Not being able to suppress my interests for too long, I explored my newly acquired 5061A this weekend.
The problem was an oscillation in the A7 assembly, as determined by looking at the output at A7J6. I am not sure what I did to fix it but I removed all connections to the A7 and A8 assemblies, reconnected them, and no joy. I then removed the A7 assembly, checked the components that have frequently failed in the past on my other 5061A's, found no problems, loosened all the mounting screws for the PCB then re-tightened them, cleaned all the connections, reinstalled it, switched the 'HI' and 'LO' switch back and forth half a zillion times, left it in 'HI', adjusted the 2nd Harmonic to '40' on the meter, and, magically, everything worked. I suspect the problem will be back. I suspect a 'marginal' connection or a marginal component in the A7 assembly. I have some 'parts units' available for the next time the unit fails. Nonetheless, it has 'locked' for the past hour with a Beam I of about 13 nAmp, if my calculation is correct (-131.50 mV from the CS tube as connected to the cable from the tube to A7J1 and as measured with my Fluke 8050A with a 10 MOhm input resistance), and the output is 'locked' on my scope with it's trigger coming from my TBolt. I have ordered new batteries for the Option 02 battery pack although it even worked with only one 'dead' cell. I replaced the 'dead' cell with one that 'kinda works' from another old battery pack, and now even the backup battery pack is working, 'kinda'. Happy to answer any questions. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of J. L. Trantham Sent: Wednesday, February 22, 2012 9:25 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 5061's on ebay I'll do it. I work full time and this is my hobby. So, it may be a while before I get into it though. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of paul swed Sent: Wednesday, February 22, 2012 9:22 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 5061's on ebay Interested _______________________________________________ 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.
