scope:

This specification covers the general requirements and quality and reliability assurance requirements for bulkwave quartz crystal oscillators designed for frequency control or timekeeping in Armed Services electronic equipment.

The military part number consists of the letter "M", the basic number of the specification sheet, the dash number and alphanumeric designators. An example of a part number is as follows:

The product assurance level is identified by a single letter B or S designating the device class.

The dash number uniquely identifies the crystal oscillator.

Crystal oscillators shall be of the following temperature ranges:

A - −55°C to +125°C (except class S) B - −55°C to +105°C C - −20°C to +70°C D - −55°C to +85°C E - −40°C to +85°C J - Other (see 3.1)

The oscillators types are identified by a single number as follows:

Type 1 - Crystal Oscillators (XO) (see 6.3.1). Type 2 - Voltage Controlled Crystal Oscillators (VCXO) (see 6.3.2). Type 3 - Temperature Compensated Crystal Oscillators (TCXO) (see 6.3.3). Type 4 - Oven Controlled Crystal Oscillators (OCXO) (see 6.3.4). Type 5 - Temperature Compensated-Voltage Controlled Crystal Oscillators (TCVCXO) (see 6.3.5). Type 6 - Oven Controlled-Voltage Controlled Crystal Oscillator (OCVCXO) (see 6.3.6). Type 7 - Microcomputer Compensated Crystal Oscillator (MCXO) (see 6.3.7). Type 8 - Rubidium-Crystal Oscillators (RbXO) (see 6.3.8).

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Army Laboratory Command, ATTN: SLCET-RS, Fort Monmouth, NJ 07703-5302, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The military part number (see 1.2.1) and the specified nominal frequency (see 1.2.4) define an item of supply.

The specified nominal frequency expressed in Hertz is identified by a fixed field of 8 characters consisting of 7 digits and a letter (H, K, or M) representing, simultaneously, the decimal point and the appropriate multiplier as follows.

a. Less than 1 Hertz and less than 1,000 Hertz, the letter "H" is used to represent the decimal point and multiplier.

b. Greater than or equal to 1,000 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.

All digits preceding and following the letter (H, K, or M) of the group represent significant figures.

The following are examples of using the 8 characters in constructing the specified frequency.

Designation Frequency H0100000 to H9999999 .01 to .9999999 hertz, incl. 1H000000 to 9H999999 1.0 to 9.999999 hertz, incl. 10H00000 to 99H99999 10 to 99.999999 hertz, incl. 100H0000 to 999H9999 100 to 999.9999 hertz, incl. 1K000000 to 9K999999 1 to 9.999999 kilohertz, incl. 10K00000 to 99K99999 10 to 99.99999 kilohertz, incl. 100K0000 to 999K9999 100 to 999.9999 kilohertz, incl. 1M000000 to 9M999999 1 to 9.999999 megahertz, incl. 10M00000 to 99M99999 10 to 99.99999 megahertz, incl. 100M0000 to 999M9999 100 to 999.9999 megahertz, incl.

This appendix contains the details of the quality assurance program which serves as the basis for qualification. This appendix is a mandatory part of the specification. The information contained herein is intended for compliance only.

intended Use: