MIL-STD-202H.pdf - 第299页
MI L - S TD - 202 -3 11 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-202-311
4.1.2 Monitoring apparatus. The monitoring apparatus shall be capable of indicating resistances greater than a
particular value, as specified. Care should be exercised so as to minimize any loading effects by the monitoring
apparatus such as current surges as a result of shunt capacitance of shield wire or instrumentation current to the
monitoring indicator. During each closure, the contact potential shall be monitored for at least 50 percent of the time
contacts are closed. The apparatus shall provide and record, either manually or automatically, the following
information:
a. Number of contact closures with contact load applied.
b. If required, number of times the contacts have performed as specified prior to the first failure to perform as
specified.
c. Number of times the contacts have failed to perform as specified, i.e., the number of "misses".
d. Sticking of contacts, when in the "open" condition, unless otherwise specified. Sticking of contacts shall be
defined as failure to reach 90 percent of the open-circuit voltage.
4.2. Procedure. Each pair of contacts shall be operated for the number of cycles specified at the specified cycling
rate with the required test load (see 4.1) applied. The contact resistance shall be continuously monitored using the
apparatus in 4.1.1 and 4.1.2.
5. DETAILED REQUIREMENTS
5.1. Summary. The following details are to be specified in the individual specification:
a. If applicable, specify environment, e.g., temperature, humidity, pressure, composition of atmosphere, and
any other special environmental conditions (see 1).
b. Number of "misses" allowed which will be considered a failure (see 4.1).
c. Maximum contact resistance allowed (see 4.1.1).
d. If monitoring of contacts for sticking is not applicable (see 4.1.2).
e. Number of cycles of operation and cycling rate (see 4.2).
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MIL-STD-202-311
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 The main body and 38 parts of this revision of MIL-STD-202 replace superseded MIL-STD-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-2015-041)
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
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INCH-POUND
MIL-STD-202-312
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 312, LIFE, INTERMEDIATE CURRENT SWITCHING
AMSC N/A FSC 59GP
北测（上海）电子科技有限公司
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