ASTM F1570-01
(Test Method)Standard Test Method for Determining the Tactile Ratio of a Membrane Switch
Standard Test Method for Determining the Tactile Ratio of a Membrane Switch
SCOPE
1.1 This test method covers the determination of the tactile response of a membrane switch as defined by tactile ratio.
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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Designation: F 1570 – 01
Standard Test Method for
1
Determining the Tactile Ratio of a Membrane Switch
This standard is issued under the fixed designation F 1570; 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
1.1 This test method covers the determination of the tactile
response of a membrane switch as defined by tactile ratio.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Terminology
2.1 Definitions:
2.1.1 F —maximum force measured prior to or including
max
point (F ) (see Fig. 1 and Fig. 2).
min
2.1.2 F —minimum force seen between F and point at
min max
which probe movement ceases.
2.1.2.1 Discussion—F can equal F .
max min
2.1.3 force-travel curve—relationship between force ap-
plied and travel of a membrane switch.
2.1.3.1 Discussion—Usually expressed as a line graph (see
Fig. 1 and Fig. 2).
2.1.4 membrane switch—a momentary switching device in
which at least one contact is on, or made of, a flexible
substrate.
2.1.5 non-tactile switch—a switch assembly that has a
FIG. 1 Typical Tactile Force–Travel Curve
tactile ratio equal to zero.
2.1.6 tactile ratio—a measure of tactile response (see Eq
3.2 Always report the tactile ratio as a function of measured
6.2).
F . This is important because it is possible to have the same
max
2.1.7 tactile response—a physical sensation, caused by a
tactile ratio for different values of F .
max
sudden collapse or snapback, or both, of a membrane switch.
2.1.7.1 Discussion—The amount of tactile response is de-
4. Apparatus
termined by the equation shown in 6.2.
4.1 Test Probe, made of nonelastic material with shape and
2.1.8 tactile switch—a switch assembly that provides a
size to be specified.
tactile ratio greater than zero.
4.2 Device, to hold probe securely and provide perpendicu-
2.1.9 travel—measured distance of movement when a
lar movement into and away from switch under test.
membrane switch is depressed.
4.3 Monitoring Device, suitable to detect F and F .
max min
3. Significance and Use 4.4 Test Surface, flat, smooth, unyielding, and larger than
switch under test.
3.1 The tactile ratio is useful in quantifying the feel of a
membrane switch. Factors other than tactile ratio may affect
5. Procedure
the“ feel” of a tactile switch.
5.1 Pre-Test Setup:
5.1.1 Secure switch on test surface.
1
This test method is under the jurisdiction of ASTM Committee F01 on
5.1.1.1 Precondition switch by depressing manually 25
Electronics and is the direct respon
...
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