MIL-STD-202H.pdf - 第199页

MI L - S TD - 202 -2 1 3 5. DETAILED REQUI RE M E N T S 5.1 Measure ments . M eas ur e m ent s ar e t o be m ade bef or e and af t er t he r e qui r ed n um b er of shocks unl ess otherwise spe cified, and dur i n g t he…

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MIL-STD-202-213
4.3. Procedure. The test specimen shall be mounted as specified in the component specification. Whenever
possible, the test load shall be distributed uniformly on the test platform in order to minimize the effects of unbalanced
loads.
4.3.1 Basic design test. Three shocks in each direction shall be applied along the three mutually perpendicular
axes of the test specimen (18 shocks). If the test specimen is normally mounted on vibration isolators, the isolators
shall be functional during the test. The specified test pulse (half-sine or sawtooth pulse) shall be in accordance with
figures 1 and 2, respectively, and shall have a duration and peak value in accordance with one of the test conditions
of table 1.
TABLE 1. Test condition values.
Test
condition
Peak value
(g’s)
Normal
duration (D) (ms)
Waveform
Velocity
change (V
i
) ft/sec
A
B
C
D
E
F
G
H
I
J
K
50
75
100
500
1,000
1,500
50
75
100
30
30
11
6
6
1
0.5
0.5
11
6
6
11
11
Half-sine
Half-sine
Half-sine
Half-sine 1/ 2/ 3/
Half-sine 1/ 2/ 3/
Half-sine 1/ 2/ 3/
Sawtooth 2/
Sawtooth 2/
Sawtooth 2/
Half-sine
Sawtooth
11.3
9.2
12.3
10.2
10.2
15.4
8.8
7.2
9.7
6.8
5.3
1/ For half-sine shock pulses of less than 3 milliseconds duration, it is not required that the envelope
fall within the tolerances specified on figure 1. The faired amplitude of the measured pulse shall be
within ±20 percent of the ideal amplitude. The measured duration shall be within ±15 percent of the
specified amplitude duration. The velocity change of the faired measured pulse shall be within ±10
percent of the ideal pulse. The duration of the pulse shall be measured at the 0.1A point on the
pulse. The duration of the pulse shall be the duration measured at the 0.1A point divided by .94.
Test conditions D, E, and F are principally applicable to semiconductors.
2/ Test conditions G, H, and I (sawtooth) waveforms are preferred, except for semi- conductors, for
which test conditions D, E, and F (half-sine) are preferred.
3/ For test condition D. Where the weight of multi-specimen and fixtures exceeds 150 pounds, there
is a question as to whether the shock pulse is properly transmitted to all specimens. Due
consideration should be given to the design of the test fixture to assure the proper shock input to
each specimen. This also applies to test conditions E and F except that where the weight of the
multi-specimen and fixtures exceeds 25 pounds.
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MIL-STD-202-213
5. DETAILED REQUIREMENTS
5.1 Measurements. Measurements are to be made before and after the required number of shocks unless
otherwise specified, and during the test if specified.
5.2 Summary. The following details are to be specified in the individual specification:
a. Mounting method and accessories (see 4.1.2.5 and 4.3).
b. Test condition letter (see 4.3.1).
c. Measurements before, during, and after the test (see 5.1).
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.
6.2 Cancelled Method. 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)
Custodians: Preparing activity:
Army - CR DLA – CC
Navy - EC
Air Force - 85 (Project 59GP-2015-027)
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-202-214
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 214, RANDOM VIBRATION
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