RE: [APML] 201XT- too hot outside?

["Richmann, Michael" <richmann@cmt.anl.gov>]

> -----Original Message-----
> From: Alan Voetsch [mailto:avoetsch@mail.com]
> Sent: Monday, June 26, 2000 3:18 AM
> To: MAPUG
> Cc: astro-photo@seds.org
> Subject: [APML] 201XT- too hot outside?
> 
> 
> Hello all,
> 
> I had a heckuva time getting my 201 to guide tonight. When 
> cycling through
> the brightness & location displays, it would read: '25 at 55' 
> for a couple
> of cycles. Then I got this reading:'05 at 33' for a couple of cycles.
> 
> The first time this happened there were other stars nearby, 
> so I understand
> what may have been going on. The second time, no other stars 
> were nearby.
> 
> It's been quite warm lately. It was probably still at least 
> 70 degrees out
> after midnight.
> 
> My question: can the warm weather cause the 201 to SPAZ out? 
> Just wondering,
> I haven't had this problem before. Proper dark frames were taken where
> needed.

I don't see why it couldn't.  The 201XT is not thermostatically cooled nor
cooled at all for that matter.  Noise rises almost exponentially as
temperature increases, especially at temperatures above about -10-20 deg. C,
using the specs for a SITe chip as an example.


Mike
http://www.concentric.net/~richmann/ 

--  APML Archives at <http://www.system.missouri.edu/apml/>  ---
                Unsubscribe at <majordomo@seds.org>