[time-nuts] OT: Power level reference
jfor at quik.com
Wed Dec 2 14:22:37 UTC 2009
Have you looked at a Dickie (?sp) Switch?
> In message <BA422CF5-53F0-443C-8AD1-EDC91A58464A at 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
> phk at FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
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