Ian Iveson wrote:

Thought I might add that you should consider probes when you buy.
Decent ones can be hard to find cheap if they don't come with the
scope. For a dual trace obviously you need two.

Also, I would be interested to hear from others about differential
probes. I am about to go to the extreme (for me) of making one coz
I can't find s/h. My dual trace scope has an xy function but no
scalar addition. Does everyone have a diff. probe, and if not, how
do you manage without? Or is it usual for dual-trace scopes to
include diff. operation?

I think my ex-school 1Mhz scope is sufficient. I don't need to see
higher frequencies. I can measure them with my voltmeter.

cheers, Ian

"Jack A. Zucker" wrote in message
om...
Recommendations?

Most Dual Trace Scopes do not perform well in the Diff Mode
if they have one. That is because the combination of a pair of
single ended amps in the scope will not have much in the way
of common mode tolerance. To do that you need a front end
that is a true differential amplifier. Several of the older TEK
plug-ins did exactly that. To get good performance you also
need to have some way of adjusting the gain of one side of
the diff amp or one of the probes in order to cancel the
common mode. Cheeeeeeers, John Stewart