Electrical Indicating and Test Instruments 1 Introduction 161



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1- MAQALA




Problems





    1. Summarize the advantages of digital meters over their analogue counterparts.

    2. Explain the four main alternative mechanisms used for affecting analogue-to-digital conversion in a digital voltmeter.

    3. What sort of applications are analogue meters still commonly found in?

    4. Explain the mode of operation of a moving coil meter.

    5. Explain the mode of operation of a moving iron meter.

    6. How does an oscilloscope work?

    7. What are the main differences between analogue and digital oscilloscopes?

    8. Explain the following terms: (a) bandwidth and (b) rise time. In designing oscilloscopes, what relationship is sort between bandwidth and rise time?

    9. Explain the following terms in relation to an oscilloscope: (a) channel, (b) single- ended input, (c) differential input, (d) time base, (e) vertical sensitivity, and (f) display position control.

    10. Sketch a block diagram showing the main components in a digital storage oscilloscope and explain the mode of operation of the instrument.

    11. Draw a block diagram showing the main components in a digital phosphor oscilloscope. What advantages does a digital phosphor oscilloscope have over a digital storage one?

    12. Illustrate the main components in a digital sampling oscilloscope by sketching a block diagram of them. What performance advantages does a digital sampling oscilloscope have over a digital storage one?

    13. What is a PC-based oscilloscope? Discuss its advantages and disadvantages compared with a digital oscilloscope.

What are the main differences among a digital storage oscilloscope, a digital phosphor oscilloscope, and a digital sampling oscilloscope? How do these differences affect their performance and typical usage?
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