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What is "linearity" of a power supply?

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cupoftea

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Hi,
I was told that there is an x-ray tube's filament supply with "improved linearity".
What does this mean?
I thought a filament supply just had to put constant current through the filament?
 

I can just guess that linearity requirements are related to usage of filament current for anode current control.

But it sounds like marketing babble. Presume there's a more technical description.
 
Good discussion over here :


Seems like if tube operated in space charge mode that current not critical as
long as filament meets emission T. But I will let the experts comment further.
The only thing I know about xray tubes is they have been used on me occasionally :).


Regards, Dana.
 
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