[david gourley[_2_]]

Trevor said...news
On 7/06/2018 6:26 AM, geoff wrote:
On 7/06/2018 1:40 AM, Mike Rivers wrote:
On 6/6/2018 12:46 AM, Tim Sprout wrote:
How does one detect ultrasonic oscillations?

With an ultraoscilloscope, of course.Â* Actually, any oscilloscope
worth a hoot will display waveforms up to 500 kHz which, other than in
exceptional cases, is all you need to worry about. You can still find
50 year old Hewlett-Packard scopes for under $25, and you can learn a
lot about audio (and about oscilloscopes) with one.


Surely most of even the cheapest nastiest (but perfectly adequate)
scopes from the last 50 years do 10MHz ?

Yep, my first scope was made well over 50 years ago and did 10MHz. But
there have been some cheap audio scopes over the years that only did
1MHz. But of course even a 1MHz analog scope will still display
waveforms well above that frequency at a reduced level.

Trevor.


Still have mine, a Heathkit 10-12 (500kc) scope I bought at a Ham Fest 40
years ago. It needs a little TLC, but still very functional.

Always reminds me of the intro to "The Outer Limits" TV show.

david

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