ASTM F1762-07

Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric Pressure

SIGNIFICANCE AND USE
Erratic operation or malfunction of a membrane switch resulting from changes in the specified switch characteristics,
Rupture, implosion or explosion of seals due to pressure variations,
Change in physical or chemical properties due to pressure differentiations, and
Delaminations of a membrane switch may occur due to pressure variations.
SCOPE
1.1 This practice covers a procedure for exposing a membrane switch to variations in atmospheric pressure. It can be used to determine the effects of pressure variations on chemical and mechanical properties and functional characteristics of the switch.

General Information

• Status: Historical
• Publication Date: 30-Nov-2007
• ICS: 31.220.20 - Switches
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.18 - Printed Electronics

Relations

• Replaces: ASTM F1762-02 - Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric Pressure
• Effective Date: 01-Dec-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F1762 − 07
StandardPractice for
Exposing a Membrane Switch to Variation in Atmospheric
1
Pressure
This standard is issued under the fixed designation F1762; 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. Interferences
4.1 Time duration before, during and after pressure cycling,
1.1 This practice covers a procedure for exposing a mem-
brane switch to variations in atmospheric pressure. It can be
4.2 Temperature,
used to determine the effects of pressure variations on chemical
4.3 Humidity,
and mechanical properties and functional characteristics of the
switch. 4.4 Mounting Method (if applicable).
5. Apparatus
2. Terminology
5.1 Pressure Chamber, a chamber or cabinet capable of
2.1 Definitions:
maintaining a specified pressure. If procedurally required, the
2.1.1 circuit resistance—electrical resistance as measured
apparatus shall be capable of providing pressure variation at a
between two test points whose internal contacts, when held
specified rate.
closed, complete a circuit.
5.2 Monitoring Device, suitable to detect contact closure
2.1.2 contact closure—the event at which a specified resis-
(that is, ohm meter, etc.).
tance is achieved on a membrane switch.
2.1.3 membrane switch—a momentary switching device in
6. Conditioning
which at least one contact is on, or made of, a flexible
6.1 Condition all specimens for 72 h at ambient laboratory
substrate.
conditions immediately prior to exposure, or prior to pressure
2.1.4 specified resistance—the maximum allowable circuit
cycling. This is to enable the specimens to stabilize.
resistance as measured between two test points whose internal
contacts, when held closed, complete a circuit.
7. Procedure
2.1.5 test points—two preselected conductive points in a
7.1 Pretest Setup:
circuit loop, possibly including a switch.
7.1.1 Measure or observe the desired characteristics of the
switch so that comparable measurements and observations can
3. Significance and Use
be made during or after the test.
3.1 Erratic operation or malfunction of a membrane switch
7.1.1.1 Document the setup, test equipment, and mounting
resulting from changes in the specified switch characteristics,
procedure (if applicable) used to measure the characteristics.
7.1.2 Connect predetermined switch terminations to contact
3.2 Rupture, implosion or explosion of seals due to pressure
closure measuring device.
variations,
7.2 In-Process Test:
3.3 Change in physical or chemical properties
...

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 1762–02 Designation:F 1762–07
Standard Practice for
Exposing a Membrane Switch to Variation in Atmospheric
1
Pressure
This standard is issued under the fixed designation F 1762; 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
1.1 This practice covers a procedure for exposing a membrane switch to variations in atmospheric pressure. It can be used to
determine the effects of pressure variations on chemical and mechanical properties and functional characteristics of the switch.
2. Referenced Documents
2.1ASTM Standards:
F 1570Test Method for Determining the Tactile Ratio of a Membrane Switch
F 1597Test Method for Determining the Actuation Force and Contact Force of a Membrane Switch
3.Terminology
3.1Definitions:
3.1.1
2.1 Definitions:
2.1.1 circuit resistance—electrical resistance as measured between two test points whose internal contacts, when held closed,
complete a circuit.
3.1.2
2.1.2 contact closure—the event at which a specified resistance is achieved on a membrane switch.
3.1.3
2.1.3 membrane switch—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
3.1.4
2.1.4 specified resistance—the maximum allowable circuit resistance as measured between two test points whose internal
contacts, when held closed, complete a circuit.
3.1.5
2.1.5 test points—two preselected conductive points in a circuit loop, possibly including a switch.
4.
3. Significance and Use
43.1 Erratic operation or malfunction of a membrane switch resulting from changes in the specified switch characteristics,
43.2 Rupture, implosion or explosion of seals due to pressure variations,
43.3 Change in physical or chemical properties due to pressure differentiations, and
43.4 Delaminations of a membrane switch may occur due to pressure variations.
5.4. Interferences
5.1Time4.1 Time duration before, during and after pressure cycling,
54.2 Temperature,
54.3 Humidity,
54.4 Mounting Method (if applicable).
6.5. Apparatus
6.1
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 Jan. 10, 2002. Published March 2002. Originally published as F 1762–96. Last previous editon F 1762–97.
Current edition approved Dec. 1, 2007. Published December 2007. Originally approved in 1996. Last previous edition approved in 2002 as F 1762–02.
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