MIL-STD-202H.pdf - 第234页

MI L - S TD - 202 - 301 5. DETAILED REQUI RE M E N T S 5.1 Summary . The fol l ow i ng det ai l s ar e t o be s p ec i f i ed i n t h e i nd i v i dua l s pec i f i c at i on: a. Special preparat i o ns or c ond i t i on…

MIL-STD-202-301

4.1.2 Voltage measuring device. A voltmeter shall be used to measure the applied voltage to an accuracy of at

least 5 percent, unless otherwise specified. When a transformer is used as a high voltage source of alternating

potential, a voltmeter connected across the primary side or across a tertiary winding may be used provided it is

previously determined that the actual voltage across the test specimen will be within the allowable tolerance under

any normal load condition.

4.1.3 Leakage current measuring device. When any leakage current requirement is specified, a suitable method

shall be used to measure the leakage current to an accuracy of at least 5 percent of the specified requirement.

4.1.4 Fault indicator. Suitable means shall be provided to indicate the occurrence of disruptive discharge and

leakage current in case it is not visually evident in the specimen. The voltage measuring device of 4.1.2, the leakage

current measuring device of 4.1.3, or an appropriate indicator light or an overload protective device may be used for

this purpose.

4.2. Procedure

4.2.1 Preparation. When special preparations or conditions such as special test fixtures, reconnections,

grounding, isolation, or immersion in water are required, they shall be specified.

4.2.2 Test voltage. Specimens shall be subjected to a test voltage of the magnitude and nature (ac or dc)

specified.

4.2.3 Points of application. The test voltage shall be applied between mutually insulated portions of the specimen

or between insulated portions and ground as specified. The method of connection of the test voltage to the specimen

should be specified only when it is a significant factor.

4.2.4 Rate of application. The test voltage shall be raised from zero to the specified value as uniformly as

possible, at a rate of approximately 500 volts (rms or dc) per second, unless otherwise specified. At the option of the

manufacturer, the test voltage may be applied instantaneously during inplant quality conformance testing.

4.2.5 Duration of application. Unless otherwise specified, the test voltage shall be maintained at the specified

value for a period of 60 seconds for qualification testing. For inplant quality conformance testing, when specified,

reduced time with a possible correlated higher test voltage may be used. Specimens with movable parts shall be

tested as specified, in a manner to assure that repeated stresses are not applied to the same dielectric. Upon

completion of the test, the test voltage shall be gradually reduced to avoid surges. At the option of the manufacturer,

the test voltage may be removed instantaneously during inplant quality conformance testing.

4.2.6 Examination and measurement of specimen. During the dielectric withstanding voltage test, the fault

indicator shall be monitored for evidence of disruptive discharge and leakage current. Following this, the specimen

shall be examined and measurements shall be performed to determine the effect of the dielectric withstanding

voltage test on specific operating characteristics, when specified.

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MIL-STD-202-301

5. DETAILED REQUIREMENTS

5.1 Summary. The following details are to be specified in the individual specification:

a. Special preparations or conditions, if required (see 4.2.1).

b. Magnitude of test voltage (see 4.2.2).

(1) Test voltage, and duration for inplant quality conformance testing, if different than for qualification

testing (see 4.2.5).

c. Nature of potential (ac or dc) (see 4.1.1).

d. Duration of application of test voltage for qualification testing if other than 60 seconds (see 4.2.5).

e. Points of application of test voltage (see 4.2.3).

(1) Method of testing specimens with movable parts (see 4.2.5).

f. Method of connection of test voltage to specimen, if significant (see 4.2.3).

g. Regulation, when applicable (see 4.1.1).

h. Minimum kilovolt-ampere rating of high voltage source, if required. (see 4.1.1).

i. Limiting value of surge current, if applicable (see 4.1.1).

j. Maximum leakage current requirement, if applicable (see 4.1.3).

k. Measurements after dielectric withstanding voltage test, if required (see 4.2.6).

6. NOTES

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

6.1 Supersession data. The main body and 38 parts of this revision of MIL-STD-202 replace superseded MIL-STD-

202.

Custodians: Preparing activity:

Army - CR DLA – CC

Navy - EC

Air Force - 85 (Project 59GP-2015-031)

DLA - CC

Review activities:

Army - AR, AT, AV, CR4, MI, SM, TE

Navy - AS, OS, SH

Air Force - 19, 99

NSA - NS

NOTE: The activities listed above were interested in this document as of the date of this document. Since

organizations and responsibilities can change, you should verify the currency of the information above using the

ASSIST Online database at https://assist.dla.mil/

北测（上海）电子科技有限公司

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INCH-POUND

MIL-STD-202-302

18 April 2015

SUPERSEDING

MIL-STD-202G

w/CHANGE 2 (IN PART)

28 June 2013

(see 6.1)

DEPARTMENT OF DEFENSE

TEST METHOD STANDARD

METHOD 302, INSULATION RESISTANCE

AMSC N/A FSC 59GP

北测（上海）电子科技有限公司

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