Should have carefully read Corby's comment. Lamps left. On Tue, Feb 20, 2018 at 9:40 AM, paul swed <[email protected]> wrote:
> 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/m >> ailman/listinfo/time-nuts >> > and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/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.
