Electronics > Projects, Designs, and Technical Stuff
whats in a keysight ultra low noise DC supply filter?
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coppercone2:
if its a capacitor in a box with some resistance, does anyone think the price is a bit steep?
David Hess:

--- Quote from: coppercone2 on December 31, 2018, 01:04:38 pm ---if its a capacitor in a box with some resistance, does anyone think the price is a bit steep?
--- End quote ---

I think it is an LCR circuit with a rather expensive inductor and capacitor but part of the price includes designing the meter to work with it.
coppercone2:
the circuit diagrams just show a capacitor (well not really diagrams but menu options or whatever the pictures are for, i listed the page they are found on somewhere in my post. Would they just hide a inductor?)

what are they designing in if it uses the sense terminals? what kind of capacitor do you think it is? Military wet tantalum? giant foil beast?
David Hess:

--- Quote from: coppercone2 on December 31, 2018, 02:02:31 pm ---the circuit diagrams just show a capacitor (well not really diagrams but menu options or whatever the pictures are for, i listed the page they are found on somewhere in my post. Would they just hide a inductor?)
--- End quote ---

As far as the load is concerned, it is a capacitor.


--- Quote ---what are they designing in if it uses the sense terminals? what kind of capacitor do you think it is? Military wet tantalum? giant foil beast?
--- End quote ---

I assume the external filter modules use the sense terminals to remove the series resistance of the inductor if needed.

The capacitor has to be bipolar.  I assume the lower frequency filter uses a pair of big hermetic solid or wet tantalum capacitors and the higher voltage filter uses a big film capacitor.
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