ALSO SEE EIA-136 SERIES
PURPOSE
This test is to measure the resistance offered by the insulatingmembers of a component part to an impressed direct voltage tendingto produce a leakage of current through or on the surface of these. members. A knowledge of insulation resistance is important, evenwhen the values are comparatively e high, as these values may.belimiting factors in the design of high-impedance circuits. Lowinsulation resistance, by permitting the flow of large leakagecurrents, can.disturb the operation of circuits intended to beisolated, for example, by forming feedback loops. Excessive leakagecurrents can eventually lead to deterioration of the insulation byheating or direct-current electrolysis. Insulation-resistancemeasurements should not be considered the equivalent of dielectricwithstanding voltage or electric breakdown tests. A clean, dryinsulation may have a high insulation resistance, and yet possess amechanical fault that would cause failure in the dielectricwithstanding voltage test. Conversely, a dirty, deterioratedinsulation with low insulation resistance might not break downunder a high potential. Since insulating members composed ofdifferent materials or combinations of materials may haveinherently different insulation resistance, the numerical value ofmeasured insulation resistance cannot properly be taken as a directmeasure of the degree of cleanliness or absence of deterioration.The test is especially helpful in determining the extent to whichinsulating properties are affected be deteriorative influences,such as heat, moisture, dirt, oxidation, or loss of volatilematerials.
- Edition:
- E
- Published:
- 10/01/1978
- ANSI:
- ANSI Approved
- Number of Pages:
- 5
- File Size:
- 0 files
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