Presently I'm trying to determine if I have bad RTD's or if my cFP-RTD-124 boards are out of calibration. I have a total of 20 SRTD-1 RTD's of various lengths from Omega Engineering. They are connected to 3 prong uncompensated plugs which is plugged into RTD extension wire which runs to the cFP-CB-1. I should mention that I have had these boards for over a year so technically they are out of calibration but this is the first time they've even been taken out of the box. When I measure the resistance at the plugs and the screw terminals of the NI connector board I typically get 111-113 Ohms which according to my RTD conversion chart is around 85-100 degrees F for a room right around 73 degrees. Reading the values in MAX I get temperatures from 76-79 degees F. Can this type of variance be expected when connecting 3 wire RTD to a 4 wire board or is something else at play?