Regarding temperature chambers and how to use them...
For years it has been my understanding that you should do the "hot" part of temperature tests first, so that the chamber air will "dry out". Then, when you do the "cold" tests, there will be no condensation in the chamber.
OK, so here is how I do it... -- put the UUT in the chamber with the door open -- close the door and raise the temperature -- let it stay hot for something like an hour -- reduce the temperature as cold as you like
Now the question: where did the moisture go?
When you start, the chamber is full of room-ambient air, complete with moisture. As it gets hot and cold, the air leaks out or back in, but it is still the air from the room, with the same relative humidity. Why did the air get more dry?
My reason for asking is so I can reduce the "one hour hot time" and reduce the time it takes for the test sequence.
Any comments will be appreciated.
Kevin