hi,
AudioPrecision looks nice but it's way over my budget considering that
it won't be used on a daily basis.
Looking at the specs, the QuantAsylum audio card only seems to have AC
coupling (down to 1.6Hz) and their oscillosccope page is a bit short on
details.
Hacking a soundcard as an oscilloscope could be very convenient since it
benefits from all the standard audio softwares and can easily get beyong
the 2/4 channels, but it's limited to AC coupling, unless there are
soundcards that have DC coupled inputs? AFAIK most only provide DC outputs.
Furthermore having to do homemade matched probes and attenuators is not
very 'plug and play'.
Since bitscope seems to only provide 8-bit ADC, Picoscope is thus very
high on my list, in particular the 5000 series. I'm wondering whether
their Arbitrary Waveform Generator option is really worth it though.
@Andrew I just found a python wrapper based on ctypes
https://github.com/colinoflynn/pico-python
Thanks for all the feedback!
On 08/03/17 12:16, Roshan Wijetunge wrote:
Depending on how cheap and improvised you want to go, and how handy
you are with basic electronics, you can easily adapt your soundcard to
work as an oscilloscope. There are a number of guides on the internet
on how to do this, such as:
http://makezine.com/projects/sound-card-oscilloscope/
I have used the following variation with good results:
- Probe via resistor to mic input of mixer
- Mixer line out to line of USB soundcard
- Schwa Schope <http://www.stillwellaudio.com/plugins/schope/> plugin
running in any DAW host (e.g. Reaper)
I used this setup as it utilised components I already had available,
and it has proved very useful for debugging audio hardware, being able
to trace signals through a circuit as well as biasing amplifier stages
in pre-amps. Using the mixer gave me control over input signal range
though clearly you have to be careful with gain staging so as not to
introduce distortion to the signal.
I also improvised a signal generator using a Electro Harmonix Tube
Zipper guitar effects pedal. It's an auto-wah type pedal, but you can
set the resonance to maximum, sensitivity to zero and it generates a
nice clean stable sine wave.
Best Regards
Roshan
On 8 March 2017 at 09:57, Andrew Simper <a...@cytomic.com
<mailto:a...@cytomic.com>> wrote:
Picoscope make the cheapest 16-bit scopes around (USD 1000), the
16-bit stuff from Tektronix is a lot more expensive (USD 31000 -
that's right I didn't accidentally add an extra zero, it's x30 the
price). I would recommend using the Picoscope and use Python's easy c
bindings to call the Picoscope library functions to do what you want.
Cheers,
Andy
On 7 March 2017 at 22:59, Remy Muller <muller.r...@gmail.com
<mailto:muller.r...@gmail.com>> wrote:
> Hi,
>
> I'd like to invest into an USB oscilloscope.
>
> The main purpose is in analog data acquisition and
instrumentation. Since
> the main purpose is audio, bandwidth is not really an issue,
most models
> seem to provide 20MHz or much more and I'm mostly interested in
analog
> inputs, not logical ones.
>
> Ideally I'd like to have
>
> - Mac, Windows and Linux support
>
> - 4 channels or more
>
> - 16-bit ADC
>
> - up to 20V
>
> - general purpose output generator*
>
> - a scripting API (python preferred)
>
> * I have been told that most oscilloscopes have either no or
limited output,
> and that I'd rather use a soundcard for generating dedicated
test audio
> signals, synchronizing the oscilloscope acquisition using the
soundcard's
> word-clock. However not having to deal with multiple drivers and
clock
> synchronization would be more than welcome.
>
> A friend of mine recommended using Picoscope which seems well
supported, has
> a strong user community but no official support for python AFAIK.
>
>
https://www.picotech.com/oscilloscope/5000/flexible-resolution-oscilloscope
<https://www.picotech.com/oscilloscope/5000/flexible-resolution-oscilloscope>
>
> I also found about bitscope http://www.bitscope.com which looks more
> oriented toward the casual hacker/maker, seems more open-ended
and has
> python support, much cheaper too.
>
> What about the traditional oscilloscope companies like
Tektronix, Rigol ?
>
> Has anyone experience with any of those? or any other reference to
> recommend?
>
>
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