Hi I don’t have a Datum, my Cs standards are both HP’s. On the HP’s there is a front panel meter that will let you know what’s going on. I believe the Datum’s have a serial port and some sort of commands to get them to spit out what’s going on.
Bob > On Jul 1, 2019, at 10:41 AM, Taka Kamiya via time-nuts > <[email protected]> wrote: > > I bought it from a local seller for $600. He was selling "untested". I went > there personally to make sure it locks. I still don't know how much is left > though. As Tom said, I'll just enjoy it while it works. There is no way > I'll buy this kind of thing with that kind of price from eBay. Too scary and > the loss is too high. (and remedy is often impossible) > > There is no provision to measure beam current. I also have no knowledge of > what it should be. Can you possibly instruct me? > > --------------------------------------- > (Mr.) Taka Kamiya > I'm stuck in a wormhole.... Hello, worms! > > On Monday, July 1, 2019, 9:35:49 AM EDT, Bob kb8tq <[email protected]> wrote: > > Hi > > There are a lot of posts back in the archives about various things on Cs > standards. > > Beam current is probably the best way to see “how much is left”. On a high > performance > tube, it drops pretty fast at end of life. That makes is a bit of an iffy > measure there. If the unit has been > in storage for a while, it may take a week to pump down to even get working > ….. (and see the beam > current). > > Most Cs standards you see for sale on eBay are listed as “parts only”. They > may work, they may not work. > The price is likely to be in the $1,000 to $3,000 range delivered. As soon as > one gets listed as “working” the > price goes through the roof ( like 5x to 10X). Since there is no test for > “how much is left”, I’m not sure that is > a good price to pay. > > So your choice is to pay a silly price on one that may last a couple months ( > or may go on for years) or > to pay a low price for who knows what. On the one with the silly price, you > might be able to get some info. > On the reasonable price units, the seller is probably not going to do much. > > From time to time, they show up here on the list. In that case the seller > likely knows a bit more about > the unit than the typical eBay listing. Even so, there are no guarantees. A > unit that was working very > well on the seller’s bench may run out of steam a few months later. > > Bob > >> On Jun 30, 2019, at 6:20 PM, Glen English VK1XX >> <[email protected]> wrote: >> >> Bob, are there any URLs you can point to, or provide advice on, if >> inspecting a Cesium for sale, is there an hour counter, or other metrics >> that can be measured in the tube department ? (I am familiar with TWTs, >> Klystrons etc so the HV doesnt bother me) in order to ascertain the level >> of life left ? >> >> that is, apart from turning it on and waiting a while and measuring ADEV for >> a week.... on the sellers premises. >> >> glen >> >> >> On 1/07/2019 7:09 AM, Bob kb8tq wrote: >>> Hi >>> >>> Based on several replacements on a “high performance” 5071 …. 6 to 7 years >>> of 24/7/365 seems to >>> be about the point things start to get flakey. Maybe not dead, but crazy >>> enough that it lets you know >>> it needs a new tube ( = ADEV is not even close to what it should be ..). >>> >>> Cost several years back for the swap out was right at $40K. The process >>> included hazmat shipping >>> silly nonsense. That part delayed the process by almost 2 months. >>> >>> Bob >>> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
