Dielectric Strength Test - NEC MultiSync LCD2080UX -BKA Service Manual

b. Earth resistance testing
This testing should be carried out prior to the dielectric strength test.
The earth resistance should be 100mΩ or less when a current of 25A AC is carried between the earth
side of the cord and the metallic block that is used as a safety earth for the unit.

1.7.3 Dielectric Strength Test

To confirm the freedom from insulation breakdown, testing should be carried out under the conditions
specified below.
1) Measuring conditions
• Measuring instrument : Dielectric strength tester (The specified voltage should be maintained
• Testing point
Note: The electrical circuit block should mean the power input block (primary side). Testing should be
carried out under the condition that both poles of the power plug are short-circuited. (Where a 3-core
cord is used, the two poles other than the earth terminal should be short-circuited.)
2) Judgment standard
The freedom from insulation breakdown should be confirmed under the condition that the applied voltage
is maintained at 1500V AC (+0 to 50V) for one minute.
Even though the result of this testing is OK, such a condition should be regarded as unacceptable if there
is a leakage (flashing) around the section where the test voltage has been applied.
in the state that a current of 10mA is carried.)
: Between the electrical circuit block and the exposed metallic block
(DVI connector)
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