NAOMI Home ·
Engineering Information ·
Telescope Operator ·
Duty Engineer ·
NAOMI Experts ·
Links
Checking WFS Noise
It is
important that, as part of the daily checks, the noise on the NAOMI WFS is
measured and compared to its calibrated value. Follow
the instructions to check the WFS noise on NAOMI, remembering to make sure that
the lights are switched off inside GRACE.
- You
will need to log into NAVIS as user NAOMI and to start the TopGui application.
To stat the application type;
naomi@navis> TopGui &
- From the 'Tools' menu select 'WFS Control'. This will make the
'WFS Display Page' appear on the right-hand side.
-
From
the 'Display Control' section click the 'grab' button. This will grab
a WFS image.
- Now press the 'Save as FITS' button. You should see the filename
of the FITS image appear below these buttons.
I.e.
FITS file : 20030827-144319.fits.
- The fits file will be stored in the '/export/software/Electra-save-dir/Grabs/WFS'
directory on NAVIS.
- The image can be viewed and examined by using ximtool.
- The noise should be around 7.7 ADU (4.3 electrons)
For more information on WFS Readout Noise - See the NAOMI CCD CAMERAS - TEST RESULTS document.
