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Designation:F2112−02(Reapproved2011)
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Standard Terminology for
Membrane Switches1
This standard is issued under thefixed designation F2112;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(´)indicates an editorial change since the last revision or reapproval.
1.Scope
1.1This terminology defines terms that are commonly ud in the membrane switch industry.fieldt
ias1.2The definitions are not mutually exclusive.
2.Terminology
actuation force—the maximum force measured prior to or including point at which contact closure is achieved on a membrane switch.
bend—to force from a straight form into different and espe-cially a curved one.
bend cycle—a fold of a sample around a specified mandrel which is“rolled”in one direction,followed by rolling in the opposite direction,returning the sample to its original position.
circuit resistance—electrical resistance as measured between two test points who internal contacts,when held clod, complete a circuit.
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conductor resistance—the measured electrical resistance through a circuit loop between two test points.
contact bounce—intermittent contact opening and contact closure that may occur after switch operation.
contact closure—the event at which a specified resistance is achieved on a membrane switch.
菅义伟竞选ldp总裁contact force—the force at contact closure.
crea—a ridge or groove made by folding and pressing. crea cycle—a180degree crea followed by aflattening of the crea.
current carrying capacity—the maximum level of electrical current that a circuit can conduct without sustaining damage.dielectric withstand voltage—the maximum voltage a dielec-tric can withstand in a membrane switch without a visual change from a voltage discharge or specified change of insulation resistance,or both.
duty cycle—the ratio of switch clod time to total cycle time. graphic layer—optional decorated layer of a membrane switch.See Fig.1.
insulation resistance—the electrical resistance between two isolated test points on a membrane switch.
leakage current—currentflow through the insulation between test points.
membrane layer—aflexible dynamic layer which carries one or both switch poles the deflection of which is ud to short both poles together.The membrane layer is a required component of a membrane switch.See Fig.1. membrane switch—a momentary switching device in which at least one contact is on,or made of,aflexible substrate. membrane switchflex tail—flexible portion of a membrane switch ud for input/output connection.
non–tactile switch—a switch asmbly that has a tactile ratio equal to zero.
open circuit resistance—minimum allowable resistance as measured between two test points that,if lower than,will indicate an electrical short.
power capacity—electrical power is defined as current×voltage=V×I(watts)
rigid layer—provides mechanical support for the membrane switch.See Fig.1.
silver migration—a process by which silver,when in contact with insulating materials under electrical potential,is re-moved ionically from its original location,and is redeposited as a metal(silver dendrite)at some other location. spacer layer—a material(usually dielectric)sometimes ud to maint
ain a paration between the membrane layer and static layer of a membrane switch.少儿英语培训费用
specified circuit resistance—maximum allowable circuit re-sistance as measured between two terminations who inter-nal contacts,when held clod,complete a circuit.
1This terminology is under the jurisdiction of ASTM Committee F01on
Electronics and is the direct responsibility of Subcommittee F01.18on Membrane
Switches.
Current edition approved Feb.1,2011.Published March2011.Originally
approved in2001.Last previous edition approved in2002as F2112-02.DOI:
10.1520/F2112-02R11.
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Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959.United States
static layer—a mechanically supported layer which carries one or both poles of the switch or is ud
to short both poles together.The static layer is a required component of a membrane switch.See Fig.1.
tactile layer—optional feature incorporated into a membrane switch to alter the tactile respon.See Fig.1.
tactile respon—a physical nsation caud by a sudden collap and/or snapback of a membrane switch.
tactile switch—a switch asmbly that provides a tactile ratio greater than zero.
test points—two prelected conductive points in a circuit loop,possibly including a switch.
travel—measured distance of movement when a membrane switch is depresd.
ASTM International takes no position respecting the validity of any patent rights asrted in connection with any item mentioned in this standard.Urs of this standard are expressly advid that determination of the validity of any such patent rights,and the risk of 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 and if not revid,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addresd to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.
This standard is copyrighted by ASTM International,100Barr 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 above address or at 610-832-9585(phone),610-832-9555(fax),or rvice@astm (e-mail);or through the ASTM website (www.astm).Permission rights to photocopy the standard may also be cured from the ASTM website (www.astm/
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COPYRIGHT/).
免费学习日语FIG.1Six Basic Layers of a Membrane Switch (Layers are shown as parate components but some can be combined into one layer.For
example a graphic layer can also be the membrane layer.A cond example is the tactile layer can also be the membrane
layer.)
F2112−02(2011)
