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 A

A.3.1.2 Other functional marking. A circuit diagram shall be marked on any surface of an adjustment type variable resistor (trimmers), in accordance with one of the optional diagrams shown on figure A-1.

FIGURE A-1. Circuit diagram and terminal identification (FSC 5905). A.3.2 Part identification marking.

A.3.2.1 Marking of resistors. Marking of resistors shall conform to method I or II, as specified in the acquisition document and as shown in table A-I.

A.3.2.2 Method I. Characteristics and rating shall be marked in the sequence (reading from left to right) of the columnar heading shown under "Order of Precedence" in table A-I. Where physical size of the part precludes the marking of all characteristics and ratings, marking requirements shall be specified in the acquisition document in the order of precedence shown by the numerical figures in table A-I.

TABLE A-I. Characteristics and rating marking requirements (FSC 5905).

Marking method for resistance type		Order of precedence
		Resistance	Resistance tolerance	Wattage	Temperature coefficient
Method	Resistor type
I II I 1/ I I	Fixed (wire-wound) Fixed (composition) Fixed (film) Variable Thermal (thermistor)	1 1 1 1 1	2 2 2 2 2	4 4 3	3 3 3

1/ Color-coding may be applicable in acquisition documents approved prior to this standard, and to subsequent revisions of such documents.

A.3.2.2.1 Fixed resistance numerical code. The fixed nominal resistance shall be expressed in ohms and is identified by four digits; the first three digits represent significant figures and the last digit specifies the number of zeros to follow. When the value of resistance is less than 100 ohms, or fractional values of an ohm are required, the letter "R" shall be substituted for one of the significant figures. The resistance value designations are shown in table A-II.