I am using AD7124-8 for data acquisition. There are 7 channels to be connected to K-type Thermocouple. All channels are using setup 0 with gain of 16. We have used Isolator between MCU and AD7124-8.
1. When I feed 1mV (25 deg C as per K-Type chart) on a channel, I am getting 1.1mv ((29 degree C) as per the Received Hex code calculation. When I feed Higher voltage, for example 20 mV(485 degree C), I am getting 21.5 mv (520 degree C).But, My application requirement is 1 deg C tolerance with respect to what I feed at input. Problem is that Unwanted voltage is adding to input.
How to overcome this?
2. Right now, I am not using Calibration features in My program.
Can I enable calibration for all channels?
Calibration is one time run Or It has to be run always?
Please guide me to use calibration feature in Our program....