ASTM F2188-02

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.

General Information

• Status: Historical
• Publication Date: 09-May-2002
• ICS: 29.120.40 - Switches
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.18 - Printed Electronics

Relations

• Replaced By: ASTM F2188-02(2011) - Standard Test Method for Determining the Effect of Variable Frequency Vibration on a Membrane Switch or Membrane Switch Assembly
• Effective Date: 01-Feb-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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 3.4 This practice can be used to qualify a membrane switch
for aerospace, medical and other applications.
1.1 This test method establishes procedures for determining
3.5 This test is potentially destructive, intended for device
the effect of sinusoidal vibration, within the specified fre-
qualification.
quency range, on switch contacts, mounting hardware, adhered
3.6 Either Test ConditionAor B can be chosen, based upon
component parts, solder or heat stakes, tactile devices, and
the intent of the test determined by the qualified engineer.
cable or ribbon interconnects associated with a membrane
switch or membrane switch assembly.
4. Apparatus
2. Terminology 4.1 Vibration Fixture, capable of holding the unit under test
and subjecting it to the specified random frequency and
2.1 Definitions:
duration as described in the In-Process Test.
2.1.1 contact closure—the event at which a specified resis-
4.2 Contact Closure Detection Device, (if test is performed
tance is achieved on a membrane switch.
under load conditions), instrumentation capable of resolving a
2.1.2 critical resonance frequency—any point on the speci-
switch opening time of greater than or equal to 1.0 ms.
men that is observed to have maximum amplitude or more than
4.3 Resonant Detecting Instrumentation, (if determination
twice that of the base input amplitude or support points.
of critical resonance frequency is desired), capable of deter-
2.1.3 membrane switch—a momentary switching device in
mining the critical resonance frequency.
which at least one contact is on, or made of, a flexible
substrate.
5. Procedure—Test Condition A, 10 g
2.1.4 specified resistance—maximum allowable circuit re-
5.1 Pre-Test Setup:
sistance as measured between two test points whose internal
5.1.1 Secure membrane switch on vibration test surface
contacts, when held closed, complete a circuit.
with appropriate fixturing.
2.1.5 test points—two pre-selected conductive points in a
5.1.2 Connect switch detection leads to test points on the
circuit loop, possibly including a switch.
membrane switch (if contact closure is being monitored during
3. Significance and Use the test).
5.1.3 Function testing to be specified and performed again
3.1 Vibration encountered in the field is not usually simple
after test completion for comparison.
harmonic.
5.2 In-Process Test:
3.2 This test can be used to determine relative motion
5.2.1 Subject test unit to sinusoidal vibration varied in
between parts, critical frequencies, adhesion strengths, loosen-
frequency from 10 to 500 Hz at a logarithmic rate of 0.5 octave
ing of parts or other physical effects that can cause fatigue or
per minute for a duration of 18 cycles per each orthogonal axis
failure.
(total of 56 times). The amplitude of the vibration shall be
3.3 Experience has shown that this test will expose potential
either 0.06-in. double inch amplitude or 10 gravities (g-peak),
failures associated with the electronic components of a mem-
whichever is less. The tolerance for the vibration profile is
brane switch, where tests of lower levels will not.
63dB.
5.2.2 Visual inspection shall be conducted after each axis of
This test method is under the jurisdiction of ASTM Committee F01 on
vibration.
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
5.2.3 Electrical and functional testing
...