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Quiz: On oscilloscopes, Part 3

25 Apr 2016  | Martin Rowe

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The uses of a digital oscilloscope are many. And it is because of that fact that there is no scarcity of quiz questions for the past few weeks. This week marks the conclusion of a three-week series on oscilloscope quizzes based on "Oscilloscope tricks article by Arthur Pini. The questions below come from Oscilloscope tricks 21 – 30.

As always, answers appear on the last page.

1. According to the article, which are the levels used to measure a signal's rise time?

a. 5% to 95%

b. 20% to 80%

c. 0% to 100%

d. 10% to 95%

e. 10% to 90%

f. 5% to 90%

signal's rise time

Figure 1: Rising signals

2. When making power measurements, you can plot the current through a power switching device like a FET (field-effect transistor) as a function of:

a. VDS

b. VGS

c. VGD

d. RDSon

e. None of the above

power switching device

Figure 2: Power switching device current

3. Why would you use a constellation diagram?

a. To measure bit-error-ratio in wireless signals.

b. To look at data states of phase or phase-amplitude encoded data

c. To measure the frequency and phase response of a wireless signal.

d. To measure The power in a wireless signal.

e. All of the above

diagram

Figure 3: A constellation diagram


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