Benning CM 12 Bedienungsanleitung Seite 38

- Read the measurement value displayed in the digital display J .
Frequency measurement in the
- 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:
See figure 4:
8.8 Effective power measurements/ power factor measurements
- Select the desired function
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
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:
See figure 7b:
See figure 7c:
8.9 Phase sequence indication
- Use the rotary switch 5 to select the desired function
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.
- 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
b) „3,2,1" indication = anti-clockwise phase sequence, L2 in front of L1
c) „----" indication
d) „LoU" indication
- Press the OK/ENTER key N to repeat the measurement.
Note:
[1]
If the voltage is < 30 V, „LoU" is displayed and if the voltage is > 1050 V,
„OL.U" is displayed. If the frequency is not within the range from 45 Hz
or 65 Hz, „out.F" is displayed.
08/ 2018
Alternating voltage (frequency measurement)
Direct current/ Alternating current measurement (frequency
measurement)
or currents below 5 A
AC/DC
single-phase load
three-phase load without neutral conductor (N)
three-phase load with neutral conductor (N)
= measurement cannot be evaluated
= One of the safety measuring leads has not been con-
tacted during measurement.
BENNING CM 12
function:
by means of the rotary switch 5 of the
, nothing is displayed.
AC/DC
and press
[1]

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