Noise blob cooler problem ASI294MC Pro

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khrrugh
Posts: 9
Joined: Sun Nov 12, 2017 12:18 pm

Noise blob cooler problem ASI294MC Pro

Post by khrrugh » Thu Jun 27, 2019 6:36 pm

Hi ZWO support,

there is a strange problem with my ASI294MC Pro. Whenever i turn on the cooler, something appears after a few minutes. I call it 'the annoying noise blob'. It took me several months to hunt the problem down, but now it seems to be clear that it is related to the cooler. I set up a test scenario, where i took flats with a Lacerta Flat Field box - some cooled, some uncooled. Here is the result (stretched and background extracted):

Uncooled, everything fine:

Image

Cooled, annoying noise blob made it to the image:

Image

This is how it looks in a sample image (no calibration frames, just stretched and brackground extracted):

Image

Just take a look right of NGC 7023, where the noise blob is clearly visible.

I tried really a lot to get rid off the annoying noise blob, but i have no more idea. The only way is to turn off the cooler, but it is not satisfactory to own a cooled camera where one can not use the cooler :(

Do you have any idea what is going on here?

Thanks in advance,
Michael

PS: To read the full story, go here:
https://www.astrobin.com/412075/D/?nc=user

Katherine.Tsai
Posts: 40
Joined: Fri Dec 07, 2018 10:24 am

Re: Noise blob cooler problem ASI294MC Pro

Post by Katherine.Tsai » Fri Jun 28, 2019 8:15 am

Hi
Here is a quick guide of how to redry the camera.
Hope this could help you.
https://astronomy-imaging-camera.com/ma ... iccant.pdf

khrrugh
Posts: 9
Joined: Sun Nov 12, 2017 12:18 pm

Re: Noise blob cooler problem ASI294MC Pro

Post by khrrugh » Fri Jun 28, 2019 9:18 am

Hi Katherine,

i never opened the chamber, so there should be no need to redry?

Greetings,
Michael

khrrugh
Posts: 9
Joined: Sun Nov 12, 2017 12:18 pm

Re: Noise blob cooler problem ASI294MC Pro

Post by khrrugh » Fri Jun 28, 2019 6:18 pm

Well, i cleaned and redried the chamber. I got rid of some dust, but the problem with the noise blob remains the same. Here are the results:

Cooled, after redry-process and background-extracted:

Image

Any further ideas?

Katherine.Tsai
Posts: 40
Joined: Fri Dec 07, 2018 10:24 am

Re: Noise blob cooler problem ASI294MC Pro

Post by Katherine.Tsai » Tue Jul 02, 2019 11:34 am

Hi
Please send an email to support(at)zwoptical.com

khrrugh
Posts: 9
Joined: Sun Nov 12, 2017 12:18 pm

Re: Noise blob cooler problem ASI294MC Pro

Post by khrrugh » Fri Jul 05, 2019 6:24 pm

Thanks Katherine. I am on vacation at the moment and will send an email when i am back home.

Katherine.Tsai
Posts: 40
Joined: Fri Dec 07, 2018 10:24 am

Re: Noise blob cooler problem ASI294MC Pro

Post by Katherine.Tsai » Wed Jul 17, 2019 7:19 am

khrrugh wrote:
Fri Jul 05, 2019 6:24 pm
Thanks Katherine. I am on vacation at the moment and will send an email when i am back home.
We will wait for your email.

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