Digital Frequency Measurement

Q. A counter timer has a basic clock of 16 MHz. The count value displayed is in error by 1 count. The frequency at which the error in the displayed value is the same whether the counter-time is used in the frequency mode of operation or period mode of operation is

1. 16 MHZ
2. 10 MHz
3. 8 MHz
4. 4 MHz

Q.

A full-wave rectifier is used to convert $\mathrm{n}-\mathrm{Hz}$ A.C into D.C., then the number of pulses per second present in the rectified voltage is.

1. $\mathrm{n}$

2. $\frac{\mathrm{n}}{2}$

3. $2\mathrm{n}$

4. $4\mathrm{n}$

Q. 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

1. 50 Hz
2. 5 kHz
3. 10 kHz
4. 50 kHz

Q. A Digital voltmeter uses a 10 MHz clock and has a voltage controlled generator which provides a width of $10\mu s/volt.$ A 10 V input signal will correspond to pulse count of ______

1. 1000
2. 100
3. 10
4. 10000

Q. A digital timer with four digit readout is stated to have an accuracy of 0.005 percent of reading, $\pm 1$ in the final digit readout is in $\mu s.$ Assuming that the instrument meets its specifications then the maximum likely error when the reading is $500\mu s$ is $\pm$ ______ $\mu s$

1. 1.25
2. 0.125
3. 1.025
4. 0.1025