ASTM F2112-02
(Terminology)Standard Terminology for Membrane Switches
Standard Terminology for Membrane Switches
SCOPE
1.1 This terminology defines terms that are commonly used in the membrane switch industry.
1.2 These definitions are not mutually exclusive.
General Information
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Standards Content (Sample)
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Designation:F2112–02
Standard Terminology for
1
Membrane Switches
This standard is issued under the fixed designation F2112; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope insulation resistance—the electrical resistance between two
isolated test points on a membrane switch.
1.1 This terminology defines terms that are commonly used
leakage current—current flow through the insulation between
in the membrane switch industry.
test points.
1.2 These definitions are not mutually exclusive.
membrane layer—a flexible dynamic layer which carries one
2. Terminology
or both switch poles the deflection of which is used to short
both poles together. The membrane layer is a required
actuation force—the maximum force measured prior to or
component of a membrane switch. See Fig. 1.
including point at which contact closure is achieved on a
membrane switch—a momentary switching device in which
membrane switch.
at least one contact is on, or made of, a flexible substrate.
bend—to force from a straight form into different and espe-
membrane switch flex tail—flexible portion of a membrane
cially a curved one.
switch used for input/output connection.
bend cycle—a fold of a sample around a specified mandrel
non–tactile switch—a switch assembly that has a tactile ratio
which is “rolled” in one direction, followed by rolling in the
equal to zero.
opposite direction, returning the sample to its original
open circuit resistance—minimum allowable resistance as
position.
measured between two test points that, if lower than, will
circuit resistance—electrical resistance as measured between
indicate an electrical short.
two test points whose internal contacts, when held closed,
power capacity—electrical power is defined as current 3
complete a circuit.
voltage = V 3 I (watts)
conductor resistance—the measured electrical resistance
rigid layer—provides mechanical support for the membrane
through a circuit loop between two test points.
switch. See Fig. 1.
contact bounce—intermittent contact opening and contact
silver migration—a process by which silver, when in contact
closure that may occur after switch operation.
with insulating materials under electrical potential, is re-
contact closure—the event at which a specified resistance is
moved ionically from its original location, and is redeposited
achieved on a membrane switch.
as a metal (silver dendrite) at some other location.
contact force—the force at contact closure.
spacer layer—a material (usually dielectric) sometimes used
crease—a ridge or groove made by folding and pressing.
to maintain a separation between the membrane layer and
crease cycle—a 180 degree crease followed by a flattening of
static layer of a membrane switch.
the crease.
specified circuit resistance—maximum allowable circuit re-
current carrying capacity—the maximum level of electrical
sistance as measured between two terminati
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