In a Cathode Ray Oscilloscope (CRO), how is a time delay measured?

Explanation:

In a Cathode Ray Oscilloscope (CRO), the measurement of time delay is achieved by using the time base control and measuring the horizontal shift. This method leverages the fundamental operation of the CRO, where the horizontal deflection is proportional to time, allowing for accurate time measurements of electronic signals.

Important Information:

Analyzing the other options:

1. By varying the intensity of the electron beam: This option is incorrect because varying the intensity (brightness) of the electron beam does not affect the time measurement. The intensity control adjusts the brightness of the displayed waveform but does not influence the horizontal deflection or time base settings.
2. By adjusting the brightness of the display: Similar to the first option, this method is not related to measuring time delay. Adjusting the brightness only changes how visible the waveform is on the screen and does not impact the time measurement.
3. By using the time base control and measuring the horizontal shift: This is the correct method for measuring time delay in a CRO. The time base control sets the horizontal deflection rate, and by measuring the horizontal shift of the waveform, the time delay can be accurately determined.
4. By changing the vertical deflection voltage: This option is incorrect as well. Changing the vertical deflection voltage affects the amplitude of the displayed signal but does not influence the horizontal deflection or time measurement.

In conclusion, the correct method for measuring time delay in a Cathode Ray Oscilloscope (CRO) is by using the time base control and measuring the horizontal shift, as this method directly relates to the time interval represented on the screen. The other options do not affect the time measurement and are thus not suitable for this purpose.