1、Designation: F2188 02 (Reapproved 2011)Standard Test Method forDetermining the Effect of Variable Frequency Vibration on aMembrane Switch or Membrane Switch Assembly1This standard is issued under the fixed designation F2188; the number immediately following the designation indicates the year oforigi
2、nal 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 establishes procedures for determiningthe effec
3、t of sinusoidal vibration, within the specified fre-quency range, on switch contacts, mounting hardware, adheredcomponent parts, solder or heat stakes, tactile devices, andcable or ribbon interconnects associated with a membraneswitch or membrane switch assembly.1.2 This standard does not purport to
4、 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 contact closuret
5、he event at which a specified resis-tance is achieved on a membrane switch.2.1.2 critical resonance frequencyany point on the speci-men that is observed to have maximum amplitude or more thantwice that of the base input amplitude or support points.2.1.3 membrane switcha momentary switching device in
6、which at least one contact is on, or made of, a flexiblesubstrate.2.1.4 specified resistancemaximum allowable circuit re-sistance as measured between two test points whose internalcontacts, when held closed, complete a circuit.2.1.5 test pointstwo pre-selected conductive points in acircuit loop, pos
7、sibly including a switch.3. Significance and Use3.1 Vibration encountered in the field is not usually simpleharmonic.3.2 This test can be used to determine relative motionbetween parts, critical frequencies, adhesion strengths, loosen-ing of parts or other physical effects that can cause fatigue orf
8、ailure.3.3 Experience has shown that this test will expose potentialfailures associated with the electronic components of a mem-brane switch, where 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
9、potentially destructive, intended for devicequalification.3.6 Either Test Condition A or B can be chosen, based uponthe intent of the test determined by the qualified engineer.4. Apparatus4.1 Vibration Fixture, capable of holding the unit under testand subjecting it to the specified random frequency
10、 andduration as described in the In-Process Test.4.2 Contact Closure Detection Device, (if test is performedunder load conditions), instrumentation capable of resolving aswitch opening time of greater than or equal to 1.0 ms.4.3 Resonant Detecting Instrumentation, (if determinationof critical resona
11、nce frequency is desired), capable of deter-mining the critical resonance frequency.5. ProcedureTest Condition A, 10 g5.1 Pre-Test Setup:5.1.1 Secure membrane switch on vibration test surfacewith appropriate fixturing.5.1.2 Connect switch detection leads to test points on themembrane switch (if cont
12、act closure is being monitored duringthe test).5.1.3 Function testing to be specified and performed againafter test completion for comparison.5.2 In-Process Test:5.2.1 Subject test unit to sinusoidal vibration varied infrequency from 10 to 500 Hz at a logarithmic rate of 0.5 octaveper minute for a d
13、uration of 18 cycles per each orthogonal axis(total of 56 times). The amplitude of the vibration shall be1This test method is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.18 on MembraneSwitches.Current edition approved Feb. 1, 2011.
14、Published March 2011. Originallyapproved in 2002. Last previous edition approved in 2002 as D2188 - 02. DOI:10.1520/F2188-02R11.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.either 0.06-in. double inch amplitude or 10 gravities (g-
15、peak),whichever is less. The tolerance for the vibration profile is63dB.5.2.2 Visual inspection shall be conducted after each axis ofvibration.5.2.3 Electrical and functional testing shall be specified bythe qualified engineer and performed at either test completionor between each axis of vibration.
16、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 occurs during vibration and or electrical or otherfunctional testing provides unsatisfactory results.6. Pr
17、ocedureTest Condition B, 20 g6.1 Pre-Test Setup:6.1.1 Secure membrane switch on vibration test surfacewith appropriate fixturing.6.1.2 Connect switch detection leads to test points on themembrane switch (if contact closure is being monitored duringtest).6.1.3 Function testing to be specified and per
18、formed againafter test completion for comparison.6.2 In-Process Test:6.2.1 Subject test unit to sinusoidal vibration varied infrequency from 10 to 500 Hz at a logarithmic rate of 0.5 octaveper minute for a duration of 18 cycles per each orthogonal axis(total of 56 times). The amplitude of the vibrat
19、ion shall beeither 0.06-in. double inch amplitude or 20 gravities (g-peak),whichever is less. The tolerance for the vibration profile is63dB.6.2.2 Visual inspection shall be conducted after each axis ofvibration.6.2.3 Electrical and functional testing shall be specified bythe qualified engineer and
20、performed at either test completionor between each axis of vibration.6.2.4 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 occurs during vibration and or electr
21、ical or otherfunctional testing provides unsatisfactory results.7. Report7.1 Report the following information:7.1.1 Description of vibration equipment used,7.1.2 Description of mounting fixture including drawing,diagrams, and photos as necessary,7.1.3 Functional testing results before and after test
22、,7.1.4 Describe Test Condition used, either A or B,7.1.5 Description of the visual fatigue of any components orhardware,7.1.6 Contact closure event (if monitored), when occurredand axis being tested,7.1.7 Temperature,7.1.8 Relative humidity,7.1.9 Barometric pressure,7.1.10 Part number or description
23、 of switch, or both, and7.1.11 Date of test.8. Keywords8.1 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 advi
24、sed 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
25、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
26、 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. Individ
27、ual 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 standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F2188 02 (2011)2
