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1、 EIA STANDARD TP-69A Inductance Measurement Test Procedure for Electrical Connectors and Sockets (10 nH 100 nH) EIA-364-69A EIA-364-69A ANSI/EIA-364-69A-2002(R2009) Approved: March 6. 2002 Reaffirmed: February 10, 2009 (Revision of EIA-364-69) MARCH 2002 ELECTRONIC COMPONENTS, ASSEMBLIES resolution:
2、 0.1 nH; test frequency range: appropriate for the value of inductance being measured. See figure 1 for recommended test frequency plot. test frequency accuracy: 0.1%. Copyright Electronic Components, Assemblies a mated contact assembly that would normally be installed in a connector; one-piece conn
3、ectors (e.g. card edge connectors or chip sockets); mated two-piece connectors. 4 Test procedure Unless otherwise specified in the referencing document, the test frequency(s) should be in the recommended area shown in figure 1. The plot identifies the minimum frequency to ensure the minimum 5 ohms i
4、nductive reactance required to minimize measurement error using typical 50 ohm measurement equipment. The test professional should be aware of the limitations and associated accuracy levels when measuring values below 20 nanohenrys. Place the specimen a minimum of 5 cm from any objects that would af
5、fect measured results. 4.1 The inductance of at least three specimens shall be measured unless otherwise specified in the referencing document. In the case of multi-contact connectors, at least three specimens of each type of contact from at least three connector specimens shall be measured unless o
6、therwise specified in the referencing document. For pin and socket contacts the depth of engagement shall be the nominally designed engagement depth unless specified in the referencing document. 4.2 The point of measurement shall be between the termination points of the specimen as shown in figure A
7、.1. 4.3 Adjust the spacing of the test fixture test points to accept the specimen. 4.4 Remove the specimen from the fixture, and in its place insert a round rod of known diameter having a length equal to that of the test sample. The rod diameter should be chosen to yield a calculated value slightly
8、lower than that expected for the specimen. 4.4.1 The reference rod shall remain straight at all times. The calculation of inductance for the reference rod is based on a straight conductor. Copyright Electronic Components, Assemblies see nomograph figure A.2 Correction factor for skin effect () Figur
9、e A.2 Skin effect versus frequency nomograph 1) F.E. Terman, Radio Engineers Handbook, McGraw-Hill, New York, 1943, pages 48 and 49. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009
10、 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA-364-69A Page A-3 A.2.2 Rectangular bar The calculation of the self inductance of a straight rectangular bar is given in footnote 2), page 51. 2) F. W. Grover, Inductance Calculations Working Formulas and Tables,
11、van Nostrand, 1946. Reprinted by Instrument Society of America, 1980, pages 35 and 261. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking pe
12、rmitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA-364-69
13、A Page B-1 B Guidance to determine the self inductance (informative) B.1 The accuracy of inductance measurements below 100 nH is severely limited by the residual inductance of fixturing conductors used to connect the specimen to the test equipment. The conventional technique of using a short copper
14、strip to “zero” an inductance or RLC meter can result in an error of 50% or more. B.2 Residual errors in the instrument used and any changes in the test fixture configuration during the test can significantly affect the measurement results. Uncertainties are minimized by the use of the reference rod
15、. B.3 Care shall be taken in interpreting the measured self inductance of an isolated contact compared to the same contact when it is used in close proximity to other conductors (e.g. ground planes or other contacts). Any conductors or ferro-magnetic materials in close proximity to the measured cont
16、act may introduce error in the measured self inductance. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IH
17、S -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA Document Improvement Proposal If in t
18、he review or use of this document, a potential change is made evident for safety, health or technical reasons, please fill in the appropriate information below and mail or FAX to: Electronic Industries Alliance Technology Strategy & Standards Publications Office 2500 Wilson Blvd. Arlington, VA 22201
19、 FAX: (703) 907-7501 Document No. Document Title: Submitters Name: Telephone No.: FAX No.: e-mail: Address: Urgency of Change: Immediate: At next revision: Problem Area: a. Clause Number and/or Drawing: b. Recommended Changes: c. Reason/Rationale for Recommendation: Additional Remarks: Signature: Da
20、te: FOR EIA USE ONLY Responsible Committee: Chairman: Date comments forwarded to Committee Chairman: Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or
21、networking permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-
22、,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 21:56:49 MDTNo reproduction or networking permitted without license from IHS -,-,-