I have a very strange problem with a K-type Thermocouple.
The thermocouple is connected to a "Comark Microprocessor thermometer" which outputs a 1V range analogue signal to an ADC-16.
The problem is that when the temperature reaches and passes a multiple of 100C it drops the hundred value. i.e. 20C = 20C, 60C = 60C, 120C = 20C, 240C = 40C. The value is reported like this on both the screen and in the data file.
The value range is set -270C to 1370C, and the field is set to 9 digits with 3 decimal places.
Has anybody got any idea as to what is happening ?
And especially how to correct it ?