MIL-STD-202H.pdf - 第81页

MI L - S TD - 202 - 112 C O N T E N T S ( c ont i nued) PARAGRAPH PAG E 4.4.4.3 Procedure III …………………. . ……………………. ……. . …. . . . . . 6 4.4.4.3.1 Testing pre c aut i ons ……… . . … ……………………. ……. . …. . . . . . 6 4.4.4.3.2…

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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
MIL-STD-202-112
CONTENTS (continued)
PARAGRAPH PAGE
6 NOTES………………………………………………….………………. 14
6.1 Suppression data…………………………….………………………… 14
TABLE PAGE
I. Fixed conditions procedure IIIa…………………….………………....…… 6
II. Test pressure and duration for condition F……………………………….. 13
III. Purge time for condition F………………………………………….....…… 13
v
北测（上海）电子科技有限公司
联系方式：xuyj@beice-sh.com 13917165676