The oven used for the M models is a 00105-xxxxx. Diagrams can be found as part of the HP 105 manual. This oven was used as well for 5061A and 5065A standards. Tom got a 5061 manual on his page. The first thing to check is the 110 V preheater. If you need further assistance contact me offline.
Hubert DB7ME -----Ursprüngliche Nachricht----- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Dave Brown Gesendet: Montag, 8. Dezember 2008 20:24 An: Discussion of precise time and frequency measurement Betreff: [!! SPAM] Re: [time-nuts] repairing an HP 5248M crystal oscillator If the oven in the M version of the 5245 and the 5248 is the same then I have some notes here re pulling it apart etc. I have a 5245M and had to replace a buffer amp transistor in the oven some years ago. The series regulator in the 'always on' power supply failed short and took it out - like the good little fast three legged fuse that it was..... I recommend that over voltage protection be added and a more rugged regulator pass transistor be fitted to the power supply while you have it on the bench, just in case. The 5248 supply may have these matters attended to- not sure. DaveB, NZ ----- Original Message ----- From: "Dave M" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, December 09, 2008 6:04 AM Subject: Re: [time-nuts] repairing an HP 5248M crystal oscillator > You can get an excellent PDF copy of the 5245M manual from Artek > (http://artekmed.startlogic.com/page3.html) for only $10 US. They > do good work there. > > -- > Dave M > > Life is like a roll of toilet paper; the closer it gets to the end, > the faster it goes. > > The oven on a 5248M is not working properly. I have the schematics > for > 48L however not the M. Does anyone have a schematic for an M model? > The > oven light comes on and dims, however the instrument appears to be > temperature sensitive. I believe this is a double oven unit. > > Thanks, Dan > _______________________________________________ > 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. ---------------------------------------------------------------------------- ---- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.9.15/1835 - Release Date: 7/12/2008 16:56 _______________________________________________ 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. _______________________________________________ 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.
