Rylos said:
Mostly for digital timing of pulse and clock frequencies up to 20Mhz and
viewing synchronous and asynchronous serial data, byte sized packets. Also
use for viewing output waveforms of boost and buck converters and small
transducer frequencies of just a few mV p-p both from the device and at the
output stage of an amplifier. Storage not necessary and would prefer a
benchtop model. Multiplication of waveforms would be nice for VI product to
get an average value but I know this would mean a high dollar DSO.
I have been strongly considering a used Tek analog such as the ones I've
used at the local University, they have some old Tek 2225's that I'm hoping
they might auction off. I do see them from time to time used online.
Other than those specifics I would just use it to view various waveform from
things like timers, charge and discharge cycles of capacitors and general
purpose stuff like that.
okay, wit htthese infos I'd say stay with a Tek465 or 475. Or a Tek
2235. All 100MHz or higher analog.
Philips made few analog scopes with integrated anlogue multiplier
(especially for VI work applications). But that's in the 1975 to 1980,
so these units are really old now. I would not recommend to check the
used market for this, it's not worth the money.
The 2225 from university are nice 50 MHz scopes. Not built to the
durability a 465 or 2235 has been, but at least the work
satisfactorily. Tektronix had to serve the low-price end market with
these 2225, so that's the reason for the quality (or lack there of).
As the other postes say: for a 20 MHz digital signal, there is
considerabel aberration on the signal edges with a 50 MHz scope -- so
be aware of this.
If you can get these scopes cheap (80 to 120 $), in working condition,
then go for 'em. But keep in mind that a good 465 is also in the same
price region.
hth,
Andreas