ASTM F1570-01e1

Standard Test Method for Determining the Tactile Ratio of a Membrane Switch (Withdrawn 2007)

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.
WITHDRAWN RATIONALE
This test method covers the determination of the tactile response of a membrane switch as defined by tactile ratio.
Formerly under the jurisdiction of Committee F01 on Electronics and F01.18 on Membrane Switches, this test method was withdrawn in June 2007 in accordance with section 10.6.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Sep-2001
• Withdrawal Date: 23-Aug-2007
• ICS: 31.220.20 - Switches
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.18 - Printed Electronics

Relations

• Replaces: ASTM F1570-01 - Standard Test Method for Determining the Tactile Ratio of a Membrane Switch
• Effective Date: 10-Sep-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
e1
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
e NOTE—The equation in 6.2 was corrected editorially in December 2001.
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
6.2).
3. Significance and Use
2.1.7 tactile response—a physical sensation, caused by a
3.1 The tactile ratio is useful in quantifying the feel of a
sudden collapse or snapback, or both, of a membrane switch.
membrane switch. Factors other than tactile ratio may affect
2.1.7.1 Discussion—The amount of tactile response is de-
the“ feel” of a tactile switch.
termined by the equation shown in 6.2.
3.2 Always report the tactile ratio as a function of measured
2.1.8 tactile switch—a switch assembly that provides a
F . This is important because it is possible to have the same
tactile ratio greater than zero. max
tactile ratio for different values of F .
2.1.9 travel—measured distance of movement when a
max
membrane switch is depressed.
4. Apparatus
4.1 Test Probe, made of nonelastic material with shape and
1
This test method is under the jurisdiction of ASTM Committee F01 on
size to be specified.
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
4.2 Device, to hold probe securely and provide perpendicu-
Switches.
lar movement into and away from switch under test.
Current edition approved Sept 10, 2001. Published November 2001. Originally
4.3 Monitoring Device, suitable to detect F and F .
published as F 1570 – 94. Last previous edition F 1
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