Are you sure you are measuring the 4065A against the Tbolt? TBolt feeding the start and 4065A feeding the stop and a counter in time interval mode?
On Fri, Nov 14, 2014 at 3:26 PM, Ed Palmer <ed_pal...@sasktel.net> wrote: > FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in > some Datum FTS Cesium standards. I got mine from here: > > http://www.aliexpress.com/item/Free-shipping-10PCS-STEL-1173-CM-PLCC/2023682701.html > > I left positive feedback, not sure why it doesn't show. > > Shipping was very slow, but the chips appear to be NOS. There are no > scratches on the leads which suggests that they were never installed in a > socket. I was having trouble with one so I decided to sacrifice it to see > what was inside it. The die is labelled 'ORBIT B-100'. When I chopped out > the dead chip from my FTS-4065A, the bottom was stamped with the word ORBIT. > ORBIT Semiconductor works on FPGA to ASIC conversions. It looks like > Stanford used Orbit as a fab house. > > I'm currently measuring my 4065A against my Tbolt. After about 37 hours, > I'm still not seeing anything that I can attribute to the 4065A. All I'm > seeing is the Tbolt and the typical response that every GPSDO gives. I'm > looking at Total Deviation values of around 1E-13 at 100Kseconds. Frequency > offset error appears to be about 6E-13. > > All diagnostic status values are within spec. I had to adjust the signal > level from the tube - it was too HIGH! > > I decided to solder in a socket so that I won't have to go through any pain > if this chip dies in the future - and I now have spares! > > Ed > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.