### Wrist Calibration

In order to calibrate the wrist, you need to measure at least three A angle positions and at least three B angle positions for a total of nine sphere measurements (each A angle position must be measured at every B position). The Wrist Calibration Angle Setup area of the Measure Probe dialog box gives you the ability to specify the angles for calibrating both the A and the B axes . The first three options are for calibrating the A joint.

For information on using the Wrist Calibration Angle Setup area to define the AB angle positions, see the "Wrist Calibration Angle Setup" topic in the "Defining Hardware" chapter.

Note: When using a Renishaw PHS, every time there’s an interruption in electrical power to the PHS controller, you must either perform a wrist calibration or select Home the Unit from the Type of Operation area of the Measure Probe dialog box and click Measure again.

Caution When Using SP600 Probes

For most probe types on an infinite wrist, the wrist device calibrates a zone of angles and approximates the rest. However, if you have an SP600 probe on an infinite wrist, the SP600 probe needs its own deflection matrix. You must, therefore, calibrate each AB tip angle that wasn't part of the original mapping process or suffer inaccurate results in your measurements.

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