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university:courses:electronics:electronics-lab-speaker [28 Feb 2013 16:06] – [Procedure:] Doug Mercer | university:courses:electronics:electronics-lab-speaker [24 Jul 2017 16:17] – change amplitude value to peak-peak Antoniu Miclaus | ||
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===== Materials: ===== | ===== Materials: ===== | ||
- | + | ADALM2000 Active Learning Module\\ | |
- | Analog Discovery Lab Hardware\\ | + | |
Solder-less Breadboard\\ | Solder-less Breadboard\\ | ||
1 - 100Ω Resistor (or any similar value)\\ | 1 - 100Ω Resistor (or any similar value)\\ | ||
- | 1 - Loudspeaker, | + | 1 - Loudspeaker, |
===== Directions :===== | ===== Directions :===== | ||
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=====Procedure: | =====Procedure: | ||
- | Start the Waveforms | + | Start the Scopy software. |
A few words on why these setting should be adjusted. As the frequency is swept the AWG output is stopped briefly between frequency steps and the signal driving the speaker will be turned off. The speaker is a mechanical system with resonance and this step change in the driving signal will cause it to ring at the resonate frequency. In order to make an accurate measurement at the driving frequency we must wait for the ringing to die out. The amount of time needed will depend on the particular speaker being measured. The 40 mSec suggested above was the correct value for the speaker used in this example. Your results may vary depending on your particular speaker. Switching to the cosine window function gives a more accurate amplitude result. | A few words on why these setting should be adjusted. As the frequency is swept the AWG output is stopped briefly between frequency steps and the signal driving the speaker will be turned off. The speaker is a mechanical system with resonance and this step change in the driving signal will cause it to ring at the resonate frequency. In order to make an accurate measurement at the driving frequency we must wait for the ringing to die out. The amount of time needed will depend on the particular speaker being measured. The 40 mSec suggested above was the correct value for the speaker used in this example. Your results may vary depending on your particular speaker. Switching to the cosine window function gives a more accurate amplitude result. | ||
- | Hit the green Run Single | + | Hit the Run button. You should see the frequency response of the voltage across the loudspeaker and the current through the speaker (by measuring the voltage across the 100 ohm resistor). The data on the screen is plotted in dB so the vertical scale is not in volts. An example plot is shown in figure 3. Your speaker will probably look much different than this. |
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<WRAP centeralign> | <WRAP centeralign> |