Question

In a dual slope type digital voltmeter, an unknown signal voltage is integrated over 100 cycles of the clock. If the signal has a 50 Hz pick up, the maximum clock frequency can be

• A. 50 Hz
• B. 5 kHz
• C. 10 kHz
• D. 50 kHz

Answer 1

The correct option is B 5 kHz

$F_{CLK}=\frac{100}{n}\times f_s$

$(F_{CLK}{)}_{max}=\frac{100}{1}\times 50Hz$
[n minimum=1, to get max clk frequency]

= 5 kHz