repak shawahb
I suppose I'll just have to waterboard myself

^
   

rsw@jfet.org


blogroll

        
Mon, 21 Nov 2005

frustration is...

...successfully debugging everyone's problem but your own.

There have been several breakthroughs with the chip thus far, and pretty much all of them have been as a result of some suggestion I made—"try it without the choppers," or "move the common-mode around," or whatever.

No one has come forward with any brilliant ideas regarding the gain error in my beloved monitor ADC. The precision is there, but some strangeness is causing channel-to-channel variation in the gain (to the tune of a couple percent). Fuckin' shit.

Here. Y'all read this and tell me what I'm doing wrong.


[ permalink | 3 comments ]

writebacks

Science Genius wrote


Have you tried plugging it into 220 volts?

repak wrote


Sure, several of the inputs range from -300 to +150 or so.

It reads about 2% high, i.e., 224.5 V when 220 is applied.

Beeyatch.

jim wrote

"tell me what I'm doing wrong"
Analog.




post a comment:

Save name/email/&c
Name:
URL/Email: [http://... or mailto:you@wherever] (optional)
Title: (optional)
Comments:
Key:
(Required)