MIL-STD-202H.pdf - 第80页

MI L - S TD - 202 - 112 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 3. DEFINTIONS 1 3.1 Standard le a k r …

100%1 / 305
MIL-STD-202-112
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
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-112
CONTENTS
PARAGRAPH PAGE
FOREWORD…………………………………………………………. ii
1. SCOPE 1
1.1 Purpose………………………………………….……..…………. 1
2. APPLICABLE DOCUMENTS 1
3. DEFINTIONS 1
3.1 Standard leak rate..………………………….……..……………. 1
3.2 Measured leak rate………………………….……..……………. 1
3.3 Equivalent standard leak rate..…………….……...……………. 1
3.4 Sensitivity.…………………………………….……..……………. 1
3.5 Ambient background…………………………………………….. 1
4. GENERAL REQUIREMENTS 2
4.1 Test Conditions.………………………………….…...………….. 2
4.1.1 Selection.........................................................................……. 2
4.1.2 Substitution………………………………….………...…………. 3
4.2. Test Condition A………..…………………….…………………. 3
4.2.1 Materials………………………………………………………...... 3
4.2.1.1 Mineral oil or peanut oil……………………..………………...... 3
4.2.2 Apparatus………………………………………………………… 3
4.2.2.1 Heated oil container………..………………..………………...... 3
4.2.3 Precautions……………………....…………..………………...... 3
4.2.4 Preparation of specimens………………………………………. 3
4.2.5 Procedure…………………………………..…………………….. 3
4.3 Test Condition B………..…………………….…………………. 4
4.3.1 Materials………………………………………………………...... 4
4.3.1.1 Silicone oil………………………………………………………… 4
4.3.2 Apparatus……………………………………………….……...... 4
4.3.2.1 Reduced pressure vessel…….……………………….……...... 4
4.3.2.2 Vacuum pump……………………………………………………. 4
4.3.2.3 Degassing of silicone oil…………..……………………………. 4
4.3.3 Preparation of specimens………..……………………..………. 4
4.3.4 Procedure…………………………………………………………. 4
4.3.5 Precaution……………………………………………..…………. 4
4.4 Test Condition C………..…………………….…………………. 4
4.4.1 Materials………………………………………………………...... 4
4.4.1 Materials………………………………………………………...... 4
4.4.1.1 Tracer gases…………………....……………………………...... 4
4.4.2 Apparatus……………………………………………….……...... 4
4.4.2.1 Mass-spectrometer-type leak detector…………….………….. 5
4.4.2.1.1 Chambers……………………………………………….……...... 5
4.4.2.1.2 Pumps……………………………………………….……..…...... 5
4.4.2.2 Radioactive-gas detection apparatus…………….……..…...... 5
4.4.3 Supplementary tests……………………………….……..…...... 5
4.4.4 Procedures………………………………………….……..…...... 5
4.4.4.1 Procedure I………………………………………….……..…...... 5
4.4.4.2 Procedure II…………………..…………………….……..…...... 6
iii
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676
MIL-STD-202-112
CONTENTS (continued)
PARAGRAPH PAGE
4.4.4.3 Procedure III…………………..…………………….……..…...... 6
4.4.4.3.1 Testing precautions………..……………………….……..…...... 6
4.4.4.3.2 General procedure………..…………….………….……..…...... 6
4.4.4.3.2.1 Procedure IIIa……………..…………….………….……..…...... 6
4.4.4.3.2.2 Procedure IIIb……………..…………….………….……..…...... 7
4.4.4.3.2.2.1 Activation parameters…….…………….………….……..…...... 7
4.4.4.3.2.2.2 Determination of counting efficiency (k)………..……..…...... 7
4.4.4.3.2.2.3 Evaluation of surface sorption..………………………..…...... 7
4.4.4.3.2.2.4 Specific procedure IIIb…………………………………..…...... 8
4.4.4.3.2.2.5 Personnel precautions…………………………………..…...... 8
4.4.4.3.2.3 Procedure IIIc……………………………..…............................ 9
4.4.4.4 Procedure IV…………………………..…..…............................ 9
4.5 Test Condition D………..…………………….…………………. 9
4.5.1 Materials……..…………………….…………………………..…. 9
4.5.1.1 Fluorocarbon liquid…………….……………………………..…. 9
4.5.2 Apparatus……….……………………………………………..…. 9
4.5.2.1 Heated fluid container………………………………………..…. 9
4.5.2.2 Filter…………………………………………………………….…. 10
4.5.2.3 Magnifier……………………………………………………….…. 10
4.5.3 Precautions…………………………………………………….…. 10
4.5.4 Procedure……………………………………..……………….…. 10
4.6 Test Condition E………..…………………….…………………. 10
4.6.1 Materials……..…………………….…………………………..…. 9
4.6.1.1 Fluorocarbon liquid…………….……………………………..…. 9
4.6.2 Apparatus……….……………………………………………..…. 9
4.6.2.1 Heated fluid container………………………………………..…. 9
4.6.2.2 Filter…………………………………………………………….…. 9
4.6.2.3 Magnifier……………………………………………………….…. 10
4.6.2.4 Chamber……………………………………………………….…. 10
4.6.2.5 Lighting source………….…………………………………….…. 11
4.6.2.6 Instruments…..………….…………………………………….…. 11
4.6.2.7 Fixtures……….………….…………………………………….…. 11
4.6.3 Precautions…………………………………………………….…. 11
4.6.4 Procedure……………………………………..……………….…. 11
4.7 Test Condition F………..…………………….…………….……. 11
4.7.1 Materials……..…………………….…………………………..…. 11
4.7.1.1 Fluorocarbon liquid…………….……………………………..…. 11
4.7.2 Apparatus……….……………………………………………..…. 12
4.7.2.1 Chamber ………………………….…………………………..…. 12
4.7.2.2 Filter…………………………………………………………….…. 12
4.7.2.3 Detector………………………………………………….…….…. 12
4.7.2.4 Instruments..…………………………………………………..…. 12
4.7.3 Precautions…………………………………………………….…. 12
4.7.4 Procedure……………………………………..……………….…. 12
4.7.4.1 Failure criteria………………………………………………….…. 12
4.8 Measurements……………………………………………..….…. 13
5. DETAILED REQUIREMENTS……………………………………...… 13
5.1 Summary………..………………………………………………… 13
iv
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676