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Hi,

Dale wrote:
Absolutely, an analog scope is fine for digital signals.  IMHO a low end
analog scope would be far more useful than a low end digital scope, but
that's my opinion.  I have not used digital scopes extensively, but from
what I understand a cheaper DSO might nt have a hgh enough sample rate to
catch very short glitches.  You won't see a one-time glitch on an analog
scope either, but you won't miss any detail.

I agree with what Dale says especially with respect to digital signals;
this is where the low-end digital scopes are very useful. We have several
TDS-220s and we find them invaluable especially when debugging serial
comms/bit bash protocols; it is very easy to capture I2C sequences, for
example, which is very difficult using an analog scope. In the end, it
boils down to what you imagine you will use it for most.

I will say that when we introduced one of our contractors to the TDS-220,
he went and purchased his own almost the next day and he uses it day in-day
out.

Dan





 (Embedded     Dale Botkin <dale@BOTKIN.ORG>@MITVMA.MIT.EDU
 image moved   06/02/2002 13:34
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Absolutely, an analog scope is fine for digital signals.  IMHO a low end
analog scope would be far more useful than a low end digital scope, but
that's my opinion.  I have not used digital scopes extensively, but from
what I understand a cheaper DSO might nt have a hgh enough sample rate to
catch very short glitches.  You won't see a one-time glitch on an analog
scope either, but you won't miss any detail.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
        - Arnold Edinborough


On Wed, 6 Feb 2002, Dave Dribin wrote:

> On Mon, Feb 04, 2002 at 01:37:59PM -0700, Dwayne Reid wrote:
> > I consider a scope to be *essential* if you are going to be doing any
> > serious electronics work.  I use a dual trace analog scope (Tek 465) as
my
> > main tool - I use more it than I use any other instrument.  Even more
than
> > a multi-meter or DMM.  I reach for the scope probe whenever I need to
> > measure a voltage or see just the circuit is doing.
>
> Would an analog scope, like the Tek 465, be useful for a serial
> digital signal, like the PS/2 port on a PC?  I guess I'm asking, would
> a used Tek 465 or a used TDS 210 be a better buy for a
> beginner/hobbyist doing some PC integration projects?  From the looks
> of it, a used TDS 210 goes for about 3 times a used Tek 465, but if
> it's 3 times as useful, I may consider it.

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