Moin,
Thanks a lot for all the answers! On Tue, 01 Nov 2016 09:50:38 -0500 David <[email protected]> wrote: > 1. Thermocouples and temperature gradients - this is a huge problem > and special attention will need to be directed toward the layout and > maintaining an isothermal environment. Careful design is required to > get the specified drift performance out of chopper stabilized (10nV/C) > and low drift operational amplifiers (100nV/C before trimming or > grading). Hmm... I guess I will have to put everything into a machined block of aluminium or even copper/brass/bronze to keep the temperature gradients low and temperature variations slow. > 5. Pink Noise - 1/f noise increases as frequency decreases. Chopper > amplifiers have flat 1/f noise so are invaluable below about 1 Hz. I was thinking about using low noise opamps (probably LT1128 or LT1677) with offset compensation using a LT2057 on each of them. This should at least kill the 1/f noise and I would guess also most of the opamp induced temperature variation. Does that make sense? Or should I skip the low noise opamp and use the LT2057 directly with some second order LP filter with 100Hz-1kHz bandwidth? Attila Kinali -- Malek's Law: Any simple idea will be worded in the most complicated way. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
