28119 Parallax Inc, 28119 Datasheet - Page 51

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

Specifications of 28119

• Lead Free Status: Contains lead
• Accessory Type: Oscilloscope
• Interface Type: USB
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

ACTIVITY #3: DUAL SINE WAVE MEASUREMENT
The BASIC Stamp’s
on the same pin. In this step, we’ll add the second frequency. Pure tones are generated by
single sine waves. However, most tones you hear coming from your average electronic
consumer goods are actually mixed tones. The previous exercises generated a pure tone,
while the next exercise combines two different frequencies. In this way you will be able
to hear, and see, the difference between pure and mixed tones.
√
√
√
√
First move the vertical cursors to the centers of the two peaks in the middle to
measure the frequency of the sine wave. You should get 500 Hz.
Record your ∆ V and f measurements, and make a note about volume and pitch.
Repeat this process for five more frequencies in the 1000-5000 Hz range, again
making a note of your ∆ V and f measurements, volume and pitch. Hint: try
setting the Mouse Function switch to Zoom when measuring the 5000 Hz signal.
Make a chart of your data. What can you infer from your five amplitude
measurements?
FREQOUT
command provides the ability to generate two sine waves
Figure 3-9:
500 Hz
frequency