18
Megohmmeter Model 1015
Figure 10 shows connec-
tions for testing insulation
from a supply conductor in a
switchbox to ground (motor
frame). An identical test may
be carried out from the motor
starter.
4.3 CONTINUITY MEASUREMENTS
Once it has been verified that no voltage is present, the continuity check
may be performed.
• Set the switch to the 10
Ω
+ position. The measurement is done
automatically;
you do not need to press the yellow button.
• Read the value on the white scale (0 to 10)
Ω
.
• Set the switch to the 10
Ω
– position and make sure that the needle of the
instrument reads the same value. If the second value is different from the
preceding one, add up the two readings and divide by two. The reason for
taking two different readings is to comply with the international standard
VDE 0413-4. If your work does not require you to conform to this standard,
only one measurement is necessary.
• Return to
OFF
after use.
NOTE:
For better measurement accuracy on the 10
Ω
+ and
the 10
Ω
– ranges, measure the resistance of the leads by short-
circuiting them, then subtract this value from the measured values.
Motor Side
of Switch:
Connection
to One Leg
Grounded
Motor Frame
Starter In
+
-
OFF
M
Ω
- 1000 V
M
Ω
- 500 V
1000
Ω
AEMC
I N S T R U M E N T S
MEGOHMMETER
M O D E L 1 0 1 5
Battery
Check
10
Ω +
10
Ω −
0.1
0.5
1
5 10
50 100
500
1000
0
1
2
3
4
5
6
7
8
9
10
0
100
200
300
400
500
600V
600V
-
+
6
!
M
Ω
Figure 10
