GATE EE 2017 Set 2 — Question 47
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Electrical & Electronic Measurements → Electronic & Digital Instruments → Frequency Counters
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Question
A digit timer counter possesses a base clock of frequency . When measuring a particular input, the reading obtained is the same in: (i) Frequency mode of operation with a gating time of one second and (ii) Period mode of operation (in the x 10 ns scale). The frequency of the unknown input (reading obtained) in Hz is ________.
Correct answer
10000 to 10000
Solution
Let be the unknown input frequency.(i) In Frequency mode with gating time :
Reading .(ii) In Period mode with scale :
Base clock frequency .
Reading . Since the scale is given as "x 10 ns", and , the reading is simply the number of clock cycles in one period of the input.
.Given :
.
Reading .(ii) In Period mode with scale :
Base clock frequency .
Reading . Since the scale is given as "x 10 ns", and , the reading is simply the number of clock cycles in one period of the input.
.Given :
.
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