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In a digital voltmeter, the oscillator frequency is 400 kHz and ramp voltage falls from 8V to 0 V is 20 m sec. The number of pulses counted by the counter is __________
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- 8000
- 8100
- 8500
- 8012
Correct Option: A
Assuming that gate opens when the ramp is 8V and closes when the ramp reached zero.
∴ Number of pulses counted by counter = 400 × 10³ × 20 × 10–3 = 8000.
