I'm building an ultra-precision high resistance bridge(now: panel finished)

[zlymex]

Thanks very much everybody for the compliments. I've updated the main posts for the completely new schematics(and the theory of operations). I also included a mini survey of existing high precision high resistance measurement method in the second post.

[zlymex]

You might want to check out the ADA4530-1...  WAY better specs than anything else available, and made for your application...  (Bonus: built-in guard buffer too!)

-Ken

After more than one month's waiting, the mail arrived today.

Another separate mail of NP0/C0G capacitors also arrived, some will be used for the switchable feedback capacitors for the amplifier.

[HighVoltage]

Very nice project.
How did you bring the text on to the surface?

[zlymex]

Very nice project.
How did you bring the text on to the surface?

Thanks. I color printed everything on a self-adhesive A4 paper with background scanned from the aluminium cover. Then I covered it with a water proof, transparent sticker. Lastly, remove the back paper and align it very carefully with the cover(already with all the holes) and tick to it.