Fluke 1550 User Manual page 16

1550
Users Manual
Figure 6 shows how to prevent surface current leakage by connecting a lead
from the Guard terminal to a conductor wrapped around 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.
Shield
Figure 7 shows how to improve the measurement setup by connecting the
Guard terminal to the unused wire and coupling it to the inner insulation. This
insures that the Meter measures the leakage between the selected conductor
and the outer shield, but eliminates the leakage path between conductors.
Shield
Figure 7. Improved Guard Terminal Connection
10
Figure 6. Guard Terminal Connection
Leakage
Current
Leakage
Currents
( )
( )
G
( )
ADB14F.EPS
( )
( )
G
( )
ADB15F.EPS