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LDSS3 calibrations

Here we provide some reference numbers for calibrations with LDSS3-C (updated August 2017)

Spectroscopy

Below we provide some reference numbers for exposure time and suggested quartz lamps in order to obtain a flux level of ~30000 ADU, on amplifier1 (C1) , with various longslit widths for a 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)    12 sec    10 sec     7 sec     6 sec
 VPH - Red (Qh)   12 sec     9 sec     6 sec     5 sec
 VPH - Blue (Qh+Ql)   90 sec   70 sec   60 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         25000           10      3.5 + Ql
  g'         25000           20      2.5
  r'         24000           10      1.8
  i'         23000           10      1.3
  z'         23000           12      1.0
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