Environmental Conditions; Electrical Specifications; Measuring With Benning Cm; Measurement Preparation - Benning CM 3 Bedienungsanleitung

5.1.4 The measuring rate for the numerical display of the BENNING CM 3 is a
nominal 2.5 readings per second rate.
5.1.5 The BENNING CM 3 powers off automatically after approx. 30 minutes.
It can be powered on again by pushing switch 7 .
5.1.6 Sensor type: Hall sensor for direct and alternating current.
5.1.7­ Temperature­coefficient­of­the­measurement­reading:­
0.2 x (given accuracy)/ °C , < 18 °C or > 28 °C.
5.1.8 The BENNING CM 3 is powered by one 9-V block battery (IEC 6 LR 61).
5.1.9 When the battery voltage drops below the operating voltage of the
BENNING CM 3 a low battery symbol appears in the display.
5.1.10 The lifespan of the battery is approx. 40 hours (Alkaline battery).
5.1.11 Maximum jaw opening: 44 mm
5.1.12 Maximum conductor diameter size: 34 mm
5.1.13 Meter dimensions: (L x W x H) = 203 x 81 x 39 mm
Meter weight: 320 g
5.1.14 Operating manual
6.

Environmental conditions

- The BENNING CM 3 is designed for measuring only in dry conditions,
- Altitude during measuring: 2000 m maximum
­­ Overvoltage­ category/­ Location­ category:­ IEC­ 60664­1/­ IEC­ 61010­1­ →­
300 V category III, 600 V category II,
- Pollution degree: 2,
- Protection Class: IP30 (DIN VDE 0470-1 IEC/ EN 60529)
IP 30 means: Protection against access to dangerous parts and protection
against­solid­impurities­of­a­diameter­>­2.5­mm,­(3­­­first­index).­No­protection­
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
­ ­­ the­number­of­least­significant­digits­
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
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to earth ground!
09/ 2013
Resolution
0.1 A
1 A
Resolution
0.1 A
1 A
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
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