| 摘要 |
<p>A device to assist in setting up the pitch, roll, yaw and standoff of a read head (12) relative to a scale (10), so as to improve the quadrature relationship of its outputs (14, 16). Two superimposed Lissajous figures (30, 32) are produced on an oscilloscope screen (20). One of these figures is a rotation or reflection of the other. The read head is adjusted until the Lissajous figures coincide. Simpler, less accurate arrangements are also described, in which a variable DC output signal is produced which represents the radius of a hypothetical Lissajous derivable from the signals (14, 16). The read head is then adjusted to give a constant DC output, representing a constant Lissajous radius.</p> |
