Post by jacoballdredge on Mar 2, 2020 10:12:04 GMT -5
Hello, so we have a strange problem where if we are not looking at a channel on the scanner the temperature will rise quite a bit. This is for a lakeshore 372 with the 3726 scanner looking at RuO at around 20 mK.
We can go from a 10kOhm reading to 7-8 just by switching to another channel and switching back.
We suspect a grounding issue/pickup on the lines between the scanner and the fridge, but I was wondering if anyone had seen this before and had a solution or if there was more information about what the scanner is doing to the lines when it is not looking at them.
Post by Lake Shore Ogi on Mar 18, 2020 9:58:57 GMT -5
In the 3726 scanner, the channels that are not being read are shorted to ground. We did that to eliminate noise, and hence heating, into the environment. Your assumption is most likely correct (that it is a noise issue). Now that you now about the unused channels, I hope it will enable you to debug your issue. However, if you end up having more questions, please let us know.