ASTM F2187-02(2011)
(Test Method)Standard Test Method for Determining the Effect of Random Frequency Vibration on a Membrane Switch or Membrane Switch Assembly
Standard Test Method for Determining the Effect of Random Frequency Vibration on a Membrane Switch or Membrane Switch Assembly
SIGNIFICANCE AND USE
Vibration encountered in the field is usually random in nature and this test can be used to determine the effects of random excitation on the membrane switch.
Random vibration can cause mechanical fatigue and failure by switch components either loosening or otherwise changing over time.
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.
SCOPE
1.1 This test method establishes procedures for determining the effect of random 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: F2187 − 02 (Reapproved 2011)
Standard Test Method for
Determining the Effect of Random Frequency Vibration on a
Membrane Switch or Membrane Switch Assembly
This standard is issued under the fixed designation F2187; 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 Random vibration can cause mechanical fatigue and
failure by switch components either loosening or otherwise
1.1 This test method establishes procedures for determining
changing over time.
the effect of random vibration, within the specified frequency
3.3 Experience has shown that this test will expose potential
range, on switch contacts, mounting hardware, adhered com-
ponent parts, solder or heat stakes, tactile devices, and cable or failures associated with the electronic components of a mem-
ribbon interconnects associated with a membrane switch or brane switch, where tests of lower levels will not.
membrane switch assembly.
3.4 This practice can be used to qualify a membrane switch
for aerospace, medical and other applications.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3.5 This test is potentially destructive, intended for device
standard.
qualification.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Vibration Fixture, capable of holding the unit under test
priate safety and health practices and determine the applica-
and subjecting it to the specified random frequency and
bility of regulatory limitations prior to use.
duration as described in the In-Process Test.
4.2 Contact Closure Detection Device, instrumentation ca-
2. Terminology
pable of resolving a switch opening time of greater than or
2.1 Definitions:
equal to 1.0 ms.
2.1.1 contact closure—the event at which a specified resis-
tance is achieved on a membrane switch.
5. Procedure
2.1.2 membrane switch—a momentary switching device in
5.1 Pre-Test Setup:
which at least one contact is on, or made of, a flexible
5.1.1 Secure membrane switch on vibration test surface
substrate.
with appropriate fixturing.
2.1.3 specified resistance—maximum allowable circuit re-
5.1.2 Function testing to be specified and performed again
sistance as measured between two test points whose internal
after test completion for comparison.
contacts, when held closed, complete a circuit.
5.1.3 Connect switch detection leads to test points on the
membrane switch.
2.1.4 test points—two pre-selected conductive points in a
circuit loop, possibly including a switch.
5.2 In-Process Test:
5.2.1 Subject to a random vibration over the bandwidth of
3. Significance and Use
10 to 2000 for a duration of 1 h per each orthogonal axis (total
of 3 h). The break points shall be as follows:
3.1 Vibration encountered in the field is usually random in
NOTE
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