MIL-STD-202H.pdf - 第240页
MI L - S TD - 202 - 302 6. NOTES (This secti on contain s i n f or m at i on o f a g ener al or ex pl anat or y nat ur e t ha t m ay be he l pf ul , b u t is not man datory.) 6.1 Supers ession data . T he m ai n b ody an…
MIL-STD-202-302
4. GENERAL REQUIREMENTS
4.1. Apparatus. Insulation resistance measurements shall be made on an apparatus suitable for the characteristics
of the component to be measured such as a megohm bridge, megohm-meter, insulation resistance test set, or other
suitable apparatus. Unless otherwise specified, the direct potential applied to the specimen shall be that indicated by
one of the following test condition letters, as specified:
Test condition Test potential
A 100 volts ±10%
B 500 volts ±10%
C 1,000 volts ±10%
For inplant quality conformance testing, any voltage may be used provided it is equal to or greater than the minimum
potential allowed by the applicable test condition. Unless otherwise specified, the measurement error at the
insulation resistance value required shall not exceed 10 percent. Proper guarding techniques shall be used to
prevent erroneous readings due to leakage along undesired paths.
4.2 Procedure. When special preparations or conditions such as special test fixtures, reconnections, grounding,
isolation, low atmospheric pressure, humidity, or immersion in water are required, they shall be specified. Insulation
resistance measurements shall be made between the mutually insulated points or between insulated points and
ground, as specified. When electrification time is a factor, the insulation resistance measurements shall be made
immediately after a 2 minute period of uninterrupted test voltage application, unless otherwise specified. However, if
the instrument reading indicates that an insulation resistance meets the specified limit, and is steady or increasing,
the test may be terminated before the end of the specified period. When more than one measurement is specified,
subsequent measurements of insulation resistance shall be made using the same polarity as the initial
measurements.
5. DETAILED REQUIREMENTS
5.1 Summary. The following details are to be specified in the individual specification:
a. Test condition letter, or other test potential, if required (see 4.1).
b. Special preparations or conditions, if required (see 4.2).
c. Points of measurement (see 4.2).
d. Electrification time, if other than 2 minutes (see 4.2).
e. Measurement error at the insulation resistance value required, if other than 10 percent (see 4.1).
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MIL-STD-202-302
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-2015-032)
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/
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北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
INCH-POUND
MIL-STD-202-303
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 303, DC RESISTANCE
AMSC N/A FSC 59GP
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676