TEC Cooling Meade DSI Cameras

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TEC Cooling Meade DSI Cameras

Postby psychobilly » Wed Jul 02, 2008 7:53 pm

I picked up a TEC Cooling kit from the Meade DSI Cameras from a guy in the US on EBay for £30 delivered ..

It took me about an hour to dis-assemble the camera , machine the case and then rebuild with the TEC, Fan and Heat spreader in place...

Here are the first "darks"

Firstly a 2 min exposure at room temp with the CCD at 31.5C as reported by the DSI II

[image]http://www.btinternet.com/~psmithuk/stuff/2minnotec31_5C.jpg[/image]

And then another 2 min "dark" after the TEC had dropped the CCD temp to 19.5C in about 2 mins...


[image]http://www.btinternet.com/~psmithuk/stuff/2mintec19_5C.jpg[/image]


Quite happy not perfect but the CCD is still at 19.5 so should be better outdoors when its colder...

And here's a 5min "dark" exposure with the TEC holding the CCD at 22C

[image]http://www.btinternet.com/~psmithuk/stuff/5mintec22_0C.jpg[/image]

Billy...
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RE: TEC Cooling Meade DSI Cameras

Postby brianb » Wed Jul 02, 2008 8:26 pm

Very pretty. [;)]

How much "machining" does the case require? Some of us don't have facilities beyond a craft knife and a file!

And (a big one this) how is the sensor kept free of condensation when it's cooled probably well below dewpoint?
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RE: TEC Cooling Meade DSI Cameras

Postby psychobilly » Wed Jul 02, 2008 8:43 pm

[url=http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=110266591024&ssPageName=MERC_VIC_RCRX_Pr4_PcY_BIN_Stores_IT&refitem=110263827306&itemcount=4&refwidgetloc=closed_view_item&usedrule1=CrossSell_LogicX&refwidgettype=cross_promot_widget&_trksid=p284.m183&_trkparms=algo%3DCRX%26its%3DS%252BI%252BSS%26itu%3DISS%252BUCI%252BSI%26otn%3D4]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=110266591024&ssPageName=MERC_VIC_RCRX_Pr4_PcY_BIN_Stores_IT&refitem=110263827306&itemcount=4&refwidgetloc=closed_view_item&usedrule1=CrossSell_LogicX&refwidgettype=cross_promot_widget&_trksid=p284.m183&_trkparms=algo%3DCRX%26its%3DS%252BI%252BSS%26itu%3DISS%252BUCI%252BSI%26otn%3D4[/url]

Hi Brian,

The machining involves...

Reducing the height of the existing cold fingere on the rear case of the DSI by 5.6mm whilst keeping it flat and parallel to the rear of the CCD...

Drilling a small hole for the fan wires to get inside the case as its powered from the computers USB port

Drilling a hole for the DC power connection for the TEC element.

Optionally drilling and tapping four mounting hoels for the fans as opposed to using double sided tape or glue to hold the fan to the heatsink style back of the case...

The kit comes with a thicker closed cell foam pad to seal the CCD and a washer to appply more "pressure" to the filter to seal the front. The instructions give info about removing any water vapour trapped between the CCD and the filter cover and the possibility of usign silicone sealant instead of the gasket that is already inthe camera housing...

Billy...






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