|
|
|
|
Magnetic Field TEST SETUP From: 61000-4-8 . IEC:1993 +A1:2000 7 Test set-up The test set-up comprises the following components: . ground (reference) plane (GRP); . equipment under test (EUT); . induction coil; . test generator. Precautions shall be taken if the test magnetic field may interfere with the test instrumentation and other sensitive equipment in the vicinity of the test set-up. Examples of test set-ups are given in the following figures: Figure 3: Example of test set-up for table-top equipment
Figure 4: Example of test set-up for floor-standing equipment
7.1 Ground (reference) plane The ground plane (GRP) shall be placed in the laboratory; the EUT and auxiliary test equipment shall be placed on it and connected to it. The ground plane shall be a non-magnetic metal sheet (copper or aluminium) of 0,25 mm thickness; other metals may be used but in this case they shall have 0,65 mm minimum thickness. The minimum size of the ground plane is 1 m × 1 m. The final size depends on the dimensions of the EUT. The ground plane shall be connected to the safety earth system of the laboratory. 7.2 Equipment under test The equipment is configured and connected to satisfy its functional requirements. It shall be placed on the GRP with the interposition of a 0,1 m thickness insulating support (e.g. dry wood). The equipment cabinets shall be connected to the safety earth directly on the GRP via the earth terminal of the EUT. The power supply, input and output circuits shall be connected to the sources of power supply, control and signal. The cables supplied or recommended by the equipment manufacturer shall be used. In absence of any recommendation, unshielded cables shall be adopted, of a type appropriate for the signals involved. All cables shall be exposed to the magnetic field for 1 m of their length. The back filters, if any, shall be inserted in the circuits at 1 m cable lengths from the EUT and connected to the ground plane. The communication lines (data lines) shall be connected to the EUT by the cables given in the technical specification or standard for this application. 7.3 Test generator The test generator shall be placed at less than 3 m distance from the induction coil. One terminal of the generator shall be connected to the ground plane as far as used. 7.4 Induction coil The induction coil, of the type specified in 6.2.1, shall enclose the EUT placed at its centre. Different induction coils may be selected for testing in the different orthogonal directions, according to the general criteria specified in 6.2.1 a) and b). Induction coils used in the vertical position (horizontal polarization of the field) can be bonded (at the foot of one vertical conductor) directly to the ground plane, which represents the low side of the coil, as a part of it. In this case, 0,1 m minimum distance from EUT to the ground plane is sufficient. The induction coil shall be connected to the test generator in the same way as for the calibration procedure specified in 6.2.2. The induction coil selected for the tests shall be specified in the test plan. |
|
Send mail to web@atlasce.com with questions or comments about this
web site.
|
