MIL-STD-202H.pdf - 第5页

MIL - S TD - 202H 1. SCOPE 1.1 Purpos e. This st anda r d e s t ab l i s hes un i f or m m e t ho ds f or t es t i ng el e c t r on i c and el e c t r i c al c omponent par ts, includ ing basic env ironmental t ests to d…

MIL-STD-202H

CONTENTS

PARAGRAPH Page

1. SCOPE ................................................................................................................... 1

1.1 Purpose ............................................................................................................... 1

1.2 Test method numbering system .......................................................................... 1

1.2.1 Class of tests ....................................................................................................... 1

1.2.2 Revision of test methods ..................................................................................... 1

1.3 Method of reference ............................................................................................ 1

2. APPLICABLE DOCUMENTS .................................................................................. 1

2.1 General ............................................................................................................... 1

2.2 Government documents ...................................................................................... 1

2.2.1 Specifications, standards, and handbooks .......................................................... 1

2.2.2 Other government documents, drawings, and publications ................................. 2

2.3 Non-Government publications ............................................................................. 2

2.4 Order of precedence ........................................................................................... 2

3. DEFINITIONS ......................................................................................................... 2

4. GENERAL REQUIREMENTS ................................................................................. 2

4.1 Test requirements ........................................................................................ 2

4.2 Test conditions ............................................................................................. 2

4.2.1 Permissible temperature variation in environmental chambers .................... 2

4.3 Reference conditions ................................................................................... 2

4.4 Calibration requirements ..............................................................................

5. DETAILED REQUIREMENTS ................................................................................ 3

6. NOTES ................................................................................................................... 3

6.1 Intended use ................................................................................................ 3

6.2 Sequence of tests ........................................................................................ 3

6.3 Cancelled methods ...................................................................................... 3

6.4 Chemical listing ............................................................................................ 4

6.5 Subject term (key word) listing ..................................................................... 4

6.6 Numerical index of test methods .................................................................. 5

6.7 Change notations ......................................................................................... 6

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MIL-STD-202H

1. SCOPE

1.1 Purpose. This standard establishes uniform methods for testing electronic and electrical component parts, including

basic environmental tests to determine resistance to deleterious effects of natural elements and conditions surrounding military

operations, and physical and electrical tests. For the purpose of this standard, the term "component parts" includes such

items as capacitors, resistors, switches, relays, transformers, inductors, and others. This standard is intended to apply only to

small component parts, weighing up to 300 pounds or having a root mean square test voltage up to 50,000 volts unless

otherwise specifically invoked. The test methods described herein have been prepared to serve several purposes:

a. To specify suitable conditions obtainable in the laboratory that give test results equivalent to the actual service

conditions existing in the field, and to obtain reproducibility of the results of tests. The tests described herein are not

to be interpreted as an exact and conclusive representation of actual service operation in any one geographic

location, since the only true test for operation in a specific location is an actual service test at that point.

b. To describe in one standard (1) all of the test methods of a similar character which appeared in the various joint or

single-service electronic and electrical component parts specifications, (2) those test methods which are feasible for

use in several specifications, and (3), the recognized extreme environments, particularly temperatures, barometric

pressures, etc., at which component parts will be tested under some of the presently standardized testing

procedures. By so consolidating, these methods may be kept uniform and thus result in conservation of equipment,

man-hours, and testing facilities. In achieving these objectives, it is necessary to make each of the general tests

adaptable to a broad range of electronic and electrical component parts.

c. The test methods described herein for environmental, physical, and electrical tests shall also apply, when applicable,

to parts not covered by an approved military specification, military sheet form standard, specification sheet, or

drawing.

1.2 Test method numbering system. The test methods are designated by numbers assigned in accordance with the

following system:

1.2.1 Class of tests. The tests are divided into three classes: Test methods numbered 101 to 199 inclusive, cover

environmental tests; those numbered 201 to 299 inclusive, cover physical characteristics tests; and those numbered 301 to

399 inclusive, cover electrical characteristics tests. Within each class, test methods are serially numbered in the order in

which they are introduced into this standard.

1.2.2 Revision of test methods. Revisions of test methods are indicated by a letter following the method number. For

example, the original number assigned to the moisture resistance test method is -106; the first revision of that method

“-106A”, the second revision, “-106B”, etc.

1.3 Method of reference. When applicable, test methods contained herein shall be referenced in the individual specification

by specifying this standard with the dash number(-xxx) or this standard with the method number, and the details required in

the summary paragraph of the referenced method. To avoid the necessity for changing specifications which refer to this

standard, the revision letter following the method number shall not be used when referencing test methods. The preferred

wording to reference a method starting with revision H is “MIL-STD-202-106”; “MIL-STD-202, method 106” is still acceptable.

2. APPLICABLE DOCUMENTS

2.1 General. 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

of this standard, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, 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 cited in the

solicitation or contract.

FEDERAL SPECIFICATIONS

This section is not applicable to this standard.

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MIL-STD-202H

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.

This section is not applicable to this standard.

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein.

Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)

NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment

(Copies of this document are available online at www.ncsli.org)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, 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.

4. GENERAL REQUIREMENTS

4.1 Test 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.

4.2 Test 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.

4.3 Reference 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.

4.4 Calibration 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

NCSL Z540.3 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 NCSL

Z540.3 or equivalent.

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