Sujet : Re: Low spec 'scope.
De : '''newspam''' (at) *nospam* nonad.co.uk (Martin Brown)
Groupes : sci.electronics.designDate : 28. Aug 2024, 17:05:47
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vanhss$3hatk$1@dont-email.me>
References : 1 2 3
User-Agent : Mozilla Thunderbird
On 28/08/2024 16:32, Don Y wrote:
On 8/28/2024 7:47 AM, Martin Brown wrote:
On 28/08/2024 08:39, Liz Tuddenham wrote:
The recent thread on high-end oscilloscopes has reminded me of a project
that I shelved some years ago and might be due for resurrection: I am
looking for a real-time display about 3" x 4" that can behave as an X-Y
oscilloscope with a bandwidth of about 100 Kc/s; a flat panel would be
ideal.
>
Currently I am using an actual X-Y oscillocsope to monitor the output
from a stereo gramophone cartridge, which allows me to check historic
discs for damage or faulty recording geometry. The tube is about 14"
long, which means it has to be a standalone shelf unit and I can't build
anything like it into portable equipment.
>
I think that Daqarta software can probably do about what you want using the PC stereo soundcard to digitise X & Y. 100kHz bandwidth might be pushing it but it should be fine for audio up to 20kHz.
Does it *simultaneously* sample each channel? Or, toggle between them?
I have never looked hard enough or at a high enough frequency to tell the difference. Audio demo's work best around 440Hz orchestral A which most people can hear well. Waveform shapes and sounds are fun demos.
The guy knows what he is doing so I expect it is simultaneous sampling of the waveforms to within a few memory cycles. Skew only becoming a problem at very high frequencies. It is cute there is a free trial period and you get to keep the (audio) waveform generator.
There is something similar for Android tablet/phones too but I don't think that one does X-Y Lissajous figures (I could be wrong about that). The waterfall spectrograph is quite a handy toy to have on your phone...
The advantage would be that you could locate the data acquisition
hardware separately from the (COTS) display.
It is a neat piece of software. Every now and then AV codes take against it because it does do a bit of rather low level IO access (obviously).
-- Martin Brown