02/25/00
30 - Microsense II Model 5300 Gaging System
Probes
The patented measurement probes that are included with the Model 5130 may be selected from a vast
variety of available models which vary in diameter and operating range.
The probes are transducers which form a capacitor with the target surface. Because the area of the formed
capacitor is constant, variations in capacitance are related to variations in the distance between the probe
and the target surface.
Use care when handling the probes, and especially avoid scratching the sensor.
Nominal, Near and Far Standoffs
Note that the system does not measure the absolute distance between the probe and target surface, but
variations from a nominal position known as the probe's
Nominal Standoff
. This probe-to-target distance,
at the midpoint of the probe's operating range, yields an output of 0 V. As the target moves closer to the
probe, the voltage decreases.
At
Near Standoff
, the smallest probe-to-target distance within the probe's operating range, the output is -
10 V. At
Far Standoff
, the largest probe-to-target distance within the probe's operating range, the output is
+10 V.
Target surface here yields
negative displacement
Target surface here yields
positive displacement
Probe
operating
range
Nominal Standoff
Near Standoff
Far Standoff
Probe Operating Range and Standoffs
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