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BENNING CM 12
Frequency measurement in the
function:
- 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.
- Use the
MODE
key
8
to select the coupling mode “V AC”.
- Use the
Cursor
keys
M
to select the “Hz” function and confirm it by pressing
the
OK/ENTER
key
N
.
- Read the measurement value displayed in the digital display
J
.
Frequency measurement in the
function:
- Use the
MODE
key
8
to select the coupling mode “A AC”.
- Use the
Cursor
keys
M
to select the “Hz” function and confirm it by pressing
the
OK/ENTER
key
N
.
- Operate the opening lever
4
and clamp the single-wire conductor centrally
by means of the clamp
1
.
- Read the measurement value displayed in the digital display
J
.
- Remember the minimum sensitivity for frequency measurements using the
BENNING CM 12 according to chapter 7.5!
See figure 3:
Alternating voltage (frequency measurement)
See figure 4:
Direct current/ Alternating current measurement (frequency
measurement)
8.8 Effective power measurements/ power factor 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 black safety measuring lead to the neutral conductor (N) of the
supplying mains.
- Connect the red safety measuring lead to the phase (L1) of the supplying
mains.
- Operate the opening lever
4
and clamp the single-wire live conductor cen
-
trally by means of the clamp
1
of the BENNING CM 12. The „+“ symbol on
the clamp
1
must be directed towards the energy source.
- By means of the
MODE
key
8
, it is possible to switch over from effective
power (W AC, W DC) to power factor (PF).
- Read the measurement value displayed in the digital display
J
.
Note on effective power:
If the energy flow changes its direction (from the load in direction of the energy
source), the „minus“ symbol is displayed in the digital display
J
.
Note on power factor:
In case of correct polarity and if no sign is displayed, there is an inductive load.
If the „minus“ sign is dislayed in the digital display
J
, there is a capacitive load.
General note:
For voltages below 10 V
AC/DC
or currents below 5 A
AC/DC
, nothing is displayed.
Overflow indication:
“OL.U” at overflow voltage, “OL.A” at overflow current and “OL.W” at overflow
effective power. Please observe figures 7b and 7c for measurements in the three-
phase supply network.
See figure 7a: single-phase load
See figure 7b: three-phase load without neutral conductor (N)
See figure 7c: three-phase load with neutral conductor (N)
8.9 Phase sequence indication
- Use the rotary switch
5
to select the desired function
and press
the
MODE
key
8
to select the phase sequence test (RST) at the
BENNING CM 12. “RST” and “LoU” are shown on the display.
- 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 black safety measuring lead to the assumed phase L3.
- Connect the red safety measuring lead to the assumed phase L1. With nor
-
mal function, „L1“ is displayed for approx. 3 seconds.
[1]
- If „L2“ is displayed, the buzzer sounds twice.
In this case, immediately
bring the red safety measuring lead into contact with the assumed
phase L2 while „L2“ still is indicated.
- When the „L2“ indication disappears, the test result is displayed as follows:
a) „1,2,3“ indication = clockwise phase sequence, L1 in front of L2