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HW_POLAR

Controls the Half Wave Plate.

Format: HW_POLAR <function> <parameter>

Examples: HW_POLAR MOVE IN
HW_POLAR ROTATE 25
HW_POLAR ANGLE 1800
HW_POLAR STOP ROTATE

Synonyms: HWIN HW_POLAR MOVE IN
HWOUT HW_POLAR MOVE OUT
HWP HW_POLAR ANGLE
HWPROT HW_POLAR ROTATE

Units: Angles are specified in units of a tenth of a degree.
Rotation rates are specified in units of a tenth of a Hz.

Range: Angle in range 0 to 3600.
Rotation rate in range -7 to 118.

Comments: function can have the values ROTATE, ANGLE, MOVE or STOP.
The parameter for HW_POLAR ROTATE is a rotation rate in units of a tenth of a Hz, this sets the plate in continuous rotation.
The parameter for HW_POLAR ANGLE is an angle in units of a tenth of a degree, this sets the plate to a fixed angle.
The parameter for HW_POLAR MOVE can be IN or OUT, this moves the plate in or out.
The parameter for HW_POLAR STOP can be ROTATE or MOVE, this stops the plate rotating or moving.
Notes:- The wave plate must be in before continuous rotation is started; and the if the wave plate is rotating it must be stopped before sending it to a fixed angle.