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In a Cathode Ray Oscilloscope, the deflection sensitivity is defined as the ratio of:
Deflection on screen to the accelerating voltage
Deflection on screen to the deflecting voltage
Deflecting voltage to the deflection on screen
Beam velocity to the deflection voltage
Deflection on screen to the deflecting voltage
Deflection sensitivity is defined as the amount of deflection produced on the cathode ray tube screen per unit of deflecting voltage applied to the plates. It essentially measures the responsiveness of the electron beam to the applied electric field.
Deflection sensitivity is defined as the amount of deflection produced on the cathode ray tube screen per unit of deflecting voltage applied to the plates. It essentially measures the responsiveness of the electron beam to the applied electric field.
S=VdтАЛDтАЛ тАФ where S is deflection sensitivity, D is the deflection on the screen, and VdтАЛ is the deflecting voltage.
D=2dVaтАЛLlVdтАЛтАЛ тАФ where L is the distance from screen to plates, l is the length of plates, d is the spacing between plates, and VaтАЛ is the accelerating voltage.
When a potential difference is applied across the deflecting plates, an electric field is created, causing the electron beam to experience an electrostatic force. This force causes the electrons to follow a parabolic path, resulting in a displacement on the fluorescent screen. The sensitivity represents the gain or proportionality constant between the input voltage and output displacement.
Deflection sensitivity is inversely proportional to the accelerating voltage (VaтАЛ).
Increasing the length of deflection plates (l) or distance (L) increases sensitivity.
The unit of deflection sensitivity is VmтАЛ or VcmтАЛ.
Deflection factor, the reciprocal of sensitivity, is defined as DVdтАЛтАЛ.
High sensitivity allows for measuring very small voltage signals.
Provides a direct visual interpretation of signal amplitude.
High sensitivity often requires larger deflection plates which can cause electron beam loading.
Sensitivity is limited by the physical constraints of the cathode ray tube geometry.
Measurement of signal voltage amplitude in CROs.
Analysis of waveforms and frequency characteristics in electronics.
The deflection factor is measured in cmVтАЛ and is defined as the reciprocal of sensitivity.
Option A is incorrect as accelerating voltage is in the denominator of the deflection formula, but it is not the ratio defining sensitivity.
Option C defines the deflection factor, which is the reciprocal of sensitivity.
B is correct тАФ Deflection sensitivity is the ratio of the physical displacement of the spot on the screen to the magnitude of the deflecting voltage applied.
Always distinguish between 'sensitivity' (displacement per volt) and 'deflection factor' (volts per displacement); they are reciprocals of each other.