Re: Basic oscilloscope recommendations

Hammy wrote:
On Tue, 12 Jun 2007 11:57:29 GMT, mike <spamme9@xxxxxxxxx> wrote:


For slow signals, memory depth is an important parameter.
Draw the waveform you want to look at.
Put dots on it representing samples close enough together
so you can see what you want to see. Figure out the time
between samples. Then count how many of those samples
will be needed to cover the area of interest. If you expect
to see 10 MHz. bandwidth stuff over a whole 10 second interval,
you're gonna need a LOT of memory depth...times 4. If you can't afford the
memory, you're gonna need delayed triggering or some other
means to see what you want to see.

Do you really think memory depth is all that important?

Only if you want high resolution for a long time.
Do the math. Acquisition time divided by the time between samples
equals the memory depth requirement.
Yes, there are different techniques, but not typically found on entry-level scopes.

When you can
just hook up a DSO to your PC via USB or RS232 and record the waveform
for as long as you need, save it in a wmv file and review at your
leisure.

YOUbetcha! IFF your DSO has the capability to spit out real-time data.
AND your PC has the port and the capture software and the I/O bandwidth
to acquire the data. And if you have the software to transform it into wmv, although I don't know why you'd want that.
Remember, we're talking 10MHz. analog scope bandwidth here.
Or am I missing something?
yes

Don't skimp on a scope. It's your best tool for a lot of
design/debug situations. Requirements change, and waveforms
are NOT slowing down.
mike

I agree.


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