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ANSI/ESD-S20.20-1999
7.2. Assembly, Equipment and Design Hardening
7.2.1. Assembly, Equipment and Design Hardening Guidance:
Assemblies and equipment should have protective circuitry or techniques to meet the desired design
goals. Determining the ESD susceptibility of assemblies and equipment may be based on simulation
modeling, or actual testing. Table 3 provides a quick reference for various test methods associated with
assembly and equipment susceptibility testing.
7.2.2. Direct Contact, Non-Operating Assembly, Body/Finger or Hand/Metal Tests:
This model can be used to verify that assemblies will not be damaged during non-operating conditions by
direct contact to input, output and interface connections. This threat applies to all types of assemblies,
see Table 3.
7.2.3. Direct Contact Operating Equipment Hand/Metal Test:
This model can be used to verify that operating equipment will not be damaged (or non-recoverable faults
will not be injected) by direct contact to operator accessible points and exposed surface areas during the
normal maintenance process. This threat is limited to equipment subject to operator adjustments or
maintenance activities during operation, see Table 3.
7.2.4. Indirect Contact, Operating Equipment Furniture Model Test:
This model can be used to verify that operating equipment in a home or office environment will not be
damaged (or non-recoverable faults will not be injected) by indirect contact during normal activities
performed within the proximity of the equipment. This threat applies to all electronic equipment in a home
or office environment.
See
Table 3
Table 3 - ESD Susceptibility Test References for Assemblies and Equipment
ESD Assembly/Equipment Model
ESD Test Standard or Method
Body/Finger HBM
IEEE STD C62.38 (Sub-Assembly)
Hand/Metal HBM
IEC 1000-4-2
ANSI C63.16 (Equipment)
Furniture Model
ANSI C63.16 (Equipment)