The 10811 is the newer SC cut crystal oscillator. The 10544 would be the older AT cut oscillator.
At 09:43 PM 10/14/2006, you wrote: >I got an HP 5370A from eBay which did not work at power up (display was >messed up). After resetting all the ROMs and the CPU in their sockets, >the instrument came to life and now powers up without error message. It >has serial number 2128A01306. > >However, it seems that the reference oscillator output is severely >distorted (when I look at it with the scope), it looks more like 900mV >p-p of 30 MHz than 10 MHz, even though the instrument does not complain. >The output looks the same if I drive the external reference or use the >internal reference. When I measure the reference output with the 5370 >itself, I can make it display 10 MHz, 20 MHz or 30 MHz just by adjusting >the threshold pot. > >I have posted a picture at http://www.ko4bb.com/Test_Equipment/HP >5370A_ref_output.jpg > >Also, I went through the instrument check out, and the first step, page >3.4, shows how to read the period of the reference oscillator, and the >instrument displays 0.00 instead of 100.00. It obviously does not like >the reference output signal. > >The time base is an 10811-60111, I believe this is the "standard" time >base, as the manual lists the "high Stability" time base as a >10544-60011. The 10811 is a pretty nice "standard" time base :-) > >Otherwise, the time base seems very close, my reference oscillator (a >3586 synchronized to WWV until my GPS clock is finished) displays 10.000 >000 100 on the 5370. > >So it seems some of it is working, but the reference oscillator output >bothers me, and so does the impossibility to run the check out.. > >Any help in figuring out if this is normal would be appreciated. > > >Thanks in advance. > >Didier KO4BB > > >_______________________________________________ >time-nuts mailing list >time-nuts@febo.com >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
