Insulation Multimeters
Performance Test
19
3.
Turn the rotary switch to
INSULATION
.
4.
Set the voltage range on the UUT; see Table 4.
5.
Apply the Calibrator Output to the UUT; see Table 4.
6.
Press
t
on the UUT.
7.
Verify that the display reading is within the limits given in Table 4.
Table 4. Insulation Resistance Accuracy Test
UUT Display Reading
Step
UUT
Voltage
Range
Calibrator
Resistance
Range
Calibrator
Output
Limit Low
Limit High
1 500
V
60.0
M
Ω
0.500
M
Ω
0.0 1.0
2 500
V
500
M
Ω
450
M
Ω
438
462
3 500
V
500
M
Ω
600
M
Ω
>550
>550
4
1000 V
2.0 G
Ω
1.7
G
Ω
1.2
2.2
5 1000
V 600
M
Ω
600
M
Ω
586
614
1587 Only
6 1000
V 60.0
M
Ω
1
M
Ω
0.5
1.5
7 50
V
6.00
M
Ω
100
k
Ω
0.05
0.15
8 50
V
50.0
M
Ω
45
M
Ω
43.1
46.9
9 100
V
6.00
M
Ω
100
k
Ω
0.05
0.15
10 100
V
100
M
Ω
95
M
Ω
87
103
11 250
V
60.0
M
Ω
250
k
Ω
0.0
0.8
12 250
V
250
M
Ω
225
M
Ω
217
233
Insulation Function, External Sense
The following test verifies that the UUT will sense a voltage > 30 V when present on
the circuit under test.
1.
Connect the UUT
INSULATION
output terminals to the calibrator voltage output
terminals.
2.
Turn the rotary switch to the
INSULATION
function.
3.
Apply 35 V, 50 Hz to the UUT.
4.
Verify that the UUT displays > 30 V in the primary display.
