MIL-P-50307(mu)
Standard
requirements in the "Test Facilities" requirement of MIL-F-13926C
vibration equipment provided shall have provisions for controlling the
frequency and amplitude of vibration in accordance with 3.7.1.1 a n d
3.7.1.2.
Vibration equipment shall have provisions for holding t h e projector se-
curely throughout vibration tests, and allow its orientation in three
mutually perpendicular planes for Vibration A and in one plane only for
Vibration B to simulate t h e projector's position when mounted for use. A
standard time measuring instrument shall be provided to control vibration
periods. A multi-station pressure tester having at least the functional
accuracies of Item 8 in 4.5.2.4 shall be provided along with a dew-point
tester and regulator. A spring scale and gage (Item 4 in 4.5.2.4) to
Unless otherwise specified,
measure force values shall also be provided,
test equipment herein shall be of standard commercial quality.
b . Optical test equipment.- Inspection equipment having
at least the functional accuracies of Items 1, 2, and 3 in 4.5.2.4 shall
be provided. A b e n c h l e v e l a n d s u r f a c e p l a t e c a p a b l e o f b e i n g c r o s s -
leveled or other means to accomplish this objective, shall also be pro-
On the surface plate, mediums shall be provided to h o l d ,
position,
vided.
the
and secure, along specified geometric lines in compliance with 3.7,
projector-collimator, auxiliary telescope, and projector under test.
Figure 1, the instructions herein or on test fixture drawings shall be
When
utilized, as applicable, to accomplish the orientation in 3.7.
the crosshair intersection on retitles of an auxiliary telescope and
`rejector-collimator are in coincidence, the means provided in 4.5.2.4
shall assure that t h e
line of sight obtained establishes line W in Figure 1 -
in proper relationship to all other geometric lines depicted in Figure 1.
Test targets.- The test target pattern shall contain
co
Lines
two concentric circles, a vertical line and a horizontal line.
shall bisect each other at the center of all circles and l i n e e x t r e m i t i e s
shall exceed the larger circle's diameter. O n a
wall target, actual circle
diameter shall equal the chord length of an arc which intersects both
legs of the angle subtended at the target's location. This angle s h a l l
be 29 rolls for the smaller circle and 31 roils for the larger circle. The
test target provided for the vibration test shall have a circle which
subtends a 10 mil angle. Targets shall contain acceptance limits for op-
I
tical requirements to be inspected. On wall targets, strategically loca-
ted mil blocks may be provided and their size determined as follows:
MIL
BLOCK SIZE - TARGET DISTANCE (in inches) .
1000
E l e c t r i c a l t e s t e q u i P m e n t . - Ark electrical power source
d.
(Item 7, in 4.5.2.4) shall be provided to supply the direct current (de)
Electrical
potential in proper polarity required by individual tests.
instrumentation (Item 5 and 6 in 4.5.2.4). shall be provided to measure
and monitor the electrical performance o f the projector under test, and
flexible conductors shall be provided to connect electrical instrumentation
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