Quote:
Originally Posted by ZeroID
I'm working on MkII, Rev 1 now. Ordered another TEC because I've reinstated the AS! 120 setup, 20* plus delta under test.
The revision is an internal wrap around aluminium plate for the TEC to connect to. Goes over the top and down under the camera so a lot of area and I've modified the Mk I external foam insulation to fit over the rear of the plastic enclosure. The front is still internally insulated.
I'll post a few pix up when I put it together after the TEC arrives.
Long term I need a power adapter for the 450D so I don't have to open it up to change batteries. It lasts a full night easily but I could insulate if better if I didn't have to make it accessible. Moisture control will be by silica bags inside the enclosure. If I can get a good 10-15* delta I'll be happy.
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G'day Brent. I've got a 450D power supply coming but no camera to use it on. Want it?
I've just done a full operation test on the #1 unit. The equipment is a 40D so it's a solid piece of camera, The ambient temp for the test was 27.8 C.
I ran the TEC for 30 minutes before I started imaging. I probably should have run it longer because the temp in the box was still dropping but I was impatient to see how much the sensor added to temperatures. SO the chamber temp at the start was 11.56C. The chamber temperature continued to fall for about 30 minutes and reached down to 10.75C while the sensor temperature started to climb immediately and levelled off at about 21C - roughly 10C above the starting point.
So I guess those who warned me that the sensors ran quite hot were right. The end result of all this seems to be that I am operating at about 15C or a bit more below the temperature that the sensor would otherwise have reached.
It also suggests that the chance of condensation are pretty remote. Even when the ambient temp gets down to say 8C which is a normal winter night here, I will still not have the sensor much below about 3C. Hopefully that works out in the real world.
Peter