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Benning CM11.0 Manual

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11/ 2014
BENNING CM 11
12
7.6 Continuity test
Open circuit-voltage: approx. 3 V, max. Testing current 1 mA
The built-in buzzer sounds when resistance is less than 100 Ω.
8. Measuring with the BENNING CM 11
8.1 Preparing the measurement
Operate and store the BENNING CM 11 at the specified storage and operating temperatures
only! Do not permanently expose the device to sunlight.
- 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 11.
- Check the insulation of the safety measuring lead. If the insulation is damaged, the
BENNING CM 11 must be scrapped immediately.
- Check the continuity of the safety measuring leads. If the leads is discon nected at any point,
remove it immediately.
- Before - at the rotary switch
5
a different function is selected, the safety measuring leads
must be disconnected from the measuring point.
- Strong sources of interference in the vicinity of the BENNING CM 11 might involve unsta ble
readings and measuring errors.
8.2 Voltage measurement
Do not exceed the maximum permitted voltage with respect to earth potential!
Electrical danger!
The maximum voltage which may be applied to the sockets
- COM socket, black J,
- V- Ω socket (positive) K for voltage and resistance measurements and continuity testing
(marked red)
of the BENNING CM 11 against ground, amounts to 300 V.
- Use the rotary switch
5
to select the required function V or V on the BENNING CM 11.
- The black safety measuring lead has to be contacted with the COM jack J on the
BENNING CM 11.
- Connect the red safety measuring lead to the V-Ω jack K, marked in red.
- Bring the safety measuring leads into contact with the measuring points, read off measured
value on the digital display
9
on the BENNING CM 11.
Note:
- In small voltage measuring ranges, the zero-volt indication does not appear (due
to interference) when the safety measuring leads are open. Make sure that the
BENNING CM 11 is fully functional by short-circuiting the measuring tips.
See figure 2: DC voltage measurement
See figure 3: AC voltage measurement
8.3 Current measurement
Do not apply any voltage to the input jacks J and K of the BENNING CM 11!
Any possibly connected safety measuring leads have to be removed. For
direct current (DC) measurements, observe correct polarity! The arrow on the
measuring clamp indicates the technical current direction. +
→ –
-
Use the rotary switch
5
to select the required function A or A on the BENNING CM 11.
- Press the “ZERO” button
6
to set the BENNING CM 11 to the starting point.
- Operate opening lever
, clamp
single wire live conductor centrally by means of the
BENNING CM 11 current probe.
- Read off the digital display unit
9
.
See figure 4: AC/ DC current measurement
8.4 Resistance measurement
- Select the / Ω function by means of the rotary switch
5
of the BENNING CM 11 and press
the „MIN/MAX“ key
7
.
- The black safety measuring lead has to be contacted with the COM jack J on the
BENNING CM 11.
- Connect the red safety measuring lead to the V-Ω jack K, marked in red.
- Bring the safety measuring leads into contact with the measuring points, read off measured
value on the digital display
9
on the BENNING CM 11.
Note:
- To obtain a correct measurement, ensure that no voltage is applied to the measuring point.
… 17 …


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