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Loading by the measuring instruments introduces an error in the measured parameter. Which of the following devices gives the most accurate result?
1. PMMC
2. Hot-wire
3. CRO
4. Electrodynamic

1 Answer

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Correct Answer - Option 3 : CRO

Application:

To get accurate results, the input impedance of the instrument must be very high.

Out of the given instruments, CRO has higher input impedance then PMMC, hot wire, and electrodynamic type instruments.

Therefore, the error in the measured parameter due to the loading effect will be less in CRO than that of others.

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