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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

4.5 In-process inspection and conformance inspection.

4.5.1 In-process inspection (class B filters). Each production lot of capacitors manufactured for use in class B

filters shall be inspected in accordance with MIL-PRF-31033 and Table IV (see 3.5.7.1).

TABLE IV. In-process inspection (class B filters).

Inspection

Requirement

Test method

Sample size

paragraph

See MIL-PRF-31033

MIL-PRF-31033 In-process

3.5.7.1a

Destructive physical analysis

3.5.7.1b

See MIL-PRF-31033

4.5.2 In-process inspection (class S filters). Each production lot shall be inspected in accordance with table V.

Other screening inspections may be applied at the option of the manufacturer, as approved by the qualifying activity.

TABLE V. In-process inspection (class S filters).

Inspection

Requirement

Test method

Sample size

paragraph

MIL-PRF-31033 In-process

3.5.7.2a

See MIL-PRF-31033

MIL-PRF-31033 group A

3.5.7.2b

See MIL-PRF-31033

MIL-PRF-31033 group B (except life)

3.5.7.2b

See MIL-PRF-31033

Visual inspection

3.6

4.6.1.2

100%

4.5.2.1 Rework of class S filters. Rework of class S filters is not allowed unless the rework procedure has been

approved by the qualifying activity. Once a capacitor has been soldered in place, it shall not be reworked.

4.5.3 Inspection of product for delivery.

4.5.3.1 Class B filters. Inspection of product for delivery shall consist of group A inspection.

4.5.3.2 Class S filters. Inspection of product for delivery shall consist of group A and B inspections.

4.5.4 Inspection lot.

4.5.4.1 Class B filters. An inspection lot shall consist of all filters of a single PIN, produced under essentially the

same conditions, and offered for inspection at one time.

4.5.4.2 Class S filters. An inspection lot for class S filters shall be of one design. As a minimum requirement, the

lot shall consist of all the filters of a single part number representing one design and processed as a single lot through

all manufacturing steps on the same equipment, and identified with the same date and lot code designation. In

addition, the lot shall conform to the following:

a. Capacitors used in each filter of an inspection lot shall be traceable to one part number and one lot date

code (LDC).

b. Each element, such as toroids, ferrite beads, finished cases, end seals, and wire lugs used in the design of

the filter shall be from a single manufacturer and traceable to a single lot date code.

c. Solder for each application shall be of a uniform composition from a single supplier.

d. All single process operations shall be done during one continuous run without changes in temperature,

pressure, or other processing controls.

e. A lot identifying number shall be assigned at the time the lot is assembled. This identifying number (LDC)

shall be maintained through acceptance.