Insulation Measurement - AEMC Megohmmeters 6522 User Manual

3.3.2 Insulation Measurement

Influencing
Parameter
Temperature
Relative
humidity
Supply
voltage
50/60Hz
AC voltage
superposed
on the test
voltage (V )
T
Capacitance
in parallel on
resistance to
be measured
Range of
Influence
3GΩ < R < 10GΩ
-20 to + 55°C
(-4 to 131°F)
20 to 80% RH
6.6 to 9.6V
0 to 5µF at
1mA
50, 100 and 250V:
from 10kΩ to 3GΩ
0 to 2µF
0 to 1µF
Quantity
Influenced
MΩ
R ≤ 3GΩ
10GΩ ≤ R
V : 50 to 500V
T
V : 1000V
T
Measurement
current
MΩ
V : 50 to 1000V
T
Measurement
current
MΩ
50V:
R ≤ 0.1GΩ : 4V
from 0.1 to 1GΩ : 0.2V
100 and 250V:
from 100kΩ to 10MΩ : 20V
from 10MΩ to 1 GΩ : 0.3V
500 and 1000V:
from 500kΩ to 50MΩ : 20V
from 50MΩ to 3 GΩ : 0.3V
MΩ
500 and 1000V:
from 100kΩ to
10GΩ
50V: ≤5GΩ
250V: ≤15GΩ
1000V: ≤100GΩ
Influence
Typical
2% R/10°C +
1% R/10°C 3% R/10°C +
+ 1pt
4% R/10°C +
0.5% R/10°C +
1% R/10 °C +
1% R/10°C + 2% R/10°C +
1 ct
2% R + 1 ct
0.1% R + 2 ct
6% R + 2 ct 10% R + 2 ct
6% R + 2 ct 10% R + 2 ct
6% R + 2 ct 10% R + 2 ct
Maximum
2 ct
2 ct
2 ct
1 ct
1 ct
2 ct
3% R + 2 ct
1% R + 2 ct
1% R + 2 ct
5% R + 2 ct
1% R + 1 ct