ASTM F1812-09
(Test Method)Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding
Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding
SIGNIFICANCE AND USE
Nearly all electronic devices are susceptible to possible damage or degradation from ESD encountered in their operating environments. The sensitivity of the equipment, the potential consequences of a malfunction, and the expected environmental conditions all impact the level of ESD protection needed.
ESD shielding effectiveness test may be destructive, and units that have been tested should be considered unreliable for future use.
SCOPE
1.1 This test method is used to determine the electrostatic discharge (ESD) shielding effectiveness of a membrane switch assembly. This test method may be used to test a membrane switch to destruction, that is, to determine its maximum ESD shielding effectiveness, or it may be used to test the ability of a membrane switch to withstand a predetermined level of exposure.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use..
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Designation: F1812 − 09
StandardTest Method for
Determining the Effectiveness of Membrane Switch ESD
1
Shielding
This standard is issued under the fixed designation F1812; 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 3.2 ESD shielding effectiveness test may be destructive, and
units that have been tested should be considered unreliable for
1.1 This test method is used to determine the electrostatic
future use.
discharge (ESD) shielding effectiveness of a membrane switch
assembly. This test method may be used to test a membrane
4. Interferences
switch to destruction, that is, to determine its maximum ESD
shielding effectiveness, or it may be used to test the ability of
4.1 The following parameters may affect the results of this
a membrane switch to withstand a predetermined level of test:
exposure.
4.1.1 Temperature may affect the tendency of an ESD event
to occur,
1.2 The values stated in SI units are to be regarded as the
4.1.2 Relative humidity may affect the tendency of an ESD
standard. The values given in parentheses are for information
event to occur,
only.
4.1.3 Barometric pressure may affect the tendency of an
1.3 This standard does not purport to address all of the
ESD event to occur, and
safety concerns, if any, associated with its use. It is the
4.1.4 The composition of the work bench may influence the
responsibility of the user of this standard to establish appro-
test results.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
2. Terminology 5.1 Discharge Probe.
5.2 ESD Simulator—Commercially available device for ap-
2.1 Definitions:
2.1.1 discharge pulse count—number of applied discharges. plying required or specified voltages, monitoring for ESD
event and selecting various voltage levels, and probes for
2.1.2 discharge pulse interval—time duration between ap-
contact or air discharge.
plied voltage.
2.1.3 ESD (electrostatic discharge) event—detection of ap-
6. Procedure: Direct Application of Discharge
plied charge at input/output (I/O) points.
6.1 Pretest Setup:
2.1.4 I/O points—specified conductive area, location, or
6.1.1 Place switch on a nonconductive surface, or as speci-
circuitry, typically all circuit paths, traces and wires.
fied.
6.1.2 If applicable, connect the ESD shield, ground trace, or
3. Significance and Use
ground plane to earth ground.
3.1 Nearly all electronic devices are susceptible to possible
6.1.3 Connect all circuitry pin inputs or outputs to the ESD
damage or degradation from ESD encountered in their operat-
generating device’s ground.
ing environments. The sensitivity of the equipment, the poten-
6.1.4 Ambient laboratory conditions to be within:
tial consequences of a malfunction, and the expected environ-
6.1.4.1 Relative humidity 30 to 60 %,
mental conditions all impact the level of ESD protection
6.1.4.2 Temperature 15 to 35°C, and
needed.
6.1.4.3 Atmospheric pressure 680 to 1060 mbar or other-
wise specified.
1
6.2 In Process:
This test method is under the jurisdiction of ASTM Committee F01 on
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
6.2.1 Accumulation of charge on the membrane switch must
Switches.
be dissipated between successive tests.
Current edition approved June 15, 2009. Published August 2009. Originally
6.2.2 Set the initial voltage level to 2Kv. Set discharge pulse
approved in 1997. Last previous edition approved in 2002 as F1812-02. DOI:
10.1520/F1812-09. interval as specified.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1812 − 09
6.2.3 Place discharge tip perpendicular, and in contact, with 7.3 If no ESD event occurs, discharge accumulated voltage
switch surface at the specified point. on surface to earth ground.
6.2.4 Trigger the ESD discharge and monitor. 7.3.1 Reset and increase test voltage to next level in
6.2.5 Check the ESD discharge event to I/O points. accordance with Table 1 ( or as specified). Repeat 7.2.1-7.4.
6.2.6 If no ESD event occurs, discharge accumulated volt-
7.4 If ESD discharge event is noted, report and terminate
age on surface to earth ground.
test.
6.2.7 Reset and increase test voltage to next level in
7.5 Repeat 7.1.1-7.1.4 for other test points.
accordance with Table 1 (or as specified). Repeat 6.2.3-6.3.
6.3 If ESD discharge event is noted, report and terminate 8. Report
test.
8.1 Report the following information:
6.4 Repeat 6.2.1-6.3 for other test points. 8.1.1 Humidity,
8.
...
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:F1812–02 Designation:F1812–09
Standard Test Method for
Determining the Effectiveness of Membrane Switch ESD
1
Shielding
This standard is issued under the fixed designation F 1812; 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 is used to determine the electrostatic discharge (ESD) shielding effectiveness of a membrane switch
assembly.This test method may be used to test a membrane switch to destruction, that is, to determine its maximum ESD shielding
effectiveness, or it may be used to test the ability of a membrane switch to withstand a predetermined level of exposure.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Terminology
2.1 Definitions:
2.1.1 discharge pulse count—number of applied discharges.
2.1.2 discharge pulse interval—time duration between applied voltage.
2.1.3 ESD (electrostatic discharge) event—detection of applied charge at input/output (I/O) points.
2.1.4 I/O points—specified conductive area, location, or circuitry, typically all circuit paths, traces and wires.
3. Significance and Use
3.1 Nearly all electronic devices are susceptible to possible damage or degradation from ESD encountered in their operating
environments. The sensitivity of the equipment, the potential consequences of a malfunction, and the expected environmental
conditions all impact the level of ESD protection needed.
3.2 ESD shielding effectiveness test may be destructive, and units that have been tested should be considered unreliable for
future use.
4. Interferences
4.1 The following parameters may affect the results of this test:
4.1.1 Temperature may affect the tendency of an ESD event to occur,
4.1.2 Relative humidity may affect the tendency of an ESD event to occur,
4.1.3 Barometric pressure may affect the tendency of an ESD event to occur, and
4.1.4 The composition of the work bench may influence the test results.
5. Apparatus
5.1 Discharge Probe.
5.2 ESD Simulator—Commercially available device for applying required or specified voltages, monitoring for ESD event and
selecting various voltage levels, and probes for contact or air discharge.
6. Procedure: Direct Application of Discharge
6.1 Pretest Setup:
6.1.1 Place switch on a nonconductive surface, or as specified.
6.1.2 If applicable, connect the ESD shield, ground trace, or ground plane to earth ground.
6.1.3 Connect all circuitry pin inputs or outputs to the ESD generating device’s ground.
6.1.4 Ambient laboratory conditions to be within:
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 Dec. 10, 2002. Published February 2003. Originally approved in 1997. Last previous edition approved in 1997 as F1812–97a.
Current edition approved June 15, 2009. Published August 2009. Originally approved in 1997. Last previous edition approved in 2002 as F 1812-02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F1812–09
6.1.4.1 Relative humidity 30 to 60 %,
6.1.4.2 Temperature 15 to 35°C, and
6.1.4.3 Atmospheric pressure 680 to 1060 mbar or otherwise specified.
6.2 In Process:
6.2.1 Accumulation of charge on the membrane switch must be dissipated between successive tests.
6.2.2 Set the initial voltage level to 2Kv. Set discharge pulse interval as specified.
6.2.3 Place discharge tip perpendicular, and in contact, with switch surface at the specified point.
6.2.4 Trigger the ESD discharge and monitor.
6.2.5 Check the ESD discharge event to I/O points.
6.2.6 If no ESD event occurs, discharge accumulated voltage on surface to earth ground.
6.2.7 Reset and increase test voltage to next level in accordance with Table 1 (or as specified). Repeat 6.2.3-6.3.
6.3 If ESD discharge event is noted, report and terminate test.
6.4 Repeat 6.2.1-6.3 f
...
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:F1812–02 Designation:F1812–09
Standard Test Method for
Determining the Effectiveness of Membrane Switch ESD
1
Shielding
This standard is issued under the fixed designation F 1812; 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 is used to determine the electrostatic discharge (ESD) shielding effectiveness of a membrane switch
assembly.This test method may be used to test a membrane switch to destruction, that is, to determine its maximum ESD shielding
effectiveness, or it may be used to test the ability of a membrane switch to withstand a predetermined level of exposure.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Terminology
2.1 Definitions:
2.1.1 discharge pulse count—number of applied discharges.
2.1.2 discharge pulse interval—time duration between applied voltage.
2.1.3 ESD (electrostatic discharge) event—detection of applied charge at input/output (I/O) points.
2.1.4 I/O points—specified conductive area, location, or circuitry, typically all circuit paths, traces and wires.
3. Significance and Use
3.1 Nearly all electronic devices are susceptible to possible damage or degradation from ESD encountered in their operating
environments. The sensitivity of the equipment, the potential consequences of a malfunction, and the expected environmental
conditions all impact the level of ESD protection needed.
3.2 ESD shielding effectiveness test may be destructive, and units that have been tested should be considered unreliable for
future use.
4. Interferences
4.1 The following parameters may affect the results of this test:
4.1.1 Temperature may affect the tendency of an ESD event to occur,
4.1.2 Relative humidity may affect the tendency of an ESD event to occur,
4.1.3 Barometric pressure may affect the tendency of an ESD event to occur, and
4.1.4 The composition of the work bench may influence the test results.
5. Apparatus
5.1 Discharge Probe.
5.2 ESD Simulator—Commercially available device for applying required or specified voltages, monitoring for ESD event and
selecting various voltage levels, and probes for contact or air discharge.
6. Procedure: Direct Application of Discharge
6.1 Pretest Setup:
6.1.1 Place switch on a nonconductive surface, or as specified.
6.1.2 If applicable, connect the ESD shield, ground trace, or ground plane to earth ground.
6.1.3 Connect all circuitry pin inputs or outputs to the ESD generating device’s ground.
6.1.4 Ambient laboratory conditions to be within:
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 Dec. 10, 2002. Published February 2003. Originally approved in 1997. Last previous edition approved in 1997 as F1812–97a.
Current edition approved June 15, 2009. Published August 2009. Originally approved in 1997. Last previous edition approved in 2002 as F 1812-02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F1812–09
6.1.4.1 Relative humidity 30 to 60 %,
6.1.4.2 Temperature 15 to 35°C, and
6.1.4.3 Atmospheric pressure 680 to 1060 mbar or otherwise specified.
6.2 In Process:
6.2.1 Accumulation of charge on the membrane switch must be dissipated between successive tests.
6.2.2 Set the initial voltage level to 2Kv. Set discharge pulse interval as specified.
6.2.3 Place discharge tip perpendicular, and in contact, with switch surface at the specified point.
6.2.4 Trigger the ESD discharge and monitor.
6.2.5 Check the ESD discharge event to I/O points.
6.2.6 If no ESD event occurs, discharge accumulated voltage on surface to earth ground.
6.2.7 Reset and increase test voltage to next level in accordance with Table 1 (or as specified). Repeat 6.2.3-6.3.
6.3 If ESD discharge event is noted, report and terminate test.
6.4 Repeat 6.2.1-6.3 f
...
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