Dome (screen) Flat Fields : "Flatf. Pos." from the Telescope's GUI + "ffl" software:
CCD frame definition: full_frame_slow_bin2
May 2010
| ffl lamp | exposure time (seconds) | channel 1 (counts) | channel 2 (counts) | channel 3 (counts) | channel 4 (counts) |
|---|---|---|---|---|---|
| 50 W 50 W 50 W 300 W |
0.4 0.8 1.6 0.6 |
UV_B 1200 1900 3000 26500 |
B_B 7000 14000 27000 - |
R_B 25000 51000 - - |
NIR_B 12000 24000 48000 - |
| 50 W 300 W 300 W 300 W 300 W |
1.5 1.0 1.5 5.0 5.5 |
v 900 6100 9000 28000 31500 |
b 1500 19000 27500 - - |
y 2300 30000 45000 - - |
I 31000 - - - - |
| 300 W 300 W 3000 W |
1.0 14 1.3 |
u 2600 30000 3300 |
Hbeta(wide) 23000 - 30000 |
|
|
| 300 W |
5.5 |
|
Hbeta(narrow) 25000 |
|
|
Saturation begins at ~ 65000 counts, which is shown on the View Control of the GUI with red color (using the defaults image cuts).
FLUSH THE CCD's with the large button labeled Flush CCD AFTER TO REACH SATURATION LEVEL.
There is a special UV lamp to take good dome flat field in uv channel (ask the staff). If you are using this device, please, take into account that it is necessary to wait about 2 min to get the lamp warm, and if you turn off, also it is necessary to wait at least 6 min if you want to turn on again.