My Tektronix TDS794D by menu selection, allows YT, XY, and XYZ modes, where
YT is the conventional O-scope mode, XY mode allows two of the four input
channels to form the Lissajous pattern useful for FMT contests, and the XYZ
mode allows a third input channel to intensity modulate the Lissajous
waveform.
I would expect most if not all digitizing scopes to have at least the XY
feature.
-Doug Ronald
W6DSR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Manfred
Mornhinweg
Sent: Tuesday, June 20, 2017 02:35 PM
To: amps@contesting.com
Subject: Re: [Amps] About LP100A
Bill,
> As a technician who used to work at Tektronix, I can assure you that
> digital scopes can do everything that analog van do
Can a digital scope do Lissajous figures?
The ones I have used cannot. They simply don't have a horizontal input!
My own work with both analog and digital scopes makes me think that they
complement each other very well.
Very slow signals are essentially impossible to visualize on an analog
scope. Instead on a storage scope it's child's play. But analog storage
scopes are not the most common thing in the world, so it's here where
digital scopes come in, as almost all of them work as storage scopes.
What I have found hard to do with a digital scope is hunting for problems.
When I know beforehand what signal I have, and just need to measure it,
digital scopes work fine. Instead if I don't know what I have, it takes a
lot of effort to discover all details of a signal with a digital scope.
Instead analog scopes don't "lie": They always show you all detail a signal
has. The only thing you do is scale the image, horizontally and vertically,
to see the parts that interest you. That makes it easy to discover spikes,
transients, high frequency self-oscillations riding on the desired low
frequency ones, and so on.
By the way, my 40 year old Tektronix D755 is asking for retirement. Too many
totally worn potentiometers, contacts, etc, all of which are Tektronix
special parts. Can you, or anyone, recommend a good scope available for a
decent price? Are any of the Chinese ones good? I would love one that gets
well beyond 100MHz. Just two channels is fine.
Manfred
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