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BENNING CM 12
8.3 Resistance measurements
- Select the desired function
by means of the rotary switch
5
of the
BENNING CM 12.
- Connect the black safety measuring lead to the COM socket
O
on the
BENNING CM 12.
- Connect the red safety measuring lead to the socket +
P
on the
BENNING CM 12.
- Connect the safety measuring leads to the measuring points. Read the
measurement value displayed in the digital display
J
.
See figure 5:
Resistance measurement/ diode test/ continuity test with buzzer
8.4 Diode tests
- Select the desired function
by means of the rotary switch
5
of the
BENNING CM 12.
- Connect the black safety measuring lead to the COM socket
O
on the
BENNING CM 12.
- Connect the red safety measuring lead to the socket +
P
on the
BENNING CM 12.
- Connect the safety measuring leads to the measuring points. Read the
measurement value displayed in the digital display
J
.
The display behaviour of the BENNING CM 12 has changed and depends on
the serial number:
As of serial no. 91000277:
- For a typical silicone diode tested in the forward-biased direction a voltage
flow between 0.400 V and 0.800 V is displayed. A display showing “000” in
-
dicates a short circuit in the diode, whereas a display showing “OL” indicates
an open circuit in the diode.
- For a diode tested in the reverse-biased direction the display reads “OL”. If
the diode is damaged, the display will show “000” or other values.
Up to serial no. 91000277:
- For a normal silicone diode located in flow direction, the flow voltage be
-
tween 0.400 V and 0.800 V is displayed. “OL” indicates a short-circuit or an
interruption inside the diode.
- For a diode applied in reverse direction, a negative forward voltage between
-0.400 V and -0.800 V is indicated.
See figure 5:
Resistance measurement/ diode test/ continuity test with buzzer
8.5 Continuity test with buzzer
- Select the desired function
by means of the rotary switch
5
of the
BENNING CM 12.
- Connect the black safety measuring lead to the COM socket
O
on the
BENNING CM 12.
- Connect the red safety measuring lead to the socket +
P
on the
BENNING CM 12.
- Connect the safety measuring leads to the measuring points. If the line resis-
tance between the COM jack
O
and the jack +
P
falls below the adjustable
limiting value (30 Ω to 100 Ω), the integrated buzzer of the BENNING CM 12
sounds and the red LED
3
lights up.
See figure 5:
Resistance measurement/ diode test/ continuity test with buzzer
8.6 Capacity measurement
Discharge capacitors fully before measurement! Never apply
voltage to the sockets for capacitance measurement as this
may cause irreparable damage to the unit. A damaged unit may
represent an electrical hazard!
- Select the desired function
by means of the rotary switch
5
of the
BENNING CM 12.
- Determine the polarity of the capacitor and discharge capacitor completely.
- Connect the black safety measuring lead to the COM socket
O
on the
BENNING CM 12.
- Connect the red safety measuring lead to the socket +
P
on the
BENNING CM 12.
- Contact the discharged capacitor with the safety measuring leads observing
correct polarity. Read the measurement value on the digital display
J
of the
BENNING CM 12.
See figure 6:
Capacity measurement
8.7 Frequency measurement
- Select the desired function
or
by means of the rotary switch
5
of
the BENNING CM 12.
