A. Voltage Measurements at 90 Hz

1. Turn on your function generator. It defaults to a sine wave with a frequency of 1000 Hz.
2. Set the Frequency to 90.000 Hz by using the decade buttons (below 100.000) to change to the tens place and turning the frequency knob.
3. Turn the voltage knob and set the Amplitude (V_max) to 3.000 V. Record thepeak-to-peak voltage (not the amplitude!) and frequency values in far-left section of Table 1.
4. Now, on your oscilloscope, change theVertical Scale (V/div) setting to something that should allow you to see the signal on the screen. (Hint: You want your 3 V amplitude wave to be as large as possible and have 8 vertical divisions in which to fit it). Set yourHorizontal Scale (s/div) setting to something between 500 s and 5 ms per division.Your V/div setting will be in yellow in the lower left corner, and your s/div setting will be in white in the lower right corner. Ignore the time in orange.
5. You should see a sine wave on your screen. If not, adjust theHorizontal and Vertical Scale settings until you do. After getting a sine wave, use theVertical Scale knob to make the signal as large as possible but still completely visible on the screen. If necessary, you can use the smallPosition knob in the vertical section to reposition the trace vertically.
6. Next, adjust theHorizontal Scale knob until you see one full cycle on the screen. A good practice here is to use the smallPosition knob in the horizontal section to put a peak just at the far left of the screen and then adjust theHorizontal Scale setting so that only one more peak appears on the screen.
7. Count the number of divisions on thex axis for one full sine-wave cycle and compute the periodT for one cycle from the s/div setting. Then, use the period to calculate the frequency of the signal. Calculate the percent error between your calculated frequency and frequency output by your function generator.
8. Count the number of vertical divisions on they axis for the peak-to-peak height of the sine wave pattern on the screen. Calculate and record the voltage in Table 1. Calculate and record the percent error between your calculated voltage and the voltage output by your function generator.
9. Record the frequency and voltage measured directly using the oscilloscope measurement tool. Calculate the percent difference between your calculated frequency, and the frequency measured directly using the oscilloscope measurement tool. Also, Calculate the percent difference between your calculated voltage, and voltage measured directly using the oscilloscope measurement tool.
10. You can use the picture posted below " Oscilloscope 90Hz " to record your data for part A.

Figure 5.Oscilloscope 90Hz

Table 1. Voltage Measurements at 90 Hz

Signal generator	Scope # of div	Scope # s/div	T	f	%Error	Direct measurements from Scope	% Differ
f = 90 Hz

Signal generator	Scope # of div	Scope # v/div	Vp-p	%Error	Direct measurements from Scope	% Differ
Vp-p