); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY
>C) I don't believe the Z3801A has 100ps single shot resolution and accuracy >(for resolution doesn't do anything without accuracy) until someone will >prove it to me. And even then it would be wasted resolution since the GPS >1PPS >source noise will totally swamp out any benefit a 100ps resolution >would give. Hi Said, I inadvertently measured the TI resolution of a Z3816A and it is a stable 100ps.The setup was a slightly modified VP receiver that has a phase locked LO (a 3325A locked to the OCXO) which replaced the normal UT GPS receiver in the Z3816. The measurements were made during a "hanging bridge" when the GPSDO servo loop is effectively open circuit for phase errors smaller than the saw tooth. The HP motherboard then averages 5 GPS pps samples so I guess the servo loop has control resolution of 20ps. A side effect of the 5 sample average is the opportunity to reduce the effective saw tooth error to 1/5 when the GPS LO is adjusted about 0.4 Hz high. This causes the GPS pulse position to advance about 20ns every second and repeat every 5 seconds creating a more stable average. Enjoy Peter _______________________________________________ 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.
