MIL-STD-1285-SUP-2 Marking of Electrical and Electronic PartsThis standard establishes requirements for the physical marking of electrical and electronic parts. This standard should be implemented by incorporating suitable requirements directly in acquisition documents.

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MIL-STD-1285D

APPENDIX C

FSC 5915 - FILTERS AND NETWORKS

C.1 SCOPE

C.1.1 Scope. The following define the requirements that pertain to both commercial and military electronic devices. Where the requirements are not stated, refer to sections 4 and 5 herein. This appendix is a mandatory part of this standard. The information contained herein is intended for compliance.

This appendix establishes the marking requirements that apply to a specific FSC. These requirements are to be applied in addition to the requirements of sections 4 and 5 herein. In the event of conflict between this appendix and section 4 or 5, the appendix shall take precedence.

C.2 APPLICABLE DOCUMENTS. This section is not applicable to this appendix. C.3 GENERAL REQUIREMENTS

C.3.1 Functional marking.

C.3.1.1 Terminal identification. Terminals shall be identified as to their function (such as, "INPUT", "OUTPUT", "COMMON", "CASE") using numerals, alphabetic symbols, or their functional names, as specified in the acquisition document. Terminals of radio frequency interference filters need not be identified as to function if the filter is electrically symmetrical. If the filter is not electrically symmetrical, the input or output terminals shall be identified. Broadband electromagnetic interference (EMI) filters which utilize the inductive input, or capacitive input "L" electrical circuit configurations shall be marked such that the symbol "C" (indicating capacitive input), or the symbol "L" indicating inductive input is marked on the filter case at the threaded end of the filter.

C.3.1.2 Other functional marking. Electrical circuit diagrams, cautionary markings, and other markings and symbols shall be as specified in the acquisition document.

C.3.2 Part identification marking.

C.3.2.1 Filter and radar pulse network marking. Marking of filter and radar pulse forming networks shall conform to method I.

C.3.2.2 High-pass, low-pass, band-pass, band-suppression, and dual functioning.

C.3.2.2.1 Type marking. Marking shall include the type of filter function (such as high-pass, low-pass, band- pass, band suppression), and the discrimination characteristics referring to the applicable frequencies specified in the acquisition document. Where the lack of space prohibits the inclusion of discrimination characteristics, the design (nominal) center frequency shall be marked on the case for band-pass and band-suppression filters, and the cutoff frequency shall be marked on the case for high-pass and low-pass filters.

C.3.2.2.2 Ratings. Source and load impedance rating shall be marked on the filters in accordance with the requirements specified in the acquisition document. In addition, any other ratings such as dc voltage rating or signal-input voltage rating shall be marked on filters in accordance with the requirements specified in the acquisition document.