ASTM F1597-00
(Test Method)Standard Test Method for Determining the Actuation Force and Contact Force of a Membrane Switch
Standard Test Method for Determining the Actuation Force and Contact Force of a Membrane Switch
SCOPE
1.1 This test method covers the measurement of actuation force or contact force, or both, of a membrane switch utilizing a pre-determined resistance value.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: F 1597 – 00
Standard Test Method for
Determining the Actuation Force and Contact Force of a
Membrane Switch
This standard is issued under the fixed designation F 1597; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the measurement of actuation 4.1 Specified resistance is useful to manufacturers and users
force or contact force, or both, of a membrane switch utilizing when designing membrane switch interface circuitry.
a pre-determined resistance value. 4.2 Actuation force and contact force are useful to manu-
1.2 This standard does not purport to address all of the facturers and users in determining the suitability, preference
safety concerns, if any, associated with its use. It is the and aesthetics of a membrane switch in a given application.
responsibility of the user of this standard to establish appro-
5. Apparatus
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.1 Test Probe—Test probes that do not meet the following
criteria must be fully specified and recorded. Do not change
2. Referenced Documents
probe type throughout the duration of the test.
2.1 ASTM Standards:
D 2240 Test Method for Rubber Property-Durometer Hard-
ness
F 1570 Test Method for Determining the Tactile Ratio of a
Membrane Switch
3. Terminology
3.1 Definitions:
3.1.1 actuation force (Fa)—the maximum force measure
prior to or including point at which contact closure is achieved
on a membrane switch.
3.1.2 contact closure (make)—the event at which a specified
resistance is achieved.
3.1.3 contact force (Fc)—the force at contact closure.
FIG. 1 Test Probe Option
3.1.4 membrane switch—a momentary switching device in
which at least one contact is on, or made of, a flexible
substrate.
Switch to be measured Material Size and Shape
3.1.5 non-tactile switch—a switch assembly that has a
Tactile switch Non-elastic To be specified
tactile ratio equal to zero (see Test Method F 1570).
Non-tactile switch Inert elastomeric material Fig. 1 or Fig. 2 or speci-
3.1.6 specified resistance—maximum allowable resistance
Hardness = A/456 5 per fied
as measured between two terminations whose internal switch
Test Method D 2240
contacts, when held closed, complete a circuit.
5.2 Test Surface, flat, smooth, unyielding and larger than
3.1.7 tactile switch—a switch assembly that provides a
switch under test.
tactile ratio greater than zero (see Test Method F 1570).
5.3 Device, to hold test probe securely and provide perpen-
dicular movement into and away from switch under test.
5.4 Resistance Measuring Device, that is, Ohm meter. The
device should not apply a voltage outside the operating range
This test method is under the jurisdiction of ASTM Committee F1 on
of the switch contacts.
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
Switches.
5.5 Suitable Monitoring Device, to measure force on test
Curre
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