MIL-STD-202H.pdf - 第7页

MIL - S TD - 202H 5. DETAILED REQUIRE M E N T S This secti on is not ap plicabl e t o t hi s s t and ar d. 6. NOTES (This secti on contain s infor m at i on o f a g ener al or ex pl anat or y nat ur e w hi c h m ay be he…

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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MIL-STD-202H

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.

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 I (all samples) Group lla (part of a sample) Group llb (part of a sample)

Visual inspection Shock Resistance to soldering heat

Mechanical inspection Acceleration Terminal Strength

Electrical measurements Vibration Thermal Shock

Hermetic seal test (if applicable)

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

Moisture resistance or seal test on hermetically sealed parts

6.3 Cancelled methods

Method 102, Temperature Cycling is cancelled, when specified Method 107 is used.

102 test condition 107 test condition

A, B, and D

Methods 202 (Shock, specimens weighing not more than 4 pounds) and 205 (Medium Impact) are cancelled, when specified

use Method 213.

202 or 205

test condition

213

test condition

A 15g (pk) K 30g (sawtooth)

B 30g (pk) H 75g (sawtooth)

C 50g (pk) I 100g (sawtooth)

Method 216 (Resistance to Solder Wave Heat) is cancelled, when specified Method 210 is used.

216 test condition 210 test condition

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MIL-STD-202H

6.4 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:

Material CAS number Test method

ethylbenzene 100-41-4 215

fluorocarbon/perfluorocarbon ----------- 107, 112, 210

helium 7440-59-7 112

hydrochloric acid 47-01-0 101

isopropyl alcohol 67-63-0 215

kerosene 8008-20-6 215

krypton-85 13983-27-2 112

mineral oil 8012-95-1 112

mineral spirits 8052-41-3 215

monoethanolamine 141-43-5 215

n-hexane 110-54-3 109

peanut oil 8002-03-7 112

propane 74-98-6 111

propylene glycol monomethylether 107-98-2 215

silicone oil 63148-58-3 112

sodium chloride 7647-14-5 104

sodium hydroxide 1310-73-2 101

terpene ------------ 215

6.5 Subject term (key word) listing.

Barometric pressure

Contact chatter/resistance

Current noise

Current switching

DC resistance

Dielectric withstanding voltage

Explosion

Flammability

Humidity

Immersion

Insulation resistance

Life

Moisture resistance

PIND

Radiographic inspection

Random drop

Resistance to soldering heat

Resistance to solvents

Salt atmosphere

Sand and dust

Solderability

Terminal strength

Thermal shock

Vibration

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