On 23 May 2011 at 18:09, Rob Jarratt wrote:
The guidance I have had is that for a PSU an
analogue 'scope is fine.
For logic then a logic analyser is what you need. Are you talking
about some other category of hardware?
Printers, disk drives, data acquisiton. Logic analyzers are useful
Odd.... I've repaired plenty of printers (impact dot matrix, daisy wheel,
thermal dot matrix, inkjet, laser, etc) and plenty of disk drives (hard
and floppy) and never had any problems managing with a good analogue
'scope and a logic analyser.
I've used plenty of DSOs over the years and don't really feel that
they're that useful for the sort of thing I do. If you use a DSO and it
works for you, fine. It's the end result (getting the device on the
bench, wherther you're designing it or repairing it working properly)
that counts. But I am convinced that it's possible to repair the H7140
PSU, and indeed jsut about all other classic computer devices with an
analouge 'scope. And I am certain that a good analogue 'scope is better
for this than a poor DSO.
beasts, but they don't tell you anything about the
*quality* of the
signal (e.g. ringing, edges, etc.), although some have "glitch"
detection. But we don't live in an exclusively analog world.
Don't we? One of Vonada's laws is something like 'Digital cirucits are
built from analogue parts'. And M.V.Wilkes once said to me soemthing like
'A digital circuit is like a tame animal, the analogue circuit is a wild
animal. Every so often the tame animal reverts to the wild' :-)
Before DSOs we had analog storage-tube scopes.
Why the past tense? Many of us still use storage tube 'scopes.
-tony