I have strain gauge of 1K, 50000 microstarin , & Gf = 2, so for 1 microstarin change in resistance is 2milliohm.
I am using external reference created by IDAC current on reference pins
1. Currently i am using ADS1248, by directly passing 50uA through strain gauge without any bridge, with PGA = 32
So ideally at 1000ohm i.e 0 strain, voltage is 50000 microvolt
& 1 microstain voltage is 50000.1 microvolt. So change of 100nV.
Will ADS1248 will be able to sense such small changes?
2. If not, is there any ADC which can do this job better
3. Is is correct method to directly send current across strain gauge & measure change in resistance rather than brigde