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SDSS 2.5-meter Telescope
Axis Encoder Scale Factors
Revised 24-May-00
These are the scale factors for the drive encoders used on the azimuth, altitude, and rotator axes.
| Encoder | Scale Factor (asec/ct) | Encoder Model |
Encoder Type |
Interpolator Type |
Interpolator Gain |
| Azimuth Encoder #1 |
0.0140167104063 | Heidenhain ROD800 | Rotary | Heidenhain EXE660 | tbd |
| Altitude Encoder #1 |
0.0140091448584 | Heidenhain ROD800 | Rotary | Heidenhain EXE660 | tbd |
| Rotator Read-head #2 |
0.0213157852666 | Heidenhain LIDA 18C |
Optical Tape | Heidenhain IBV660 | 200 |