In message <ba422cf5-53f0-443c-8ad1-edc91a584...@cq.nu>, Bob Camp writes:
>The accuracy / flatness of the detector is only one part of the problem. > >In an RF system, the match to the detector can be a significant >part of the error. If some of the power is reflected it messes up >the reading .... No disagreement from here on that. What I played with, was a 50 Ohm termination a rotating mechanical shutter and a IR sensor to see if it would be possible to level three different frequencies to the same power-level, for calibration of a HP3458A. For this particular _relative_ power measurement, I think the method has merits, it it may be possible to use it to calibrate relative to DC as well, thus making the calibration absolute, but I need to work on the mechanical setup some more. -- 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.
