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Page Title:
Ballistic Pressure Transducersensitivity Determination and Linearity Check |
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|  MIL-C-14858A (AR)
AMENDMENT 3
APPENDIX A
ANNEX 1
BALLISTIC PRESSURE TRANSDUCERSENSITIVITY DETERMINATION
AND LINEARITY CHECK
A.1 SCOPE
A.1.1 Scope. This procedure is for determining transducer sensitivity and linearity. The
determination of a transducer's sensitivity is required to establish the ratio of pressure input to
electrical output. Once determined, the sensitivity value is used to translate the electrical output
of the transducer into a measurement of pressure. The linearity check is required to ensure that
the transducer's sensitivity value is maintained throughout the full range of pressures to be
measured.
A.2 APPLICABLE DOCUMENTS (This section does not apply)
A.3 EQUIPMENT
A.3.1 Equipment listed in the BALLISTIC TRANSDUCER SENSITIVITY section of
the appropriate Inspection Equipment List shall be used.
A.4 PROCEDURE FOR DETERMINING TRANSDUCER SENSITIVITY AND
LINEARITY
A.4.1 The hydraulic pressure source and electronic instrumentation shall be calibrated
with standards traceable to the National Bureau of Standards or equivalent.
A.4.2 The transducer shall be installed into a hydraulic pressure manifold according to
the installation procedure specified in Annex 2. Adjust the electronic instrumentation such that
when the system is in the "ground state", zero volts (+ 0.001 volts) is indicated by the electronic
recording device. Similarity properly adjust the electronic instrumentation for direct reading;
when a full scale voltage (i.e. 5+0.001 volts) is applied to the input, in place of the transducer,
the electronic recording device shall indicate the same full scale voltage. Connect the signal
cable from the transducer to the electronic instrumentation.
A.4.3 Apply 0 psi (atmospheric pressure) of hydraulic pressure to the transducer, the
indicated reading from the electronic recorder shall be 0.000 + 0.001 volts and shall remain such
for at least 15 seconds.
A.4.4 Apply the following hydraulic pressure levels to the transducer:
a. 40,000 psi
b. 50,000 psi
c. 60,000 psi
11 (27)
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