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For a detailed Finder Chart and rotation setting see Kyle Kaplan's software. For rough rotations use the lookup table below.

363 133 = Default Encoder Setting at 90 deg. PA (slit east to west)  (NOTE: Default encoder setting was 393, but changed to 363 after installation of rotator)

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) =  363 133 - 90 + (Position Angle) = 273 + (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:

363
Positon AngleEncoder Setting
285198
300213
315228
330243
345258
360, 0273
15288
30303
45318
60333
75348
90 (default)0,18043
15,195

58

30,21073
45,22588
60,240103
75,255118
90,270 (default)133 (default)
105,285378148
120,300393163

135,315

408178
150,330423193
165,345438208
180453
195468
210483
225498
240513
255528

270

543,360223