GAIN & OFFSET Double Check Me Please

[Mav359]

Hi Guys

I need someone to double check me....

The QHY8L instructions state then when setting GAIN you.....

* Close the end of the scope

* Set GAIN to 0

* Set Expose for 0sec

* Expose and you want a RMS/Avarage of between 500-1000. i find this a little vaugue so i went for 750 but by moving the OFFSET to 99 i get nearly my 750

Easy

Then comes the OFFSET

* Use a uniform light source (I'm using an EL Panel)

* increase the exposure (to what, 1sec 3mins ???? it doesnt say) In EZCAP i have moved the exosure to 3600ms (this is as high in MS as you can go)

* Looking this time for an RMS/Avarage value of between 60000-65000 (again i aimed for the half way point of 62500)

Changing the GAIN this time to 2 i have a value just below 63k

So my settings are

Gain   = 2

Offset = 99

FLATS = 1.563secs (The lowest i could expose a flat before my RMS/Avarage dropped was 1.563secs)

Does this sound like i'm doing this right, i'm doubting myself.

Cheers

[sloz1664]

Hi Alan,

Yep it does get confusing, especially with the QHY procedure.

I found the attached gain & offset file a more detailed explanation & sequence.

If you use a LP filter, this must be fitted prior to commencing the procedure.

My settings for my QHY8 Pro are gain 11 offset 121.

cheers

Steve

gain and offset.pdf

[Mav359]

Good man Steve

exactly what i needed. already gone through and i was way out G=10 OFF = 107

Cheers for that