1、Designation:B79497(Reapproved 2015)Standard Test Method forDurability Wear Testing of Separable Electrical ConnectorSystems Using Electrical Resistance Measurements1This standard is issued under the fixed designation B794;the number immediately following the designation indicates the year oforiginal
2、 adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the effects of repeated insertionand withdrawal of
3、 separable electrical connectors which areharmful to the electrical performance of the connector.1.2 This test method is limited to electrical connectorsdesigned for use in applications where the current through anyone connection in the connector does not exceed 5 A,andwhere the connector may be sep
4、arated a number of timesduring the life of the connector.1.3 This test method is limited to electrical connectorsintended for use in air ambients where the operating tempera-ture is less than 65C.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are includ
5、ed in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet(MSDS)for this prod
6、uct/materialas provided by the manufacturer,to establish appropriatesafety and health practices,and determine the applicability ofregulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B539 Test Methods for Measuring Resistance of ElectricalConnections(Static Contacts)2.2 Mili
7、tary Standard:3MIL-STD-1344A Test Methods for Electrical Connectors3.Summary of Test Method3.1 Sample connectors are wired for precision resistancemeasurements of each test contact.The samples are dividedinto two groups;then resistance measurements are made ofeach test contact.The connectors in one
8、group undergo anumber of insertion/withdrawal cycles appropriate for theparticular connector under test,and the resistances of theseconnectors are measured again.The connectors in the othergroup are not disturbed.All samples are subjected to anaccelerated aging test;then the resistances are measured
9、 again.All samples are separated(withdrawn),exposed to an acceler-ated aging test in the uninserted condition,removed from thetest,reinserted,and resistances measured again.The variousresistance measurements are compared to detect effects of thewear and aging on electrical performance.4.Significance
10、 and Use4.1 Materials for electrical connector contacts must satisfy anumber of requirements in the areas of electrical,mechanical,and economic characteristics.The stability of electrical prop-erties is one of the most important of these characteristics.Wear of contact surfaces may adversely affect
11、these electricalproperties,especially in designs where the contact surfaces arerelatively thin coatings.This test method provides a means tocompare various material systems on a basis relevant to theirapplication in electrical connector contacts.4.2 Repeated insertion and withdrawal of a connector m
12、aycause wear or other mechanical damage to the electricalcontact surfaces,rendering those surfaces more susceptible toenvironmental degradation.This test method is intended todetect degradation of the electrical properties of the connectorby such processes.4.3 This test method describes procedures f
13、or conductingwear and durability testing of electrical connectors;the proce-dures produce quantitative results.These results may be usedto compare the performance of different connector designs sothat meaningful design choices can be made.Such results mayalso be used to compare the performance of a
14、connector to apreviously established standard to evaluate the quality of thesamples under test.1This test method is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.11 on Electrical Contact Test Methods.Current edition ap
15、proved May 1,2015.Published May 2015.Originallyapproved in 1988.Last previous edition approved in 2009 as B794 97(2009).DOI:10.1520/B0794-97R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volum
16、e information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 The test results obtained from this test method arelimited in their applicability to connector combinations that areequivalent in design and manufacture to those act
