Oscilloscope question

[Guy Sotomayor]

On Fri, 2005-04-08 at 12:06 -0700, Eric Smith wrote:
> Ashley wrote:
> > What kind of scope would I need and how much does one cost?
> 
> Assuming that you want something good but cheap, your best bet is
> probably to try to find an old Tek 465.  It's a good, solid two-channel
> 100 MHz scope.  ISTR that they show up on eBay frequently, but as
> with anything on eBay, there's no telling what condition it would
> really be in.

I agree.  I got a Tek 465 on e-bay a couple of years ago for ~200 or so.
They show up with some regularity and at the time I got mine there were
several up at once.  I chose one that was a bit more expensive because
the seller indicated that it was working and had been recently
calibrated.  Some of the cheaper ones were "as-is".  But YMMV.

It's also a nice scope because it's dual trace (which many things you'll
need to use it for will be easer with dual trace).  It's reasonably
portable and has a pouch on top for holding the various bits (like scope
probes).

> 
> Ideally you'd get one with probes, as new scope probes are somewhat
> pricey.
> 
> Note that you need a scope that has a rated bandwidth substantially
> faster than fastest digital signals you expect to probe.  For instance,
> with a 100 MHz scope you're not actually going to get very good results
> probing a 50 MHz square wave.  But 100 MHz bandwidth should be sufficient
> for anything you'll find it most PDP-11 CPUs.
> 
> Eric
> 
> 
-- 

TTFN - Guy