DLA MIL-STD-220 C-2009 METHOD OF INSERTION LOSS MEASUREMENT.pdf
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1、 MIL-STD-220C14 May 2009 SUPERSEDING MIL-STD-220B24 January 2000 DEPARTMENT OF DEFENSE TEST METHOD STANDARD METHOD OF INSERTION LOSS MEASUREMENT AMSC N/A FSC EMCS INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-220C ii FOREWORD 1.
2、This standard is approved for use by all Departments and Agencies of the Department of Defense. 2. This standard specifies a method of measuring the filtering capabilities of passive, low-pass, electromagnetic interference (EMI)/radio-frequency interference (RFI) filters as a function of frequency a
3、nd considering the influence of temperature and direct current bias. This measurement is known as insertion loss (IL). 3. Filters measured by this method are typically feed-through types, having the live conductor(s) passing through the filter providing both input and output terminals protruding fro
4、m and insulated from the case which acts as the ground terminal. These filters typically contain capacitors only or capacitors and inductors, and may also contain resistors or diodes. The filters measured to this standard are normally designed for bulkhead mounting, where the input and output termin
5、als are completely isolated from each other by the bulkhead. 4. The test methods in this standard are intended to provide data for quality control during quantity production of filters. The test methods specified with 50 ohm input and output terminations are satisfactory for this purpose; but do not
6、 represent conditions that exist in actual circuits or installations. In general, there is little correlation between the MIL-STD-220 quality control tests and the performance of a filter in a particular application. This is because power line filters are normally used under conditions where the pow
7、er source and load impedances are independent of each other and can vary widely as a function of frequency. In addition, the power source impedance varies from line to line in general practice. 5. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use
8、in improving this document should be addressed to: Defense Supply Center Columbus, Attn: DSCC-VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to capacitorfilterdscc.dla.mil. Since contact information can change, you may want to verify the currency of this address information using the
9、 ASSIST online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-220C iii CONTENTS PARAGRAPH PAGE FOREWORD ii 1. SCOPE 1 1.1 Scope 1 2. APPLICABLE DOCUMENTS 1 2.1 General 1 2.2 Government documents 1 2.2.1
10、 Specifications, standards, and handbooks 1 2.3 Order of precedence. 1 3. DEFINITIONS. 2 3.1 Insertion loss 2 4. GENERAL REQUIREMENTS. 3 4.1 Test setup 3 4.1.1 Shielding test. 3 4.2 Test equipment . 3 4.2.1 Output signal. 3 4.2.1.1 Measuring a filter. 3 4.2.1.2 Error correction for accurate passband
11、 measurements. 3 4.2.1.3 Sources and types of errors 5 4.2.2 Coaxial lines, connectors, and switches 5 4.2.3 Isolation attenuators. 5 4.2.4 RF-dc insertion loss measuring equipment assembly. 5 4.2.5 Standard attenuator 5 5. METHOD OF TEST 8 5.1 Test conditions 8 5.2 Test procedure 8 5.2.1 Preliminar
12、y operation 8 5.2.2 Method of measurement 8 6. NOTES. 9 6.1 Intended use 9 6.2 Subject term (key word) listing. 9 6.3 Changes from previous issue 9 APPENDIX A - Analysis of Filter Measurements. 10 A.1 Discussion 10 A.1.1 Elements 10 A.1.2 Details 10 A.2 Test condition. 11 Provided by IHSNot for Resa
13、leNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-220C iv CONTENTS - Continued FIGURE PAGE 1. Basic test circuit 4 2. Measuring Filter Insertion Loss 6 3. Insertion loss good ground and good connection to test fixture 7 A-1. Insertion loss good filter and shell ground .
14、11 A-2 Insertion loss poor filter ground to shell 12 A-3 Insertion loss poor filter and fixture ground 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-220C 1 1. SCOPE 1.1 Scope. This standard covers a method of measuring, in a 50 ohm syste
15、m, the insertion loss of feed-through suppression capacitors, and of single and multiple circuit radio frequency (RF) filters at frequencies up to 10 gigahertz (GHz). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, and 5 of this standard. Thi
16、s section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cite
17、d in sections 3, 4, and 5 of this standard, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the is
18、sues of these documents are those listed in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-17 - Cables, Radio Frequency, Flexible and Semi-rigid, General Specification For. MIL-PRF-39012 - Connectors, Coaxial, Radio Frequency, General Specification For. (Copes of these do
19、cuments are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the tex
20、t of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without li
21、cense from IHS-,-,-MIL-STD-220C 2 3. DEFINITIONS 3.1 Insertion loss. At a given frequency, the insertion loss of a feed through suppression capacitor or a filter connected into a given transmission system is defined as the ratio of voltages appearing across the line immediately beyond the point of i
22、nsertion, before and after insertion. As measured herein, insertion loss is represented as the ratio of input voltage required to obtain constant output voltage, with and without the component, in the specified 50 ohm system. This ratio is expressed in decibels (dB) as follows: 21EElog20lossInsertio
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