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

e. Voltage rating.

f. Current rating.

g. Terminal identification or circuit diagram (nonsymmetrical filters only).

h. Maximum operating power frequency (for ac rated filters only).

3.33.3 Minimum marking. When the physical size of the filter precludes the marking of the information in 3.33.2,

the minimum marking required shall be as specified in the specification sheet. In those cases where full marking

requirements are not on the filter, the full marking shall be marked on the unit package.

3.34 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally

preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the

operational and maintenance requirements, and promotes economically advantageous life cycle costs.

3.35 Workmanship. Filters shall be processed in such a manner as to be uniform in quality and shall be free from

cold soldering, corrosion, pits, dents, cracks, rough sharp edges, misalignments, and other defects that will affect life,

serviceability, or appearance. Cracks in glass seals are not allowed, however, minor meniscus crazing is acceptable.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein shall be classified as follows:

a. Qualification inspection (see 4.4).

(1) Verification of qualification (see 4.4.3).

b. In-process inspection (see 4.5.1 and 4.5.2).

c. Conformance inspection (see 4.5.3).

(1) Group A inspection (see 4.5.5).

(2) Group B inspection (see 4.5.6).

4.2 QPL system. The manufacturer shall establish and maintain a QPL system in accordance with 3.3. Evidence

of such compliance is a prerequisite for qualification and retention of qualification.

4.3 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance with the

test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202 except the temperature shall be

+18�C to +30�C, and the relative humidity shall not exceed 75 percent. In cases of dispute, the referee temperature

shall be +25�C � 3�C. Unless otherwise specified, the accuracy of all test voltages, currents, or resistances shall be

within 2 percent of that specified.

4.3.1 Reference measurements. When requirements are based on comparative measurements made before and

after conditioning, the reference measurement shall be considered the last measurement made at +25�C � 3�C prior

to conditioning. Unless reference measurements have been made within 30 days prior to the beginning of

conditioning, they shall be repeated.

4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the

Government (see 6.3) on sample units produced with equipment and procedures normally used in production.

4.4.1 Class B filters.

4.4.1.1 Sample. The number of units comprising a sample of filters to be submitted for qualification inspection

shall be as specified in table III and appendix A.