Manual Benning CM7 (page 18 of 117) (English, German, Dutch, French, Italian, Polish, Swedish, Turkish, Spanish)

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09/ 2013

BENNING CM 7



6. Environment conditions:

- The BENNING CM 7 is intended for making measurements in dry

environment.

- Maximum barometric elevation for making measurements: 2000 m,

- Overvoltage category/ Siting category:

IEC 60664-1/ IEC 61010-1 → 600 V category IV, 1000 V category III

- Contamination class: 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 protec-

tion against water, (0 - second index).

- Operating temperature and relative humidity:

For operating temperature from 0 °C to 30 °C: relative humidity less than 80 %

For operating temperatures from 31 °C to 40 °C: relative humidity less than 75 %

or operating temperature from 41 °C to 50 °C: relative humidity less than 45 %

- Storage temperature: The BENNING CM 7 can be stored at any tempera-

ture in the range from - 20 °C to + 60 °C (relative humidity from 0 to 80 %).

The battery should be taken out of the instrument for storage.

7. Electrical specications

Note: The measuring precision is specified as the sum of

- a relative fraction of the measured value and

- a number of digits (counting steps of the least significant digit).

This specified measuring precision is valid for temperatures in the range from

18 °C to 28 °C and relative humidity less than 80 %.

7.1 Direct voltage ranges

The input resistance amounts to 1 M

Meas. range Resolution Meas. precision Overload protection

400 V 0,1 V ± (0.7 % of the measuring value + 2 digits) 750 V

eff

1000 V 1 V ± (0.7 % of the measuring value + 2 digits) 750 V

eff

7.2 Alternating voltage ranges

The input resistance amounts to 1 M in parallel 100 pF.

Measuring

range

Resolution

Meas. precision *

within the

frequency range 50 Hz - 500 Hz

Overload

protection

400 V 0,1 V ± (1 % of the measuring value + 5 digits) 750 V

eff

750 V 1 V ± (1 % of the measuring value + 5 digits) 750 V

eff

The measuring value is gained and indicated as effective value (True RMS,

AC coupling). The measuring accuracy is specified for sinusoidal curves

and applies to the final value of the measuring range as well as for non-

sinusoidal curves up to 50 % of the final value of the measuring range.

In case of non-sinusoidal curves, the indicating value becomes inaccurate.

Thus, an additional error occurs for the following crest factors:

crest factor from 1.4 to 2.0 additional error + 1 %

crest factor from 2.0 to 2.5 additional error + 2.5 %

crest factor from 2.5 to 3.0 additional error + 4 %

additionally ± 4 digits for measuring values < 15 % of the final value of the

measuring range

7.3 Direct current (DC) ranges

Meas. range Resolution Measuring accuracy Overload protection

0 - 200 A 0,1 A ± (2,9 % of the measuring value + 3 A) 1000 A

eff

200 - 400 A 0,1 A ± (1,9 % of the measuring value + 2 A) 1000 A

eff

400 - 1000 A 1 A ± (2,9 % of the measuring value + 5 A) 1000 A

eff

The indicated accuracy is specified for conductors which are gripped by means

of the measuring clamp  in the middle (see Fig. 4 Direct/ alternating current

measurement). For conductors which are not gripped in the middle, an addi-

tional error of 1 % of the indicating value has to be considered.

Error according to remanence: 1 % (repeating measurement)

7.4 Alternating current ranges

Measuring

range

Resolution

Meas. precision *

1*2

within the

frequency range 50 Hz - 400 Hz

Overload

protection

0 - 200 A 0,1 A ± (2.9 % of the measuring value + 3 A) 1000 A

eff

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Benning CM7 Manual

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