In Reply to: RE: Linear Power Supply or Battery on Mac Mini - pics posted by Ugly on December 23, 2014 at 08:25:20:
I mostly agree with you. But as I mentioned to fmak (who can't seem to understand), my measurements are part of a preliminary functional test, i.e. does it appear within reason and does it work?
It's true, for differential noise measurements like this you definitely have to measure right at the load to get a realistic idea of what is truly going on where it counts. Measuring upstream of the filtering will tell you very little about the power quality as seen by the load.
Absolutely! With hundreds of individual 'load points' (Vcc pins) to test within the computer, and the thousands of variables which can affect the results, we can only assume that the power at each 'load point' is sufficient for proper operation.
On a larger scale, I don't own a high-end spectrum analyzer to view the end result at the output of the external DAC or power amp. There are very few here who do. At least one manufacturer has posted a screen shot from an Audio Precision analyzer.
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Follow Ups
- RE: Linear Power Supply or Battery on Mac Mini - pics - AbeCollins 13:00:27 12/23/14 (7)
- billions of load points - Tony Lauck 10:08:27 12/25/14 (4)
- RE: billions of load points - Ugly 23:41:27 12/25/14 (2)
- RE: billions of load points - Tony Lauck 09:01:24 12/26/14 (1)
- RE: billions of load points - Ugly 19:39:38 12/31/14 (0)
- RE: billions of load points - AbeCollins 12:12:20 12/25/14 (0)
- preliminary functional test - fmak 01:20:17 12/24/14 (1)
- Simple question for fmak - AbeCollins 08:01:03 12/24/14 (0)