Hello Dana,
thank you for your detailied description. I will try this out in the
next days.
Scopes became a right normal permanent instrument in the electronics lab
of time-nuts
like a multimeter for the electrician.
Before I connect a counter onto a signalsource which I want to
characterize I am first looking with the scope on it.
A few month ago I built an dual card for a quarz ofen oscillator from Eb...
After measuring the output frequency on both channels I was wondering
why this one gave absolute nonsense instead of the expected 10 MHz count.
After some experiments I hooked on the scope and looked on the signaltrace.
Instead of a pure sinusoidal signal which I assumed the scope showed a
totally
distorted multisinusoidal signal which had no definitive wavelength but
a overlapped
form with several peaks like a modulated sinusoidal carrier wave mixed
with with another sinusoidal signal with a frequency relation of 10 : 1.
After rerouting some circuit tracks and optimizing the shielding the
effect was gone.
So this was the reason why my scope became an every time instrument in
my lab.
--
mit freundlichen Gruessen - with best Regards
Christoph Kopetzky
Am 07.10.2018 um 23:03 schrieb Dana Whitlow:
Hello,
Here is the promised discussion (from about a week ago) of my scheme for
using a DSO to capture the information needed to produce detailed plots of
phase and frequency modulations of a noisy source under test.
Alas, the method is apparently inadequate for characterizing a source as
quiet as I feel I need for some future experiments, but I felt that the
method
itself (if implemented with better equipment) could be of interest as an
alternative to TIC-based methods. The text file also includes some
discussion
of a different method that I feel will probably be better suited to my
future
needs.
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