Read JBL ON TOUR XT (serv.man5) EMC - CB Certificate online
12/05/2006
Report Number: 3109671ATL-005
Issued:
Intertek
Measurement of immunity to eletrostatic discharge (EN 55020 - Sec. 5.9)
8.0
Method:
The test set-up consists of the test generator, EUT and auxiliary instrumentation necessary to perform direct and indirect application of discharges to the
EUT in the following manner:
a) contact discharge to the conductive surfaces and to coupling planes;
b) air discharge at insulating surfaces.
EUT in the following manner:
a) contact discharge to the conductive surfaces and to coupling planes;
b) air discharge at insulating surfaces.
The EUT shall be arranged in accordance with the manufacturer’s instructions for installation (if any).
In the case of air discharge testing, the climatic conditions shall be within the following ranges:
- ambient temperature: 15° C to 35° C;
- relative humidity: 30 % to 60 %;
- atmospheric pressure: 86 kPa (860 mbar) to 106 kPa (1 060 mbar).
NOTE Any other values are specified in the product specification. The EUT shall be operated within its intended climatic conditions.
- ambient temperature: 15° C to 35° C;
- relative humidity: 30 % to 60 %;
- atmospheric pressure: 86 kPa (860 mbar) to 106 kPa (1 060 mbar).
NOTE Any other values are specified in the product specification. The EUT shall be operated within its intended climatic conditions.
GENERAL SETUP
A ground reference plane shall be provided on the floor of the laboratory. It shall be a metallic sheet (copper or aluminium) of 0.25 mm minimum thickness;
other metallic materials may be used but they shall have at least 0.65 mm minimum thickness.
A ground reference plane shall be provided on the floor of the laboratory. It shall be a metallic sheet (copper or aluminium) 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 size of the reference plane is 1 m^2, the exact size depending on the dimensions of the EUT. It shall project beyond the EUT or coupling
plane by at least 0.5 m on all sides, and shall be connected to the protective grounding system.
plane by at least 0.5 m on all sides, and shall be connected to the protective grounding system.
Local safety regulations shall always be met.
The EUT shall be arranged and connected according to its functional requirements.
A distance of 1 m minimum shall be provided between the equipment under test and the walls of the laboratory and any other metallic structure.
The EUT shall be connected to the grounding system, in accordance with its installation specifications. No additional grounding connections are allowed.
The positioning of the power and signal cables shall be representative of installation practice.
The discharge return cable of the ESD generator shall be connected to the ground reference plane. The total length of this cable is in general 2 m.
In cases where this length exceeds the length necessary to apply the discharges to be selected points, 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.
In cases where this length exceeds the length necessary to apply the discharges to be selected points, 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 connection of the earth cables to the ground reference plane and all bondings shall be of low impedance, for example by using clamping devices for
high frequency applications.
high frequency applications.
Where coupling planes are specified, for example to allow indirect application of the discharge, they shall be constructed from the same material type and
thickness as that of the ground reference plane, and shall be connected to the GRP via a cable with a 470 kOhm resistor located at each end. These
resistors shall be capable of withstanding the discharge voltage and shall be insulated to avoid short circuits to the GRP when the cable lies on the GRP.
thickness as that of the ground reference plane, and shall be connected to the GRP via a cable with a 470 kOhm resistor located at each end. These
resistors shall be capable of withstanding the discharge voltage and shall be insulated to avoid short circuits to the GRP when the cable lies on the GRP.
TABLETOP EQUIPMENT
The test set-up shall consist of a wooden table, 0.8 m high, standing on the ground reference plane.
The test set-up shall consist of a wooden table, 0.8 m high, standing on the ground reference plane.
A horizontal coupling plane (HCP), 1.6 m x 0.8 m, shall be placed on the table. The EUT and cables shall be isolated from the coupling plane by an
insulating support 0.5 mm thick.
insulating support 0.5 mm thick.
If the EUT is too large to be located 0.1 m minimum from all sides of the HCP, an additional, identical HCP shall be used, placed 0.3 m from the first, with
the short sides adjacent. The table has to be enlarged or two tables may be used. The HCPs shall not be bonded together, other than via resistive cables to
the GRP.
the short sides adjacent. The table has to be enlarged or two tables may be used. The HCPs shall not be bonded together, other than via resistive cables to
the GRP.
Any mounting feet associated with the EUT shall remain in place.
FLOOR STANDING EQUIPMENT
The EUT and cables shall be isolated from the ground reference plane by an insulating support about 0.1 m thick.
The EUT and cables shall be isolated from the ground reference plane by an insulating support about 0.1 m thick.
Any mounting feet associated with the EUT shall remain in place.
TEST METHOD FOR UNGROUNDED EQUIPMENT
The test method described in this subclause is applicable to equipment or part(s) of equipment whose installation specifications or design preclude
connection to any grounding system. Equipment, or parts thereof, includes portable, battery-operated and double-insulated equipment (class II equipment).
Rationale: Ungrounded equipment, or ungrounded part(s) of equipment, cannot discharge itself similarly to class I mains-supplied equipment. If the charge
is not removed before the next ESD pulse is applied, it is possible that the EUT or part(s) of the EUT be stressed up to twice the intended test voltage.
Therefore, double-insulated equipment could be charged at an unrealistically high charge, by accumulating several
ESD discharges on the capacitance of the class II insulation, and then discharge at the breakdown voltage of the insulation with a much higher energy.
The test method described in this subclause is applicable to equipment or part(s) of equipment whose installation specifications or design preclude
connection to any grounding system. Equipment, or parts thereof, includes portable, battery-operated and double-insulated equipment (class II equipment).
Rationale: Ungrounded equipment, or ungrounded part(s) of equipment, cannot discharge itself similarly to class I mains-supplied equipment. If the charge
is not removed before the next ESD pulse is applied, it is possible that the EUT or part(s) of the EUT be stressed up to twice the intended test voltage.
Therefore, double-insulated equipment could be charged at an unrealistically high charge, by accumulating several
ESD discharges on the capacitance of the class II insulation, and then discharge at the breakdown voltage of the insulation with a much higher energy.
To simulate a single ESD event (either by air or by contact discharge), the charge on the EUT shall be removed prior to each applied ESD pulse.
The charge on the metallic point or part to which the ESD pulse is to be applied, for example, connector shells, battery charge pins, metallic antennae, shall
be removed prior to each applied ESD test pulse.
be removed prior to each applied ESD test pulse.
Page 21 of 27
EMC Report for Harman Consumer Group on the JBL On Tour II
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