Fluke 1550C User Manual

Insulation Tester
The Tester
13
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
G
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.

Fluke 1550C Specifications

General

Display type	-
Housing color	Grey, Yellow
Maximum voltage	5000 V
AC voltage range	250 - 5000 V
Operating altitude	0 - 2000 m
Overload protection	Yes
Storage temperature (T-T)	-20 - 65 °C
Operating temperature (T-T)	-20 - 50 °C
Operating relative humidity (H-H)	0 - 80 %
International Protection (IP) code	IP40
Battery technology	Sealed Lead Acid (VRLA)
Number of batteries supported	1

Weight and Dimensions

Depth	277 mm
Width	269 mm
Height	160 mm
Weight	3700 g