The HP 5328A that I have uses the EFC as a fine manual adjust. There is an accessory card that accepts the oscillator and the supporting fine manual-adjust circuitry is located there.
Bill, K8CU ----- Original Message ----- From: "Rick Karlquist" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Cc: <[email protected]> Sent: Friday, December 29, 2006 8:04 PM Subject: Re: [time-nuts] HP 5345A > Colin Bradley wrote: > > I just picked up a 5345A from eBay. This unit has a 10811 oscillator > > instead of the 10544 depicted in the manuals I have. The serial number has > > been removed. Does anyone know if there is an EFC adjustment for this > > counter or is the course control the only way of setting frequency? > > Colin > > I don't know of any instrument in the history of HP/Agilent that ever > used the EFC as a fine manual frequency adjustment. The EFC > was only ever used as a phase locking interface. The tuning adjustment > is adequate for annual calibration purposes (IE, you can set it > within 1 Hz, or 1E-7 if you are careful, and the expected annual > aging is in that ballpark). > > Rick Karlquist N6RK > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
