I have a small collection of 10811 and similar oscillators here, collected from hamfests rather than china (and mostly pre-ebay).
What sort of testing regime would you put them through ? I don't have anything as exotic as a timepod but I do have an HP53131A, the Tait Rb source, and a KS-24361 set up. And always keen to get hints on the acquisition of new toys ! On Thu, Feb 18, 2016 at 12:09 PM, Bob Camp <kb...@n1k.org> wrote: > Hi > > It is *much* better to have an OCXO that you do not need to test to death. > There is simply to much testing to do. A modern factory does not test the > quality into the product (of any sort) they design in and build it in. The > same > is true of the normal customer for virtually any component. They make sure > the parts come from somebody they can trust and save a lot of testing time. > > That said, yes, I have a pile of scrap parts sitting in front of me as I > type this. > It’s a hobby. Time does not count. It lets me play with all sorts of toys > doing > the testing. I occasionally learn things in the process. Mostly I learn > that > my hope of a 100% perfect batch is still a dream …. > > Bob > > > > > On Feb 17, 2016, at 9:56 PM, time...@metachaos.net wrote: > > > > Bob, > > > > In this case, I know how it was taken off the board - it wasn't. They > just cut > > the board around it. I had to remove it myself. Nice thing about that, > is that > > I got a nice plastic, pre-formed part that fits between the board and the > > OCXO, probably as an insulator. > > > > You are also right about the number of things that you need to test to > make > > sure that one of these is fully functional. However, this is a "starter" > OCXO > > for me and I don't yet have the equipment to perform the tests. The best > that > > I can do is to make sure that, when powered up > > > > 1. I see something that sort of looks like a sine wave at a reasonable > > magnitude. > > > > 2. My 2465B CT frequency counter thinks that it is somewhere near 5Mhz. > > > > 3. If I apply gnd, or VRef to the adjustment pin I see the frequency > change > > at least a small amount. > > > > Without more equipment, there isn't much more that I can do to test. > Unless > > you have some suggestions? > > > > > > Mike > > > > > >> Hi > > > >> Best guess is these things get taken off the board with either a big > torch or a charcoal fire. > >> You can ask Mr Google to dig up pictures of the process. Depending on > just how quick > >> they are, the insides of the OCXO can easily be reflowed. The > likelihood of it reflowing and > >> cooling back to a reliable joint … not real good. > > > >> Bob > > > >>> On Feb 17, 2016, at 5:16 AM, Andrea Baldoni <erm1ea...@ermione.com> > wrote: > >>> > >>> On Tue, Feb 16, 2016 at 07:58:21PM -0500, time...@metachaos.net wrote: > >>> > >>>> I just received a 5Mhz OCXO from eBay (MTI 260-0624-D OCXO). After > testing it, > >>>> it is clear that it is defective. > >>>> > >>>> 1. It never heats up. > >>>> 2. The reference voltage is zero. > >>>> 3. Only noise is seen on the output pin. > >>> > >>> I had the same issue with some of them. It's very likely that the > internal > >>> solder connections from pins to PCB are broken, at least, the one for > power. > >>> It happens because the inner oven is heavy and there isn't any thermal > >>> insulator (besides air) to keep it from moving. > >>> > >>> Wheter the crystal has been damaged or not, it's unknown. I had one > where the > >>> crystal actually fell off from its supports too. > >>> > >>> I posted a link to photos of the internals, time ago. The link is dead > now > >>> and I don't think to have the photos anymore but perhaps someone > downloaded > >>> them. > >>> > >>> Best regards, > >>> Andrea Baldoni > >>> _______________________________________________ > >>> 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. > > > > > > > > -- > > Best regards, > > Timenut mailto:time...@metachaos.net > > > > _______________________________________________ > > 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. > _______________________________________________ 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.