Question

The input impedance of CRO is nearly:

• A. Zero
• B. Around 10$\Omega$
• C. Around 100$\Omega$
• D. Around 1M$\Omega$

Hint:

The input impedance of a CRO is usually around 1M$\Omega$, which helps ensure that it doesn't load the circuit significantly.

Answer 1

The Correct Option is D

The input impedance of a Cathode Ray Oscilloscope (CRO) is designed to be very high to minimize the loading effect on the circuit being measured. Typically, this value is around 1M$\Omega$.
- Zero impedance would cause significant interference with the circuit under measurement, which is not ideal for CRO operation.
- 10$\Omega$ or 100$\Omega$ are much lower impedances and would alter the behavior of the circuit under test, thus these values are incorrect.
- The typical value of input impedance for most CROs is 1M$\Omega$, which provides a high enough impedance to avoid influencing the measurement while still ensuring proper signal detection.
Therefore, the correct answer is Around 1M$\Omega$.