Forums > MaxMSP

Oscilloscope and MAX

July 6, 2008 | 3:34 pm

Hey guys

I just found an oscilloscope on the street yesterday!
[like this one ->] http://theelectrostore.com/images/moreInfoImages/oscilloscopes/oscilloscope-tektronix-2445B-7cs.jpg

There is an IEEE-488 port on the rear end on the thing. I’ve read that one could use that to send the info from the oscilloscope into a computer and:
* Take measurements with the scope
* Put the measurements in a computer file
* Analyse the data with Mathcad, Matlab, Excel, etc.

I was thinking about getting a cable like this to send the info from the osc to my computer:

http://www.techsoft.de/htbasic/pictures/ines_usb2s.jpg

So the question is, do you guys have any idea or even experience with what you could do to route the signals from the oscilloscope into Max/MSP?

My idea was to send some sort of signal into the osc to get some sort of waveform and then "modulate" the wave on the osc and get MAX to measure how the wave looks on the display and make some changes on rulers and knobs based on the data received from the osc.

Hope you guys can help!


July 7, 2008 | 10:25 am

Daniel schrieb:
> I just found an oscilloscope on the street yesterday! [like this one
> ->]

lucky you, this sort of gear is pretty pricey if you need it…

> There is an IEEE-488 port on the rear end on the thing. I’ve read
> that one could use that to send the info from the oscilloscope into a
> computer and: * Take measurements with the scope * Put the
> measurements in a computer file * Analyse the data with Mathcad,
> Matlab, Excel, etc.

I’d try to get hold of a manual. You might find it online…

> I was thinking about getting a cable like this to send the info from
> the osc to my computer:
> http://www.techsoft.de/htbasic/pictures/ines_usb2s.jpg

Check out first what protocol its using. I guess it will be simply
serial, which you could talk to with the serial object…

> So the question is, do you guys have any idea or even experience with
> what you could do to route the signals from the oscilloscope into
> Max/MSP?

The manual will be your friend…

> My idea was to send some sort of signal into the osc to get some sort
> of waveform and then "modulate" the wave on the osc and get MAX to
> measure how the wave looks on the display and make some changes on
> rulers and knobs based on the data received from the osc.

Oscilloscopes don’t alter the signal, they measure it…
And there is a the scope object in Max which will do the same as an
oscilloscope. The big difference between a real one and a software one
is the frequency range. The real one will deal with signals into the MHz
range, the Max one will only be able to deal with half the sampling rate…

Stefan


Stefan Tiedje————x——-
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July 8, 2008 | 10:43 am

Hi !

I am not quite sure this port can be used for input on the Osc point of view. It is used most of the time to send data/graphs to a printer to have a "hard copy" of your measure. But usualy not to control the Osc.

And I don’t really get where you going with this idea…

But the best option is to try to find the Osc Manual indeed.

Anyway, if it is recognize as a USB device by your computer (with the cable you showed) you should be able to use the hi object to get the data. Then you need to built a parser in Max depending on the protocol used by the Osc.

Stefan is right, you were lucky to find one of these. Even if it is quite an old model now, it is still very useful and pricy !

Cheers


July 8, 2008 | 2:47 pm

Hey thanks for the replies! I will go look for some sort of manual. I haven’t got the osc here with me right now so unfortunately, I can’t see what brand and type it is. (It’s at a friends place right now – a heavy fucker! not the kind of type you carry with you in the bus)

And yeah, I guess I was quite lucky to find it. I could tell I’ve found something valueable from a long distance when I saw it. Next to it was some old pc-monitors, a lot of printboards with cables I couldn’t tell what was for and many types of electronic gizmos with knobs and stuff. I’ll take a picture of everything I gathered next week when I’ve brought it all home to my own place.

But I thought that maybe one could use the print data that was sent into the computer. Like "if that knob is turned up, the curve is increasing, so increase this ruler/knob ind MAX/MSP as well"


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