ASTM F1662-03

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Designation: F 1662 – 03
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 F 1662; 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 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.
F 1680 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,
F 1663 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
5. Interferences
test points or between an insulated test point and ground, which
results in no visual change or specified leakage current.
5.1 The following parameters may affect the results of this
3.1.2 dielectric breakdown voltage—the voltage at which a
test:
disruptive discharge or excessive leakage current occurs. 5.1.1 Humidity,
3.1.3 disruptive discharge—flashover (surface discharge),
5.1.2 Contamination,
spark over (air discharge), or breakdown (puncture discharge). 5.1.3 Barometric pressure, and
3.1.4 leakage current—current between mutually insulated
5.1.4 Temperature.
test points when a voltage is applied.
6. Apparatus
3.1.5 membrane switch—a momentary switching device in
which at least one contact is on, or made of, a flexible 6.1 Electric Device, suitable to provide a controlled dc
substrate. voltage, leakage current measurement.
3.1.6 test points—two preselected mutually insulated loca-
7. Procedure
tions on switch assembly.
7.1 Dielectric Withstand Test Method:
7.1.1 Measure and record the following characteristics prior
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This test method is under the jurisdiction of ASTM Committee F01 on
to performing test:
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
7.1.1.1 Open and closed circuit resistance of the test points
Switches.
in accordance with Test Method F 1680.
Current edition approved June 10, 2003. Published August 2003 Originally
approved in 1995 as F 1662-95. Last previous edition approved in 1995 as
7.1.1.2 Capacitance of the test point in accordance with
F 1662-95(02).
F 1663.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1.2 Connect two test points on the switch assembly, each
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on to a separate polarity, on the voltage source.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F 1662 – 03
7.1.3 Select test voltage from Table 1. 7.2.4 Dissipate all charges to ground using appropriate
7.1.4 Apply the test voltage from zero to specified value as methods prior to continuing test to next test voltage (repeat
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uniformly as possible, at a rate of approximately ⁄2 of the test 7.2.2 to 7.2.3 as needed).
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 8. Report
voltage of 500 V dc.
8.1 Report the following information:
7.1.5 Apply test voltage to switch assembly for 60 s.
8.1.1 Temperature,
7.1.6 Record visual changes or leakage current, or both, if
8.1.2 Relative humidity,
any.
8.1.3 Barometric pressure,
7.1.7 Dissipate all charges to ground using appropriate
8.1.4 Specified dielectric withstand voltage (pass or fail),
methods prior to continuing test to next test voltage (repeat
8.1.5 Circuit resistance pre and post (Dielectric Withstand
7.1.3 to 7.1.7 as needed).
Test),
7.1.8 Repeat measurement
...