Understanding CRO Measurement Capabilities
A Cathode Ray Oscilloscope (CRO) is primarily designed to display and measure electrical signals, especially voltage as a function of time.
- Voltage: CROs directly measure voltage amplitudes and variations.
- Voltage Ripple: This is a type of voltage fluctuation, which is clearly visible and measurable on a CRO screen.
- Current: While not measured directly, current can be inferred. By placing a known resistor ($R$) in series and measuring the voltage drop ($V$) across it, current ($I$) can be calculated using Ohm's Law: $I = V/R$.
Limitations of CRO Measurement
Resistance is an electrical property representing opposition to current flow. It's a static characteristic of a component or circuit, not a time-varying signal.
A CRO displays voltage waveforms over time. It cannot inherently measure a property like resistance, which requires a different measurement principle (like applying a known voltage/current and measuring the other, typically done by an ohmmeter).
Conclusion
Therefore, resistance is the property that cannot be directly measured using a CRO device.
Similar Questions
Aquadag coating is most commonly used in CROs to:
An oscilloscope displays a 50 Hz, 20 V peak-to-peak sine waveform. Identify the reading in a digital multimeter for the same signal.
- The shape of the time base signal of a CRO is generally a _____.
A CRO displays a sine waveform which spans 3 cycles in 6 horizontal divisions. If the time base switch is set to 1 ms/div, what is the frequency of this signal which is being measured?
- The lowest scale probe suitable for measuring 250V DC using a CRO with I/P limit of 30V is:
- How is a Lissajous pattern created?
- If a CRO maximum input is 10V, then which of these probes can be used to measure 60V?
Which among the following instruments can generate sine waves with variable frequency and amplitude?
Important Questions from Cathode Ray Oscilloscope
Lissajous pattern obtained on CRO is used to determine
In a Cathode Ray Tube, the source of emission of electrons is:
The function of a trigger level knob on a CRO is:
When two equal voltages of equal frequency but with a phase shift (not equal to 0°C or 90°) are applied to a CRO, we obtain :
- The input impedance of CRO is nearly:
