HDS instrument parameters
| Detectors | 2 2K x 4K CCDs (EEV CCD42-80) |
| Pixel size | 13.5 um |
| Pixel scale | 0.138 ''/pixel |
| Gain | 1.7 e-/ADU |
| Dark current | 10 e-/hr |
| Read noise | 9 e- rms (with Messia4, - Mar/2004) 4.4 e- rms (with Messia5, Mar/2004 -) |
| Saturation level | 50 000 e- (with Messia4, - Mar/2004) 80 000 e- (with Messia5, Mar/2004 -) |
| Linearity | See here. |
| Total Dead Time for Readout (Binning mode [spatial x dispersion]) |
86s (1 x 1) 60s (2 x 1) 44s (2 x 2) 36s (2 x 4) 33s (4 x 4) |
| Min. exposure time | 1 s |
| Slit-resolution product | 36 000 arcseconds |
| Slit width | 0.2 - 4'' |
| Slit length | 2 - 60'' |