Hi Indeed, the unit seems to work fine without batteries.
------- If filtering and short duration spikes are the concern, one could replace the batteries with super capacitors. One would *hope* they are a bit less likely to create problems. …… ----- While it is a good idea to keep OCXO’s on power, a half hour or couple hour outage is not that big a deal. They will settle back down pretty fast after that sort of interruption. Unless the rest of the lab is on backup power, there may not be a major need for the 105 to stay up and running …. Bob > On Oct 11, 2019, at 11:59 AM, Jeremy Nichols <[email protected]> wrote: > > The 105A was built without a battery. The 105B has a battery and charger. > > I have a 105B that had the failed battery removed before I bought it. It > works fine. I have it on a UPS; it survived our just-finished NorCal power > shutdown just fine. > > Jeremy > > > On Fri, Oct 11, 2019 at 7:01 AM Scott McGrath <[email protected]> wrote: > >> As one who owns a 105 i had the battery properly rebuilt and basically >> have it on low rate charge and periodically discharge the battery >> >> When rebuilding a 105 battery it’s important to replicate its >> characteristics >> >> Remember HP also intended I believe that the battery would also serve as a >> filter for the power supply. As I dont recall any version of the 105 >> without a battery. >> >> >> >> On Oct 10, 2019, at 4:50 PM, Taka Kamiya via time-nuts < >> [email protected]> wrote: >> >> The fact that 25V supply is dropping to 23.4V shows it is drawing far more >> current than it is rated. I am assuming this is a regulated power supply. >> Does the power brick actually shuts down at 500mA or does it let the the >> voltage drop and try to supply what it can? Maybe one or more Nicad has an >> internal short? That will cause and over-voltage situation per battery and >> thus over-current. I've recently seen a brick power supply go into >> oscillation and produce 3x rated voltage when too much current was drawn. >> (and blew the circuit) >> >> Also, different batteries has different charging rates. As far as 105B >> document goes, it says 24V 0.5Amp supply but that is for default >> configuration. Designed charge rate is 390mA (page 3-4) and is current >> controlled by A5Q3. >> >> I would actually measure how much current is drawn there. Since the fuse >> is already blown, just put an am-meter across the fuse and see.... >> >> --------------------------------------- >> (Mr.) Taka Kamiya >> KB4EMF / ex JF2DKG >> >> >> On Thursday, October 10, 2019, 4:00:41 PM EDT, Roy Thistle < >> [email protected]> wrote: >> >> Hi All: >> A 105B (quartz oscillator) is blowing the 1A fuse, after it is on about 1 >> hour. >> The fuse appears to have just melted (not a black mark as the result of a >> flash, in the case of a high current short.)… just looks like the fuse wire >> (inside the glass capsule) melted into some little blobs, for about 1/4 >> the fuse length, near the middle. It wasn't a fast-blo or slow-blo fuse... >> just the normal kind. >> I think the unit is drawing just a little too much current, as the result >> of the batteries needing charging (I had the fast charge option on when the >> fuse blew.) And so, the fuse heated up, and finally melted. Not sure why >> the batteries were not charging normally... but 20.1 volts is what I >> measured across the pack, initially, and 23.4 V after about 45 min of >> charging. >> I am charging the batters, from a power cube, at 510 ma, and dropping >> (cube gives 25V, 500mA max)… the batteries are 20 C size NiCads, wired in >> series... that of course is a retrofit. >> I don't want to put another fuse in, and blow that too, without some >> reasonable explanation of why the first one failed! >> Please, any comments, or hints/suggestions... much appreciated. >> _______________________________________________ >> 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. >> > -- > Jeremy Nichols > Sent from my iPad 6. > _______________________________________________ > 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.
