18 GOSSEN METRAWATT GMBH
Sequence
Note
☞
All switches at the device under test must be set to the on posi-
tion during measurement of insulation resistance, including tem-
perature controlled switches and temperature regulators as well.
Measurement must be performed in all program stages for
devices equipped with program controllers.
R-ISO
Start measurement.
Nominal voltage is 500 V DC in this case.
Nominal voltage can be adjusted within a range of 50 V to 550 V DC.
Note
☞
When insulation measurement is first started from the menu,
nominal voltage is always set to 500 V. Open-circuit voltage is
always greater than nominal voltage.
Minimum Allowable Limit Values for Insulation Resistance
* with activated heating elements
(if heating power > 3 kW and R
ISO
< 0.3 MΩ: leakage current measurement
required)
Notes Concerning Test Standard 0702
If the measured value is less than 0.3 MΩ for safety class I devices which
include a heating element, equivalent leakage current must be measured
as described in chapter 9.4 on page 20, and this test must be passed.
The same applies to mains powered safety class II electronic devices if
the required value of 2 MΩ is not complied with.
All exposed, conductive parts of safety class II and III devices, as well as
of battery-powered devices must be scanned with the probe and insula-
tion resistance and/or leakage current must be measured.
Batteries must be disconnected from their terminals during testing of
battery powered devices.
Test Standard Test Voltage
R
ISO
SC I SC II SC III Heat
VDE 0701
Part 1:2000
500 V
1MΩ 2MΩ 0.25 MΩ 0.3 MΩ
∗
VDE 0702:
2004
1MΩ 2MΩ 0.25 MΩ 0.3 MΩ
∗
VDE 0751:
2001
2MΩ 7MΩ
70 MΩ 70 MΩ
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