LDSS3 – Calibrations

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:1×1

Grism(lamp) / Slits 0.75 – center1.0 – center1.25 – center1.5 – 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:

FilterCounts (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
Table of Contents