ASTM F1578-07
(Test Method)Standard Test Method for Contact Closure Cycling of a Membrane Switch
Standard Test Method for Contact Closure Cycling of a Membrane Switch
SIGNIFICANCE AND USE
This testing is performed to determine the electrical contact reliability under switching conditions and the physical changes caused by mechanical actuation of the switch assembly in the environments in which the assemblies operate. Evidence of deterioration, that is, cracking of substrate, domes both metal and polyester, ink delamination, etc., resulting from this test can at times be determined by visual examination. However, the effects may be more readily ascertained by measurements made prior to, during, and after exposure. Total circuit resistance, force-displacement, dielectric strength, insulation resistance, and capacitance are types of measurements that show the deleterious effects due to exposure.
SCOPE
1.1 This test method covers the setup, procedure, and apparatus required to depress and release a membrane switch to a predetermined number of cycles.
1.2 This test method also covers the optional use of specified voltage and current during the cycling of the membrane switch.
1.3 This test method can be used in conjunction with other ASTM standards such as Test Method F 1596.
1.4 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: F1578 − 07
StandardTest Method for
1
Contact Closure Cycling of a Membrane Switch
This standard is issued under the fixed designation F1578; 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 of a Membrane Switch
1.1 This test method covers the setup, procedure, and
3. Terminology
apparatusrequiredtodepressandreleaseamembraneswitchto
3.1 Definitions:
a predetermined number of cycles.
3.1.1 contact closure—the event at which a specified resis-
1.2 This test method also covers the optional use of speci-
tance is achieved.
fied voltage and current during the cycling of the membrane
3.1.2 duty cycle—the ratio of switch closed time to total
switch.
cycle time.
1.3 This test method can be used in conjunction with other
3.1.3 test rate—the number of depressions and release
ASTM standards such as Test Method F1596.
cycles per second.
1.4 This standard does not purport to address all of the
3.1.4 membrane switch—a momentary switching device in
safety concerns, if any, associated with its use. It is the
which at least one contact is on, or made of, a flexible
responsibility of the user of this standard to establish appro-
substrate.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents 4.1 This testing is performed to determine the electrical
2 contact reliability under switching conditions and the physical
2.1 ASTM Standards:
changes caused by mechanical actuation of the switch assem-
D2240 Test Method for Rubber Property—Durometer Hard-
bly in the environments in which the assemblies operate.
ness
Evidence of deterioration, that is, cracking of substrate, domes
F1596 Test Method for Exposure of Membrane Switches to
both metal and polyester, ink delamination, etc., resulting from
Temperature and Relative Humidity
this test can at times be determined by visual examination.
F1661 Test Method for Determining the Contact Bounce
However, the effects may be more readily ascertained by
Time of a Membrane Switch
measurements made prior to, during, and after exposure. Total
F1662 Test Method for Verifying the Specified Dielectric
circuit resistance, force-displacement, dielectric strength, insu-
Withstand Voltage and Determining the Dielectric Break-
lation resistance, and capacitance are types of measurements
down Voltage of a Membrane Switch
that show the deleterious effects due to exposure.
F1689 Test Method for Determining the Insulation Resis-
tance of a Membrane Switch
5. Apparatus
F1663 Test Method for Determining the Capacitance of a
5.1 Suitable Electronic Monitoring Device, to detect and
Membrane Switch
count contact closure at a predetermined or specified test rate
F1680 Test Method for Determining Circuit Resistance of a
and duty cycle.
Membrane Switch
F2592 Test Method for Measuring the Force-Displacement
5.2 Surface, flat, smooth, unyielding, and larger than the
switch.
5.3 Test Probes, built to either of the configurations shown
1
This test method is under the jurisdiction of ASTM Committee F01 on
in Fig. 1 or Fig. 2, are acceptable but must be made of an inert
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
Switches.
elastomeric material with a hardness number equivalent to
Current edition approved Dec. 1, 2007. Published December 2007. Originally
A/45 65 as measured in accordance with Test Method D2240.
approved in 1995. Last previous edition approved in 2001 as F1578 – 01. DOI:
Test probes that do not meet this criteria must be specified and
10.1520/F1578-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or recorded fully.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.4 Device, which will cycle the probe repeatedly into and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. awayfromtheswitchataspecifiedtestrateanddutycycle,and
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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F1578 − 07
6.1.8 Testing should be done under standard laboratory
conditions unless otherwise specified.
6.2 In-Process Test:
6.2.1 Begin cycling at specified test rate and duty cycle.
6.2.2 Measure the characteristics of the switch at desired
intervals as performed in 6.1.2.
NOTE 1—If switch removal from the test table is necessary, return the
switch to the exact location.
6.3 End test:
6.3.1 Stop the test at a preselected duration or at the point of
failure.
6.3.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:F 1578–01
Standard Practice for Designation:F 1578–07
Standard Test Method for
1
Contact Closure Cycling of a Membrane Switch
This standard is issued under the fixed designation F 1578; 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
1.1This practice covers the setup, procedure, and apparatus required to depress and release a membrane switch to a
predetermined number of cycles.
1.2This practice also covers the optional use of specified voltage and current during the cycling of the membrane switch.
1.3
1.1 This test method covers the setup, procedure, and apparatus required to depress and release a membrane switch to a
predetermined number of cycles.
1.2 This test method also covers the optional use of specified voltage and current during the cycling of the membrane switch.
1.3 This test method can be used in conjunction with other ASTM standards such as Test Method F 1596.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 2240 Test Method for Rubber Property—Durometer Hardness
F1597Test Method for Determining the Actuation Force and Contact Force of a Membrane Switch 1596 Test Method for
Exposure of Membrane Switches to Temperature and Relative Humidity
F 1661 Test Method for Determining the Contact Bounce Time of a Membrane Switch
F 1662 Test Method for Verifying the Specified Dielectric Withstand Voltage and Determining the Dielectric Breakdown
Voltage of a Membrane Switch
F 1689 Test Method for Determining the Insulation Resistance of a Membrane Switch
F 1663 Test Method for Determining the Capacitance of a Membrane Switch
F 1680 Test Method for Determining Circuit Resistance of a Membrane Switch
F 2592 Test Method for Measuring the Force-Displacement of a Membrane Switch
3. Terminology
3.1 Definitions:
3.1.1 actuation force—the maximum force measured prior to or including the point at which contact closure is achieved on a
membrane switch.
3.1.2contact closure—the event at which a specified resistance is achieved.
3.1.3contact force—the force at contact closure.
3.1.4duration—the number of depressions and release cycles.
3.1.5
3.1.2 duty cycle—the ratio of switch closed time to total cycle time.
1
This practice is under the jurisdiction of ASTM Committee F01 on Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane Switches .
Current edition approved June 10, 2001. Published August 2001. Originally published as F1578–95. Last previous edition F1578–00.
1
This test method is under the jurisdiction of ASTM Committee F01 on Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane Switches .
Current edition approved Dec. 1, 2007. Published December 2007. Originally approved in 1995. Last previous edition approved in 2001 as F 1578 – 01.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F 1578–07
3.1.6specified resistance—maximum allowable resistance as measured between two terminations whose internal switch contacts
are held closed to complete a circuit.
3.1.7
3.1.3 test rate—the number of depressions and release cycles per second.
3.1.8
3.1.4 membrane switch—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
4. Significance and Use
4.1Contact closure cycling is useful to manufacturers and users for determining the effect of repeated closing of switch contacts
or the effect of repeated flexure of other switch components.
4.2The characteristic(s) are measured before cycling begins and then again after cycling ends.
4.1 This testing is performed to determine the electrical contact reliability under switching conditions and the physical changes
caused by mechanical actuation of t
...
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