User Manual

6.5. INFLUENCES ON THE RESISTANCE MEASUREMENT

Quantities of inﬂuence Range of use

Variation of the measurement

Typical Maximum

Temperature -10 to + 55 °C 0,1 %/10 °C 0,5 %/10 °C + 2pt

Relative humidity 10 to 85 % RH @ 45°C 0,1 % 0,5 % + 2pt

Supply voltage 5 to 7 V 2 pt 0,2%/ V + 2pt

Series mode rejection, 50/60

Hz (1)

U (AC) = (Rmeasured x I

measurement)

< 0,2% 2% + 1pt

Common mode rejection, 50/60

Hz AC

0 to 50 V AC > 80 dB > 60 dB

(1) Example: If the measured resistance is 1 mΩ 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.

The battery life depends on the ranges used

Number of measurements (1)

10 A range 850

1 A range 3 500

100 mA range 4 500

10 mA range 5 000

Instrument on standby or off battery life 4 to 6 months

(1) established for measurements lasting 5s, every 25s.

6.7. ENVIRONMENTAL CONDITIONS

Use indoors or outdoors.

Range of use - 10 to +55 °C 10 to 85 % RH

Storage (without battery) - 40 to +70 °C 10 to 90 % RH

Altitude < 2000 m

Degree of pollution 2

For long-term storage (2 years) with the battery, conditions must not depart from the range -20 to +30°C and 85% RH; otherwise,

the battery life will be degraded. For short-term storage (1 month), the temperature can reach 50°C.