Electromagnetic compatibility testing in EMC lab EN 61326 – 1
EN 61326‒1:2013 Electrical equipment for measurement, control and laboratory use-EMC requirements Part 1: General requirements
Analog: IEC 61326 – 1:2012 Electrical equipment for measurement, control and laboratory use — EMC requirements — Part 1: General requirements
Replace: EN 61326 – 1:2006 Electrical equipment for measurement, control and laboratory use — EMC requirements — Part 1: General requirements
New in this edition:
• Susceptibility test levels and performance criteria have been reviewed;
• Requirements for portable test and measurement equipment have been clarified and amended;
• Electromagnetic environments description has been improved.
Scope
International standard EN 61326‒1:2013 is applicable for electrical equipment, operating from batteries or mains network with estimated voltage up to 1000V AC or 1500V DC intended to be used for professional, industrial or nonindustrial, manufacturing, educational purposes, including equipment for:
Equipment used for computation and assemblies for computation and similar equipment within the scope of Information Technology Equipment (ITE) that complies with applicable Information Technology Equipment EMC standards can be used in systems within the scope of EN 61326‒1:2013 and additional testing is not necessary in case, if Information Technology Equipment is suitable for the intended electromagnetic environment.
Classification
International standard EN 61326‒1:2006 for classification of equipment it covers, have a reference to international standard EN 55011:2016, that separates all equipment in two groups– Group 1 and Group 2, each group is subdivided in two classes– class 1 and class 2.
Group 1- covers all devices that are not covered by group 2
Group 2- covers devices that intentionally generates RF energy in frequency range 9kHz-400GHz, that is used in form electromagnetic radiation, inductive coupling, capacitive coupling for material analysis or inspection.
Class A- covers devices for usage in all establishments other than domestic and that are not directly connected to a low voltage power supply network, which supplies domestic environment.
Class B- covers devices for usage in domestic establishments that are directly connected to a low voltage power supply network, which supplies domestic environment.
If class A requirements are applied, then following or similar warning shall be included in the instructions for use:
Caution
Examples
Electrical measurement and test equipment, that records or indicates one or more electrical or non-electrical quantities– analyzers, generators, power supplies, transducers.
Equipment which controls one or more output quantities to specific values– industrial process measurement and control equipment including, controllers, regulators, power supplies and power systems, actuators, indicators positioners, shakers.
Laboratory equipment, that measures or monitors samples or is used to prepare samples. Also in vitro equipment used in industrial premises and laboratories or domestic premises.
Requirements
Equipment within the scope of EN 61326‒1:2013 might be operated in different environments. Emission and immunity test requirements are applicability depends electromagnetic environment. EN 61326‒1:2013 covers three types of electromagnetic environments:
• basic electromagnetic environment– areas supplied directly by low voltage from the public mains network (houses, apartments, shops, supermarkets, cinemas, bars, gas stations, car parking, bus stops, workshops, laboratories, service centres)
• industrial electromagnetic environment– environment supplied by a separate power network (high– or medium-voltage transformer), dedicated for the supply of installations feeding manufacturing or similar plants with one or more of the following conditions:
–frequent switching of heavy inductive/capacitive loads;
–high currents and high magnetic fields;
–presence of ISM equipment.
• controlled electromagnetic environment– environment usually characterized by recognition and control of EMC threats.
Limits
Emissions must satisfy requirements defined in:
EN 55011:2016 Industrial, scientific and medical equipment– Radio-frequency disturbance characteristics Limits and methods of measurement
EN 61000 – 3-2:2014 Electromagnetic compatibility (EMC) — Part 3 – 2: Limits — Limits for harmonic current emissions (equipment input current ≤16 A per phase)
EN 61000‒3‒3:2008 Electromagnetic compatibility (EMC) — Part 3 – 3: Limits –Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection (IEC 61000‒3‒3:2008)
Immunity requirements
Performance criterion A
The equipment under test shall continue to operate as intended during and after the test. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer, when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, either of these may be derived from the product description and documentation and what the user may reasonably expect from the equipment if used as intended.
Performance criterion B
The equipment under test shall continue to operate as intended after the test. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer, when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. During the test, degradation of performance is however allowed. No change of actual operating state or stored data is allowed. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, either of these may be derived from the product description and documentation and what the user may reasonably expect from the equipment if used as intended.
Criterion B example 1
A data transfer is controlled/checked by parity check or by other means. In the case of malfunctioning, such as caused by a lightning strike, the data transfer
will be repeated automatically. The reduced data transfer rate at this time is acceptable.
Criterion B example 2
During testing, an analogue function value may deviate. After the test, the deviation vanishes.
Criterion B example 3
In the case of a indicators/monitors/displays are used, it is acceptable that some degradation takes place for a short time, such as flashes during the EFT test.
Criterion B example 4
An intended change of the operating state is allowed if self-recoverable.
Performance criterion C
Temporary loss of function is allowed, provided the function is self-recoverable or can be restored by the operation of the controls.
Criterion C example 1
In the case of a mains power interruption the power supply unit of the equipment is switched off. Turn-on may be automatic or carried out by the operator.
Criterion C example 2
During and after the test the processor functions of the equipment stops at a defined position and is not left in a “crashed state”. The operator’s decision prompts may be necessary.
Criterion C example 3
During the surge test overcurrent protection intervene. As a result, over-current protection device that is replaced or reset by the operator.
EN 61326‒1:2013 Electrical equipment for measurement, control and laboratory use-EMC requirements Part 1: General requirements
Analog: IEC 61326 – 1:2012 Electrical equipment for measurement, control and laboratory use — EMC requirements — Part 1: General requirements
Replace: EN 61326 – 1:2006 Electrical equipment for measurement, control and laboratory use — EMC requirements — Part 1: General requirements
New in this edition:
• Susceptibility test levels and performance criteria have been reviewed;
• Requirements for portable test and measurement equipment have been clarified and amended;
• Electromagnetic environments description has been improved.
Scope
International standard EN 61326‒1:2013 is applicable for electrical equipment, operating from batteries or mains network with estimated voltage up to 1000V AC or 1500V DC intended to be used for professional, industrial or nonindustrial, manufacturing, educational purposes, including equipment for:
- tests and measurements;
- control;
- laboratory use;
- accessories intended to be used for upper mentioned equipment.
- equipment used in residential, commercial and light industrial environments, as described in EN 61000‒6‒1;
- equipment intended to be used in industrial locations;
- equipment to be used in laboratories with a controlled electromagnetic environment;
- portable test and measurement equipment.
Equipment used for computation and assemblies for computation and similar equipment within the scope of Information Technology Equipment (ITE) that complies with applicable Information Technology Equipment EMC standards can be used in systems within the scope of EN 61326‒1:2013 and additional testing is not necessary in case, if Information Technology Equipment is suitable for the intended electromagnetic environment.
Classification
International standard EN 61326‒1:2006 for classification of equipment it covers, have a reference to international standard EN 55011:2016, that separates all equipment in two groups– Group 1 and Group 2, each group is subdivided in two classes– class 1 and class 2.
Group 1- covers all devices that are not covered by group 2
Group 2- covers devices that intentionally generates RF energy in frequency range 9kHz-400GHz, that is used in form electromagnetic radiation, inductive coupling, capacitive coupling for material analysis or inspection.
Class A- covers devices for usage in all establishments other than domestic and that are not directly connected to a low voltage power supply network, which supplies domestic environment.
Class B- covers devices for usage in domestic establishments that are directly connected to a low voltage power supply network, which supplies domestic environment.
If class A requirements are applied, then following or similar warning shall be included in the instructions for use:
Caution
This equipment is not intended for use in residential environments and may not provide adequate protection to radio reception in such environments. |
Examples
Electrical measurement and test equipment, that records or indicates one or more electrical or non-electrical quantities– analyzers, generators, power supplies, transducers.
Equipment which controls one or more output quantities to specific values– industrial process measurement and control equipment including, controllers, regulators, power supplies and power systems, actuators, indicators positioners, shakers.
Laboratory equipment, that measures or monitors samples or is used to prepare samples. Also in vitro equipment used in industrial premises and laboratories or domestic premises.
Requirements
Equipment within the scope of EN 61326‒1:2013 might be operated in different environments. Emission and immunity test requirements are applicability depends electromagnetic environment. EN 61326‒1:2013 covers three types of electromagnetic environments:
• basic electromagnetic environment– areas supplied directly by low voltage from the public mains network (houses, apartments, shops, supermarkets, cinemas, bars, gas stations, car parking, bus stops, workshops, laboratories, service centres)
• industrial electromagnetic environment– environment supplied by a separate power network (high– or medium-voltage transformer), dedicated for the supply of installations feeding manufacturing or similar plants with one or more of the following conditions:
–frequent switching of heavy inductive/capacitive loads;
–high currents and high magnetic fields;
–presence of ISM equipment.
• controlled electromagnetic environment– environment usually characterized by recognition and control of EMC threats.
Limits
Emissions must satisfy requirements defined in:
EN 55011:2016 Industrial, scientific and medical equipment– Radio-frequency disturbance characteristics Limits and methods of measurement
EN 61000 – 3-2:2014 Electromagnetic compatibility (EMC) — Part 3 – 2: Limits — Limits for harmonic current emissions (equipment input current ≤16 A per phase)
EN 61000‒3‒3:2008 Electromagnetic compatibility (EMC) — Part 3 – 3: Limits –Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection (IEC 61000‒3‒3:2008)
Immunity requirements
Performance criterion A
The equipment under test shall continue to operate as intended during and after the test. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer, when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, either of these may be derived from the product description and documentation and what the user may reasonably expect from the equipment if used as intended.
Performance criterion B
The equipment under test shall continue to operate as intended after the test. No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer, when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. During the test, degradation of performance is however allowed. No change of actual operating state or stored data is allowed. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, either of these may be derived from the product description and documentation and what the user may reasonably expect from the equipment if used as intended.
Criterion B example 1
A data transfer is controlled/checked by parity check or by other means. In the case of malfunctioning, such as caused by a lightning strike, the data transfer
will be repeated automatically. The reduced data transfer rate at this time is acceptable.
Criterion B example 2
During testing, an analogue function value may deviate. After the test, the deviation vanishes.
Criterion B example 3
In the case of a indicators/monitors/displays are used, it is acceptable that some degradation takes place for a short time, such as flashes during the EFT test.
Criterion B example 4
An intended change of the operating state is allowed if self-recoverable.
Performance criterion C
Temporary loss of function is allowed, provided the function is self-recoverable or can be restored by the operation of the controls.
Criterion C example 1
In the case of a mains power interruption the power supply unit of the equipment is switched off. Turn-on may be automatic or carried out by the operator.
Criterion C example 2
During and after the test the processor functions of the equipment stops at a defined position and is not left in a “crashed state”. The operator’s decision prompts may be necessary.
Criterion C example 3
During the surge test overcurrent protection intervene. As a result, over-current protection device that is replaced or reset by the operator.