--- In Doepfer_a100@y..., "Andreas Lindholm" <andreas.k.lindholm@t...>
wrote:

> Is 20mhz sufficient for audio use and are there any other values

that one

> should look out for to get decent curves of you audio

My experience since I've had the scope (admittedly only about 4
months) is that 20MHz seems ample for audio - the only time I've had
it anywhere near its limit is when I've been looking at rise times on
pulses etc., and even then I didn't 'run out of steam'. The only thing
which seems to be essential is to make sure that you can use both
channels with either AC *or* DC coupling - the AC coupling capacitors
on my scope mean that low frequency square waves look nothing of the
sort: to see the true shape you need the DC coupling.

Features I have, most of which I suspect are standard on a dual beam
scope (I'm not an expert on such things!), and which I've used a lot:

- can trigger off either channel, or can align the trigger points
('vertical mode') - useful sometimes to prevent one or other signals
jittering
- can trigger from an external signal
- can display ch1 versus ch2 in x <-> y fashion, useful for looking at
phase relationships
- can select either ch1, ch2 or both
- can add ch2 to ch1, and can invert ch2, so adding gives ch1-ch2
(only used this very occasionally)
- can either sweep ch1 then ch2 alternatley ('ALT'), or it will switch
very quickly between both ('CHOP') - removes flicker at low frequencies.

These features seam to cover my needs, I've not found myself wanting
anything else! Maybe others out there might like to add to this

Tim

[The views expressed above are entirely those of the writer and do not
represent the views, policy or understanding of any other person or
official body.]