Hi Greg,
Thanks for that -- I would've guessed that they would shoot for
deltas of 10% or so, and those numbers are within ~2x of that guess,
so 20mV and 0.2pF seem perfectly reasonable. In sampling bridges,
I'd like those to be a little better matched, but I don't know if HP
went to the trouble of tightening the matching criteria for that
case. It certainly would have driven up the cost (although HP was
never too shy of pricing the components appropriately).
Thanks again for the data (and the correction), Greg. I do
appreciate it.
--Cheers
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
On 1/17/2022 17:32, Greg Muir via
groups.io wrote:
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Tom,
?
Thanks for
pointing this out.? I
was on the way out the door when I wrote the post and overlooked
some details.
?
From what I can
gather from the scatty information I have it appears that they
are trying to match the diodes with a maximum delta Vf of
20 mV and a maximum delta Co of 0.2 pF.? It doesn¡¯t appear that
there are actual hard values for both of those parameters but,
instead simply trying to match the two diodes as close as
possible to each other no matter where the values fall.
?
What bothers me a
bit is that the probe schematic shows a quad set of diodes.? A pair would only serve
to replace half of the quad.? HP
did sell a matched quad set of this particular diode under part
number 5082-2370.? Any
thoughts on this one?
?
Greg
