ASTM F1662-10

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Designation:F1662 −10
StandardTest Method for
Verifying the Specified Dielectric Withstand Voltage and
Determining the Dielectric Breakdown Voltage of a
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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
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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:
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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
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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.
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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:
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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
...