Материал: Стандарт MIL-STD-202G

MIL-STD-202G

2. APPLICABLE DOCUMENTS

2.1General. The documents listed in this section are specified in sections 3, 4, 5, and individual test methods of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3, 4, 5, and the individual test methods, whether or not they are listed.

2.2Government documents.

2.2.1Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation.

SPECIFICATIONS

DEPARTMENT OF DEFENSE

MIL-PRF-680 - Degreasing Solvent

MIL-S-901 - Shock Tests, HI (High Impact), Shipboard Machinery, Equipment and Systems, Requirements For

MIL-DTL-1222 - Studs, Bolts, Hex Cap Screws, Socket Head Cap Screws and Nuts

MIL-I-24768/14 - Insulation, Plastic, Laminated, Thermosetting, Cotton-Fabric-Base, Phenolic-Resin (FBG)

FEDERAL

QQ-B-654 - Brazing Alloys, Silver

QQ-S-698 - Steel, Sheet and Strip, Low Carbon

TT-I-735 - Isopropyl Alcohol

2.2.2 Other government documents, drawings, and publications. The following other government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation.

CODE OF FEDERAL REGULATIONS (CFR)

10 CFR 20 - Standards For Protection Against Radiation

10 CFR 30 - Rules of General Applicability to Domestic Licensing of Byproduct Material

10 CFR 31 - General Domestic Licenses For Byproduct Material

10 CFR 32 - Specific Domestic Licenses to Manufacture or Transfer Certain Items Containing Byproduct Material

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2.3 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the document(s) that are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2).

ACOUSTICAL SOCIETY OF AMERICA

ASA 2.2-1959 - Methods for the Calibration of Shock and Vibration Pickups

(Application for copies should be addressed to Acoustical Society of America, 120 Wall Street, 32nd Floor, New York, NY 10005-3993.)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI/NCSL Z540-1 - Calibration Laboratories and Measuring and Test Equipment, General Requirements

ANSI/J-STD-002 - Solderability Tests For Component Leads, Terminations, Lugs, Terminals and Wires

ANSI/J-STD-004 - Requirements For Soldering Fluxes

ANSI/J-STD-005 - Requirements For Soldering Pastes

ANSI/J-STD-006 - Requirements For Electronic Grade Solder Alloys and Fluxed and Non-Fluxed Solid Solders For Electronic Soldering Applications

(Application for copies should be addressed to the American National Standards Institute, Incorporated, 1430 Broadway, New York, NY 10018.)

AMERICAN SOCIETY FOR TESTING AND MATERIALS

ASTM A-519-96 - Standard Specification For Seamless Carbon and Alloy Steel Mechanical Tubing

(Application for copies should be addressed to the American National Standards Institute, Incorporated, 1430 Broadway, New York, NY 10018.)

INSTITUTE FOR INTERCONNECTING AND PACKAGING ELECTRONIC CIRCUITS

(Application for copies should be addressed to the Institute for Interconnecting and Packaging Electronic Circuits, 2215 Sanders Road, Northbrook, IL 60062-6131.)

(Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.)

2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. DEFINITIONS

This section is not applicable to this standard.

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4. GENERAL REQUIREMENTS

4.1Test requirements. The requirements which must be met by the component parts subjected to the test methods described herein are specified in the individual specifications. Whenever this standard conflicts with the individual specification, the latter shall govern.

4.2Test conditions. Unless otherwise specified herein, or in the individual specification, all measurements and tests shall be made at temperatures of 15°C to 35°C (59°F to 95°F) and at ambient air pressure and relative humidity. Whenever these conditions must be closely controlled in order to obtain reproducible results, for referee purposes, a

temperature of 25°C, +0°C, -2°C (77°F, +0°F, -3.6°F), relative humidity of 50 ±2 percent, and atmospheric pressure of 650 to 800 millimeters of mercury shall be specified.

4.2.1 Permissible temperature variation in environmental chambers. When chambers are used, specimens under test shall be located only within the working area defined as follows:

a.Temperature variation within working area: The controls for the chamber shall be capable of maintaining the temperature of any single reference point within the working area within ±2°C (3.6°F).

b.Space variation within working area: Chambers shall be so constructed that, at any given time, the temperature of any point within the working area shall not deviate more than 3°C (5.4°F) from the reference point except for the immediate vicinity of specimens generating heat.

4.3Reference conditions. Reference conditions as a base for calculations shall be 25°C (77°F) for temperature, or an alternate temperature of 20°C (68°F), 760 millimeters of mercury for air pressure, and a relative humidity of 50 percent.

4.4Calibration requirements. Calibration shall be applied to those items of measuring and test equipment used to assure product compliance with specifications and contractual requirements. Calibration shall be performed in accordance with the requirements of ANSI/NCSL Z540-1 or equivalent. Calibrated items shall be controlled, used, and stored in a manner suitable to protect calibration integrity. Test equipment requiring calibration shall be identified and labeled in accordance with ANSI/NCSL Z540-1 or equivalent.

5. DETAILED REQUIREMENTS

This section is not applicable to this standard.

6. NOTES

(This section contains information of a general or explanatory nature which may be helpful, but is not mandatory).

6.1 Intended use. This test method standard specifies uniform procedures for the environmental, physical, and electrical testing of electronic and electrical component piece parts. It is intended as a reference document for test requirements called out in military component specifications and when specified, in other procurement specifications and drawings.

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6.2 Sequence of tests. The sequence of tests that follow is provided for guidance to specification writers to emphasize the philosophy that parts be mechanically and thermally stressed prior to being subjected to a moisture resistance test. Within any of the three groups and subgroups, the order is preferred but not mandatory. It is recommended that this sequence be followed in all new specifications and when feasible, in revisions of existing specifications. In the case of hermetically sealed parts, when a moisture resistance test is not required, a high sensitivity seal test may be used in lieu of the moisture resistance test.

Group III (all units which have passed group II tests)

Moisture resistance or seal test on hermetically sealed parts

6.3 Chemical listing. The following is a list of chemicals and their chemical abstracts service (CAS) registry number identified for use in MIL-STD-202 test methods:

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MIL-STD-202G

6.4Subject term (key word) listing.

Acceleration Barometric pressure Capacitance

Contact chatter/resistance Current noise

Current switching DC resistance

Dielectric withstanding voltage Explosion

Flammability Humidity Immersion

Insulation resistance Life

Moisture resistance PIND

Quality factor Radiographic inspection Random drop

Resistance-temperature characteristic Resistance to soldering heat Resistance to solvents

Salt atmosphere Sand and dust Shock Solderability Terminal strength Thermal shock Vibration

Voltage coefficient

6.5Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.

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