ASTM F1662-10
(Test Method)Standard Test Method for Verifying the Specified Dielectric Withstand Voltage and Determining the Dielectric Breakdown Voltage of a Membrane Switch
Standard Test Method for Verifying the Specified Dielectric Withstand Voltage and Determining the Dielectric Breakdown Voltage of a Membrane Switch
SIGNIFICANCE AND USE
Dielectric withstand voltage testing is useful for design verification, quality control of materials, and workmanship.
This test method is used to verify that the membrane switch can operate safely at its rated voltage, and withstand momentary overpotentials due to switching, surges and other similar electrical phenomena.
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.
Dielectric withstand voltage testing may be destructive and units that have been tested should be considered unreliable for future use.
Testing using ac voltage may be useful for switches intended for control circuits powered by ac voltages.
SCOPE
1.1 This test method covers the verification of a specified dielectric withstand voltage or dielectric breakdown voltage of a membrane switch.
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Designation:F1662 −10
StandardTest Method for
Verifying the Specified Dielectric Withstand Voltage and
Determining the Dielectric Breakdown Voltage of a
1
Membrane Switch
This standard is issued under the fixed designation F1662; 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. Significance and Use
1.1 This test method covers the verification of a specified 4.1 Dielectric withstand voltage testing is useful for design
dielectric withstand voltage or dielectric breakdown voltage of verification, quality control of materials, and workmanship.
a membrane switch.
4.2 This test method is used to verify that the membrane
switch can operate safely at its rated voltage, and withstand
2. Referenced Documents
momentary overpotentials due to switching, surges and other
2
2.1 ASTM Standards:
similar electrical phenomena.
F1680 Test Method for Determining Circuit Resistance of a
4.3 Specific areas of testing are, but not limited to:
Membrane Switch
4.3.1 Conductor/dielectric/conductor crossing point,
F1663 Test Method for Determining the Capacitance of a
4.3.2 Close proximity of conductors, and
Membrane Switch
4.3.3 Any other conductive surface such as shielding or
metal backing panel.
3. Terminology
4.4 Dielectric withstand voltage testing may be destructive
3.1 Definitions:
and units that have been tested should be considered unreliable
3.1.1 dielectric withstand voltage—a voltage, above rated
for future use.
voltage, applied for a specific time between mutually insulated
4.5 Testing using ac voltage may be useful for switches
testpointsorbetweenaninsulatedtestpointandground,which
intended for control circuits powered by ac voltages.
results in no visual change or specified leakage current.
3.1.2 dielectric breakdown voltage—the voltage at which a
5. Interferences
disruptive discharge or excessive leakage current occurs.
5.1 The following parameters may affect the results of this
3.1.3 disruptive discharge—flashover (surface discharge),
test:
spark over (air discharge), or breakdown (puncture discharge).
5.1.1 Humidity,
3.1.4 leakage current—current between mutually insulated
5.1.2 Contamination, and
test points when a voltage is applied.
5.1.3 Temperature.
3.1.5 membrane switch—a momentary switching device in
6. Apparatus
which at least one contact is on, or made of, a flexible
substrate.
6.1 Electric Device, suitable to provide a controlled dc or ac
3.1.6 test points—two preselected mutually insulated loca- voltage, leakage current measurement.
tions on switch assembly.
7. Procedure
7.1 Dielectric Withstand Test Method:
1
This test method is under the jurisdiction of ASTM Committee F01 on
7.1.1 Measure and record the following characteristics prior
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
to performing test:
Switches.
7.1.1.1 Open and closed circuit resistance of the test points
Current edition approved May 1, 2010. Published June 2010. Originally
in accordance with Test Method F1680.
approved in 1995. Last previous edition approved in 2004 as F1662 - 04. DOI:
10.1520/F1662-10.
7.1.1.2 Capacitance of the test point in accordance with
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
F1663.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1.2 Connect two test points on the switch assembly, each
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. to a separate polarity, on the voltage source.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1662−10
7.1.3 Select test voltage from Table 1. 8. Report
7.1.4 Apply the test voltage from zero to specified value as
8.1 Report the following information:
1
uniformly as possible, at a rate of approximately ⁄2 of the test
8.1.1 Temperature,
voltage per second (V/s), unless otherwise specified. For
8.1.2 Relative humidity,
example, Level 2 in Table 1, the ramp rate is 250 V/s for a test
8.1.3 Specified dielectric withstand voltage (pass or fail),
voltage of 500 V dc.
8.1.4 Circuit resistance pre and post (Dielectric Withstand
7.1.5 Apply test voltage to switch assembly for 60 s.
Test),
7.1.6 Record visual changes or leakage current, or both, if
8.1.5 Capacitance pre and post (Dielectric Withstand Test),
any.
8.1.6 Delectric breakdown voltage,
7.1.7 Dissipate all charges to ground using appropriate
8.1.7 Actual applied voltage or failure voltage,
methods prior to continuing test to next test voltage (repeat
8.1.8 Dur
...
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:F1662–04 Designation: F1662 – 10
Standard Test Method for
Verifying the Specified Dielectric Withstand Voltage and
Determining the Dielectric Breakdown Voltage of a
1
Membrane Switch
This standard is issued under the fixed designation F1662; 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 verification of a specified dielectric withstand voltage or dielectric breakdown voltage of a
membrane switch.
2. Referenced Documents
2
2.1 ASTM Standards:
F1680 Test Method for Determining Circuit Resistance of a Membrane Switch
F1663 Test Method for Determining the Capacitance of a Membrane Switch
3. Terminology
3.1 Definitions:
3.1.1 dielectric withstand voltage—a voltage, above rated voltage, applied for a specific time between mutually insulated test
points or between an insulated test point and ground, which results in no visual change or specified leakage current.
3.1.2 dielectric breakdown voltage—the voltage at which a disruptive discharge or excessive leakage current occurs.
3.1.3 disruptive discharge—flashover (surface discharge), spark over (air discharge), or breakdown (puncture discharge).
3.1.4 leakage current—current between mutually insulated test points when a voltage is applied.
3.1.5 membrane switch—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
3.1.6 test points—two preselected mutually insulated locations on switch assembly.
4. Significance and Use
4.1 Dielectric withstand voltage testing is useful for design verification, quality control of materials, and workmanship.
4.2 This test method is used to verify that the membrane switch can operate safely at its rated voltage, and withstand momentary
overpotentials due to switching, surges and other similar electrical phenomena.
4.3 Specific areas of testing are, but not limited to:
4.3.1 Conductor/dielectric/conductor crossing point,
4.3.2 Close proximity of conductors, and
4.3.3 Any other conductive surface such as shielding or metal backing panel.
4.4 Dielectric withstand voltage testing may be destructive and units that have been tested should be considered unreliable for
future use.
4.5 Testing using ac voltage may be useful for switches intended for control circuits powered by ac voltages.
5. Interferences
5.1 The following parameters may affect the results of this test:
5.1.1 Humidity,
5.1.2Contamination,
5.1.3Barometric pressure, and
5.1.4Temperature.
5.1.2 Contamination, and
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 May 1, 2004.2010. Published June 2004.2010. Originally approved in 1995. Last previous edition approved in 20032004 as F1662-03. F1662
- 04. DOI: 10.1520/F1662-104.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F1662 – 10
5.1.3 Temperature.
6. Apparatus
6.1 Electric Device, suitable to provide a controlled dc or ac voltage, leakage current measurement.
7. Procedure
7.1 Dielectric Withstand Test Method:
7.1.1 Measure and record the following characteristics prior to performing test:
7.1.1.1 Open and closed circuit resistance of the test points in accordance with Test Method F1680.
7.1.1.2 Capacitance of the test point in accordance with F1663.
7.1.2 Connect two test points on the switch assembly, each to a separate polarity, on the voltage source.
7.1.3 Select test voltage from Table 1.
1
7.1.4 Apply the test voltage from zero to specified value as uniformly as possible, at a rate of approximately ⁄2 of the test
voltage per second (V/s), unless otherwise specified. For example, Level 2 in Table 1, the ramp rate is 250 V/s for a test voltage
of 500 V dc.
7.1.5 Apply test voltage to switch assembly for 60 s.
7.1.6 Record visual changes or leakage current, or both, if any.
7.1.7 Dissipate all charges to ground using appropriate methods prior to continuing te
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