EIA RS-186-13-E-1978

$20.15

Passive Electronic Component Parts, Test Methods for; Method 13: Insulation Resistance Test

Published By	Publication Date	Number of Pages
ECIA	1978	5

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Category: ECIA

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PURPOSE

This test is to measure the resistance offered by the insulating
members of a component part to an impressed direct voltage tending
to produce a leakage of current through or on the surface of these
. members. A knowledge of insulation resistance is important, even
when the values are comparatively e high, as these values may.be
limiting factors in the design of high-impedance circuits. Low
insulation resistance, by permitting the flow of large leakage
currents, can.disturb the operation of circuits intended to be
isolated, for example, by forming feedback loops. Excessive leakage
currents can eventually lead to deterioration of the insulation by
heating or direct-current electrolysis. Insulation-resistance
measurements should not be considered the equivalent of dielectric
withstanding voltage or electric breakdown tests. A clean, dry
insulation may have a high insulation resistance, and yet possess a
mechanical fault that would cause failure in the dielectric
withstanding voltage test. Conversely, a dirty, deteriorated
insulation with low insulation resistance might not break down
under a high potential. Since insulating members composed of
different materials or combinations of materials may have
inherently different insulation resistance, the numerical value of
measured insulation resistance cannot properly be taken as a direct
measure of the degree of cleanliness or absence of deterioration.
The test is especially helpful in determining the extent to which
insulating properties are affected be deteriorative influences,
such as heat, moisture, dirt, oxidation, or loss of volatile
materials.