Drawing Number: 21086
Revision: NR
OPERATION MANUAL FOR
CONFORMAL BALLISTICS PRESSURE SENSOR
Series 117B
3
5.1
LOW-END NONLINEARITY
It will be noticed during calibration, especially with
metallic cartridges, that a certain amount of pressure
is necessary before linear output is attained from the
conformal sensor.
This is due to the fact that since the cartridge cases
are made nominally smaller in diameter than the
chamber to allow easy insertion and extraction, the
case must be expanded slightly by the internal
pressure before force can be transmitted to the sensor.
See the enclosed guide
“
An Improved Technique for
Utilization of Conformal Ballistics Sensor Calibration
Data
”
for methods of dealing with this topic.
6.0
MAINTENANCE
It is essential for normal operation of the Model 117B
that the insulation resistance be maintained above
10
12
ohms. If insulation resistance should deteriorate,
wipe connector with clean cloth or paper wipe dipped
in a solvent compatible with Teflon
such as
isopropyl alcohol, then bake in oven at 250
F for ½
hour.
