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
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 shape of the time base signal of a CRO is generally a _____.
CRO stands for:
- How is a Lissajous pattern created?
Aquadag coating is most commonly used in CROs to:
Important Questions from Cathode Ray Oscilloscope
Calculate the maximum velocity of the beam of electrons in a CRT having a cathode and anode voltage of 182 V. Assume that the electrons leave the cathode with zero velocity. (Charge of electron = 1.6 × 10-19 C and mass of electron = 9.1 × 10-31 kg)
Which of the following expression is the correct formulae for the deflection sensitivity ‘S’ of a CRT, if
D = deflection on the fluorescent screen
L = distance from the center of the deflection plates to the screen
Ld = effective length of the deflection plates
d = distances between the deflection plates
Ed = Potential between deflecting plates
Ea = accelerating voltageTrigger pulses in CRO are used -
- A Lissajous pattern obtained on a CRO screen is a straight line. The frequencies of the two signals are
Which element in CRO is used to collect secondary emission electrons?
