MIL-PRF-49166C(CR)
shall be fully capable of meeting all of the operational and environmental requirements specified
herein. Verification of the supplier meeting the overall performance requirements shall be the
governing acceptance standard.
3.4 Description. The Mechanical Scanner, MX-9872(V)/UA, herein known as the
Scanner, normally consists of a scan mechanism assembly and housing. The scan mechanism
includes a flat scan mirror, interlace gimbal, and associated drive components. The scan mirror
pivots about the scan axis and oscillate about the interlace axis. The Scanner has provisions for
mounting a phase lens and counterweight for system unique requirements.
3.4.1 Construction. The Scanner shall be constructed in accordance with this specification
and, shall assure compliance with the contract configuration baseline and the form, fit and
function interface requirements as specified in the applicable specification sheet. .
3.4.2 Weight. (See applicable specification sheet.)
3.5 Components. The Scanner consists of the following major components:
a. Scan mirror assembly
b. Solenoid (2)
c. Interlace flex pivot assembly (2)
d. Scan transducer assembly
e. Interlace transducer assembly
f. Upper scan flex pivot assembly
g. Lower scan flex pivot assembly
h. Return spring assembly (4)
I. Scanner housing
j. Scanner housing cover
k. Gimbal
l. Wiring harness
m. Gimbal counterweight
3.6 Performance characteristics. (See 3.1)
3.6.1 Scan angle and frequency.
3.6.1.1 Variable scan frequency. Scan frequency of the scanner shall be variable from 20
IR frames/40 fields to 62 IR frames/124 fields per second. For variable scan frequency
measurement and verification, see 4.5.1.1.
3.6.1.2 Specific scan frequency (60 Hz). (See 3.1)
3.6.1.3 Synchronous scan frequency. (See 3.1)
3.6.1.4 Scan angle. (See 3.1) The scan angle shall be determined as follows:
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