Read JBL ON TOUR XT (serv.man5) EMC - CB Certificate online
12/05/2006
Report Number: 3109671ATL-005
Issued:
Intertek
Measurement of immunity to electrical transients (EN 55020 - Sec. 5.6)
5.0
Method:
Test equipment, test set-up and test procedure shall be according to IEC 61000-4-4, based on the use of a coupling/decoupling network.
The EUT’s shall be placed on a ground reference plane and shall be insulated from it by an insulating support 0.1 m ± 0.01 m thick.
In the case of table top equipment, the EUT should be located 0.8 m ± 0.08 m above the ground plane (see Figure 7).
The reference ground plane shall be a metallic sheet (copper or aluminium) of 0.25 mm minimum thickness; other metallic materials may be used but they
shall have 0.65 mm minimum thickness.
shall have 0.65 mm minimum thickness.
The minimum size of the ground plane is 1 m x 1 m. The actual size depends on the dimensions of the EUT.
The reference ground plane shall project beyond the EUT by at least 0.1 m on all sides.
The reference ground plane shall be connected to the protective earth ("ground" in US terminology).
The EUT shall be arranged and connected to satisfy its functional requirements, according to the equipment installation specifications.
The minimum distance between the EUT and all other conductive structures (e.g. the walls of a shielded room), except the ground plane beneath the EUT,
shall be more than 0.5 m.
shall be more than 0.5 m.
The EUT shall be connected to the earthing system in accordance with the manufacturer’s installation specifications; no additional earthing connections are
allowed.
allowed.
The connection of the test equipment ground cables to the ground reference plane and all bondings shall provide minimum inductance.
Coupling devices shall be used for the application of the test voltages. They shall be coupled to the lines between the EUT and the decoupling network or
between two units of equipment involved in the test.
between two units of equipment involved in the test.
Using the coupling clamp, the minimum distance between the coupling plates and all other conductive structures, except the ground plane beneath the
coupling clamp and beneath the EUT, shall be 0.5 m.
coupling clamp and beneath the EUT, shall be 0.5 m.
The length of the signal and power lines between the coupling device and the EUT shall be 1 m or less.
If the manufacturer provides a non-detachable supply cable more than 1 m long with the equipment, the excess length of this cable shall be gathered into a
flat coil with a 0.4 m diameter and situated at a distance of 0.1 m above the ground reference plane. The distance of 1 m or less between EUT and the
coupling device shall be maintained.
flat coil with a 0.4 m diameter and situated at a distance of 0.1 m above the ground reference plane. The distance of 1 m or less between EUT and the
coupling device shall be maintained.
The test voltage shall be applied to the following different types of lines or ports of the EUT:
Power supply ports: An example for the test set-up for direct coupling of the EFT/B disturbance voltage via a coupling/decoupling network is given in Figure
8. If the line current is higher than the specified current capability of the coupling/decoupling network, i.e. > 100 A, the test voltage shall be applied to the
EUT’s through a 33 nF coupling capacitor.
Power supply ports: An example for the test set-up for direct coupling of the EFT/B disturbance voltage via a coupling/decoupling network is given in Figure
8. If the line current is higher than the specified current capability of the coupling/decoupling network, i.e. > 100 A, the test voltage shall be applied to the
EUT’s through a 33 nF coupling capacitor.
I/O and communication ports: use the capacitive coupling clamp for application of the disturbance test voltage to I/O and communication ports.
Earth connections of the cabinets: The test point on the cabinet shall be the terminal for the protective earth conductor. The test voltage shall be applied to
the protective earth (PE) connection by the coupling/decoupling network.
the protective earth (PE) connection by the coupling/decoupling network.
Test on power supply ports and on protective earth terminals
Stationary, floor-mounted equipment: The test voltage shall be applied between a reference ground plane and each of the power supply terminals, a.c. or
d.c., and on the terminal for the protective or function earth on the cabinet of the EUT
Stationary, floor-mounted equipment: The test voltage shall be applied between a reference ground plane and each of the power supply terminals, a.c. or
d.c., and on the terminal for the protective or function earth on the cabinet of the EUT
A reference ground plane of approximately 1 m x 1 m shall be mounted near the EUT and connected to the protective earth conductor at the power supply
mains outlet.
mains outlet.
The EFT/B-generator shall be located on the reference plane. The length of the "hot wire" from the coaxial output of the EFT/B-generator to the terminals on
the EUT should not exceed 1 m. This connection shall be unshielded but well insulated. If a.c./d.c. blocking capacitors are necessary their capacitance shall
be 33 nF. All other connections of the EUT should be in accordance with its functional requirements.
the EUT should not exceed 1 m. This connection shall be unshielded but well insulated. If a.c./d.c. blocking capacitors are necessary their capacitance shall
be 33 nF. All other connections of the EUT should be in accordance with its functional requirements.
Non-stationary mounted EUT, connected to the mains supply by flexible cord and plugs: The test voltage shall be applied between each of the power supply
conductors and the protective earth at the power supply outlet to which the EUT is to be connected.
conductors and the protective earth at the power supply outlet to which the EUT is to be connected.
Test on I/O and communication ports
As far as possible, the capacitive coupling clamp shall be used for coupling the test voltage into the lines. However, if the clamp cannot be used due to
mechanical problems (size, cable routing) in the cabling, it may be replaced by a tape or a conductive foil enveloping the lines under test. The capacitance of
this coupling arrangement with foil or tape should be equivalent to that of the standard coupling clamp.
As far as possible, the capacitive coupling clamp shall be used for coupling the test voltage into the lines. However, if the clamp cannot be used due to
mechanical problems (size, cable routing) in the cabling, it may be replaced by a tape or a conductive foil enveloping the lines under test. The capacitance of
this coupling arrangement with foil or tape should be equivalent to that of the standard coupling clamp.
In other cases, it might be useful to couple the EFT/B-generator to the terminals of the lines via discrete 100 pF capacitors instead of the distributed
capacitance of the clamp or of the foil or tape arrangement.
capacitance of the clamp or of the foil or tape arrangement.
Grounding of the coaxial cable from the test generator shall be made in the vicinity of the coupling point. Application of the test voltage to the connectors (hot
wires) of coaxial or shielded communication lines is not permitted.
wires) of coaxial or shielded communication lines is not permitted.
Page 6 of 27
EMC Report for Harman Consumer Group on the JBL On Tour II
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