# Determine the deflection sensitivity (in m/V) of a CRO, when the value of the deflection factor is 0.5 V/m.

Determine the deflection sensitivity (in m/V) of a CRO, when the value of the deflection factor is 0.5 V/m.

#### SOLUTION

Deflection sensitivity of the CRO is given as

Deflection sensitivity = 1/deflection factor

Deflection sensitivity = 1/0.5 = 2 m/V

The deflection sensitivity of a magnetic deflection cathode ray tube is defined as the amount of spot deflection on the screen when the potential of 1 volt is applied to the deflection plate.

In most CROs, the deflection sensitivity is expressed as the ratio of input voltage to the length of the trace.

In the electrostatic deflection, the spot is deflected on the screen by applying voltages on the vertical or the horizontal deflecting plates. The dc or peak-to-peak ac voltage applied to the deflects ing plates to displace the spot by 1 mm on the screen is termed the deflection factor. The reciprocal of the deflection factor is called the deflection sensitivity. The deflection factor la usually expressed in V/mm and deflection sensitivity in mm/V.

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