MIL-T-26219A
3.5.1 General layout. The general layout of the test set shall conform
substantially to Figures 1 and 2. The detailed mechanical and electrical
design of the test set shall be accomplished by the contractor subject to the
requirements specified herein, these requirements being detailed only to the
extent considered necessary to obtain the desired mechanical and electrical
characteristics, performance, and permanence of the same. The design, layout
and assembly of the test set and its component parts shall be such as to
facilitate quantity production and ease of maintenance and operation.
3.6 Performance.
The test set shall be capable of meeting the test
requirements specified in section 4 when subjected to the following conditions:
a.
Temperature.
Temperatures ranging from -55°C (-67°F) to +71°C
(160°F)
b.
Vibration.
Vibration at frequencies varying between 10-55 cycles
0.006 inch for a period of 1 hour in
per second at a total excursion of 0.03
each of three mutually perpendicular axes.
c.
Endurance.
Intermittent operation (15
2 minutes on 15
2
50 rpm.
minutes off) for a period of 48 hours while operating at 4000
d.
Humidity.
Relative humidity up to 100 percent for a period of 240
hours (10 cycles).
3.7.1 Electron tubes and transistors. Electron tubes shall conform to MIL-
E-1.
Selection of tubes shall be in accordance with MIL-E-4682. Transistors
shall be subject to approval by the acquiring activity.
3.8 Case.
The test set shall be enclosed in a carrying case as shown on
Figure 1. The
storage compartment may be located as shown or on the left side
of the panel.
The case shall be so designed to facilitate inspection and
maintenance of
the component parts incorporated therein.
3.8.1 Case material.
The case and control panel shall be fabricated from
aluminum alloy conforming to QQ-A-318. Material required for reinforcement
purposes shall conform to QQ-A-315, as applicable.
The thickness of the
material employed shall be such as to produce a sturdy case.
3.8.2 Case finish.
The inside and outside surfaces of the case, including
the panel, shall be anodized in accordance with MIL-A-8625. Th inside and
outside of the case shall be finished in final form in accordance with U.S.
Air Force Bulletin F29, code F29-8, color 13538 as specified in FED-STD-595.
The outside surface of the panel shall be finished in lusterless black.
3.8.3 Dimensions. The outside dimensions of the case, including the
projections introducted by the latches, feet and handle when folded down,
shall be maintained within a maximum length of 21 inches, a width of 10
inches, and depth of 12 inches.
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