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RE: How to get the waveform...

Posted by Thorsten (M) on December 22, 2009 at 07:32:09

In Reply to: RE: How to get the waveform... posted by fmak on December 22, 2009 at 00:39:23:

Hi,

> I would still say that different probes do give different
> pictures, particularly with a digital scope.

Sure, however, as said, the picture was consistent and accurate.

> If you had said that it was a Dell problem then I'd probably
> understood better.

I don't think the problem was Dell specific. Generally their PC's are engineered at least as well as all the others using the OEM Motherboards etc.

The noisy USB power was the Dell's problems, however it is not alone in having this problem. sing fairly primitive means it was possible to get major improvements. But a dedicated low noise supply is a better option, where possible.

> Your lock problem is likely to be due to the frequency synthesis
> error that I described earlier.

No, it was the level. After the modification the lock problem disappeared.

> It may have been compounded by the Dell but I have not had any
> lock issues on different boxes.

I think it was compounded by the wrong impedance of the Musiland together with the wiring to the sockets (which is nothing remotely related to 75R) and the wrong impedance sockets (remember, I measured a unit that was completely stock, your measurements show a modified unit), together with other issues.

Good if you did not have lock issues. Then again, I did not know I had them until I had to debug why the software was constantly servicing the receiver interrupt at higher sample rates, so it could not do the other job's it was supposed to. Which is kind of annoying.

Ciao T
Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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