Generally with a current limiting input resistor and clamping to the power rails (this can be done with diodes, but BJTs and JFETs are also often "abused" for this because they can have lower leakage, also a JFET mux does it for free).
Any specific examples of both parts and exact use of said parts to achieve this?
Look at the service manuals of older bench DMMs, e.g. HP 3456A, Fluke 8840A, Keithley 19x. I attached one example from the 3456A. Just four 27k resistors and two JFET diodes for clamping. These JFET are ultra low leakage, like 2N4117A.
Edit: The relay is just for range switching.
Lol, why didn't I notice this before? Oh wait, you edited. Or I am just blind. No matter... I got the 2N4117A from this
Texas Instruments Burr-Brown appnote:
http://www.ti.com/lit/an/sboa058/sboa058.pdfBut now I've got double confirmation, which is always good.
At any rate, given the cost I think I will stick with the BAS116 for now and when the rest is proven use the 2N4117A in the next iteration.
Edit: checked an open tab ... yup, I am blind. You already posted that 2N4117A when I replied to jucole. Need glasses.
Maybe you know any good price/performance MOVs as well? Or do I first have to search for those myself, and then 10 seconds before I find them you post the very part numbers I find, 100% as per Murphy's Law or some derivative?
Tradition dictates that you don't know any good price/performance MOVs so I will have to look for them myself.
This would be the first project I design MOVs into, so noooo idea as of yet how to find the "good ones".