PASCO WA-9867 Sine Wave Generator - Manual (Page 11)

Model No. WA-9867 Applications
11 ®
Applications
Open Resonance Tube
The resonance tube shown here has both ends open and a fundamental resonance frequency of
120 Hz. It is set up to be driven by a speaker and Sine Wave Generator. (Note the position and
angle of the speaker relative to the end of the tube.)
There are two ways to use the Auto Play feature to demonstrate resonance. With the first method,
the Sine Wave Generator steps through a series of resonance frequencies. With the second
method, it scans slowly through a frequency range encompassing one resonance frequency.
Method 1: Step Through the Harmonics
1. Using the Frequency knobs, set the output to the fundamental resonance frequency of the tube
(120 Hz in this case). Listen carefully while adjusting to determine the optimal driving
frequency.
2. Press and hold the Store/Exit key to store the increment as 120 Hz (or whatever the current
output frequency is).