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LDSS3 calibrations

Here we provide some reference numbers for calibrations with LDSS3-C (updated July 2018)

Spectroscopy 

Below we provide some reference numbers for exposure time and suggested quartz lamps in order to obtain a flux level between 30000 and 35000 ADU, on amplifier1 (C1) , with various longslit widths for the standard setup of: speed:fast / gain:low / binning:1x1

Grism(lamp) / Slits  0.75 - center 1.0 - center 1.25 - center 1.5 - center
 VPH - All (Qh)    11 sec    9 sec     6 sec     6 sec
 VPH - Red (Qh)   10 sec    8 sec     6 sec     6 sec
 VPH - Blue (Qh)   85 sec   70 sec   50 sec   50 sec

  

Imaging 

In the table below we provide some reference numbers of imaging flat counts obtained in the g'r'i'z' filters and suggested lamp intensities:

Filter Counts (Fast bin1x1) Exposure time (sec)  Voltage (V)
  B         22000           10      3.5 + Ql
  g'         28000           15      2.5
  r'         26000           10      1.7
  i'         24000           12      1.2
  z'         27000           10      1.0
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