Kaman Extreme Environment Sensors - Manual (Page 18)

High Temperature Displacement System
Troubleshooting
Troubleshooting the system is limited primarily to isolating the malfunction between
the various components.
The sensor can be checked for coil integrity as follows.
A. Disconnect the solid sheathed cable from the flexible cable.
B.
Using and ohm-meter that has a battery voltage of 1.5 volts or less
check continuity form each individual pin of the connector to the
sheath. These values should be approximately 4.5 ohms at room
temperature.
Anomalous readings could indicate failure at the cable connector, the cable, or within
the sensor. Time-Domain-Reflectometer techniques can be used to isolate the failure
region. Generally only the connector is readily repairable.
The flexible cable can likewise be checked in a similar manner by attaching the
sensor and taking corresponding resistance measurements.
Minor changes in sensitivity are covered in the sections pertaining to installation,
calibration, and adjustment. Some changes may be attributable to changes in
grounding modified mounting or installation, and high resistance contacts. The first
two conditions may require readjustment of the electronics to maintain desired
sensitivity and linearity. The latter will require contact cleaning as described in the
maintenance section.
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