I have to measure strain (quarter bridge three wire), using 350ohm and 1K.
Problem is signal change is so small . I have attached the circuit.
I am using internal IDAC of ADS1248.
1. For 1K strain , voltage range = -24.39mV to 25.641mV. with 0.5uV step (approx)
2. For 350 strain , voltage range = -12.805mV to 13.462mV. with 0.13125uV step (approx)
Now either:
1. I will use external higher current source for high voltage change.
2. Or I will external amplifier. I am searching for such amplifier. I think THS4524 will do the job.
3. Any other suggestions on how I can measure such small changes using ADS1248.
4. My application is battery operated.