STXL Cooler Limits

Discussion in 'STX and STXL Series Cameras' started by Tom Richards, Aug 29, 2017.

  1. Tom Richards

    Tom Richards Cyanogen Customer

    Dec 26, 2014
    I have a related issue. I have a brand new STXL-6303e and am unable to cool it below -35C (delta around 40C). Even if I work my way down to -35, then continue in small steps, it stays at -35 at 40-50% power. I'm using the SBIG cabling and a 15 amp extension lead. No water-cooling.
  2. Colin Haig

    Colin Haig Staff Member

    Oct 27, 2014
    You might want to start a separate thread. Also, that camera's cooling delta is 60C, so if it's cooling to -35C, and ambient is 25C, it's on spec. You didnt mention ambient temperature, and didnt mention if you are using the supplied power supply.
    chris B likes this.
  3. Doug

    Doug Staff Member

    Sep 25, 2014
    I just split this from the other thread, because it is not related.

    The STXL cameras limit the cooler to -35C maximum absolute temperature, for a variety of reasons. If you too much lower than this you may start to get frost despite the desiccant working perfectly.

    At -35C the dark current of a 6303 is below 0.01 e-/pixel/second. At that rate a 10 minute exposure will accumulate about 5 electrons dark current, and the noise component of that will be less than 3. That's still way below the read noise.

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