ASTM F2188-02(2011)
(Test Method)Standard Test Method for Determining the Effect of Variable Frequency Vibration on a Membrane Switch or Membrane Switch Assembly
Standard Test Method for Determining the Effect of Variable Frequency Vibration on a Membrane Switch or Membrane Switch Assembly
SIGNIFICANCE AND USE
Vibration encountered in the field is not usually simple harmonic.
This test can be used to determine relative motion between parts, critical frequencies, adhesion strengths, loosening of parts or other physical effects that can cause fatigue or failure.
Experience has shown that this test will expose potential failures associated with the electronic components of a membrane switch, where tests of lower levels will not.
This practice can be used to qualify a membrane switch for aerospace, medical and other applications.
This test is potentially destructive, intended for device qualification.
Either Test Condition A or B can be chosen, based upon the intent of the test determined by the qualified engineer.
SCOPE
1.1 This test method establishes procedures for determining the effect of sinusoidal vibration, within the specified frequency range, on switch contacts, mounting hardware, adhered component parts, solder or heat stakes, tactile devices, and cable or ribbon interconnects associated with a membrane switch or membrane switch assembly.
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.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: F2188 − 02 (Reapproved 2011)
Standard Test Method for
Determining the Effect of Variable Frequency Vibration on a
Membrane Switch or Membrane Switch Assembly
This standard is issued under the fixed designation F2188; 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 3.2 This test can be used to determine relative motion
between parts, critical frequencies, adhesion strengths, loosen-
1.1 This test method establishes procedures for determining
ing of parts or other physical effects that can cause fatigue or
the effect of sinusoidal vibration, within the specified fre-
failure.
quency range, on switch contacts, mounting hardware, adhered
3.3 Experience has shown that this test will expose potential
component parts, solder or heat stakes, tactile devices, and
failures associated with the electronic components of a mem-
cable or ribbon interconnects associated with a membrane
brane switch, where tests of lower levels will not.
switch or membrane switch assembly.
3.4 This practice can be used to qualify a membrane switch
1.2 This standard does not purport to address all of the
for aerospace, medical and other applications.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.5 This test is potentially destructive, intended for device
priate safety and health practices and determine the applica-
qualification.
bility of regulatory limitations prior to use.
3.6 Either Test ConditionAor B can be chosen, based upon
the intent of the test determined by the qualified engineer.
2. Terminology
2.1 Definitions:
4. Apparatus
2.1.1 contact closure—the event at which a specified resis-
4.1 Vibration Fixture, capable of holding the unit under test
tance is achieved on a membrane switch.
and subjecting it to the specified random frequency and
2.1.2 critical resonance frequency—any point on the speci-
duration as described in the In-Process Test.
men that is observed to have maximum amplitude or more than
4.2 Contact Closure Detection Device, (if test is performed
twice that of the base input amplitude or support points.
under load conditions), instrumentation capable of resolving a
2.1.3 membrane switch—a momentary switching device in
switch opening time of greater than or equal to 1.0 ms.
which at least one contact is on, or made of, a flexible
4.3 Resonant Detecting Instrumentation, (if determination
substrate.
of critical resonance frequency is desired), capable of deter-
2.1.4 specified resistance—maximum allowable circuit re-
mining the critical resonance frequency.
sistance as measured between two test points whose internal
contacts, when held closed, complete a circuit.
5. Procedure—Test Condition A, 10 g
2.1.5 test points—two pre-selected conductive points in a
5.1 Pre-Test Setup:
circuit loop, possibly including a switch.
5.1.1 Secure membrane switch on vibration test surface
with appropriate fixturing.
3. Significance and Use
5.1.2 Connect switch detection leads to test points on the
membrane switch (if contact closure is being monitored during
3.1 Vibration encountered in the field is not usually simple
the test).
harmonic.
5.1.3 Function testing to be specified and performed again
after test completion for comparison.
5.2 In-Process Test:
This test method is under the jurisdiction of ASTM Committee F01 on
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
5.2.1 Subject test unit to sinusoidal vibration varied in
Switches.
frequency from 10 to 500 Hz at a logarithmic rate of 0.5 octave
Current edition approved Feb. 1, 2011. Published March 2011. Originally
per minute for a duration of 18 cycles per each orthogonal axis
approved in 2002. Last previous edition approved in 2002 as D2188 - 02. DOI:
10.1520/F2188-02R11. (total of 56 times). The amplitude of the vibration shall be
Copyright ©
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.