I have been trying to make temperature data logger using thermocouple.....I have used Type K thermocouple and AD595 for amplification....but the my output is not stable at all....It continuously fluctuates in the range of 20mV (so 2 C) ..... when I examined o/p of ad595 on CRO....it reflected that it is not stable and it fluctuates in a band of 20mV....however when I switch off the power...I can still observe this fluctuating band on ground line (no power so o/p should be zero) it is 16mV band,,,,
Moreover I am transferring data using RF modules , so when I connect this to my circuit this band increases to even 100mV...
I have connected 2nd order low pass filter at o/p of 595...I am attaching o/p screenshot of cro..
how to avoid this fluctuation....or is there a way to average out this output over time....
Moreover I am transferring data using RF modules , so when I connect this to my circuit this band increases to even 100mV...
I have connected 2nd order low pass filter at o/p of 595...I am attaching o/p screenshot of cro..
how to avoid this fluctuation....or is there a way to average out this output over time....