EN 55024 EMC Testing Overview, Key Features, & Importance

EN 55024

OVERVIEW OF EN 55024

EN 55024 is equivalent to CISPR 24 and applies to information technology equipment (ITE). EN 55024 defines the immunity test requirements for information technology equipment in relation to continuous and transient conducted and radiated disturbances. Tests within the standard include:

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EN 55024 EMC TESTING

EN 55024 EMC Testing

EN 55024 is a European standard that specifies the requirements and test methods for electromagnetic compatibility (EMC) of information technology equipment (ITE). This standard applies to a wide range of devices including computers, monitors, printers, network equipment, and other IT peripherals.

Key Features of EN 55024 EMC Testing:

Electromagnetic Emission Requirements: Specifies limits for electromagnetic emissions from ITE, ensuring they do not interfere with other electronic devices.
Immunity Requirements: Defines levels of immunity that ITE should demonstrate against electromagnetic disturbances, ensuring uninterrupted operation.
Test Methods: Provides procedures for measuring emissions and immunity, including radiated and conducted emissions testing, electrostatic discharge (ESD) testing, and more.
Documentation: Requires manufacturers to provide documentation demonstrating compliance with the standard.

Importance of EMC Testing:

EMC testing is crucial to ensure that electronic devices operate reliably in different environments without causing or being affected by electromagnetic interference (EMI). Non-compliance with EMC standards can result in malfunctions, safety hazards, and legal consequences.

How EMC Testing is Conducted:

EMC testing involves subjecting the device under test (DUT) to various electromagnetic fields to assess its emission levels and immunity to external interference. Tests may include radiated emissions, conducted emissions, electrostatic discharge (ESD), electrical fast transient (EFT), and more. The DUT is evaluated against predefined criteria to determine compliance with EN 55024 requirements.

Test Setup for Surge during EN 55024 Certification

Example EN 55024 EMC Test Report

Environmental phenomenon	Test specification	Units	Performance criteria	Basic standard	Verdict
Power-frequency magnetic field 1	50 1	Hz A/mRMS	A2	EN 61000-4-8	Not applicable
Radio-frequency electromagnetic field amplitude modulated 3	80–1000 3 80	MHz V/mRMS (unmodulated) % AM (1 kHz)	A	EN 61000-4-3	Pass
Electrostatic discharge (ESD)	4 (Contact discharge) 8 (Air discharge)	kV (charge voltage) kV (charge voltage)	B	EN 61000-4-2	Pass
Notes:	1 Applicable only to EUT containing devices susceptible to magnetic fields, such as CRT monitors, Hall elements, electrodynamic microphones, magnetic field sensors, etc. 2 See Annex B (EN 55024: 2010) as appropriate. 3 The frequency range is scanned as specified. However, when specified in Annex A (EN 55024: 2010), an additional comprehensive functional test shall be carried out at a limited number of frequencies. The selected frequencies are: 80, 120, 160, 230, 434, 460, 600, 863 and 900 MHz (±1 %).

Environmental phenomenon

Test specification

Units

Performance criteria

Basic standard

Verdict

Radio-frequency continuous conducted 1 and 3

0.15–80

MHz

VRMS (unmodulated)

% AM (1 kHz)

EN 61000-4-6

Pass

Surge (line to ground) 2, 4, 5, and 7

1 or 4

10/700

kV (peak)

Tr/Th s

EN 61000-4-5

Not applicable

Fast transients 3, 5, and 6

0.5

5/50

kV (peak)

Tr/Th ns

kHz (repetition rate)

EN 61000-4-4

Pass

Notes:

1 The frequency range is scanned as specified. However, when specified in Annex A (EN 55024: 2010), an additional comprehensive functional test shall be carried out at a limited number of frequencies. The selected frequencies for conducted tests are: 0.2, 1, 7.1, 13.56, 21, 27.12 and 40.68 MHz (±1 %).

2 Applicable only to ports which according to the manufacturer’s specification may connect directly to outdoor cables.

3 Applicable only to cables which according to the manufacturer’s specification supports communication on cable lengths greater than 3 m.

4 For ports where primary protection is intended, surges are applied at voltages up to 4 kV with the primary protectors fitted. Otherwise the 1 kV test level is applied without primary protection in place.

5 Test applied to all lines simultaneously to earth (ground).

6 For xDSL equipment, the repetition frequency for EFT testing shall be 100 kHz (See EN 55024: 2010 Annex H).

7 Where the coupling network for the 10/700 µs waveform affects the functioning of high speed data ports, the test shall be carried out using a 1,2/50 (8/20) µs

waveform and appropriate coupling network.

Environmental phenomenon

Test specification

Units

Performance criteria

Basic standard

Verdict

Radio-frequency continuous conducted 1

0.15–80

MHz

VRMS (unmodulated)

% AM (1 kHz)

EN 61000-4-6

Not applicable

Surge (line to ground) 2

1.2/50 (8/20)

0.5

Tr/Th s

kV (peak)

EN 61000-4-5

Not applicable

Fast transients

0.5

5/50

kV (peak)

Tr/Th ns

kHz (repetition rate)

EN 61000-4-4

Not applicable

Notes:

If d.c. power is fed on conductors included in a signal cable, then the requirements of EN 55024: 2010 Table 2 only apply to this cable.

1 The frequency range is scanned as specified. However, when specified in EN 55024: 2010 Annex A, an additional comprehensive functional test shall be carried out at a limited number of frequencies. The selected frequencies for conducted test are: 0.2, 1, 7.1, 13.56, 21, 27.12 and 40.68 MHz (±1 %).

2 Applicable only to ports which according to the manufacturer’s specification may connect directly to outdoor cables.

Environmental phenomenon		Test specification	Units	Performance criteria	Basic standard	Verdict
Radio-frequency continuous conducted 1		0.15–80 3 80	MHz VRMS (unmodulated) % AM (1 kHz)	A	EN 61000-4-6	Pass
		100 0.5	% reduction period	B		Pass
Voltage dip 2					EN 61000-4-11
		30 25	% reduction periods	C		Pass
Voltage interruptions 2		100 250	% reduction periods	C	EN 61000-4-11	Pass
Surge 3		1.2/50 (8/20) (line to line) (line to ground)	Tr/Th s kV (peak) kV (peak)	B	EN 61000-4-5	Pass
Fast transients		1 5/50 5	kV (peak) Tr/Th ns kHz (repetition rate)	B	EN 61000-4-4	Pass
Notes:	1 The frequency range is scanned as specified. However, when specified in Annex A (EN 55024: 2010), an additional comprehensive functional test shall be carried out at a limited number of frequencies. The selected frequencies for conducted test are: 0.2, 1, 7.1, 13.56, 21, 27.12 and 40.68 MHz (±1 %). 2 Changes to occur at 0 degree crossover point of the voltage waveform. 3 When the manufacturer specifies protection measures and it is impractical to simulate these measures during the tests, then the applied test levels shall be reduced to 0.5 kV (line to line) and 1 kV (line to earth (ground)).