ASTM F1662-04

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Designation: F1662 – 04
Standard Test 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 3.1.6 test points—two preselected mutually insulated loca-
tions on switch assembly.
1.1 This test method covers the verification of a specified
dielectric withstand voltage or dielectric breakdown voltage of
4. Significance and Use
a membrane switch.
4.1 Dielectric withstand voltage testing is useful for design
2. Referenced Documents verification, quality control of materials, and workmanship.
2 4.2 This test method is used to verify that the membrane
2.1 ASTM Standards:
switch can operate safely at its rated voltage, and withstand
F1680 Test Method for Determining Circuit Resistance of a
momentary overpotentials due to switching, surges and other
Membrane Switch
similar electrical phenomena.
F1663 Test Method for Determining the Capacitance of a
4.3 Specific areas of testing are, but not limited to:
Membrane Switch
4.3.1 Conductor/dielectric/conductor crossing point,
3. Terminology 4.3.2 Close proximity of conductors, and
4.3.3 Any other conductive surface such as shielding or
3.1 Definitions:
metal backing panel.
3.1.1 dielectric withstand voltage—a voltage, above rated
4.4 Dielectric withstand voltage testing may be destructive
voltage, applied for a specific time between mutually insulated
and units that have been tested should be considered unreliable
testpointsorbetweenaninsulatedtestpointandground,which
for future use.
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,
test points when a voltage is applied.
5.1.3 Barometric pressure, and
3.1.5 membrane switch—a momentary switching device in
5.1.4 Temperature.
which at least one contact is on, or made of, a flexible
substrate.
6. Apparatus
6.1 Electric Device, suitable to provide a controlled dc
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This test method is under the jurisdiction of ASTM Committee F01 on
voltage, leakage current measurement.
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
Switches.
7. Procedure
Current edition approved May 1, 2004. Published June 2004. Originally
7.1 Dielectric Withstand Test Method:
approved in 1995. Last previous edition approved in 2003 as F1662-03. DOI:
10.1520/F1662-04.
7.1.1 Measure and record the following characteristics prior
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to performing test:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1.1.1 Open and closed circuit resistance of the test points
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in accordance with Test Method F1680.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F1662 – 04
7.1.1.2 Capacitance of the test point in accordance with 7.2.3 Record visual changes and magnitude of breakdown
F1663. voltage, if any.
7.1.2 Connect two test points on the switch assembly, each 7.2.4 Dissipate all charges to ground using appropriate
to a separate polarity, on the voltage source. methodspriortocontinuingtesttoadditionaltestpoints(repeat
7.1.3 Select test voltage from Table 1. 7.2.1 to 7.2.4).
7.1.4 Apply the test voltage from zero to specified value as
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uniformly as possible, at a rate of approximately ⁄2 of the test 8. Report
voltage per second (V/s), unless otherwise specified. For
8.1 Report the following information:
example, Level 2 in Table 1, the ramp rate is 250 V/s for a test
8.1.1 Temperature,
voltage of 500 V dc.
8.1.2 Relative humidity,
7.1.5 Apply test voltage to switch assembly for 60 s.
8.1.3 Barometric pressure,
7.1.6 Record visual changes or leakage current, or both, if
8.1.4 Specified dielectric withstand voltage (pass or fail),
any.
8.1.5 Circuit resistance pre and post (Dielectric Withstand
7.1.7 Dissipate all charges to ground using appropriate
Test),
methods prior to continuing test to next test voltage (repeat
8.1.6 C
...