ASTM_F_2073_-_14.pdf

Designation:F207314Standard Test Method forNon-Destructive Short Circuit Testing of a MembraneSwitch1This standard is issued under the fixed designation F2073;the number immediately following the designation indicates the year oforiginal 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 standard establishes a test method for detectingunwanted electrical shorts in a membrane switch.1.2 Since this is a non-destructive test,it can be performedon a membrane switch that is going to be mounted and used inits intended environment.1.3 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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Terminology2.1 Definitions:2.1.1 shortunwanted electrical connection between twotest points having a resistance lower than the specified opencircuit resistance.2.1.2 membrane switcha momentary switching device inwhich at least one contact is on,or made of,a flexiblesubstrate.2.1.3 specified open circuit resistanceminimum allowableresistance as measured between two test points that,if lowerthan,will indicate an electrical short.2.1.4 test pointan electrical input or outpoint connectionon the membrane switch.3.Significance and Use3.1 Destructive and non-destructive tests characteristicsmust be evaluated to ensure the membrane switch will operateand survive the application it was designed for.It is not feasiblefor all tests to be performed on each membrane of a productionlot.However,there are some non-destructive tests that must beperformed on each switch assembly to ensure 100%function-ality and checking each i/o point for unwanted electricalcontinuity to any other i/o point is one of these characteristics.4.Apparatus4.1 Electrical Tester,capable of measuring the electricalresistance between two test points.4.1.1 Electrical Tester must be capable of detecting a shortwhen a resistance is measured between any of the test pointsthat is less than the specified open circuit resistance.4.1.2 Since this is a non-destructive test,the applied voltageshould not exceed the specified voltage selected appropriately.5.Procedure5.1 Pretest Setup:5.1.1 Connect test points of the switch assembly to theElectrical Tester.5.1.2 Adjust test voltage source as necessary.5.1.3 Adjust threshold resistance to the specified opencircuit resistance.5.2 In-Process Test:5.2.1 Test first test point for shorts between all other testpoints and record results.5.2.2 Test second test point for shorts between all other testpoints and record results.5.2.3 Repeat until all test points are checked between allother test points.6.Report6.1 Report the following information:6.1.1 Specified voltage,6.1.2 Specified shorts resistance,6.1.3 Shorts found,6.1.4 Test points associated with each short,and6.1.5 Resistance value of each short.7.Keywords7.1 electrical short;insulation resistance;membrane switch;open circuit;resistance;short circuit;switch short1This guide is under the jurisdiction of ASTM Committee F01 on Electronicsand is the direct responsibility of Subcommittee F01.18 on Membrane Switches.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 2000.Last previous edition approved in 2006 as F207301(2006).DOI:10.1520/F2073-14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585(phone),610-832-9555(fax),or serviceastm.org(e-mail);or through the ASTM website(www.astm.org).Permission rights to photocopy the standar