Wow on the right, is that the lamp? Thats one large lamp to light. I am use to the little capsules about the size of a pr-1 light bulb. This is a keeper picture. Regards Paul WB8TSL
On Tue, Feb 20, 2018 at 8:24 AM, Bob kb8tq <[email protected]> wrote: > Hi > > Indeed very cool pictures. > > If the lamp is like most gas bulb lights, there is indeed a “strike > voltage” required > to get things going (or an RF excitation). There inevitably is some > temperature > dependence as well. A constant current driver might be the better bet. > > Bob > > > On Feb 20, 2018, at 4:30 AM, Poul-Henning Kamp <[email protected]> > wrote: > > > > -------- > > In message <[email protected]>, [email protected] > writes: > > > >> Here is a PIX of the optical unit from a 5065A totally removed from the > >> shield assembly. > > > > Nice! > > > >> Left to right: > >> > >> Lamp assy > >> lamp oven cylinder > >> lamp reflector/convection block/diffuser > >> Rb85 filter cell > > > > It looks like there is a square filter of some kind > > between the reflector and the filter cell ? > > > > I've been thinking a little bit more about power for the lamp assembly. > > > > Since I have the lamp on the bench-supply I am going to plot lamp > > voltage vs. photo-I because it looks like a threshold rather than > > a linear relationship. > > > > If that is the case, I think it will make sense to give the lamp > > its own adjustable voltage regulator (LM317), so the power can be > > reduced to what is optimal/necessary without having to take the > > lamp apart and change a resistor. > > > > A 1R resistor between the 22-30V supply and the LM317 will make it > > easy to monitor lamp current, and a 300mA short-circuit protection > > is a nice bonus. > > > > If need be, the regulator could start out at 20V and drop to something > > lower in a matter of minutes. > > > > Actually, now that I think about it, I should try to measure if it > > is gives better stability if I drive the lamp with constant current, > > constant power, constant voltage or constant photo-I... > > > > -- > > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > > [email protected] | TCP/IP since RFC 956 > > FreeBSD committer | BSD since 4.3-tahoe > > Never attribute to malice what can adequately be explained by > incompetence. > > _______________________________________________ > > 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. > _______________________________________________ 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.
