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# Discuss how to most accurately make measurements of amplitude and period from an oscilloscope

Discuss how to most accurately make measurements of amplitude and period from an oscilloscope.

What is the difference between adjusting the volts/div dial on the oscilloscope and adjusting the amplitude on the function generator (they both appear to stretch or compress the displayed waveform vertically)?
Adjusting the volts/div dial on the oscilloscope: changes the movements of the sine waves (but not noticeable)
Adjusting the amplitude on the function generator: changes the voltage (decrease or increase the actual voltage of the electrical signals.

What is the difference between adjusting the sec/div dial on the oscilloscope and adjusting the frequency on the function generator (they both appear to stretch or compress the displayed waveform horizontally)?
Adjusting the sec/div dial on the oscilloscope: changing what the electrical signal looks like on the screen across time but does not change the signal
Adjusting the frequency on the function generator: changes the number of cycle per seconds shown on the oscilloscope but changes the signal]

Discuss how to most accurately make measurements of amplitude and period from an oscilloscope (with reference to the volts/div and sec/div settings). Hint: try measuring the period accurately with many cycles of the waveform present.
To measure the peak-to-peak amplitude and period of three different signals, count the divisions (voltage/divisions & seconds/divisions) and multiply by the range or timebase setting

example:

2 v/div (y-axis) & 100 s/div (x-axis)

y-axis: 3.5 x 2 = 7V
x-axis: 10 x 100 = 1000 ms = period
freq. = 1/period
freq. = 1000/1000
= 1 Hz

Calculate the frequency of the waveforms you observed from the period you measured. (Be careful not to forget the multiplier [milli or micro] when punching the numbers into your calculator). Do the frequencies approximately agree with the readings from the function generator frequency control?
use the frequency formula f = 1/T -> T =1/f
conversion 1Hz (1 cycle per sec) -> 1kHz (1000 cycle)
Result 1:

T = 1/f = 1/10,000 sec

F= 10 kHz = 0.001 sec
= 0.1 ms (distance between amplitude)

6.5 Assume you want to observe a 10 kHz sinewave with an amplitude of 0.05 volts. What settings for volts/div and time base would be most appropriate, if you wanted to see at least 2 complete cycles of the waveform?

Two cycles

Conclusion:

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Discuss how to most accurately make measurements of amplitude and period from an oscilloscope

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