ASTM F1689-96
(Test Method)Standard Test Method for Determining the Insulation Resistance of a Membrane Switch
Standard Test Method for Determining the Insulation Resistance of a Membrane Switch
SCOPE
1.1 This test method covers the determination of the insulation resistance 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 responsibilty 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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: F 1689 – 96
Standard Test Method for
Determining the Insulation Resistance of a Membrane
Switch
This standard is issued under the fixed designation F 1689; 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. Interferences
1.1 This test method covers the determination of the insu- 4.1 The following parameters may affect the result of this
lation resistance of a membrane switch. test:
1.2 This standard does not purport to address all of the 4.1.1 Humidity,
safety concerns, if any, associated with its use. It is the 4.1.2 Contamination,
responsibility of the user of this standard to establish appro- 4.1.3 Barometric pressure, and
priate safety and health practices and determine the applica- 4.1.4 Temperature.
bility of regulatory limitations prior to use.
5. Apparatus
2. Terminology
5.1 Electric Device, suitable to provide a constant prese-
2.1 Definitions: lected dc voltage and suitable electronic monitoring device to
2.1.1 insulation resistance—the electrical resistance be- measure very small current levels (micro-ampere range).
tween test points. or
2.1.2 leakage current—current flow through the insulation 5.2 Resistance Measuring Device, such as a megohm-meter,
between test points. or equivalent that can provide a specified voltage. (This would
2.1.3 membrane switch—a momentary switching device in replace 5.1.)
which at least one contact is on, or made of, a flexible
6. Procedure—Voltage Source Method (Fig. 1)
substrate.
2.1.4 test points—two preselected mutually insulated loca- 6.1 Pretest Setup:
6.1.1 Connect test points of the switch assembly to the
tions on switch assembly.
voltage source.
3. Significance and Use
6.1.2 Connect leakage current measuring device in series
3.1 Insulation resistance is useful for design verification, with the voltage source.
quality control of materials, and workmanship. 6.2 In-Process Test:
3.2 Low insulation resistance can cause high leakage cur- 6.2.1 Adjust voltage source to specified levels and record
rents. leakage current if detectable. If leakage current was undetect-
3.3 High leakage currents can lead to deterioration of the able, record as the smallest increment on current meter.
insulation or false triggering of the associated input device, or
7. Procedure—Megohm Method (Fig. 2)
both.
7.1 Pretest Setup:
3.4 Specific areas of testing are, but not limited to:
3.4.1 Conductor/dielectric/conductor crossing point. 7.1.1 Connect test points of the switch assembly to the
megohm-meter.
3.4.2 Close proximity of conductors, and
3.4.3 Any other conductive sur
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