EN 61000-4-4-2012 pdf download.Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement techniques – Electrical fast transientlburst immunity test.
A ground reference plane as described in 7.3.1 shall be mounted near the ELJT and connected to the protective earth conductor at the power mains.
The EFTIB generator shall be located on the ground reference plane and connected to the coupling capacitor(s) by a coaxial cable. The shield of the coaxial cable shall not be connected at the capacitor end. The length of the connection from the coupling capacitor to the ports on the EUT shall be as short as possible. This connection shall be unshielded but well insulated. Coupling capacitors shall have a value of (33 ± 6,6) nF. All other connections of the EUT should be in accordance with its functional requirements.
7.4.3 Test on signal and control ports
The capacitive coupling clamp is the preferred method for coupling the test voltage into signal and control ports. The cable shall be placed in the centre of the coupling clamp. If the clamp cannot be used due to mechanical reasons (e.g. size, cable routing) in the cabling, it shall be replaced by a tape or a conductive foil enveloping the lines under test.
An alternative method is to couple the EFTIB generator to the terminals of the lines via discrete (100 ± 20) pF capacitors instead of the distributed capacitance of the clamp or of the foil or tape arrangement.
Earthing 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 lines is not permitted.
The test voltage should be applied in a way that the shielding protection of the equipment is not reduced (see Figure 16 for the test configuration).
— the evaluation of the test results (see Clause 9).
8.2 Laboratory reference conditions
8.2.1 Climatic conditions
Unless otherwise specified by the committee responsible for the generic or product standard. the climatic conditions in the laboratory shall be within any limits specified for the operation of the EUT and the test equipment by their respective manufacturers.
Tests shall not be performed if the relative humidity is so high as to cause condensation on the EUT or the test equipment.
8.2.2 Electromagnetic conditions
The electromagnetic conditions of the laboratory shall be such as to guarantee the correct operation of the EUT so as not to influence the test results.
8.3 Execution of the test
The test shall be carried out on the basis of a test plan that shall include the verification of the performances of the EUT as defined in the technical specification.
The EUT shall operate in its normal operating conditions.
The test plan shall specify:
— type of test (laboratory or in situ).
— test level:
— coupling mode (common mode, and unsymmetric mode in the case of in-situ testing or when no CON is available):
— polarity of the test voltage (both polarities are mandatory):
— duration of the test per port (shall not be less than the time necessary for the EUT to be exercised and to respond but in no case it shall be less than 1 mm. Product committees may choose other test durations);
— repetition frequency;
— EUT ports to be tested;
— representative operating conditions of the EUT:
— sequence of application of the test voltage to the ports of the EUT;
— auxiliary equipment (AE).
9 Evaluation of test results
The test results shall be classified in terms of the loss or function or degradation of performance of the equipment under test, relative to a performance level defined by its manufacturer or the requestor of the test, or agreed between the manufacturer and the purchaser of the product. The recommended classification is as follows:
a) normal performance within limits specified by the manufacturer, requestor or purchaser:
b) temporary loss of function or degradation of performance which ceases after the disturbance ceases, and from which the equipment under test recovers its normal performance, without operator intervention:
c) temporary loss of function or degradation of performance, the correction of which requires operator intervention;
d) loss of function or degradation of performance which Is not recoverable, due to damage to hardware or software, or loss of data.
The manufacturer’s specification may define effects on the EUT which may be considered insignificant, and therefore acceptable.
This classification may be used as a guide in formulating performance criteria, by committees responsible for generic, product and product-family standards, or as a framework for the agreement on performance criteria between the manufacturer and the purchaser, for example where no suitable generic, product or product-family standard exists.
10 Test report
The test report shall contain all the information necessary to reproduce the test. In particular, the following shall be recorded:
— the items specified in the test plan required by Clause 8 of this standard;
identification of the EUT and any associated equipment, e.g. brand name, product type, serial number;
– identification of the test equipment, e.g. brand name, product type, serial number;
— any special environmental conditions in which the test was performed, e.g. shielded enclosure;
– any specific conditions necessary to enable the test to be performed; drawing and/or pictures of the test setup and EUT arrangement;
– performance level defined by the manufacturer. requestor or purchaser;
– performance criterion specified in the generic, product or product-family standard;EN 61000-4-4-2012 pdf download.