lpxy
New Member
Posts: 2
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Post by lpxy on Nov 14, 2018 13:49:19 GMT -5
I'm a graduate student at the University of Washington. Our lab has a Lakeshore 335 temperature to monitor and control the temperature in a Janis SOM2 cryostat. There are two heaters and temperature sensors in the cryostat. One heater and sensor are controlled with the A port of the 335 temperature controller. The other heater and sensor are controlled with the B port. We are able to use the Closed-loop mode in the A port. But if we want to use Closed-loop mode in the B port, we are not able to change the temperature setpoint. The setpoint keeps being at 0K no matter how we change it. Anyone knows what is the problem and how to solve it?
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Post by Lake Shore Jeff M on Nov 14, 2018 15:53:40 GMT -5
As a starting point, please verify that the setpoint limit value in the sensor curve file you have assigned to input B is not zero. To do this, verify what curve you have assigned to Input B and then use the curve entry button to edit the information. Press Curve Entry then select Edit and press enter. Next select the curve you are using and press enter. Press enter until you see the Setpoint Limit Entry and verify the value is equal to or greater than the setpoint you want to enter. Press enter again and then press the escape key to return to the normal display. If this does not resolve your issue, please contact us at service@lakeshore.com or call 614-891-2243 and select option 2 for service between the hours of 8:00 AM to 5:00 PM Eastern time.
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lpxy
New Member
Posts: 2
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Post by lpxy on Nov 15, 2018 14:13:57 GMT -5
Thanks! That solves the problem. The setpoint limit was at 0K before. I changed to 300K and now it works.
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Post by Lake Shore Jeff M on Nov 15, 2018 14:21:41 GMT -5
Thank you for letting me know the issue was resolved
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