Rotation PA -> Encoder Table for IGRINS
For a detailed Finder Chart and rotation setting see Kyle Kaplan's software. For rough rotations use the lookup table below.
193 = Default Encoder Setting at 90 deg. PA (slit east to west)
Position Angle (Start north and go east, N=0, E=90, S=180, W=270 degrees, Default = 90 deg slit oriented east-west)
(Encoder Setting) = 193 - 90 + (Position Angle) = 103 + (Position Angle)
WARNING: We recommend you do not rotate the instrument more than +/- 90 degrees from the nominal 90 degree position to avoid entangling wires and hoses.
The encoder setting limits are:
Positon Angle | Encoder Setting |
|---|---|
0,180 | 103 |
15,195 | 118 |
30,210 | 133 |
45,225 | 148 |
60,240 | 163 |
75,255 | 178 |
90,270 (default) | 193 (default) |
105,285 | 208 |
120,300 | 223 |
135,315 | 238 |
150,330 | 253 |
165,345 | 268 |
180,360 | 283 |