The test is very old, and pre-dates the high-voltage test by very many
years. You mentioned 'Megger' in your other post, yes, that was how it
was done. (A Megger (brand name) was/is a type of magneto with an
ohmmeter attached. The stable output voltage required for the ohmmeter
is achieved by a mechanical governor, which limits the armature speed
however fast you turn the handle.)
The test might not be totally irrelevant for modern electronic
equipment, but the requirements in most standards are certainly in need
of revision. These requirements are for a minimum insulation resistance
of 1 or 2 megohms. A modern piece of electronic equipment typically has
a resistance of hundreds of megohms (unless condensation occurs), so a
measured value of a few megohms shows that something is in fact
seriously wrong. I have raised this point in TC108 before, but no-one
was willing to take action. Tradition, you know.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-19 05:45, Scott Xe wrote:
Insulation resistance test is one of most common safety tests
nowadays: Flash test, earth continuity test, leakage current test and
insulation resistance test. Can someone share the history of this
teat to use DC and 500 V. The products are working on AC and test
voltage is higher than normal operating voltage but much lower than
the flash test. It is a trend to skip this test on production line.
What are the distinct benefits for this test?
Thanks and regards,
Scott
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