Characteristics Of The Measurements Of The Current Flowing In The Resistance Measured; Power Supply - Chauvin Arnoux C.A 6240 Manual De Instrucciones

6.4. CHARACTERISTICS OF THE MEASUREMENTS OF THE CURRENT
FLOWING IN THE RESISTANCE MEASURED
Measurement range
Resolution
Accuracy ± 0,5% ± 2 pt
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 mW 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 mA 100 mA
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
9
0,400 – 4,00 –
3,999 A 11,00 A
1 mA 10 mA
± 0,5% ± 1 pt
Variation of the measurement
Typical
0,1 %/10 °C 0,5 %/10 °C + 2pt
0,1 %
2 pt 0,2%/ V + 2pt
< 0,2%
> 80 dB
Maximum
0,5 % + 2pt
2% + 1pt
> 60 dB