OPERATING MANUAL MIC-2501 version 1.04
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12 Technical specifications
12.1 Basic data
Abbreviation "m.v." used in the specification of basic uncertainty means standard measured value
AC / DC voltage measurement
Display range
Resolution
Basic uncertainty
0…299.9 V
0.1 V
(3% m.v. + 2 digits)
300…750 V
1 V
Frequency range for AC: 45 Hz...65 Hz
Measurement of insulation resistance
Measuring range according to IEC 61557-2: R
ISOmin
= U
ISOnom
/I
ISOnom
…1000 G
(I
ISOnom
= 1 mA)
Double-lead measurement
Display range
Resolution
Basic uncertainty
0.0 k
...999.9 k
0.1 k
(3 % m.v. + 20 digits)
1.000 M
...9.999 M
0.001 M
10.00 M
...99.99 M
0.01 M
100.0 M
...999.9 M
0.1 M
1.000 G
...9.999 G
0.001 G
10.00 G
...99.99 G
0.01 G
100.0 G
...999.9 G
0.1 G
1000 G
1 G
When the range is exceeded, the device displays ">xxxxGΩ" (where xxxx is the limit value for
the selected range).
Approximate maximum values of the measured resistance, depending on the test voltage, are pre-
sented in the table below. For other voltages the range limits may be read from the chart below.
Voltage
Test range
up to 100 V
50 G
200 V…400 V
100 G
500 V…900 V
250 G
1000 V…2400 V
500 G
2500 V
1000 G
Note:
For insulation resistance below R
ISOmin
there is no accuracy specified because the meter
works with the adjustable current limit in accordance with the following formula:
ISOnom
nom
ISO
ISO
I
U
R
min
where:
R
ISOmin
– minimum insulation resistance measured without limiting the converter current
U
ISOnom
– nominal test voltage
I
ISOnom
– nominal inverter current (1 mA)
Max. short-circuit current: I
SC
= 1.4
mA ±15 %
