I have a query about how to set a user curve in input A of lakeshore 325 temperature controller. I have calibrated a cernox sensor and entered the curve in the setup by curvehandler software. Now I want to put the curve in input A. I dont know the procedure. Can you help me? I have tried by pressing "input setup". But it is asking for what type of sensor-- Like NTC-RTD, Pt-100, Silicon diodes, etc. None of the above mentioned sensors have got my user curve 35 under their option. What will I do?
Post by Lake Shore Jeff M on Nov 27, 2017 8:17:38 GMT -5
In the Model 325, the correct sensor type selection for a Cernox Sensor is NTC-RTD. Since you cannot see your curve when you use that selection, I expect that you did not create the curve in the correct format. Curves for NTC-RTD sensors must be in the Log Ohms versus Temperature in Kelvin format. If you entered the curve in resistance versus temperature format, the instrument will not allow you to select the curve. To resolve the issue, make sure to select the Log Ohms versus Temperature format in Curve Handler and then convert your resistance values to Log Ohms Base 10. Once you have the conversion, enter the curve points starting at the highest temperature to the lowest.