On Tue, Feb 1, 2022 at 6:25 PM Julien Goodwin <[email protected]> wrote:
> "Terminal pin 7 provides an indication of proper operation of the > rubidium lamp. For nominal operation the signal is 6 to 12V. An > inoperative lamp is indicated by an signal of approximately 3V. The > internal resistance of this circuit is approximately 6K." > > ... indeed I'm seeing 3v on that pin. > > Start by checking if the lamp is actually striking - if not, check the 20V supply on the lamp drive board and the drive transistor (2N3553, IIRC) - also check that the lamp assembly is heating up. If the temperature seems correct and the lamp is lit then another thing to try is inspecting the lamp to see if the Rb has managed to migrate to places where it obstructs the light coming out of the lamp - if so, careful heating with a heat gun can rectify this. You want all the Rb in the bottom of the lamp. It's been years since I worked on these things, but they were generally pretty easy to fix - the schematics are available and uses all standard components. Regards, Pete _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
