GATE EE 2017 Set 1 — Question 12
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Electrical & Electronic Measurements → Electronic & Digital Instruments → Oscilloscopes & CRO
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Question
The slope and level detector circuit in a CRO has a delay of . The start-stop sweep generator has a response time of . In order to display correctly, a delay line of
Correct answer
(A) 150 ns has to be inserted into the y-channel
Solution
In a CRO, the vertical signal (y-channel) must be delayed to allow the horizontal sweep (x-channel) to start before the signal reaches the vertical deflection plates. This ensures that the leading edge of the signal is visible on the screen.
Total delay in the horizontal path = Delay in detector + Response time of sweep generator
Total horizontal delay = .
Therefore, a delay line of must be inserted into the y-channel.
Total delay in the horizontal path = Delay in detector + Response time of sweep generator
Total horizontal delay = .
Therefore, a delay line of must be inserted into the y-channel.
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