Bedienungsanleitung Benning CM7 (Seite 19 von 117) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch, Polnisch, Türkisch, Schwedisch)

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09/ 2013

BENNING CM 7



200 - 400 A 0,1 A ± (1.9 % of the measuring value + 2 A) 1000 A

eff

within the frequency

range 50 Hz - 200 Hz

400 - 1000 A 1 A ± (2.9 % of the measuring value + 5 A) 1000 A

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

The stated precision is specified for conductors that are centrally clamped by

the current probe  (see Fig. 4 Direct/ alternating current measurement). For

conductors that are not centrally clamped, an additional error of 1 % of the

display value needs to be taken into account.

7.5 Resistance measuring range and acoustic continuity testing

Overload protection: 600 V

eff

Meas. range Resolution Meas. precision Max. idling voltage

400 Ω 0,1 Ω ± (1 % of the measuring value + 3 digits) 3 V

The built-in buzzer sounds in the case of a resistance R less than 30 Ω.

7.6 Frequency ranges

Overload protection: 1000 A

eff

Meas. range Resolution Meas. precision

400 Hz 1 Hz ± (1 % of the measuring value + 2 digits)

Minimum input frequency: 20 Hz

Minimum input sensitivity: 3 A

eff

7.7 PEAK HOLD

Measuring ranges: V AC, A AC

In the PEAK-HOLD function (storage of the peak value), an additional error has

to be considered for the specified accuracy:

+ (± 3 % + 20 digits)

Measuring values > 750 Vpeak or 800 Apeak are not specified.

The PEAK-HOLD function automatically selects the measuring range with the

lowest resolution.

7.8 MIN/MAX

In the MIN/MAX function (storage of the minimum/ maximum value), an addi-

tional error has to be considered for the specified accuracy:

+ (± 15 digits)

The MIN/MAX function automatically selects the measuring range with the

lowest resolution.

8. Making measurements with the BENNING CM 7

8.1 Preparations for making measurements

Operate and store the BENNING CM 7 only at the specified storage and

operating temperatures conditions. Avoid continuous insulation.

- Check rated voltage and rated current details specified on the safety meas-

uring lines. The nominal voltage and current ratings of the safety measuring

cables included in the scope of delivery correspond to the ratings of the

BENNING CM 7.

- Check the insulation of the safety measuring cables. Discard the safety

measuring cables immediately if the insulation is damaged.

- Check safety measuring lines for continuity. If the conductor in the safety

measuring line is interrupted, the safety measuring line must be quaran-

tined immediately.

- Before - at the rotary switch  a different function is selected, the safety

measuring lines must be disconnected from the measuring point.

- Strong sources of interference in the vicinity of the BENNING CM 7 can

lead to unstable readings and measuring errors.

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