―
16
―
7.2 Measuring insulation resistance (RINS)
This measurement may only be performed if the DUT has successfully
completed protective conductor resistance testing (Safety class l device). The
objective of this test is to ensure that the insulation between Phase or Neutral
conductor of the mains power supply and the metal casing and accessible
conductive parts of the DUT is satisfactory.
(1) Connect the DUT as described in clause 6. If it is a Class II or III device,
connect the PE/2mA terminal and exposed metal parts with Test Lead.
(2) Switch the DUT on.
(3) Set the range switch to "RINS 200M
Ω
" position.
(4) Read the measured value in "M
Ω
" from the LCD.
Results
Insulation resistance may not fall short of below values.
This instrument has LED indications which illuminate when the resulting
measurement is below the DUT threshold value of 0.5M
Ω
or 2.0M
Ω
.
(according to DIN VDE 0702)
CAUTION
●
When the terminal is open or the resistance value exceeds measuring
range, "OL" mark (over range display) appears on the LCD.
●
Depending on the type of DUT, insulation resistance value is unstable
and the indication may not become stable. In that case, regard the
measured value as a reference value.
●
Do not touch the DUT while testing is in progress. Since a high voltage of
500V is outputting continuously, user may get electrical shock.
！
Safety class
VDE0701
VDE0702
Ⅰ
1M
Ⅰ
(with heating elements)
Ⅱ
Ⅲ
1000
Ω
/V or
250k
Ω
2M
Ω
2M
0.3M
Ω
0.5M
Ω
Fig.15
