MIL-STD-202H.pdf - 第96页
MI L - S TD - 202 - 112 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-202-112
TABLE II. Test pressure and duration for condition F.
Test pressure Duration
75 psig .5 hr
60 psig 1.0 hr
30 psig 2.5 hr
15 psig 12.5 hr
TABLE III. Purge time for condition F.
Package with internal
free volume (cm
3
)
Purge time 1/
(seconds)
≤ 0.01
3 1/3-5
>0.01 ≤0.10
6-9
>0.10 8 2/3-13
1/ With purge chamber at 150°C, minimum and maximum
purge times should be reduced by 1/3.
NOTE: If necessary, due to device construction or materials, maximum purge time can be determined by cycling a
device with a 0.02 to 0.05 inch diameter hole and measuring the maximum time that can be used without permitting
the device to escape detection during the test cycle.
4.8. Measurements. Upon completion of the test, measurements shall be made as specified.
5. DETAILED REQUIREMENTS
5.1 Summary. The following details are to be specified in the individual specification.
a. Test condition letter (see 4.1.1).
(1) For test condition C.
(a) Procedure number and accept and reject leak rate.
(b) Backfilling pressure when verification of seal is required (see 4.4.3, 4.4.4.1 and .4.4.2).
(c) Number of pressure cycles if applicable (see 4.4.4.2).
(d) For procedure IV.
1. Reduced pressure of the chamber and duration of pressurization (see 4.4.4.4).
2. Whether perforation of specimen is required (see 4.4.4.4).
(e) For procedures III and IV.
1. Applicable gross leak conditions.
(2) For test conditions D and E.
(a) Test mounting fixtures (see 4.5.4 and 4.6.4).
1. Measurements after test (see 4.8).
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MIL-STD-202-112
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 The main body and 38 parts of this revision of MIL-STD-202 replace superseded MIL-STD-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-2015-016)
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-202-201
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 201, VIBRATION
AMSC N/A FSC 59GP
北测（上海）电子科技有限公司
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