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-Refer to Figure 9- 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?
A) The error is very small and is to be expected of a circuit of this type; the clock should be regularly reset.
B) The modulus of the counter has decreased, causing the counter to produce a lower output reference signal for the clock.
C) The modulus of the counter has increased, causing a drop in the output frequency of the counter.
D) The XTAL OSC is probably cooling off too much at night and consequently slowing down; the XTAL OSC should be temperature compensated.

Question

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-Refer to Figure 9- 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?
A) The error is very small and is to be expected of a circuit of this type; the clock should be regularly reset. 
B) The modulus of the counter has decreased, causing the counter to produce a lower output reference signal for the clock. 
C) The modulus of the counter has increased, causing a drop in the output frequency of the counter. 
D) The XTAL OSC is probably cooling off too much at night and consequently slowing down; the XTAL OSC should be temperature compensated.

Quizplus · Accepted Answer

The modulus of the counter has increased, causing a drop in the output frequency of the counter, which results in the clock running slow.

‪ -Refer to Figure 9- 12. the Circuit Is Used to Used