Sonel MPI-536 - Page 83

MPI-536 – USER MANUAL
81
Double-lead measurement
Measurements with WS adapter
Select the type of network and the designation of the
measured pair of conductors.
Depending on your needs, set the following:
 times t
1
, t
2
, t
3
for calculating absorption coefficients,
 types of absorption coefficients,
 temperature coefficients.
 DAR = R
ISO_60s
/R
ISO_15s
 PI = R
ISO_10min
/R
ISO_1min
= R
ISO_600s
/R
ISO_60s
When measuring the insulation resistance, the instrument may take into account the correction
factors k20 and k40 in accordance with the ANSI/NETA ATS-2009 standard, and thus convert
the measurement results to the reference temperature values.
After selecting the appropriate ratio, selection options are shown. The value of the coefficients
may be entered:
 directly - enter the coefficient value manually,
 indirectly - by setting the type of insulation of the tested object and the ambient temperature.
Then the instrument will automatically calculate the coefficient value.
After confirming the settings, additional results will appear on the measurement screen.
 R
ISO_k20
– insulation resistance converted to a temperature of 20°C thanks to the k20 coeffi-
cient:
R
ISO_k20
= R
ISO
* k20
 R
ISO_k40
– insulation resistance converted to a temperature of 40°C thanks to the k40 coeffi-
cient:
R
ISO_k40
= R
ISO
* k40