electromagnetic interference. Filters furnished to the requirements of this specification contain shunting ceramic discoidal capacitors and series inductors \(FSC 5915\). Capacitors furnished to the requirements of this specification contain shunting ceramic discoidal capacitors \(FSC 5910\). For the purposes of this specification, feed-through capacitor types \(C circuit configuration\) are referred to herein as a filter. Passband power may be alternating current \(ac\) or direct current \(dc\) and the filters used primarily in the reduction of broadband radio frequency interference. This specification provides for two levels of product assurance requirements. Filters covered by this specification are capable of operation over the temperature range of -55 degrees C to +125 degrees C.

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MIL-PRF-28861D

c. Cooling time prior to final examinations and measurements: Sufficient time shall be allowed for the filters to

stabilize at room ambient temperature. Filters shall then be examined for evidence of physical damage and

Insertion loss (25�C) and insulation resistance (25�C) shall be measured in accordance with 4.6.5 and

4.6.13 respectively.

4.6.20 Salt atmosphere (corrosion) (see 3.25). Filters shall be tested in accordance with method 101 of

MIL-STD-202. The following details and exceptions shall apply:

a. Test condition A (96 hours).

b. Visual inspection: After completion of the test, filters shall be visually inspected for corrosion and

obliteration of marking.

4.6.21 Destructive physical analysis (see 3.26). Filters shall be inspected in accordance with appendix B of this

specification.

4.6.22 Shock (specified pulse) (see 3.27). Filters shall be tested in accordance with method 213 of

MIL-STD-202. The following details and exceptions shall apply:

a. Mounting: Securely fastened by normal mounting means; when applicable, leads and connecting wires

must be supported to prevent damage to the filter.

b. Test condition.

(1) Class B filters: Test condition I (100 g's).

(2) Class S filters: Test condition F (1,500 g's).

c. Electrical load during shock: During the test, a potential of 100 percent of dc rated voltage shall be applied

between the terminals and case.

d. Measurements during test: Monitor for intermittent open- or short-circuiting.

e. Measurements after the test (Qualification inspection only): Filters shall be subjected to the insertion-loss

test (see 4.6.5).

4.6.23 Terminal strength (see 3.28). Filters shall be tested in accordance with method 211 of MIL-STD-202. The

following details and exceptions shall apply:

a. Test condition A (pull test).

b. Applied force: 5 pounds.

c. Inspection after test: Filters shall be visually inspected for evidence of loosening or rupturing of the terminals.

4.6.24 Moisture resistance (hermetically sealed filters only) (see 3.29). Filters shall be tested in accordance with

method 107 of MIL-STD-202, test condition A (except at step 3 temperature shall be +125�C +3�C, -0�C) and no

measurements shall be made before and after cycling. Filters shall then be tested in accordance with method 106 of

MIL-STD-202. The following details and exceptions shall apply:

a. Mounting: Securely fastened by normal mounting means.

b. Initial measurements: Not applicable.

c. Polarization voltage: During steps 1 to 6, inclusive, a dc potential of 100 volts or rated voltage, whichever

is less shall be applied between the terminals and case. The potential applied to the terminals shall be

positive with respect to the case.