I have several 10811. Pin 6 on the edge connector is EFC input, Pins 2, 4 and 5 are GND.
The HP Service Manual is out there on the web. It's worth a search. One of my units spent several years on the shelf. I put it back in service using a Motorola UT+ GPS receiver and Brooks Shera regulator to discipline the oscillator. After half a year continuous on, the ageing drift is not yet quite zero. EFC voltage is still drifting at ~<10-20 mV/month. Regards, Bill, NL7F On Mon, 22 Jul 2019 01:53:14 +0000 (UTC), Perry Sandeen via time-nuts wrote: >Yo Bubba Dudes!, >I bought a HP 10811 from ebay for $36 and shipping. >I installed it in my HP 5335a counter.- After running continuously for about >90 days it was down to about 4 to 6- parts in -10.- I couldn't adjust it for better accuracy as HP in their infinite and inscrutable wisdom provided a edge connector for the 10811 but didn't make provision for EFC one had only the course adjustment.- Sheesh! >Now maybe I was very lucky in my ebay purchase.- On ebay prices seem to go >from $125 to around $60.- One of the lower priced sellers advertise that their 10811's are *tested* but no details. >Regards, >Perrier >_______________________________________________ >time-nuts mailing list -- time-nuts@lists.febo.com >To unsubscribe, go to >http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >and follow the instructions there. Bill Beam NL7F
_______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.