Re: Question about oscilloscopes for audio
- From: Don Lancaster <don@xxxxxxxxxx>
- Date: Wed, 15 Nov 2006 17:33:57 -0700
john jardine wrote:
"qrk" <SpamTrap@xxxxxxxx> wrote in message
news:uirml21fkfk18iukgsutvt2vijl4j8lj05@xxxxxxxxxx
On 14 Nov 2006 17:03:00 -0800, "David L. Jones" <altzone@xxxxxxxxx>
wrote:
Phil Allison wrote:
"PPP
** Groper alert !
I was reading the oscilloscope tutorial here:
http://www.picotech.com/applications/oscilloscope_tutorial.html
The section regarding vertical resolution specified the following
device:
http://www.picotech.com/audio_spectrum_analyzer.html
Also, from my searches in this group using "audio oscilloscope", I
found the following link:
http://www.syscompdesign.com/oscilloscope.htm
According to the tutorial, it states that for audio signals I should
go
for a scope with a higher vertical resolution (16 bits) so I can have
a
higher accuracy. However, most of the scopes I've seen including ones
in our university lab are 8 bits. For my application, I'm trying to
duplicate a headphone amplifier, does this mean that the Syscomp
Design
(and university lab) scopes would not be suitable for my project?
** For audio design and * troubleshooting * work - what you need is a
standard * ANALOGUE * scope.
Typically dual trace with 20 MHz vertical bandwidth or more.
Are none available in your lab ???
Using either 8 bit digital scopes or a PC soundcard as makeshift audio
scope
is plain dumb - the former suffer from poor image quality and aliasing
while the latter has insufficient bandwidth for what you intend doing.
Aliasing is a thing of the past now that virtually all DSO's (even the
low end ones) use real-time sampling (usually >10 times the bandwidth)
instead of repetitive sampling.
But yeah, agreed, a regular analog scope is what you need here.
Dave :)
I still have problems, on rare occasions, getting a modern DSO to
behave due to aliasing issues. Usually turn on the analog scope to
figure out what I'm looking at then set up the DSO accordingly.
For audio, noise, and odd digital problems analog scopes are the way
to go. If you need to measure distortion, use a decent spectrum or
distortion analyzer.
---
Mark
At a customers last week, had to use their new, Tek TDS3024 'scope. Must
admit to being somewhat leery due to a previous time waste with a HP model.
Yep!, right on cue the damned thing refused to display a 100Hz, 15V, 20uS
signal.
It looks like a girls handbag and about as much use :)
john
The myth continues through many generations that HP knew how to build oscilloscopes.
Their last decent scope was the 130C.
It has been stadily downhill ever since.
--
Many thanks,
Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml email: don@xxxxxxxxxx
Please visit my GURU's LAIR web site at http://www.tinaja.com
.
- Follow-Ups:
- Re: Question about oscilloscopes for audio
- From: SioL
- Re: Question about oscilloscopes for audio
- From: David L. Jones
- Re: Question about oscilloscopes for audio
- References:
- Question about oscilloscopes for audio
- From: PPP
- Re: Question about oscilloscopes for audio
- From: Phil Allison
- Re: Question about oscilloscopes for audio
- From: David L. Jones
- Re: Question about oscilloscopes for audio
- From: qrk
- Re: Question about oscilloscopes for audio
- From: john jardine
- Question about oscilloscopes for audio
- Prev by Date: Re: Serial Bus Choices
- Next by Date: Re: Question for Jim Thompson and other Brass Rats
- Previous by thread: Re: Question about oscilloscopes for audio
- Next by thread: Re: Question about oscilloscopes for audio
- Index(es):
Relevant Pages
|
