Maintenance - Benning CM 1-3 Instrucciones De Servicio

- Bring the safety measuring lines into contact with the diode connec-
tions and read the measured value on the digital display 3 of the
BENNING CM 1-3.
- For a standard Si diode applied in conduction direction, a conduction
voltage between 0.400 V and 0.900 V is displayed. „000" indicates a short-
circuit inside the diode, „OL" indicates an interruption inside the diode.
- For a diode applied in reverse direction, „OL" is indicated. If the diode is
defective, „000" or other values are indicated.
See figure 6:
8.6 Continuity tests with buzzer
- Select the function (
BENNING CM 1-3 and press the HOLD
- Connect the black safety measuring line to the COM jack 6 of the
BENNING CM 1-3.
- Connect the red safety measuring line to the jack for V, Ω 7 of the
BENNING CM 1-3.
- Bring the safety measuring lines into contact with the measuring points. If
the line resistance between the COM jack 6 and the jack for V, Ω 7 falls
below 50 Ω, the integrated buzzer of the BENNING CM 1-3 sounds.
See figure 6:
8.7 Voltage indicator
The voltage indicator function is possible from each position of the rotary switch.
No measuring lines are required as voltage indicator (non-contact detection of
an alternating field). The detector is located on the upper part of the device
behind the LED. By pressing the „VoltSensor" key 5, the display indication
disappears (if the display is switched on). If a phase voltage is localized, this is
indicated by an acoustic signal and a red LED signal J. An indication is made
in earthed AC current networks only! The phase can be determined by means
of a single-pole measuring line.
Practical hint:
Interruptions (cable breaks) in cables lying around openly such as e.g. cable
reels, fairy lights etc. can be traced from the feeding point (phase) to the point
of interruption.
Functional range: ≥ 230 V
See figure 7:
8.7.1 Phase test
- Connect the black safety measuring line to the COM jack 6 of the
BENNING CM 1-3.
- Bring the safety measuring line into contact with the measuring point of the
system part and press the „VoltSensor" key 5.
- If the red LED lights J and if there is an acoustic signal, the phase of an
earthed AC voltage is applied to this measuring point (system part).
9.

Maintenance

Before opening the BENNING CM 1-3, strictly observe that the

device is free of voltage! Electrical danger!
Working on the opened BENNING CM 1-3 under voltage must be carried out
by skilled electricians only who must observe special precautions for the
prevention of accidents!
To make sure that the BENNING CM 1-3 is free of voltage before opening the
device, proceed as follows:
- First, remove both safety measuring lines from the object to be measured.
- Then, remove both safety measuring lines from the BENNING CM 1-3.
- Switch the rotary switch 2 to position „OFF".
9.1 Securing the device
Under certain circumstances, safe operation of the BENNING CM 1-3 might no
longer be ensured, e.g. in case of:
- visible damages of the housing,
- incorrect measuring results,
- recognizable consequences of prolonged storage under inadmissible condi-
tions and
- recognizable consequences of extraordinary stress due to transport.
In such cases, immediately switch off the BENNING CM 1-3, disconnect it from
the measuring points and secure it against further use.
9.2 Cleaning
Clean the exterior of the device with a clean dry cloth (exception: special
05/ 2008
Diode test/ continuity test with buzzer
) by means of the rotary switch 2 of the
Diode test/ continuity test with buzzer
Voltage indicator with buzzer
BENNING CM 1-3
-key „continuity test".

14