MIL-STD-202H.pdf - 第267页

MI L - S TD - 202 - 308 F O R E W O R D 1. T his standard is a p pr ov ed f or us e by al l D e par t m ent s a nd A genc i es of t he D e par t m en t of Def ense. 2. T his entire stan dar d has bee n r ev i s ed. T hi …

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INCH-POUND
MIL-STD-202-308
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 308, CURRENT-NOISE TEST FOR FIXED RESISTORS
AMSC N/A FSC 59GP
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MIL-STD-202-308
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.
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北测（上海）电子科技有限公司
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MIL-STD-202-308
CONTENTS
PARAGRAPH PAGE
FOREWORD…………………………………………………………. ii
1. SCOPE 1
1.1 Purpose………………………………………….……..…………. 1
1.2 Precautions……………………………….…….……..…………. 1
1.3 Checks for conflicts………………..……………………………. 1
2. APPLICABLE DOCUMENTS 1
3. DEFINTIONS 2
4. GENERAL REQUIREMENTS 2
4.1 Apparatus……………….…….……..…………….….........……. 2
4.1.1 Test system............................................................................ 2
4.1.1.1 DC measurement considerations…….………………..………. 2
4.1.1.2 AC measurement considerations….…………………..………. 2
4.1.1.3 Calibration technique…………………..…………………….…. 2
4.1.2 Synopsis…….….…….………….………….………...…………. 2
4.2. Procedure…………….………………………..….….………….. 3
4.2.1 Operating conditions………………………..……..……………. 3
4.2.2 Measurements…….……………………………….…………….. 3
4.2.2.1 Calibration….……………………………………….…………….. 3
4.2.2.2 System noise (S)…………………………………..…………….. 5
4.2.2.3 Total noise (T)………....…………………………..…………….. 5
4.2.3 Determination of the "microvolts-per-volt-in-a-decade" index.. 6
4.3 Errors…………………………………………………………….. 6
5. DETAILED REQUIREMENTS 8
5.1 Summary…………………………………………..…..…………. 8
5.2. Examination and measurements…………………………....…. 8
5.2.1 Marking resistance to solvents…….……………..……………. 8
5.2.2 Component protective coating, encapsulation material
and sleeve material resistance….……………..………………. 8
6. NOTES 8
6.1 Supersession data………………………………………………. 8
FIGURES PAGE
1. Block diagram of system …..……………………….……………………… 3
TABLES PAGE
1. Standard operating conditions …..………………….……………….…… 4
2. Correction factor for presence of "system noise".………………….…… 7
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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