LAMOST Signal/Noise Calculator
 
choose the kind of instrument:  
instrument:
Fiber offset:
the frequency of exposure:
choose the source :  
source kind:
effective radius:
choose the wavelength  
wavelength:
choose the time  
Time:
minutes
choose the seeing of site  
FWHM:
The position of object  
declination:
FOV:
the direction in view: