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The guard is connected between the two measurement contact points, and the
surface susceptible to surface currents, (e.g. dusty, damp cable or transformer
insulation). In this case, alligator clips are preferable to test-probes held in the
hand.
As soon as insulation measurement is stopped, the test circuit is automatically
discharged using the instrument's internal resistance.
4.3 OPERATION EXAMPLES
Connection diagram for measurement of low insulation (e.g. motor):
Connection diagram for measurement of strong insulation:
a) Example of a motor (reduction of capacitive effects).
b) Example of a cable (reduction of superficial leak effects).
External insulator
Megohmmeter Models 5050 & 5060
M
M
Braid
Insulator
Cable
+
110 - 230V
50/60 Hz
20 VA max
FF 0.1A
380V - 10kA
5x20mm
G
-
SMOOTH
MEM
1000V CAT III
(
2500V
)
nd
2
MR
+
110 - 230V
50/60 Hz
20 VA max
G
FF 0.1A
380V - 10kA
5x20mm
G
-
1000V CAT III
(
2500V
)
+
110 - 230V
50/60 Hz
20 VA max
G
Guard
-
1000V CAT III
(
2500V
)
RS-232
SET-UP
MΩ 50-5000V
MΩ - 5000V
MΩ - 2500V
MΩ -1000V
MΩ - 500V
OFF
V/TIME
ALARM
START/STOP
PRINT
R-DAR-PI-DD
MEGOHMMETER
PRINT MEM
R(t)
MODEL 5060
RS-232
SET-UP
MΩ 50-5000V
MΩ - 5000V
MΩ - 2500V
MΩ -1000V
MΩ - 500V
OFF
V/TIME
SMOOTH
ALARM
START/STOP
MEM
PRINT
R-DAR-PI-DD
MEGOHMMETER
2
nd
MR
PRINT MEM
R(t)
MODEL 5060
RS-232
SET-UP
MΩ 50-5000V
MΩ - 5000V
MΩ - 2500V
FF 0.1A
380V - 10kA
5x20mm
MΩ -1000V
MΩ - 500V
OFF
G
V/TIME
SMOOTH
ALARM
START/STOP
MEM
PRINT
R-DAR-PI-DD
MEGOHMMETER
2
nd
MR
PRINT MEM
R(t)
MODEL 5060
29
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