EMS61000-2A User’s Manual
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Chapter7 Set-up in laboratory
7.1 Test set-up in laboratories
A ground reference plane shall be provided on the floor of the laboratory. It shall be a
metallic sheet (copper or aluminum) of 0.25 mm minimum thickness; other metallic
materials may be used but they shall have at least 0.65 mm minimum thickness. The
minimum area of the reference plane is 1 m
2
, the exact size depends on the
dimensions of the EUT. It shall project beyond the EUT or coupling plate by at least
0.5 m on all sides, and shall be connected to the protective grounding system.
The EUT shall be arranged and connected according to its functional requirements.
The distance between the EUT and the walls of the laboratory and any other metallic
structure should be larger than 1 m. The EUT shall be connected to the grounding
system, in accordance with its installation specifications. No additional grounding
connections are allowed. The layout of the power and signal cables shall be
representative of the practice installation. The discharge loop cable of the ESD
generator shall be connected to the ground reference plane. Its length is in general 2 m.
In cases this length exceeds the needed length, the excess length shall, where possible,
be placed non-inductively off the ground reference plane and shall not come closer
than 0.2 m to other conductive parts in the test set-up. The earth cables connected to
the ground reference plane and all bondings shall be low impedance, for example,
using clamp devices for high frequency applications. Where coupling plates are
specified, its material type and thickness should agree with the ground reference plane,
and shall be connected to the grounding reference panel via a cable with a 470 kΩ
resistor located at each end. These resistors shall be capable of withstanding the
discharge voltage and shall be well insulated to avoid short circuits to the grounding
reference plane.
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