[time-nuts] HP5065A C-field current voltage mod
Charles Steinmetz
csteinmetz at yandex.com
Fri Sep 4 12:27:15 UTC 2015
Perry wrote:
>OK, but why? The temperature would be stable so the resistorsand
>reference diode wouldn't drift.
There is a LOT more to making a good temperature-controlled
environment than hacking together a DIY oven. That may be fine for
stability of tenths of a percent (10e-3), but when stability of
10e-13 is at issue it doesn't pay to start with 50ppm parts and put
them in a DIY oven. You need to start with low-tempco parts.
>What about newer reference's IC's such as REF 102?
>I don't want to re-invent thewheel, just learn what is better.
You need to spend time researching the tolerance, noise, and tempcos
of two- and three-terminal voltage references. The manufacturers
have on-line selection guides that allow you to sort products by any
parameter you choose. Most distributors do, too. Or, look at a
reference that has done much of it for you -- I suggest the new,
third edition of The Art of Electronics, which has table after table
of the very information you are looking for.
Best regards,
Charles
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