Other Parts Discussed in Thread: REF3112, REF3312
Hi Team,
We are using INA128, Instrumentation Amplifier in our design to measure the voltage across a Wheatstone Bridge - Load Cell.
The load cell output terminals are connected at VIN+ and VIN- terminals of the Instrumentation Amplifier INA128.
We have used 2.5V and a resistor divider with two 12K_0.1% resistors as shown in the attachment, to apply a reference voltage of 1.25V
But when measuring, we see that 1.43V is present at VREF terminal.
Also, this reference voltage is changing whenever the load voltage across the Load cell changes.
Could you kindly help in understanding the variation in reference voltage and if it doesn't remain constant?
We are using the below relationship where we assume Vref = 1.25V.
Vout (V) = ((VIN+) - (VIN-)) * Gain + Vref
Thanks,
Denny