MIL-STD-202H.pdf - 第192页

MI L - S TD - 202 -2 1 3 CO NT E N T S PARAGRAPH PAG E FOREW ORD … ………………………………………………………. ii 1. SCOPE 1 1.1 Purpose …… ………………… …………………. …… .. …………. 1 2. APPLICABLE D O C U M EN T S 1 2.1 Non - Govern m e nt pu bl i c at …

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MIL-STD-202-213
FOREWORD
1. This standard is approved for use by all Departments and Agencies of the Department of Defense.
2. This entire standard has been revised. This revision has resulted in many changes to the format, but the most
significant one is the splitting the document into test methods. See MIL-STD-202 for the change summary.
3. Comments, suggestions, or questions on this document should be emailed to std202@dla.mil or addressed to:
Commander, Defense Logistics Agency, DLA Land and Maritime, ATTN: VAT, P.O. Box 3990, Columbus, OH
43218–3990. Since contact information can change, you may want to verify the currency of this address
information using the ASSIST Online database at https://assist.dla.mil.
ii
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MIL-STD-202-213
CONTENTS
PARAGRAPH PAGE
FOREWORD…………………………………………………………. ii
1. SCOPE 1
1.1 Purpose………………………………………….……..…………. 1
2. APPLICABLE DOCUMENTS 1
2.1 Non-Government publications…………………………………. 1
3. DEFINTIONS 1
4. GENERAL REQUIREMENTS 1
4.1 Apparatus………………………………………….….........……. 1
4.1.1 Shock machine....................................................................... 1
4.1.1.1 Shock machine calibration …….............................................. 1
4.1.2 Instrumentation………….………………….………...…………. 1
4.1.2.1 Frequency response..………………..…….………...…………. 1
4.1.2.1.1 Frequency response measurement of the
complete instrumentation………..…..…….………...…………. 2
4.1.2.1.2 Frequency response measurement of auxiliary equipment.... 2
4.1.2.2 Transducer………..…..…….……….........................…………. 5
4.1.2.3 Transducer calibration………..................................…………. 5
4.1.2.4 Linearity………........................................................…………. 5
4.1.2.5 Transducer mounting……………………………………………. 5
4.1.3 Application of shock measuring instrumentation…………….. 5
4.2. Shock pulses …………………………..….….…………………. 5
4.2.1 Half-sine shock pulse……………..….…………………………. 5
4.2.1.1 The ideal half-sine pulse………..….………………..…………. 5
4.2.2 Sawtooth shock pulse…..….…………….…………..…………. 5
4.2.2.1 The ideal terminal-peak sawtooth…….…………..……………. 5
4.3. Procedure………………………………………..……..…………. 6
4.3.1 Basic design test ….…………….………………………………. 6
5. DETAILED REQUIREMENTS 7
5.1 Measurements …………………………………..………………. 7
5.2. Summary …………………..……………………..…..…………. 7
6. NOTES 7
6.1 Supersession data………………………………………………. 7
6.2 Cancelled Method …………………………………………….…. 7
FIGURES PAGE
1. Tolerances for half sine shock pulse………………………………….….. 2
2. Tolerances for terminal-peak sawtooth shock pulse. ……………….….. 3
3. Tolerance limits for measuring system frequency response…………… 4
TABLES PAGE
1. Test condition values………………………………………………….…… 6
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MIL-STD-202-213
METHOD 213
SHOCK (SPECIFIED PULSE)
1. SCOPE
1.1 Purpose. This test is conducted for the purpose of determining the suitability of component parts and
subassemblies of electrical and electronic components when subjected to shocks such as those which may be
expected as a result of rough handling, transportation and military operations. This test differs from other shock tests
in this standard in that the design of the shock machine is not specified, but the half-sine and sawtooth shock pulse
waveforms are specified with tolerances. The frequency response of the measuring system is also specified with
tolerances.
2. APPLICABLE DOCUMENTS
2.1 Non-Government publications. The following documents form a part of this document to the extent specified
herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.
ACOUSTICAL SOCIETY OF AMERICA (ASA)
ASA S2.2 - Methods for the Calibration of Shock and Vibration Pickups
(Copies of this document are available online at http://asa.aip.org)
3. DEFINTIONS
This section not applicable to this standard.
4. GENERAL REQUIREMENTS
4.1. Apparatus.
4.1.1 Shock machine. The shock machine utilized shall be capable of producing the specified input shock pulse as
shown on figures 1 or 2, as applicable. The shock machine may be of the free fall, resilient rebound, nonresilient,
hydraulic, compressed gas, or other activating types.
4.1.1.1 Shock machine calibration. The actual test item, or a dummy load which may be either a rejected item or a
rigid dummy mass, may be used to calibrate the shock machine. (When a rigid dummy mass is used, it shall have
the same center of gravity and the same mass as that of the test item and shall be installed in a manner similar to
that intended for the test item.) The shock machine shall then be calibrated for conformance with the specified
waveform. Two consecutive shock applications to the calibration load shall produce waveforms which fall within the
tolerance envelope given on figures 1 or 2. The calibration load shall then be removed and the shock test performed
on the actual test item. If all conditions remain the same, other than the substitution of the test item for the calibration
load, the calibration shall then be considered to have met the requirements of the waveform.
NOTE: It is not implied that the waveform generated by the shock machine will be the same when the actual test
item is used instead of the calibration load. However, the resulting waveform is considered satisfactory if the
waveform with the calibration load was satisfactory.
4.1.2 Instrumentation. In order to meet the tolerance requirements of the test procedure, the instrumentation used
to measure the input shock shall have the characteristics specified in the following paragraphs.
4.1.2.1 Frequency response. The frequency response of the complete measuring system, including the transducer
through the readout instrument, shall be as specified by figure 3.
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