36
the tester will do the test. During the test, if the test current is great than the preset value,
the tester will alarm with sound and light. Press the "STOP" key, the alarm will be stopped.
If the test time is return to 0 and the tester is not alarm, the test is passed and the DUT
(Device Under Test)T is eligible.
Note: During DCW test, confirm the measurement circuit is without any electricity before
replace another device.
3.Electrical machine- whole instrument‟s electric intensity (Withstanding
voltage intensity) test
According to the picture below to connect the Withstanding voltage tester and DUT, get
through the power supply switch, set the leakage current warning value according to the
product standard of DUT, and then test it as per the 3 or 4
th
operation steps. If there is no
concrete leakage current warning value in the product standard, following formula is
recommended:
I
Z
=k
p
(U/R)„„„„
(
1
)
I
Z
──Leakage current warning value
A
;
U——Test voltage
,
V
;
R──Allowed minimum Insulation resistance value
;
k
p
——Motion index
,
generally take 1.2
~
1.5
For instance: One electrical machine with its regulated min. IR value as 2 10
6
,
test
voltage is 1500V
。
As per formula (1)
,
then
I
Z
=k
p
(U/R)=
(
1.2
~
1.5
)
(1500/2 10
6
)
=
(
1.2
~
1.5
)
0.75 10
-3
1 10
-3
(
A
)
Take 1mA.
Содержание CS2670A
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