ASTM F2187-02

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.

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 F2187-02(2011) - Standard Test Method for Determining the Effect of Random 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F2187–02
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 4. Apparatus
1.1 This test method establishes procedures for determining 4.1 Vibration Fixture, capable of holding the unit under test
the effect of random vibration, within the specified frequency and subjecting it to the specified random frequency and
range, on switch contacts, mounting hardware, adhered com- duration as described in the In-Process Test.
ponent parts, solder or heat stakes, tactile devices, and cable or 4.2 Contact Closure Detection Device, instrumentation ca-
ribbon interconnects associated with a membrane switch or pable of resolving a switch opening time of greater than or
membrane switch assembly. equal to 1.0 ms.
2. Terminology 5. Procedure
2.1 Definitions: 5.1 Pre-Test Setup:
2.1.1 contact closure—the event at which a specified resis- 5.1.1 Secure membrane switch on vibration test surface
tance is achieved on a membrane switch. with appropriate fixturing.
2.1.2 membrane switch—a momentary switching device in 5.1.2 Function testing to be specified and performed again
which at least one contact is on, or made of, a flexible after test completion for comparison.
substrate. 5.1.3 Connect switch detection leads to test points on the
2.1.3 specified resistance—maximum allowable circuit re- membrane switch.
sistance as measured between two test points whose internal 5.2 In-Process Test:
contacts, when held closed, complete a circuit. 5.2.1 Subject to a random vibration over the bandwidth of
2.1.4 test points—two pre-selected conductive points in a 10 to 2000 for a duration of 1 h per each orthogonal axis (total
circuit loop, possibly including a switch. of 3 h). The break points shall be as follows:
NOTE 1—The tolerance shall be 63db for this test.
3. Significance and Use
Frequency G /Hz
3.1 Vibration encountered in the field is usually random in
40 0.04
nature and this test can be used to determine the effects of 2000 0.04
Overall GRMS 8.85
random excitation on the membrane switch.
5.2.2 Visual inspection shall be conducted after each axis of
3.2 Random vibration can cause mechanical fatigue and
failure by switch components either loosening or otherwise vibration.
5.2.3 Electrical and functional testing shall be specified by
changing over time.
3.3 Experience has shown that this test will expose potential the qualified engineer and performed at either test completion
or between e
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