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 Methods of inspection.

4.7.1 Visual and mechanical inspection.

4.7.1.1 External. Filters shall be examined to verify that the materials, external design and construction, physical

dimensions, marking, and workmanship are in accordance with the applicable requirements (see 3.1, 3.3, 3.4 to 3.4.3

4.7.1.2 Internal. Filters shall be disassembled and examined to verify that the materials, internal design and

construction, and workmanship are in accordance with the applicable requirements. For first article inspection,

examination of filters, which are normally furnished filled, shall be performed on one additional sample unit furnished

4.7.2 Terminal strength (see 3.5). Filters shall be tested in accordance with 4.7.2.1 to 4.7.2.3 inclusive, as

applicable (see 3.1). After completion of each applicable test, the tested terminal shall be examined for loosening,

rupturing, and other mechanical damage.

4.7.2.1 Pull test. Filters shall be tested in accordance with method 211, MIL-STD-202. The following details shall

apply:

Test condition letter: A.

Magnitude of applied force shall be as follows:

(1)

Solid-wire lead terminals (other than printed circuit terminals): In accordance with table X.

(2)

Solder terminals: In accordance with table X.

(3)

Printed circuit and pin-type terminals: 2 pounds.

TABLE X. Pull.

Cross-sectional area of

electrode at its smallest

Force

point at which lead from

external circuit connects

Circular mils

Pounds

≤ 2,000

2.0

> 2,000

5.0

Direction and application of applied force:

(1)

Solid-wire lead terminals (other than printed circuit terminals): The force shall be applied in the

direction of the axis of termination, and gradually increased from zero pounds to the magnitude

specified in table X (see 3.1).

(2)

Solder terminals: The force shall be applied to each terminal at the point where the lead from the

external circuit connects to it, and shall be gradually increased from zero pounds to the magnitude

specified in table X (see 3.1).

(3)

Printed circuit and pin-type terminals: The force shall be applied in the direction of the axis of the

terminal as shown in figure 7, and shall be gradually increased from zero to 2 pounds.