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 J

J.3.2 Part identification marking.

J.3.2.1 Oscillators and crystal units. The frequency shall be specified to the final Hertz and shall be identified by a fixed field of eight characters consisting of seven digits and a letter (H, K, M, or G) representing simultaneously, the decimal point and the appropriate multiplier as follows:

a. Less than 1 Hertz and less than 1,OOO Hertz, the letter "H" is used to represent the decimal point and multiplier.

b. Greater than or equal to 1,OOO Hertz, but less than 1 Megahertz, the letter "K" is used to represent the decimal point and multiplier.

c. Greater than or equal to 1 Megahertz, the letter "M" is used to represent the decimal point and multiplier. d. Greater than or equal to 1 Gigahertz, the letter "G" is used to represent the decimal point and multiplier.

All digits preceding and following the letter (H, K, M, or G) of the group represent significant figures. The following are examples of using the eight characters in constructing the specified frequency.

Designation Frequency

HO1OOOOO to H9999999

1HOOOOOO to 9H999999

1OHOOOOO to 99H99999

1OOHOOOO to 999H9999

1KOOOOOO to 9K999999

1OKOOOOO to 99K99999

1OOKOOOO to 999K9999

1MOOOOOO to 9M999999

1OMOOOOO to 99M99999

1OOMOOOO to 999M9999

1GOOOOOO to 9G999999

1OGOOOOO to 99G99999

1OOGOOOO to 999G9999

.O1 to .9999999 Hertz, inclusive

1.O to 9.999999 Hertz, inclusive

1O to 99.999999 Hertz, inclusive

1OO to 999.9999 Hertz, inclusive

1 to 9.999999 kilohertz, inclusive

1O to 99.99999 kilohertz, inclusive

1OO to 999.9999 kilohertz, inclusive

1 to 9.999999 megahertz, inclusive

1O to 99.99999 megahertz, inclusive

1OO to 999.9999 megahertz, inclusive

1 to 9.999999 gigahertz, inclusive

1O to 99.99999 gigahertz, inclusive

1OO to 999.9999 gigahertz, inclusive

J.3.2.2 Marking location.

J.3.2.2.1 Crystal units marking. The identifying number, frequency, and source code shall be located symmetrically with respect to the center axis of the crystal holder.

J.3.2.2.2 Crystal ovens marking. Part identification shall be marked on the side of the case.