ASTM F1663-09

Standard Test Method for Determining the Capacitance of a Membrane Switch

SIGNIFICANCE AND USE
Capacitance testing is useful for design verification, quality control of materials, and workmanship.
High capacitance may interfere with the reliable performance of interface electronics.
Specific areas of testing are, but not limited to:
Conductor/dielectric/conductor crossing point,
Close proximity of conductors, and
Any other conductive surface such as shielding or metal backing panel.
SCOPE
1.1 This test method covers the determination of capacitance(s) of a membrane switch.
1.2 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

• Status: Historical
• Publication Date: 14-Jun-2009
• ICS: 29.120.40 - Switches
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.18 - Printed Electronics

Relations

• Replaces: ASTM F1663-95(2002) - Standard Test Method for Determining the Capacitance of a Membrane Switch
• Effective Date: 15-Jun-2009
• Referred By: ASTM F1662-16 - Standard Test Method for Verifying the Specified Dielectric Withstand Voltage and Determining the Dielectric Breakdown Voltage of a Membrane Switch or Printed Electronic Device (Withdrawn 2023)
• Effective Date: 15-Jun-2009
• Referred By: ASTM F1596-15 - Standard Test Method for Exposure of a Membrane Switch or Printed Electronic Device to Temperature and Relative Humidity
• Effective Date: 15-Jun-2009

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F1663 − 09
StandardTest Method for
1
Determining the Capacitance of a Membrane Switch
This standard is issued under the fixed designation F1663; 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 5. Apparatus
1.1 This test method covers the determination of capaci- 5.1 Electronic Test Instrument , for measuring very small
tance(s) of a membrane switch. capacitance (pico-farad range).
1.2 This standard does not purport to address all of the
6. Procedure
safety concerns, if any, associated with its use. It is the
6.1 Pretest Setup:
responsibility of the user of this standard to establish appro-
6.1.1 Suspend the switch specimen in air or otherwise
priate safety and health practices and determine the applica-
isolate it from any interfering affects.
bility of regulatory limitations prior to use.
6.1.2 Attach to the capacitance measuring instrument any
necessary leads, probes or connectors required to connect the
2. Terminology
membrane switch assembly for measurement. Place test leads
2.1 Definitions:
as close to test points as possible without physical connection.
2.1.1 membrane switch—a momentary switching device in
(This will reduce any variations due to lead positioning).
which at least one contact is on, or made of, a flexible
6.1.3 Record the capacitance reading indicated on the in-
substrate.
strument to equal capacitance (C) (this is the capacitance of
i
2.1.2 test points—two preselected mutually insulated loca-
the test setup).
tions on switch assembly.
6.2 In-Process Test:
6.2.1 Connect test leads to the test points.
3. Significance and Use
6.2.2 Record the capacitance reading indicated on the in-
3.1 Capacitance testing is useful for design verification,
strument to equal total capacitance (C) (this is the total
t
quality control of materials, and workmanship.
capacitance of the switch and device.
3.2 High capacitance may interfere with the reliable perfor-
7. Calculation
mance of interface electronics.
7.1 Calculate the capacitance of the switch specimen as
3.3 Specific areas of testing are, but not limited to:
follows:
3.3.1 Conductor/dielectric/conductor crossing point,
3.3.2 Close proximity of conductors, and
Capacitance C 5 C 2 C
~ !
s t i
3.3.3 Any other conductive surface such as shielding or
8. Report
metal backing panel.
8.1 Report the following information:
4. Interferences
8.1.1 Temperature,
8.1.2 Humidity,
4.1 The following parameters may affect the results of this
8.1.3 Barometric pressure,
test:
8.1.4 Date of test,
4.1.1 Humidity,
8.1.5 Part number or descrip
...

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 1663–95 (Reapproved 2002) Designation:F 1663–09
Standard Test Method for
1
Determining the Capacitance of a Membrane Switch
This standard is issued under the fixed designation F 1663; 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
1.1 This test method covers the determination of capacitance(s) of a membrane switch.
1.2 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.
2. Terminology
2.1 Definitions:
2.1.1 membrane switch—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
2.1.2 test points—two preselected mutually insulated locations on switch assembly.
3. Significance and Use
3.1 Capacitance testing is useful for design verification, quality control of materials, and workmanship.
3.2 High capacitance may interfere with the reliable performance of interface electronics.
3.3 Specific areas of testing are, but not limited to:
3.3.1 Conductor/dielectric/conductor crossing point,
3.3.2 Close proximity of conductors, and
3.3.3 Any other conductive surface such as shielding or metal backing panel.
4. Interferences
4.1 The following parameters may affect the results of this test:
4.1.1 Humidity,
4.1.2 Contamination,
4.1.3 Barometric pressure, and
4.1.4 Temperature.
5. Apparatus
5.1 Electronic Test Instrument , for measuring very small capacitance (pico-farad range).
6. Procedure
6.1 Pretest Setup:
6.1.1 Suspend the switch specimen in air or otherwise isolate it from any interfering affects.
6.1.2 Attach to the capacitance measuring instrument any necessary leads, probes or connectors required to connect the
membrane switch assembly for measurement. Place test leads as close to test points as possible without physical connection. (This
will reduce any variations due to lead positioning).
6.1.3 Record the capacitance reading indicated on the instrument to equal capacitance (C) (this is the capacitance of the test
i
setup).
6.2 In-Process Test:
6.2.1 Connect test leads to the test points.
6.2.2 Record the capacitance reading indicated on the instrument to equal total capacitance (C) (this is the total capacitance of
t
the switch and device.
1
This test method is under the jurisdiction of
...