-------- In message <tilcc892a6ntfk64t2nljm92idr92df...@4ax.com>, David writes:
>The gain drift is specified at 2ppm per degree C. There are >provisions for a calibration cycle but that requires external >multiplexing. That's the really smart thing about this particular chip: You can drive the geophone calibration signal in through the second input and out onto the first, which eliminates the external calibration mux and the errors that usually cause. And yes, in seismology you do care about frequencies from 0.1Hz and up (0.01Hz if you're involved with the CTBT) and most voltage references will be stable enough for that. For longer term you calibrate your entire system, starting with the geophone, so the voltage reference is caught that way. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
