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Clive 12th March 2011 05:51 PM

Software Oscilloscope
 
On the WDPhono 3.18uS thread I mentioned a software oscilloscope I use for checking the azimuth of my cartridge in conjunction with the HFN test record (side 2, band 5 on my version). The same software could be used to set the HF trimmer on the Phono3. WD probably can't recommend any particular freeware as they could need a commercial license if they were to do this, but we can use this software for personal use legally. The scope I downloaded is found at:
http://www.zeitnitz.de/Christian/scope_de

When using this software you need to ensure your PC input is stereo (if you need this).

Here is what my how my cartridge measure with azimuth properly set, note that one channel is at a slightly lower level than the other and some dust probably messed up up one channel a fraction in this first image:

http://i43.photobucket.com/albums/e3...eyeandears.jpg


Here the azimuth is out in one direction:

http://i43.photobucket.com/albums/e3...sclockwise.jpg


Here azimuth is out in the other direction:

http://i43.photobucket.com/albums/e3...nter-clock.jpg

colin.hepburn 12th March 2011 06:43 PM

Re: Software Oscilloscope
 
Well I have just tried to install the scope it tell me no sound card was found I am using windows 7 my sound card is High Definition Audio Device which is built in on the mother board :eek:
http://i204.photobucket.com/albums/b...2_01/scope.jpg

Clive 12th March 2011 06:50 PM

Re: Software Oscilloscope
 
Try the 1.40 beta version? Maybe that's more 7 friendly? My installation was on an XP laptop, motherboard soundcard.

colin.hepburn 12th March 2011 07:57 PM

Re: Software Oscilloscope
 
Well I won’t be using this I afraid both versions do not run in windows 7 IE blocks versions 1.40 plus there’s no uninstall plus it puts files very where I now have to clean my reg out full of spy-ware do not go near this :eek:

Dave Cawley 12th March 2011 08:06 PM

Re: Software Oscilloscope
 
As well as the above. What is the input impedance and is it static over the frequency range. And also the frequency response, is it flat and does it stay flat at all input levels? And is the input floating from ground?

Regards

Dave

NickG 12th March 2011 08:25 PM

Re: Software Oscilloscope
 
Quote:

As well as the above. What is the input impedance and is it static over the frequency range. And also the frequency response, is it flat and does it stay flat at all input levels? And is the input floating from ground?
The input is the input of your sound car, so only you can answer those questions.

My only problem with using a sound card for setting up the phono, is you need to be able to see the square wave response and I would think that at least 200kHz bandwidth would be needed to get any meaningful results. You also need a source of square waves and a inverse riaa circuit of some sort.

Clive 12th March 2011 08:27 PM

Re: Software Oscilloscope
 
Quote:

Originally Posted by Dave Cawley (Post 72760)
As well as the above. What is the input impedance and is it static over the frequency range. And also the frequency response, is it flat and does it stay flat at all input levels? And is the input floating from ground?

Regards

Dave

The soundcard was plugged into my preamp "record out".

Clive 12th March 2011 08:29 PM

Re: Software Oscilloscope
 
Quote:

Originally Posted by colin.hepburn (Post 72759)
Well I won’t be using this I afraid both versions do not run in windows 7 IE blocks versions 1.40 plus there’s no uninstall plus it puts files very where I now have to clean my reg out full of spy-ware do not go near this :eek:

I'm not surprised this freeware uses cookies to keep track of usage. They'll want to ensure any commercial usage is logged.

pre65 12th March 2011 08:38 PM

Re: Software Oscilloscope
 
Quote:

Originally Posted by colin.hepburn (Post 72759)
Well I won’t be using this I afraid both versions do not run in windows 7 IE blocks versions 1.40 plus there’s no uninstall plus it puts files very where I now have to clean my reg out full of spy-ware do not go near this :eek:

I use "Agent Ransack" for finding and removing files where no other method works.

And it's free.

colin.hepburn 12th March 2011 08:44 PM

Re: Software Oscilloscope
 
Yep no worries thou
I have seen thing about reverse riaa somewhere and which i have just found it again if its what is meant by reverse riaa it maybe of interest http://sound.westhost.com/project80.htm


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