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LDSS3 – Calibrations
Here we provide some reference numbers for calibrations with LDSS3-C
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 (updated Jan2023):
| Filter | Counts (Fast bin1x1) | Exposure time (sec) | Voltage (V) |
|---|---|---|---|
| B | 22000 | 10 | 3.5 + Ql |
| g' | 31000 | 15 | 2.5 |
| r' | 34000 | 10 | 1.7 |
| i' | 32000 | 10 | 1.2 |
| z' | 33000 | 9 | 1.0 |