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Post by ranjini on Jan 2, 2019 23:04:52 GMT -5
A very happy new year to you.
I just wanted to share my experience of calibration of Cernox sensors. We did calibration using a cryo cooler set up. upto 30 K-3K, we used heater to get the points and above 30K points were taken from the cooling curve or warm up curve. after calibration, both sensors are kept same and ones again switched on the cryo cooler, now both calibrated and uncalibrated sensors are not showing same temperature. Each time it varies. at higher temperature difference is nearly 1 K and lower temperatures its near 0.1 to 0.3
why does it behave like this. i took out the difference and tried to match the curve,. Now at Higher temperatures its matching. But at 4- 3 K, difference is 0.2 -0.3 K.
Can u pls guide what is the proper procedure of calibration and how to check it.
regards
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Post by ranjini on May 18, 2017 7:07:31 GMT -5
Thank you so much for ur reply. Right now, its not permanent. we are just testing the cryo cooler. in future we may have to go for permanent mounting. I will try the varnish option, now. Thank you
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Post by ranjini on May 17, 2017 9:48:35 GMT -5
How to make sure that SD package is mounted well without the CO clamp. I was using a spring contact made up of BeC and found somehow the contact is not perfect. while using Indium, it has to heat the whole mass of the substrate where we want to mount the sensors to 180 degree which looks diffciult. which method is more reliable. and for connecting wires to sensor leads, ostalloy does not give good joint strength. so how can one solder the wire to sensor lead using a solder within 200 degree Celcius.
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