1、Designation: F 2187 02Standard Test Method forDetermining the Effect of Random Frequency Vibration on aMembrane Switch or Membrane Switch Assembly1This standard is issued under the fixed designation F 2187; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method establishes procedures for determiningthe effect of random vibra
3、tion, within the specified frequencyrange, on switch contacts, mounting hardware, adhered com-ponent parts, solder or heat stakes, tactile devices, and cable orribbon interconnects associated with a membrane switch ormembrane switch assembly.2. Terminology2.1 Definitions:2.1.1 contact closurethe eve
4、nt at which a specified resis-tance is achieved on a membrane switch.2.1.2 membrane switcha momentary switching device inwhich at least one contact is on, or made of, a flexiblesubstrate.2.1.3 specified resistancemaximum allowable circuit re-sistance as measured between two test points whose interna
5、lcontacts, when held closed, complete a circuit.2.1.4 test pointstwo pre-selected conductive points in acircuit loop, possibly including a switch.3. Significance and Use3.1 Vibration encountered in the field is usually random innature and this test can be used to determine the effects ofrandom excit
6、ation on the membrane switch.3.2 Random vibration can cause mechanical fatigue andfailure by switch components either loosening or otherwisechanging over time.3.3 Experience has shown that this test will expose potentialfailures associated with the electronic components of a mem-brane switch, where
7、tests of lower levels will not.3.4 This practice can be used to qualify a membrane switchfor aerospace, medical and other applications.3.5 This test is potentially destructive, intended for devicequalification.4. Apparatus4.1 Vibration Fixture, capable of holding the unit under testand subjecting it
8、 to the specified random frequency andduration as described in the In-Process Test.4.2 Contact Closure Detection Device, instrumentation ca-pable of resolving a switch opening time of greater than orequal to 1.0 ms.5. Procedure5.1 Pre-Test Setup:5.1.1 Secure membrane switch on vibration test surface
9、with appropriate fixturing.5.1.2 Function testing to be specified and performed againafter test completion for comparison.5.1.3 Connect switch detection leads to test points on themembrane switch.5.2 In-Process Test:5.2.1 Subject to a random vibration over the bandwidth of10 to 2000 for a duration o
10、f 1 h per each orthogonal axis (totalof 3 h). The break points shall be as follows:NOTE 1The tolerance shall be 63db for this test.Frequency G2/Hz40 0.042000 0.04Overall GRMS 8.855.2.2 Visual inspection shall be conducted after each axis ofvibration.5.2.3 Electrical and functional testing shall be s
11、pecified bythe qualified engineer and performed at either test completionor between each axis of vibration.5.2.4 A failure shall occur if parts show signs of mechanicalfatigue, cracking, excessive rubbing or loosening of the sup-porting hardware. A failure should also be designated if contactclosure
12、 occurs during vibration and or electrical or otherfunctional testing provides unsatisfactory results.6. Report6.1 Report the following information:6.1.1 Description of vibration equipment used,6.1.2 Description of mounting fixture including drawing,diagrams, and photos as necessary,6.1.3 Functional
13、 testing results before and after test,6.1.4 Description of the visual fatigue of any components orhardware,6.1.5 Contact closure event; when occurred and axis beingtested,1This test method is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee
14、 F01.18 on MembraneSwitches.Current edition approved May 10, 2002. Published July 2002.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.1.6 Temperature,6.1.7 Relative humidity,6.1.8 Barometric pressure,6.1.9 Part number or descripti
15、on of switch, or both, and6.1.10 Date of test.7. Keywords7.1 contact closure; frequency; membrane switch; vibrationASTM 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 ad
16、vised 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, eithe
17、r 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.
18、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).F 21872
