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- Question
A logic probe is placed on the output of a gate and the display indicator is dim. A logic pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
Options- A. The dim indication on the logic probe indicates that the supply voltage is probably low.
- B. The output of the gate appears to be open.
- C. The LOW indication is the result of a bad ground connection on the logic probe.
- D. The gate is a tri-state device.
- Correct Answer
- The output of the gate appears to be open.
- 1. Measurement of pulse width should be taken at a 50% mean of the:
Options- A. overshoot and undershoot
- B. rise and fall
- C. damping and ringing
- D. leading and trailing amplitude Discuss
- 2. A +5 V PCB power source that has been "pulled down" to a +3.4 V level may be due to:
Options- A. a circuit open
- B. a faulty regulator
- C. the half-split method
- D. a circuit short Discuss
- 3. What is the next step after discovering a faulty gate within an IC?
Options- A. repair the gate
- B. resolder the tracks
- C. replace the IC involved
- D. recheck the power source Discuss
- 4. The use of triggered sweep when using an oscilloscope provides more accuracy in which area?
Options- A. frequency
- B. amplitude
- C. graticule activity
- D. timing Discuss
- 5. The time needed for an output to change as the result of an input change is known as:
Options- A. noise immunity
- B. fanout
- C. propagation delay
- D. rise time Discuss
- 6. The duty cycle of a pulse is determined by which formula?
Options- A. Duty Cycle =
- B. Duty Cycle =
- C. Duty Cycle =
- D. Duty Cycle =
Discuss
- 7. The time needed for a pulse to increase from 10% to 90% of its amplitude defines:
Options- A. pulse width
- B. propagation delay
- C. rise time
- D. duty cycle Discuss
- 8. The determination of a digital signal's frequency and waveshape is best accomplished with which test equipment?
Options- A. an oscilloscope
- B. a multimeter
- C. a spectrum analyzer
- D. a frequency generator Discuss
- 9. The use of a multimeter with digital circuits allows the measurement of:
Options- A. pulse width
- B. voltage or resistance
- C. current
- D. pulse trains Discuss
- 10. Which device would best aid in shorted track detection?
Options- A. multimeter
- B. current tracer
- C. logic pulser
- D. oscilloscope Discuss
Testing and Troubleshooting problems
Search Results
Correct Answer: rise and fall
Correct Answer: a circuit short
Correct Answer: replace the IC involved
Correct Answer: timing
Correct Answer: propagation delay
Correct Answer: Duty Cycle =
Correct Answer: rise time
Correct Answer: an oscilloscope
Correct Answer: voltage or resistance
Correct Answer: current tracer
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