Chuck Harris wrote: > This is a chicken vs egg sort of problem. When I took apart the oven > on my 5065A rubidium, it looked to me as though the enamel insulated > nichrome wire developed a short about 50% into the coil, and wiped out > the transistor. It also heated the rubidium lamp hot enough to reflow > the solder on its circuit board and thoroughly char the PCB's epoxy. > > I am not sure how the quartz ovens are wound (I suspect they are the > same), but with the rubidium ovens, the nichrome wire is wound as a > bifilar loop. This is done for two reasons, 1) to cancel the magnetic > fields, and 2) to make the start and finish wires of the winding happen > at the end of the oven where the terminals are. > > -Chuck Harris > > An Ayrton-Perry style winding will also have low magnetic field.
Bruce _______________________________________________ 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.
