From: Dr Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] HP 10811A/B OCXO OP/SRV manual is onlineathparchive.com AND HP 5501B manual. Date: Wed, 08 Nov 2006 11:25:44 +1300 Message-ID: <[EMAIL PROTECTED]>
> To measure the Allan variance you need at least 2 (preferably more) > stabilised lasers and a mixer (photodiode) plus a suitable amplifier to > produce a beat signal for analysis. > The beat frequency may be as high as 100 MHz with a pair of 5501s > (frequency/wavelength accuracy of 0.1ppm) so the photodiode and > associated amplifier will need adequate bandwidth. It seems like three 5501s, optical splitters/joiners and a fairly normal counters should allow for a three-cornered hat and then should the Allan variance and friends be possible to measure. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
