8.1.6 Camera Performance
Table 8-3: FPI+ Camera Modes and Performance
| FPI+ Observing Mode | Horizontal Clock Rate | Bit Depth | Gain [e-/DU] | Minimum Read Noise | FPI+ Tracking Possible |
|---|---|---|---|---|---|
| FAST_STARE | 10 MHz | 14 bit | 10.7 | 45.9 e- rms | No |
| FPI_TRACK_MEDIUM_STARE | 5 MHz | 14 bit | 8.9 | 36.1 e- rms | Yes |
| FPI_TRACK_SLOW_STARE | 1 MHz | 16 bit | 0.7 | 6.0 e- rms | Yes |
Dark Current:
With the camera’s multi-stage thermo-electric cooler, it is possible to achieve sensor temperatures of 100˚ C below ambient temperature. The measured dark current rate at a sensor temperature of -85˚ C, the recommended setting, is 0.001 e-/pixel/second.
Frame Rates:
The frame rates listed in Table 8-4 are for the full frame. When sub-frames are used (without FPI+ tracking) the achievable rates can be increased. The frame rate then depends on the sub-frame size and its position on the sensor.
Table 8-4: FPI+ frame rates in frames per second for the acquisition of full frames in the three observing modes
| Size | FAST_STARE | MEDIUM_STARE | SLOW_STARE |
|---|---|---|---|
| 1x1 | 8.9 | 3.8 | 0.9 |
| 2x2 | 17.5 | 6.9 | 1.7 |
| 4x4 | 33.6 | 11 | 3.2 |
