I have problems reading output from AD594 via my cobra ADCs.
I have not been able to find a similar topic on the forum - or at least one that I understood
I’m novice to electronics, but an experienced programmer.
Its an type J thermocouple chip that translates readings into 10mV/Celsius
I use the ground/5v out on the cobra.
When i read from an Analog In (say ad3, I have tried others) the results fluctuate a lot.
If I use my volt-meter (across ground Vout (leg 7 & 8)) i get a very stable reading of about 0.204v +/- 0.001v. This corresponds to a temperature of 20.4C, which is very reasonable for my basement temp.
When using analog in pin 3, with a scale of 1…3300, i get readings between .27v and 0v. The result changes every time i read, i doesnt seem to depend the frequency with which i read.
I hope someone can explain this, and advice what to do,