BAD Offset Null

[stefo83]

Hi, all. I measure strain with half-bridge strain gages. I use offset null, but if i change rate samples everytime i get different values from zero. I now that is a ghosting, but is there a method or calculations to now what is exactly rate for me to get zero values on non loaded strain gages?

P.S. I get approximately zero on rate = 15000 s/s

[Hooovahh · Accepted solution]

http://digital.ni.com/public.nsf/allkb/73CB0FB296814E2286256FFD00028DDF

I'm guessing you already read that, so the real answer to how fast can you sample, will depend on the impedance on the system, and how fast a high impedance load switching between channels can stabilize.