Name: ASTM F1812-97a - Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding
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Abstract

Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding

SCOPE
1.1 This test method to determine the electrostatic static 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.

General Information

Status

Historical

Publication Date

09-Dec-1997

ICS

31.220.20 - Switches

Technical Committee

F01 - Electronics

Drafting Committee

F01.18 - Printed Electronics

Current Stage

Ref Project

Relations

Replaced By

ASTM F1812-02 - Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding

Effective Date

10-Dec-2002

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ASTM F1812-97a - Standard Test Method for Determining the Effectiveness of Membrane Switch ESD Shielding

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Standards Content (Sample)

ASTM F1812-97a - Standard Test...

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact
ASTM International (www.astm.org) for the latest information.
Designation: F 1812 – 97a
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Interferences
1.1 This test method is used to determine the electrostatic 4.1 The following parameters may affect the results of this
static discharge (ESD) shielding effectiveness of a membrane test:
switch assembly. This test method may be used to test a 4.1.1 Temperature may affect the tendancy of an ESD event
membrane switch to destruction, that is, to determine its to occure,
maximum ESD shielding effectiveness, or it may be used to 4.1.2 Relative humidity may affect the tendancy of an ESD
test the ability of a membrane switch to withstand a predeter- event to occure,
mined level of exposure. 4.1.3 Barometric pressure may affect the tendancy of an
1.2 The values stated in SI units are to be regarded as the ESD event to occure, and
standard. The values given in parentheses are for information 4.1.4 The composition of the work bench may inﬂuence the
only. test results.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.1 Discharge Probe.
5.2 ESD Simulator—Commercially available device for
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. applying required or speciﬁed voltages, monitoring for ESD
event and selecting various voltage levels, and probes for
2. Terminology
contact or air discharge.
2.1 Deﬁnitions:
6. Procedure: Direct Application of Discharge
2.1.1 discharge pulse count—number of applied discharges.
2.1.2 discharge pulse interval—time duration between ap- 6.1 Pretest Setup:
6.1.1 Place switch on a nonconductive surface, or as speci-
plied voltage.
2.1.3 ESD (electrostatic static discharge) event—detection ﬁed.
6.1.2 If applicable, connect the ESD shield, ground trace, or
of applied charge at input/output (I/O) points.
2.1.4 I/O points—speciﬁed conductive area, location, or ground plane to earth ground.
6.1.3 Connect all circuitry pin inputs or outputs to the ESD
circuitry, typically all circuit paths, traces and wires.
generating device’s ground.
3. Signiﬁcance and Use
6.1.4 Ambient laboratory conditions to be within:
3.1 Nearly all electronic devices are susceptible to possible 6.1.4.1 Relative humidity 30 to 60 %,
damage or degradation from ESD encountered in their operat- 6.1.4.2 Temperature 15 to 35°C, and
ing environments. The sensitivity of the equipment, the poten- 6.1.4.3 Atmospheric pressure 680 to 1060 mbar or other-
tial consequences of a malfunction, and the expected environ- wise speciﬁed.
mental conditions all impact the level of ESD protection 6.2 In Process:
needed. 6.2.1 Accumulation of charge on the membrane switch must
3.2 ESD shielding effectiveness test may be destructive, and be dissipated between successive tests.
units that have been tested should be considered unreliable for 6.2.2 Set the initial voltage level to 2Kv. Set discharge pulse
future use. interval as speciﬁed.
6.2.3 Place discharge tip perpendicular, and in contact, with
switch surface at the speciﬁed point.
1
6.2.4 Trigger the ESD discharge and monitor.
This test method is under the jurisdiction of ASTM Committee F-1 on
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
6.2.5 Check the ESD discharge event to I/O points.
Switches.
6.2.6 If no ESD event occurs, discharge accumulated volt-
Current edition approved Dec. 10, 1997. Published September 1998. Originally
age on surface to earth ground.
published as F 1812-97. Last previous edition F 1812–97.
1

---------------------- Page: 1 ----------------------
NOTICE:¬This¬standard¬has¬either¬been¬superceded¬and¬replaced¬by¬a¬new¬version¬or¬discontinued.¬
Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
F 1812
6.2.7 Reset and increase test voltage to next level in 7.3 If no ESD event occurs, discharge accumulated voltage
accordance with Table 1 (or as speciﬁed). Repeat 6.2.3-6.3. on surface to earth ground.
6.3 If ESD discharge event is noted, report and terminate 7.3.1 Reset and increase test voltage to next level in
test. accordance with Table1(oras speciﬁed). Repeat 7.2.1-7.4.
6.4 Repeat 6.2.1-6.3 for other
...

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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.
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