charging: this mode cuts in when the battery is very low and at the end of rapid
charging.
5,00 – 40,0 –
39,99 mA 399,9 mA
10 PA 100 PA
± 0,5% ± 2 pt
Range of use
-10 to + 55 °C
1 0 t o 8 5 % R H @
45°C
5 to 7 V
U (AC) = (Rmeasured x
I measurement)
0 to 50 V AC
0,400 –
3,999 A
1 mA
± 0,5% ± 1 pt
Variation of the measurement
Typical
0,1 %/10 °C
0,1 %
2 pt
< 0,2%
> 80 dB
41
4,00 –
11,00 A
10 mA
Maximum
0,5 %/10 °C + 2pt
0,5 % + 2pt
0,2%/ V + 2pt
2% + 1pt
> 60 dB