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Fig. 5.39: Voltage and frequency measurement menu
Connect the test cable to the BENNING IT 110/ BENNING IT 120 B.
Step 2 Followtheconnectiondiagramshowningure5.40toperformvoltageandfrequency
measurement.
L1
L2
L3
N
PE
R
E
Ro
LPEN
L
/
L
1
N
/
L
2
P
E
/
L
3
N/
L2
L
/
L
1
PE/L3
Fig. 5.40: Connection diagram
Step 3 Check the displayed warnings and online voltage/terminal monitor. Continuous test is
running. Actual results are shown on the display during measurement.
Fig. 5.41: Examples of voltage and frequency measurements
Displayed results:
Ul-n Voltage between phase and neutral conductor
Ul-pe Voltage between phase and protective conductor
Un-pe Voltage between neutral and protective conductor
When testing three-phase system the following results are displayed:
U1-2 Voltage between phases L1 and L2,
U1-3 Voltage between phases L1 and L3,
U2-3 Voltage between phases L2 and L3.
Save displayed results for documentation purposes. Refer to chapter 6.1 for further information on
setting functions and saving of measurement results (BENNING IT 120 B only).
5.8 Testing the PE terminal
In new or adapted installations it may occur that the PE conductor is reversed with the phase con-
ductor - this is a very dangerous situation! It is therefore important to test if there is phase voltage
at the PE terminal.
This test has to be performed before tests where mains supply voltage is applied to the instrument
circuitry or before the installation is used.
43


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