This test determines the insulation resistance of a finished wire sample. Insulation resistance is of interest in high impedance circuits and as an insulation process quality control test. When used as part of a wire/cable environmental testing, prolonged thermal exposure, and/or extended high voltage testing, changes in the insulation resistance can be used as an indicator of insulation deterioration.
The pass/fail criteria for the test is based on the particular product specification
More information about insulation resistance testing is available here.
Perform visual examination of the specimen and record any defects.
Strip the ends of the specimen and submerge the sample in a saline solution with the ends above the fluid line.
Allow specimen to soak for the specified duration.
Attach specimen to test circuit.
Apply DC voltage and slowly raise to target voltage. Allow system to dwell at the specified voltage for the specified duration.
Measure the leakage current. Remove voltage from the specimen.
Report the sample length, leakage current, applied voltage, and insulation resistance per 1000 ft.