| 摘要 |
A probe (8) comprises a housing (10) and a member (20) movable with respect to the housing onto which a stylus (12) may be mounted such that movement of the stylus results in movement of the member and a primary transducer (50,52) for measuring movement of the member relative to the housing. The member may be located in a precisely defined rest position (22,24) with respect to the housing, putting the probe in a mechanical datum position. For a combined transducer probe, this enables the primary transducer (52,54) to be locked whilst enabling use of a secondary transducer (70). The primary transducer outputs can be datumed whilst in this mechanical datum position. Drive (40,50,60) or bias (26) means in one axis secure the member in its rest position in all axes. |
