Electrical Specifications; Measurement Preparation; Current Measurement - Benning CM 3 Instrucciones De Servicio

- Altitude during measuring: 2000 m maximum
- Overvoltage category/ Location category: IEC 664/ IEC 1010 600 V
Category II,
- Pollution degree: 2,
- Protection Class: IP 30 (DIN VDE 0470-1 IEC/ EN 60529)
IP 30 means: Protection against access to dangerous parts and protection
against solid impurities of a diameter > 2.5 mm, (3 - first index). No
protection against water, (0 - second index).
- Working temperature and relative humidity:
for working temperatures between 0 °C and 50 °C: relative humidity smaller
than 80%
- Storage temperature: the BENNING CM 3 can be stored at temperatures
between - 20 °C and + 60 °C. The battery should be removed when meter
is in storage.
7.

electrical specifications

Note: measurement accuracy is given as the sum of
- a relative percentage of the reading and
- the number of least significant digits
This accuracy is valid for a temperature of 23 °C, with a relative humidity smaller
than 75 %.
7.1 Direct current ranges
Accuracy is ± (% of reading + number of digits) at a temperature of 23 °C
± 5 °C.
Measuring range
200 A
600 A
7.2 Alternating current ranges
Accuracy is ± (% of reading + number of digits) at a temperature of 23 °C
± 5 °C.
Measuring range
200 A
600 A
8. Measuring with BeNNING CM 3

8.1 Measurement preparation

The BENNING CM 3 must be used and stored only at the indicated storage and
working temperatures, avoid exposure to continuous sunlight.
- If the BENNING CM 3 is used near strong noise generating sources, the
display may become unstable and measurement errors may arise.

To avoid electrical shock, observe the maximum rated voltage
to earth ground!
The maximum rated voltage that should be applied between the BENNING CM 3
and earth ground is 600 V.

8.2 Current measurement

- Use switch  to select the current type and switch  to select the range
on BENNING CM 3.
- Before DC current measurements turn adjusting knob  on the
CM 3 to obtain reading of "0" on the display .
- Press the trigger button  to open the clamp jaws and clamp one single
lead conductor.
- Read the measurement value from the digital display .
see Figure 2:
see Figure 3:
9. Maintenance

Remove test leads and turn the power off before opening the
BeNNING CM 3! Dangerous voltage!
06/ 2008
Resolution
0,1 A
1 A
Resolution
0,1 A
1 A
DC current measurement
AC current measurement
BENNING CM 3
Measurement accuracy
0 - 20 A ± (1,9 % of reading + 5 digits)
20 - 200 A ± (1,9 % of reading + 3 digits)
200 - 600 A ± (1,9 % of reading + 3 digits)
Measurement accuracy
0 - 20 A ± (1,9 % of reading + 7 digits)
20 - 200 A ± (1,9 % of reading + 5 digits)
for frequency range 40 - 400 Hz
200 - 600 A ± (1,9 % of reading + 5 digits)
for frequency range 40 - 400 Hz

BENNING
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