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The chief reason a Wheatstone bridge cannot be used for insulation resistance is that

  • A.the low voltage of the bridge battery would puncture the insulation being tested
  • B.the arms needed would be impracticably large
  • C.the bridge would be unbalanced by the capacitance of the specimen under test
  • D.insulation resistance changes with time and no steady balance could ever be reached

Answer: B

Balancing a specimen of hundreds of megohms would need standard arms of the same order, which are neither stable nor readily made, and the current available for the detector would be minute. The megohm bridge with its guard circuit and high voltage supply is built for the purpose instead.

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