OPERATING MANUAL MIC-10s1 version 1.03
59
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
V
R
min
where:
R
ISOmin
- minimum insulation resistance measured without limiting the converter current
V
ISOnom
- nominal test voltage
I
ISOnom
– nominal converter current (1.2 mA, 3 mA or 5 mA)
Additional uncertainty in the three-lead measurement (impact of G terminal): 0.05% with reduced
current leakage incurred by 250 k
Ω resistance during 100 MΩ measurement with 50 V measurement
voltage.
Max. short-circuit current
: 6 mA ±15 %
Measuring/charging current in the remaining load range shall be selected from the following values:
1.2 mA, 3 mA, 5 mA.
Measurement with AutoISO-5000
Display range
Resolution
Basic uncertainty
000 k
to 999 k
1 k
±(3 % m.v. + 10 digits ) of
the meter
± 1 % additional
uncertainty of AutoISO-5000
1.00 M
to 9.99 M
0.01 M
10.0 M
to 99.9 M
0.1 M
100 M
to 999 M
1 M
1.00 G
to 9.99 G
0.01 G
10.0 G
to 99.9 G
0.1 G
100 G and above to the
value at which the addi-
tional uncertainty of Au-
toISO-5000 is 5%
1 G
±(3 % m.v. + 10 digits ) of
the meter
± 5 % additional
uncertainty of AutoISO-5000
Measurement of leakage current
Display range
Resolution
Basic uncertainty
0
to
1.2 mA
*
**
0
to
3 mA
0
to
5mA
* - resolution and units result from the measurement range of individual insulation resistance.
** - calculated basing on resistance measurements
Measurement of capacitance
Display range
Resolution
Basic uncertainty
0 nF
to
999 nF
1 nF
(5% m.v. + 5 digits)
1.00 µF
to
49.99 µF
0.01 µF
Measurement of capacitance is available only during R
ISO
measurement (when discharging the
object).
Base uncertainty of measurement is met for the tested capacitance connected in parallel with a
resistance greater than 10 MΩ.
For measurement voltages below 100 V the measurement error is not specified.
The cable lenght L is calculated as C/Cx, measurement uncertainty depends on measurement
range.
Time Constant TC is calculated as Riso x C, measurement uncertainty depends on measure-
ment range.
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