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ASTM F1762-97

(Practice)

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

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

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
09-Jan-2002
ICS
31.220.20 - Switches
Technical Committee
F01 - Electronics
Drafting Committee
F01.18 - Printed Electronics
Current Stage
Ref Project

Relations

Replaced By
ASTM F1762-02 - Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric Pressure
Effective Date
10-Jan-2002

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ASTM F1762-97 - Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric PressureASTM F1762-97 - Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric Pressure
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ASTM F1762-97 - Standard Practice for Exposing a Membrane Switch to Variation in Atmospheric Pressure
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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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: F 1762 – 97
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 5.2 Temperature,
5.3 Humidity,
1.1 This practice covers a procedure for exposing a mem-
5.4 Mounting Method (if applicable).
brane switch to variations in atmospheric pressure. It can be
used to determine the effects of pressure variations on chemical
6. Apparatus
and mechanical properties and functional characteristics of the
6.1 Pressure Chamber, a chamber or cabinet capable of
switch.
maintaining a specified pressure. If procedurally required, the
apparatus shall be capable of providing pressure variation at a
2. Referenced Documents
specified rate.
2.1 ASTM Standards:
6.2 Monitoring Device, suitable to detect contact closure
F 1570 Test Method for Determining the Tactile Ratio of a
(that is, ohm meter, etc.).
2
Membrane Switch
F 1597 Test Method for Determining the Actuation Force
7. Conditioning
2
and Contact Force of a Membrane Switch
7.1 Condition all specimens for 72 h at ambient laboratory
conditions immediately prior to exposure, or prior to pressure
3. Terminology
cycling. This is to enable the specimens to stabilize.
3.1 Definitions:
8. Procedure
3.1.1 membrane switch—a momentary switching device in
which at least one contact is on (or made of) a flexible
8.1 Pretest Setup:
substrate.
8.1.1 Measure or observe the desired characteristics of the
3.1.2 contact closure—the point at which a specified resis-
switch so that comparable measurements and observations can
tance is achieved.
be made during or after the test.
3.1.3 specified resistance—the maximum allowable resis-
8.1.1.1 Document the setup, test equipment, and mounting
tance as a measure between two terminations whose internal
procedure (if applicable) used to measure the characteristics.
switch contacts complete a circuit when held closed.
8.1.2 Connect predetermined switch terminations to contact
closure measuring device.
4. Significance and Use
8.2 In-Process Test:
4.1 Erratic operation or malfunction of a membrane switch
8.2.1 Place specimens in the chamber at ambi
...

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3.1 Illumination of a switch or of certain features of a switch often has a functional purpose and must meet specification to satisfy the functional requirements of the switch.  
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SIGNIFICANCE AND USE
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3.2 ESD shielding effectiveness test may be destructive, and units that have been tested should be considered unreliable for future use.
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1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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..

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