Operation Manual

Connect the test cable to the BENNING IT 110/ BENNING IT 120 B.

Step 2 Set the following measuring parameters:

- Fuse type

- Fuse current rating

- Fuse trip-out time

Appendix A contains a list of different fuse types.

Step 3 Followtheconnectiondiagramshowningure5.29toperformloopimpedancemeasu-

rement. Use the Help function if necessary.

LPEN

Fig. 5.29 Connection of plug cable and universal test cable

Step 4 Check the displayed warnings and online voltage/terminal monitor before starting the

measurement. If OK, press the TEST key. After performing, the measurement results

appear on the display together with the PASS/FAIL indication (if applicable).

Fig. 5.30: Example of loop impedance measurement results

Displayed results:

Z: Loop impedance

: Prospective short-circuit current

Lim: Low limit of prospective short-circuit current value

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).

Note:

- L and N test terminals are reversed automatically if L/L1 and N/L2 test leads (universal test

cable) are connected in reversed way, or terminals of the tested wall plug are reversed, or plug

commander is turned around.

- Thespeciedaccuracyoftestedparametersisvalidonlyifthemainsvoltageisstableduring

the measurement.

- The low limit prospective short-circuit current value depends on fuse type, fuse current rating,

fuse trip-out time and I

PSC

scaling factor.