Kaman KD-5100 - Manual (Page 26)

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14. TERMINOLOGY
NULL GAP
The null gap is the point at which a target is equidistant from each sensor of a differential
pair. The system output at null = 0Vdc. The actual gap is measured from the sensor face
to the corresponding target face and includes a required offset (null gap = offset plus
maximum measuring range).
OFFSET
The offset is the minimum distance between the sensor face and the target. Offset is
necessary to prevent the target from striking the sensor face and to optimize performance
(offset = null gap minus max range).
MEASURING RANGE
The measuring range is the full range of target motion over which the various
specifications such as resolution, linearity, and sensitivity can be met. The differential
sensor arrangement yields a bipolar output and measuring range is expressed as a + and –
value either side of the null position (measuring range = null gap minus the offset).
Figure 15 Null Gap, Offset, Measuring Range
SENSITIVITY
Sensitivity is the output voltage per unit of displacement. Usually expressed as millivolts
per mil (0.001”) or per millimeter.