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Raymond A. Rogoway wrote about his Digital Oscilloscope (see below).
Is it true that having an ULI I do not need "Digital Oscilloscope"?
Can all John's demos be performed with Vernier's "Sound" for
Macintosh? What is the highest sampling rate of Sound? What are real
advantages of using Digital Oscilloscope?
Ludwik Kowalski
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Digital Oscilloscope cannot be used with the ULI. It is selfcontained. > It can operate with the internal mic on the Mac and
even has a feed-through > so that you can hear to sounds. You can
adjust the triggering point or let > it free run, just as a normal
oscilloscope. It also has a frequency meter > mode in which a
frequency meter (counter) is displayed in large numbers > instead of
the oscilloscope. What it lacks that the Vernier stuff has is > a
fast fourier transform feature. The Vernier ULI uses a software
package > called "Sound" in which you can have multiple screens,
triggering, and a > FFT function, along with curve fitting. The
software is cheap.