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To minimise the loading effect of circuit under test, the input impedance of the device must:
  • a)
    Be very high
  • b)
    Be capacitive
  • c)
    Be very low
  • d)
    Match with the input impedance of the circuit
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
To minimise the loading effect of circuit under test, the input impeda...
Loading effect:
  • When a voltmeter having an internal resistance of R
    m
    is connected in parallel with load resistance R
    L
    of circuit under test, the circuit conditions will be altered.
  • The effective resistance will be the parallel combination of R
    L
    and R
    m
    . The voltmeter indicates the voltage across this effective resistance, where the indicated voltage will always be less than true voltage. This is known as loading effect.
  • Hence the instrument must possess high input impedance to reduce loading effect.
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To minimise the loading effect of circuit under test, the input impedance of the device must:a)Be very highb)Be capacitivec)Be very lowd)Match with the input impedance of the circuitCorrect answer is option 'A'. Can you explain this answer?
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