Fluke FLK-1555FC/IR Расширенная инструкция онлайн [31/50] 529775

Insulation Tester

The Tester

Surface Leakage

Current

Shield

( )

GHH13.EPS

Figure 6. Surface Leakage Current

Figure 7 shows how to prevent surface current leakage with a lead connected

from the Guard terminal to a conductor that surrounds the inner insulation. The

surface leakage current is directed to the Guard terminal. This removes the

leakage current from the measurement path between the positive and negative

terminals, and improves the accuracy of the test readings.

Leakage

Current

Shield

( )

Optional

GHH14.EPS

Figure 7. Guard Terminal Connection

Figure 8 shows how make the measurement setup better. Connect the Guard

terminal to the unused wire and attach it to the inner insulation. This ensures

that the Tester measures the leakage between the selected conductor and the

outer shield, but removes the leakage path between conductors.