Re: calibration, need help
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by Marso:
[QB]
I just think that something is wrong with the ambus card.
[QB]<HR></BLOCKQUOTE>
This is possible. I've seen it before with the early AD8000's. ADC (only) data is skewed at the TDM bus in such a way as to shift the bits by one, yielding a -6dB gain change. The AD8000 isn't by chance the 2nd interface on a "Y" cable to a D-24 card, is it? I remember debugging that particular configuration for them, and the symptom was similar to what you describe. I seem to remember that they fixed it too. You may want to check with them to see if you've got the correct firmware, etc.
I can't say for sure that you're seeing a timing problem with the AD8000, but the 6 dB shift is suspicious.
Are the gains okay with the Digi interfaces?
DC
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Dave Clementson
Digidesign Engineering
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