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MIL-F-18327 Filters; High Pass, Low Pass, Band Pass, Band Suppression, And Dual Functioning, General Specification ForThis specification covers the general requirements for passive frequency-selective networks, such as dual functioning, band suppression, band pass, low pass, and high pass \(or any combination thereof\) electric-wave filters, including those employing electromechanical and piezoelectric elements, for use over the frequency range of 0 to 500 megahertz. Filters covered by this specification are intended for use where operation under various environmental conditions is required. This specification covers filters weighing not more than 50 pounds and requiring root-mean-square test voltage ratings not greater than 5,000 volts.

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MIL-F-18327F
4.7.14 Thermal shock (see 3.17). Filters shall be tested in accordance with method 107, MIL-STD-202. the
following details and exceptions shall apply:
a.
Test condition letter: A, except that step 3 shall be at the maximum operating temperature for the class
b.
Measurements after cycling: Filters shall be subjected to the dielectric withstanding voltage and insulation
resistance tests as specified in 4.7.6 and 4.7.7, respectively, and shall then be examined for evidence of
leakage and physical damage.
4.7.15 Immersion (see 3.18). Filters shall be tested in accordance with method 104, MIL-STD-202. The following
details and exceptions shall apply:
a.
Test condition letter:
(1)
A: For grades 5, 7, and 9.
(2)
B: For grades 4, 6, and 8.
b.
Measurements after final cycle: Filters shall be washed under running tap water and dried. After the drying
period, filters shall be subjected to the dielectric withstanding voltage and insulation resistance tests
specified in 4.7.6 and 4.7.7, respectively, and shall then be examined for evidence of leakage and physical
damage.
4.7.16 Moisture resistance (see 3.19). Filters shall be tested in accordance with method 106, MIL-STD-202. The
following details and exceptions shall apply:
a.
Conditioning: For grades 4, 6, and 8 filters, the 24-hour initial drying period prior to the first cycle may be
omitted.
b.
Initial measurements: Not applicable.
c.
Polarization voltage: Unless otherwise specified (see 3.1), polarization is applicable. The polarizing
voltage shall be applied during steps 1 to 6 inclusive, between all ungrounded terminals and the mounting
means. The polarizing voltage shall be positive with respect to the mounting means.
d.
Loading voltage: Not applicable.
e.
Final measurements: Upon completion of step 6 of the final cycle, the filters shall be removed from the
humidity chamber and shall be conditioned for 4 to 24 hours at the inspection conditions specified in 4.3.
After this conditioning period, the filters shall be subjected to the dielectric withstanding voltage and
insulation resistance tests specified in 4.7.6 and 4.7.7, respectively, and shall then be examined for
evidence of leakage and physical damage.
4.7.17 Salt atmosphere (when specified, see 3.1) (see 3.20). Filters shall be tested in accordance with method
101, MIL-STD-202. The following detailed requirements shall be as specified (see 3.1).
a.
Special mounting, if applicable.
b.
Test condition letter, as specified, see 3.1.
c.
Measurements after exposure.
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