ASTM F1578-2001 Standard Practice for Contact Closure Cycling of a Membrane Switch《薄膜开关接触闭合循环的标准实施规程》.pdf

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1、Designation: F 1578 01Standard Practice forContact Closure Cycling of a Membrane Switch1This standard is issued under the fixed designation F 1578; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number

2、 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 practice covers the setup, procedure, and apparatusrequired to depress and release a membrane switch to apredetermined number of cycles

3、.1.2 This practice also covers the optional use of specifiedvoltage and current during the cycling of the membrane switch.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-

4、priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 2240 Test Method for Rubber PropertyDurometerHardnessF 1597 Test Method for Determining the Actuation Forceand Contact Force of a Membrane Switch3.

5、Terminology3.1 Definitions:3.1.1 actuation forcethe maximum force measured priorto or including the point at which contact closure is achievedon a membrane switch.3.1.2 contact closurethe event at which a specified resis-tance is achieved.3.1.3 contact forcethe force at contact closure.3.1.4 duratio

6、nthe number of depressions and releasecycles.3.1.5 duty cyclethe ratio of switch closed time to totalcycle time.3.1.6 specified resistancemaximum allowable resistanceas measured between two terminations whose internal switchcontacts are held closed to complete a circuit.3.1.7 test ratethe number of

7、depressions and releasecycles per second.3.1.8 membrane switcha momentary switching device inwhich at least one contact is on, or made of, a flexiblesubstrate.4. Significance and Use4.1 Contact closure cycling is useful to manufacturers andusers for determining the effect of repeated closing of swit

8、chcontacts or the effect of repeated flexure of other switchcomponents.4.2 The characteristic(s) are measured before cycling beginsand then again after cycling ends.5. Apparatus5.1 Suitable Electronic Monitoring Device, to detect andcount contact closure at a specified test rate and duty cycle.5.2 S

9、urface, flat, smooth, unyielding, and larger than theswitch.5.3 Test Probes, built to either of the configurations shownin Fig. 1 or Fig. 2, are acceptable but must be made of an inertelastomeric material with a hardness number equivalent toA/45 65 as measured in accordance with Test Method D 2240.T

10、est probes that do not meet this criteria must be specified andrecorded fully.5.4 Device, which will cycle the probe repeatedly into andaway from the switch at a specified test rate and duty cycle, andwhich is capable of providing means for counting probe cycles.The motion of the probe should be per

11、pendicular to the planeof the switch.5.5 Power Supply, capable of supplying specified voltage orcurrent, or both, if required.6. Procedure6.1 Pretest Setup:6.1.1 Secure the switch on a test table.6.1.2 Measure the desired characteristics of the switch sothat comparable measurements can be made durin

12、g or after thetest.6.1.2.1 Document the procedure and test equipment used tomeasure the characteristics.6.1.3 Determine the actuation force (Fa). (See Test MethodF 1597.)6.1.4 Position the test probe over the desired area of theswitch.1This practice is under the jurisdiction of ASTM Committee F01 on

13、 Electronicsand is the direct responsibility of Subcommittee F01.18 on Membrane Switches.Current edition approved June 10, 2001. Published August 2001. Originallypublished as F 1578 95. Last previous edition F 1578 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS

14、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.1.5 Connect the switch ter

15、minations to the contact closuremonitoring device, and power supply, if applicable.6.1.6 Adjust the probe in the full-down position to achieve110 % of actuation force (Fa) or to a specified force.6.1.7 Set the power supply voltage or current, or both, to thespecified values, if applicable.6.2 In-Pro

16、cess Test:6.2.1 Begin cycling at specified test rate and duty cycle.6.2.2 Measure the characteristics of the switch at desiredintervals as performed in 6.1.2.NOTE 1If switch removal from the test table is necessary, return theswitch to the exact location.6.3 End test:6.3.1 Stop the test at a presele

17、cted duration or at the point offailure.6.3.2 Measure the final characteristics using the samemethod, equipment, and conditions as used in the pretest setupdescribed in 6.1.2.7. Keywords7.1 contact closure cycling; membrane switchASTM International takes no position respecting the validity of any pa

18、tent 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 revisio

19、n 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 com

20、ments 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 copyright

21、ed 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).FIG. 1 Test Probe OptionFIG. 2 Test Probe OptionF 1578 012