The unit is effective in the testing of pipeline insulators in parallel or series installations even if one or more of the insulators are not operating properly. The tests conducted are fast and accurate, since high resistance shorted insulators are as easy to determine their effectiveness as are the low resistance shorted insulators. The Tester is equipped with an audible signal circuit, and the tone frequency varies from slow to fast according to resistance across probes. The lower the electrical resistance of the insulator, the faster the frequency of the audible signal.
Batteries exchange in seconds through a panel in the access door.
The Tester consists of a portable battery powered electronic instrument with detachable probes for making positive electrical contact across the insulator. The instrument is packaged in a plastic case complete with batteries ready to operate. Two extra steel needle points are supplied with the Tester. The unit is factory calibrated and needs no field adjustments. Calibrations are made with the probe wire conductors supplied with the unit.