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

4.6 Methods of inspection.

4.6.1 Visual inspection.

4.6.1.1 External visual and mechanical inspection. Filters shall be examined to verify that the materials, design,

construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements

4.6.1.2 Visual inspection. Each element and subassembly shall be visually inspected under 10-power

magnification. Elements and subassemblies exhibiting any of the anomalies listed below shall be removed from the

lot and identified as rejects.

a. Discoidal capacitors. In accordance with MIL-PRF-31033.

b. Magnetics.

(1) Ferrite beads: Broken or cracked ferrites. Chipouts exceeding 10 percent of the cross-sectional area.

(2) Coil: Broken or cracked cores, sharp kinks, bends, or nicks that reduce the diameter of the wire 10

percent.

c. Housing (case): Burrs, damaged threads, flaking of plating, or dents. Minor cosmetic defects and salt

atmosphere damage in the thread area (due to torquing into metal plate for thermal shock test) is

acceptable.

d. Subassembly and precap inspection prior to potting.

(1) Excessive solder or bridging between inner and outer electrodes that reduce the termination clearance

to less than 75 percent of the radial distance between the inner and outer terminations.

(2)

Solder balls, solder spikes, solder splash, or loose solder.

(3)

Solder flux.

(4)

Coil or ferrite bead shall be inspected for anomalies listed in 4.6.1.2b.

(5)

Contamination that may affect proper operation.

(6)

Damage or plating defects on the case.

(7)

Lead damage.

(8)

Coil or ferrite bead is not insulated, or is touching side of case.

(9)

Coil wire or ferrite bead and filter center conductor are positioned such that they are able to touch the

side of the case during vibration or shock.

(10)

Capacitor disc is tilted more than 10 degrees.

(11)

Solder fillet around either the inner circumference or the outer circumference of the capacitors less

than 240 degrees.

(12)

For eyelet terminals, the feed-through connection wire not being visible from the external side of the

eyelet.