MIL-DTL-3970F
4.7.3 Insertion loss (see 3.6). The insertion loss of the assembly shall be measured over the specified frequency
range (see 3.1), using the test set-up of figure 3 (or equivalent). Test equipment shall be capable of providing a
continuous measurement of insertion loss over the required frequency ranges. A means shall be provided for
producing a permanent record of the assembly's insertion loss versus frequency. The measurement system and
permanent record shall provide minimum accuracy of 0.08 dB over the frequency ranges 0.32 through 2.6 GHz and
above 26.5 GHz and 0.04 dB over the frequency ranges 2.6 through 26.5 GHz.
FIGURE 3. Insertion loss test setup (or equivalent).
4.7.4 Pressurization (see 3.7). The assembly shall be subjected to the internal air pressure in pound-force (lbf)
specified (see 3.1), while immersed in water. The temperature of the water shall be 20°C ± 5°C. Any bubbles
coming from within the assembly shall be considered as leakage. Bubbles which are the result of entrapped air on
the exterior parts of the assembly shall not be considered as leaks. After the test VSWR shall be measured as
specified in 4.7.2.
4.7.5 Salt atmosphere (corrosion) (see 3.8). Assemblies shall be tested in accordance with MIL-STD-202, method
101. The waveguide ends should be capped prior to this test. The following details shall apply:
a.
Special mounting: Not applicable.
b.
Test condition letter: B.
c. Measurement after exposure: VSWR and insertion loss shall be measured as specified in 4.7.2 and 4.7.3,
respectively. The assembly shall be visually inspected for evidence of destructive corrosion.
4.7.6 Vibration, high frequency (see 3.9). Assemblies shall be tested in accordance with MIL-STD-202, method
204. The following details shall apply:
a.
Mounting: Rigidly mounted to an appropriate nonresonant mounting table.
b.
Electrical load: Not applicable.
c.
Test condition letter: A.
d.
Resonance: Not applicable.
e. Measurements after vibration. VSWR insertion loss, and pressurization shall be measured in 4.7.2, 4.7.3,
and 4.7.4,respectively.
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