JBL ON TOUR XT (serv.man5) EMC - CB Certificate ▷ View 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
12/05/2006
Report Number: 3109671ATL-005
Issued:
Intertek
Measurement of immunity to eletrostatic discharge (EN 55020 - Sec. 5.9)
8.0
Method:
When one or several metallic accessible parts are subject to the ESD test, the charge shall be removed from the point where the ESD pulse is to be applied,
as no guarantee can be given about the resistance between this and other accessible points on the product.
as no guarantee can be given about the resistance between this and other accessible points on the product.
A cable with 470 k-Ohm bleeder resistors, similar to the one used with the horizontal and vertical coupling planes, shall be used.
As the capacitance between EUT and HCP (tabletop) and between EUT and GRP (floor-standing) is determined by the size of the EUT, the cable with
bleeder resistors may remain installed during the ESD test when functionally allowed. In the discharge cable, one resistor shall be connected as close as
possible, preferably less than 20 mm from the EUT test point. The second resistor shall be connected near the end of the cable attached to the HCP for
tabletop equipment (see Figure 8), or GRP for floor-standing equipment.
bleeder resistors may remain installed during the ESD test when functionally allowed. In the discharge cable, one resistor shall be connected as close as
possible, preferably less than 20 mm from the EUT test point. The second resistor shall be connected near the end of the cable attached to the HCP for
tabletop equipment (see Figure 8), or GRP for floor-standing equipment.
The presence of the cable with the bleeder resistors can influence the test results of some equipment. In case of dispute, a test with the cable disconnected
during the ESD pulse takes precedence over the test with the cable installed during the test, provided that the charge has sufficiently decayed between the
successive discharges.
during the ESD pulse takes precedence over the test with the cable installed during the test, provided that the charge has sufficiently decayed between the
successive discharges.
As an alternative, the following options can be used:
- the time interval between successive discharges shall be extended to the time necessary to allow natural decay of the charge from the EUT;
- a carbon fibre brush with bleeder resistors (for example, 2 x 470 k-Ohm) in the grounding cable;
- an air-ionizer to speed-up the "natural" discharging process of the EUT to its environment. The ionizer shall be turned off when applying an air-discharge
test. The use of any alternative method shall be reported in the test report. NOTE In case of dispute concerning the charge decay, the charge on the EUT
can be monitored by a non-contacting electric field meter. When the charge has decayed below 10 % of the initial value, the EUT is considered to be
discharged.
- the time interval between successive discharges shall be extended to the time necessary to allow natural decay of the charge from the EUT;
- a carbon fibre brush with bleeder resistors (for example, 2 x 470 k-Ohm) in the grounding cable;
- an air-ionizer to speed-up the "natural" discharging process of the EUT to its environment. The ionizer shall be turned off when applying an air-discharge
test. The use of any alternative method shall be reported in the test report. NOTE In case of dispute concerning the charge decay, the charge on the EUT
can be monitored by a non-contacting electric field meter. When the charge has decayed below 10 % of the initial value, the EUT is considered to be
discharged.
The tip of the ESD generator shall be held normal (perpendicular) to the surface of the EUT.
Tabletop equipment: For tabletop equipment, the EUT is placed on the horizontal coupling plane on top of the insulating foil (0,5 mm thick). When a metallic
accessible part, to which the ESD pulse is to be applied, is available on the EUT, this part shall be connected to the HCP via the cable with bleeder resistors.
accessible part, to which the ESD pulse is to be applied, is available on the EUT, this part shall be connected to the HCP via the cable with bleeder resistors.
Floor-standing equipment: Floor-standing equipment without any metallic connection to the ground reference plane shall be installed similarly to 7.1.2 and
Figure 6 of EN 61000-4-2. A cable with bleeder resistors shall be used between the metallic accessible part, to which the ESD pulse is to be applied, and
the ground reference plane (GRP).
Figure 6 of EN 61000-4-2. A cable with bleeder resistors shall be used between the metallic accessible part, to which the ESD pulse is to be applied, and
the ground reference plane (GRP).
EXECUTION OF TESTS
The testing shall be performed by direct and indirect application of discharges to the EUT as appropriate.
The testing shall be performed by direct and indirect application of discharges to the EUT as appropriate.
Direct application of discharges to the EUT:
The static electricity discharges shall be applied only to those points and surfaces of the EUT which are accessible to persons during normal use. The
following exclusions apply (i.e. discharges are not applied to those items):
a) those points and surfaces which are only accessible under maintenance. In this case, special ESD mitigation procedures shall be given in the
accompanying documentation;
b) those points and surfaces which are only accessible under service by the (end-)user. Examples of these rarely accessed points are as follows: battery
contacts while changing batteries, a cassette in a telephone answering machine, etc.;
c) those points and surfaces of equipment which are no longer accessible after fixed installation or after following the instructions for use, for example, the
bottom and/or wall-side of equipment or areas behind fitted connectors;
d) the contacts of coaxial and multi-pin connectors which are provided with a metallic connector shell. In this case, contact discharges shall only be applied
to the metallic shell of that connector. Contacts within a non-conductive (for example, plastic) connector and which are accessible shall be tested by the air-
discharge test only. This test shall be carried out by using the rounded tip finger on the ESD generator.
e) those contacts of connectors or other accessible parts that are ESD sensitive because of functional reasons and are provided with an ESD warning label,
for example, r.f. inputs from measurement, receiving or other communication functions. Rationale: Many connector ports are designed to handle high-
frequency information, either analogue or digital, and therefore cannot be provided with sufficient overvoltage protection devices. In the case of
analogue signals, bandpass filters may be a solution. Overvoltage protecting diodes have too much stray capacitance to be useful at the frequencies at
which the EUT is designed to operate.
The static electricity discharges shall be applied only to those points and surfaces of the EUT which are accessible to persons during normal use. The
following exclusions apply (i.e. discharges are not applied to those items):
a) those points and surfaces which are only accessible under maintenance. In this case, special ESD mitigation procedures shall be given in the
accompanying documentation;
b) those points and surfaces which are only accessible under service by the (end-)user. Examples of these rarely accessed points are as follows: battery
contacts while changing batteries, a cassette in a telephone answering machine, etc.;
c) those points and surfaces of equipment which are no longer accessible after fixed installation or after following the instructions for use, for example, the
bottom and/or wall-side of equipment or areas behind fitted connectors;
d) the contacts of coaxial and multi-pin connectors which are provided with a metallic connector shell. In this case, contact discharges shall only be applied
to the metallic shell of that connector. Contacts within a non-conductive (for example, plastic) connector and which are accessible shall be tested by the air-
discharge test only. This test shall be carried out by using the rounded tip finger on the ESD generator.
e) those contacts of connectors or other accessible parts that are ESD sensitive because of functional reasons and are provided with an ESD warning label,
for example, r.f. inputs from measurement, receiving or other communication functions. Rationale: Many connector ports are designed to handle high-
frequency information, either analogue or digital, and therefore cannot be provided with sufficient overvoltage protection devices. In the case of
analogue signals, bandpass filters may be a solution. Overvoltage protecting diodes have too much stray capacitance to be useful at the frequencies at
which the EUT is designed to operate.
The test voltage shall be increased from the minimum to the selected test level, in order to determine any threshold of failure. The final test level should not
exceed the product specification value in order to avoid damage to the equipment.
exceed the product specification value in order to avoid damage to the equipment.
The test shall be performed with single discharges. On preselected points at least ten single discharges (in the most sensitive polarity) shall be applied.
For the time interval between successive single discharges an initial value of 1 s is recommended. Longer intervals may be necessary to determine whether
a system failure has occurred. NOTE The points to which the discharges should be applied may be selected by means of an exploration carried out at a
repetition rate of 20 discharges per second, or more.
a system failure has occurred. NOTE The points to which the discharges should be applied may be selected by means of an exploration carried out at a
repetition rate of 20 discharges per second, or more.
The ESD generator shall be held perpendicular to the surface to which the discharge is applied.
The discharge return cable of the generator shall be kept at a distance of at least 0.2 m from the EUT whilst the discharge is being applied.
In the case of contact discharges, the tip of the discharge electrode shall touch the EUT, before the discharge switch is operated.
In the case of painted surfaces covering a conducting substrate, the following procedure shall be adopted:
If the coating is not declared to be an insulating coating by the equipment manufacturer, then the pointed tip of the generator shall penetrate the coating so
as to make contact with the conducting substrate. Coating declared as insulating by the manufacturer shall only be submitted to the air discharge. The
contact discharge test shall not be applied to such surfaces.
If the coating is not declared to be an insulating coating by the equipment manufacturer, then the pointed tip of the generator shall penetrate the coating so
as to make contact with the conducting substrate. Coating declared as insulating by the manufacturer shall only be submitted to the air discharge. The
contact discharge test shall not be applied to such surfaces.
Page 22 of 27
EMC Report for Harman Consumer Group on the JBL On Tour II
12/05/2006
Report Number: 3109671ATL-005
Issued:
Intertek
Measurement of immunity to eletrostatic discharge (EN 55020 - Sec. 5.9)
8.0
Method:
In the case of air discharges, the round discharge tip of the discharge electrode shall be approached as fast as possible (without causing mechanical
damage) to touch the EUT. After each discharge, the ESD generator (discharge electrode) shall be removed from the EUT. The generator is then
retriggered for a new single discharge. This procedure shall be repeated until the discharges are completed. In the case of an air discharge test, the
discharge switch, which is used for contact discharge, shall be closed.
damage) to touch the EUT. After each discharge, the ESD generator (discharge electrode) shall be removed from the EUT. The generator is then
retriggered for a new single discharge. This procedure shall be repeated until the discharges are completed. In the case of an air discharge test, the
discharge switch, which is used for contact discharge, shall be closed.
Indirect application of the discharge:
Discharges to objects placed or installed near the EUT shall be simulated by applying the discharges of the ESD generator to a coupling plane, in the
contact discharge mode.
Discharges to objects placed or installed near the EUT shall be simulated by applying the discharges of the ESD generator to a coupling plane, in the
contact discharge mode.
Horizontal coupling plane (HCP) under the EUT:
Discharge to the HCP shall be made horizontally to the edge of the HCP. At least 10 single discharges (in the most sensitive polarity) shall be applied at the
front edge of each HCP opposite the centre point of each unit (if applicable) of the EUT and 0.1 m from the front of the EUT. The long axis of the discharge
electrode shall be in the plane of the HCP and perpendicular to its front edge during the discharge. The discharge electrode shall be in contact with the
edge of the HCP. In addition, consideration should be given to exposing all sides of the EUT to this test.
Discharge to the HCP shall be made horizontally to the edge of the HCP. At least 10 single discharges (in the most sensitive polarity) shall be applied at the
front edge of each HCP opposite the centre point of each unit (if applicable) of the EUT and 0.1 m from the front of the EUT. The long axis of the discharge
electrode shall be in the plane of the HCP and perpendicular to its front edge during the discharge. The discharge electrode shall be in contact with the
edge of the HCP. In addition, consideration should be given to exposing all sides of the EUT to this test.
Vertical coupling plane:
At least 10 single discharges (in the most sensitive polarity) shall be applied to the centre of one vertical edge of the coupling plane. The coupling plane, of
dimensions 0.5 m x 0.5 m, is placed parallel to, and positioned at a distance of 0.1 m from, the EUT. Discharges shall be applied to the coupling plane, with
sufficient different positions such that the four faces of the EUT are completely illuminated.
At least 10 single discharges (in the most sensitive polarity) shall be applied to the centre of one vertical edge of the coupling plane. The coupling plane, of
dimensions 0.5 m x 0.5 m, is placed parallel to, and positioned at a distance of 0.1 m from, the EUT. Discharges shall be applied to the coupling plane, with
sufficient different positions such that the four faces of the EUT are completely illuminated.
Description:
Manufacturer:
Model:
Asset Number:
Cal Date:
Cal Due:
Test Equipment Used:
Digital Pocket Weathermeter
Mannix
SAM700BAR
211896
10/13/2006
10/13/2007
Electrostatic Discharge Gun (ESD)
NoiseKen
TC-815P
200068
06/06/2006
06/06/2007
Electrostatic Discharge Simulator (ESD)
Noiseken
ESS-200AX
014450
06/06/2006
06/06/2007
Vertical Coupling Plane
ITS
ESD-VCP
213119
VBU
VBU
Results: The sample tested was found to Comply.
Page 23 of 27
EMC Report for Harman Consumer Group on the JBL On Tour II
12/05/2006
Report Number: 3109671ATL-005
Issued:
Intertek
Measurement of immunity to eletrostatic discharge (EN 55020 - Sec. 5.9)
8.0
ESD Test Setup
Photo:
Page 24 of 27
EMC Report for Harman Consumer Group on the JBL On Tour II
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