1672/1673 FC/1674 FC
Users Manual
38
Line Impedance
Line impedance is source impedance measured between Line conductors or Line and Neutral.
This function allows these tests:
Line to Neutral loop impedance.
Line to Line impedance in 3-phase systems.
L-PE loop measurement. This is a high-current, 2-wire loop measurement. It cannot be
used on circuits protected by RCDs because it will cause them to trip.
Prospective Short Circuit Current (PSC). PSC is the current that can potentially flow if the
phase conductor is shorted to the neutral conductor or another phase conductor. The
Tester calculates the PSC current as the measured mains voltage divided by the line
impedance.
To measure line impedance:
1. Select the
HI CURRENT mode. See Figure 13.
2. Connect the red lead to the L (red) and the blue lead to the N (blue) terminals of the Tester.
3. Select L-N.
4. 1674 FC only, select between
and m resolution for the test results. The m resolution
test takes 30 seconds to 60 seconds to complete.
5. Zero the test leads. For more information, see How to Zero the Test Leads.
Figure 13. Line Impedance Measurement Screen
Functions Form
Loop Trip
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