IEC 61326:2002 pdf download

IEC 61326:2002 pdf download.Electrical equipment for measurement,control and laboratory use – EMC requirements.
3.9
controlled electromagnetic environment
environment usually characterized by recognition and control of EMC threats by users of the equipment or design of the installation
3.10
intrinsic error
error of a test or measuring instrument when used under reference conditions
[IEC 60359, definition 4.20, modified]
variation
difference between the indicated values for the same value of the measured quantity of an indicating or recording instrument when a single influence quantity assumes successively two different values
[IEC 60359, definition 4.21, modified]
3.12
Void
3.13
transducer with integrated signal conditioning
transducer in which all components for signal conditioning are integrated in the enclosure (see figure F.1).
3.14
transducer with remote signal conditioning
transducer whose components for signal conditioning are installed in separate enclosures (see figure F.2)
3.15
transmission link
connection between the individual components of a transducer with remote signal conditioning
3.16
nominal range
clearly specified value or upper limit of the measuring range
4 General
Equipment and systems within the scope of this standard can be subjected to various kinds of electromagnetic disturbances, conducted by power, measurement or control lines, or radiated from the environment. The types and levels of disturbances depend on the particular conditions in which the systems, subsystems or equipment are installed and operate.
Equipment such as generators, analysers, frequency meters shall fulfil the requirements under conditions defined by the manufacturer (that is without a test object connected, or connecting a 50 termination to the output of a signal generator).
The manufacturer shall give information that emissions which exceed the levels required by this standard may occur when equipment is connected to a test object.
The acceptance criteria regarding the immunity requirements are structured taking into account the functionality and dependability aspects.
Equipment and individual devices of a system within the scope of this standard may also be a source of electromagnetic disturbances over a wide frequency range. These disturbances may be conducted through power and signal lines, or be directly radiated, and may affect the performance of other equipment, or influence the external electromagnetic environment.
For emissions, the objective of these requirements is to ensure that the disturbances generated by the equipment and systems, when operated normally, do not exceed a level which could prevent other systems from operating as intended. Emission limits for industrial locations are given in table 3. Emission limits for non-industrial locations are given in table 4.
To comply with this standard, no additional EMC tests are required beyond those stated here.
NOTE 1 Higher immunity levels than those specified may be necessary for particular applications (for example, when reliable operation of the equipment is essential for safety) or when the equipment is intended for use in harsher electromagnetic environments.
NOTE 2 This standard does not specify basic safety requirements such as protection against electric shock, unsafe operation, insulation co-ordination and related dielectric tests for equipment. See IEC 61010 for safety requirements.
NOTE 3 The emission limits of this standard may not, however, provide full protection against interference to radio and television reception when the measurement, control or laboratory equipment is used closer than 30 m to the receiving antenna for industrial or professional applications, and closer than 10 m for domestic and commercial applications.
NOTE 4 In special cases, for example when highly susceptible equipment is being used in close proximity, additional mitigation measures may have to be employed to reduce the influencing electromagnetic emission further below the specified limits.
NOTE 5 The manufacturer may elect to perform all tests either on a single EUT or more than one. The testing sequence is optional.
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. It shall contain as a minimum the elements given in 5.2 to 5.5.
It may be determined from consideration of the electrical characteristics and usage of a particular apparatus that some tests are inappropriate and therefore unnecessary. In such cases the decision not to test shall be recorded in the EMC test plan.
5.2 Configuration of EUT during testing
5.2.1 General
Measurement, control and laboratory equipment often consists of systems with no fixed configuration. The kind, number and installation of different subassemblies within the equipment may vary from system to system. Thus it is reasonable, and also recommended, not to test every possible arrangement.