8 Apr
2005
8 Apr
'05
12:24 p.m.
On Fri, 2005-04-08 at 12:06 -0700, Eric Smith wrote:
Ashley wrote:
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).
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.
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