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A signal of 10 mv at 75 MHz is to be measured which of the following instrument can be used?
- a)VTVM
- b)CRO
- c)Moving iron voltmeter
- d)Digital multimeter
Correct answer is option 'B'. Can you explain this answer?
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A signal of 10 mv at 75 MHz is to be measured which of the following i...
At high frequencies, cathode ray oscilloscope is used
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A signal of 10 mv at 75 MHz is to be measured which of the following i...
Measuring a 10 mv signal at 75 MHz requires an instrument with high frequency response and sensitivity. Among the given options, a CRO (Cathode Ray Oscilloscope) is the most suitable instrument to measure such a signal. Here's why:
High frequency response:
- The CRO has a bandwidth of typically a few hundred MHz, which means it can accurately display signals up to that frequency range.
- A signal of 75 MHz falls well within the CRO's bandwidth, and hence it can measure it without any distortion or attenuation.
Sensitivity:
- The CRO can display signals with amplitudes as low as a few millivolts, depending on the gain setting and the vertical sensitivity of the input channel.
- A signal of 10 mv is well within the sensitivity range of most CROs, and hence it can be displayed accurately.
Other options:
- A VTVM (Vacuum Tube Voltmeter) is a high-impedance instrument that can measure low-level signals accurately, but it has a limited frequency response and is not suitable for measuring signals in the MHz range.
- A moving iron voltmeter is a mechanical instrument that is suitable for measuring DC or low-frequency AC signals, but it cannot measure high-frequency signals accurately.
- A digital multimeter can measure a wide range of signals, but its frequency response is limited to a few kHz, and hence it cannot measure signals in the MHz range.
In summary, a CRO is the most suitable instrument for measuring a 10 mv signal at 75 MHz due to its high-frequency response and sensitivity.
High frequency response:
- The CRO has a bandwidth of typically a few hundred MHz, which means it can accurately display signals up to that frequency range.
- A signal of 75 MHz falls well within the CRO's bandwidth, and hence it can measure it without any distortion or attenuation.
Sensitivity:
- The CRO can display signals with amplitudes as low as a few millivolts, depending on the gain setting and the vertical sensitivity of the input channel.
- A signal of 10 mv is well within the sensitivity range of most CROs, and hence it can be displayed accurately.
Other options:
- A VTVM (Vacuum Tube Voltmeter) is a high-impedance instrument that can measure low-level signals accurately, but it has a limited frequency response and is not suitable for measuring signals in the MHz range.
- A moving iron voltmeter is a mechanical instrument that is suitable for measuring DC or low-frequency AC signals, but it cannot measure high-frequency signals accurately.
- A digital multimeter can measure a wide range of signals, but its frequency response is limited to a few kHz, and hence it cannot measure signals in the MHz range.
In summary, a CRO is the most suitable instrument for measuring a 10 mv signal at 75 MHz due to its high-frequency response and sensitivity.
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A signal of 10 mv at 75 MHz is to be measured which of the following instrument can be used?a)VTVMb)CROc)Moving iron voltmeterd)Digital multimeterCorrect answer is option 'B'. Can you explain this answer?
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