In message <[email protected]>, Magnus Danielson writes:
>The input calibration would be something in the similar way, What I did: Detune an OCXO slightly (I actually have a 9.99997 MHz OCXO from IsoTemp), feed it to PPSDIV, disable the discipline code in the PRS10, collect the measured input time stamps over some hours. Either you get a nice ramp, or you get som kind of demented staircase, in which case you try to figure out which of the calibration constants to mess with. An alternative is to feed the PRS10 output to a HP333x Synthesizer and have that generate your 10-epsilon MHz for the PPSdiv. This general "vernier" method can be used to measure all sorts of tricky stuff, from interrupt latencies in operating system kernels to stuff like the above. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
