> If the dissipation is going to be high in the dropper, a constant current
> source feeding the shunt screen regulator from a lower voltage can have
> the same effect. The current can be set to the maximum allowable screen
> current, and the shunt regulator absorbs any excess. Just a variant on
> Tom's method.
That method also lends itself to being easily converted into a
switch to remove screen voltage during faults or during standby.
> >Use the bias and blower voltage (with an air pressure switch) to turn on
> >the HV system.
>
> Question: is pressure the best thing to monitor, or is air flow as
good?
The easiest thing to measure is pressure gradient across the
anode cooling area. That can be as simple as a below
chassis/above chassis pressure differential switch. If you lose that
pressure drop, you know you have a problem with inlet pressure or
outlet pressure.
73, Tom W8JI
w8ji@contesting.com
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