Collect
Check out my collection
0
Useful +1
EMC testing, also known as electromagnetic compatibility (EMC) testing, refers to the size of the interference of electronic products in the electromagnetic field (EMC).
EMI
The comprehensive evaluation of anti-interference capability (EMS) is one of the most important indicators of product quality, and the electromagnetic compatibility measurement system is composed of test sites and test instruments.
The purpose of EMC testing is to detect the impact of electromagnetic radiation generated by electrical products on the human body, the power grid in public places and other electrical products in normal operation.
- Chinese name
- EMC test
- Foreign name
- EMC Test
- EMC
- Electromagnetic compatibility
- encompass
- Electromagnetic field interference size EMI anti-interference capability EMS
- Group into
- Test site and test instrument
- EMI test item 1
- RE (radiation, emission) CE(Conducted interference)
- EMI test item 2
- Harmonic Flicker
- EMS test item 1
- ESD (ESD) Static electricity ) EFT ( Transient state Pulse interference)
- EMS test item 2
- DIP(voltage drop) CS (Conductive Interference)
- EMS test item 3
- RS (Radiation Immunity) Surge(lightning surge)
- EMS test item 4
- PMS(Power Frequency Magnetic Field Immunity)
catalogue
Electromagnetic compatibility (EMC) is a subject that studies that under the conditions of limited space, time and spectrum resources, various electrical devices (including organisms in a broad sense) can coexist without causing degradation. It includes two parts: electromagnetic interference and electromagnetic sensitivity. Electromagnetic interference test is to measure the size of the electromagnetic wave signal generated and emitted by the device under normal working condition to characterize the strength of its interference to the surrounding electronic equipment. Electromagnetic sensitivity test is to measure the strength of the anti-interference ability of the equipment under test to electromagnetic harassment
[1]
.
EMI test items include: RE (radiation, emission)
CE (Conducted Interference)
Harmonic
It was Flicker.
DIP (Voltage drop)
CS (Conducted Anti-interference)
RS (Radiation Immunity)
There was a Surge of lightning.
Electromagnetic interference mainly includes radiation emission and conducted emission.
Radiation emission:
Electromagnetic interference propagating through space in the form of electromagnetic waves.
Conducted emission:
Test venue:
Open field
Half anechoic room, shielding room.
Electromagnetic interference test main equipment:
1. Anechoic room
2. Receiver
3. Receiving antenna
5, power absorption pliers
6, turntable, lifting table
7, rotary table, lifting table controller
EMC test project, EMC test project parameters and indicators.
conduction conduction emission (9kHz-30MHz)
power clamp (30MHz-300MHz)
magnetic emission (9kHz-30MHz)
radiated emission of space radiation (30MHz-18GHz)
Intermittent conduction interference click
harmonics class a,b,c,d
Voltage flicker Flicker plt.pst
Electrostatic ESD (±0.1-±16.5kV)
Radiation immunity (below 1GHz)
Fast pulse group EFT/B (±0.1-±4.4kV)
surge surge (0.1-6.6kV)
Conductive immunity CS (0.1-30V)
Anti-magnetic field interference MS (0-120A/m)
Power off Dips (0%-100%)
Oscillatory Waves Surge 0.1-6.6kV waveform 100kHz
Harmonic and interharmonic immunity
Magnetic field EFM 10Hz-400kHz (EN50366)
[2]
1.EMI (Electro-Magnetic Interference) : electromagnetic interference test
EMI test main contents:
Radiated Emission - Radiation disturbance test
Conducted Emission- Conducted harassment test
Harmonic- Harmonic current disturbance test
Flicker- Voltage variation and flicker test
2. EMS (Electro-Magnetic Susceptibility) -- electromagnetic susceptibility test
The purpose of this test is to test whether the electrical products can work stably in the electromagnetic environment without being affected.
Main contents of EMS test:
ESD- static immunity test
RS- Radiofrequency electromagnetic field radiation immunity test
CS- Conducted disturbance immunity test for RF field induction
DIP- Immunity testing for voltage dips, short interruptions and voltage changes
SURGE- Surge immunity test
EFT- Electrical fast transient pulse group immunity test
PFMF- Power frequency magnetic field immunity test
Stray definition: Radiation at discrete frequencies other than carrier frequencies and sideband and adjacent channels due to normal modulation and switching transients when a standard test signal is modulated (i.e. far end radiation). Stray radiation can be divided into two types according to its source: conduction type and radiation type.
Conducted stray: refers to the level power of any discrete signal measured at the 50 ohm load at the antenna junction.
Radiation stray: Stray disturbance caused by the housing, structure and interconnect cables of the test equipment. The test conditions are preferred to be carried out in the anechoic room or outdoors.
First, EMI (
Electromagnetic disturbance
There are two types of test: radio frequency and power frequency
1. Rf test items:
1.1 Radio frequency is divided into conduction and radiation tests
Rf conduction (shielded chamber test)
1.1.1 Conduction voltage and power tests
1.1.2 Conduction voltage standard: CISPR11, 14, 15, 22
1.1.3 Conduction power standards: CISPR11, 14
Radio-frequency radiation
(anechoic chamber test)
1.1.4 RF radiation standards: CISPR11, 22, IEC60571
l Power frequency test project (laboratory test)
1.2 Power frequency subdivision harmonic and flicker two tests
Power frequency harmonic 1.2.1 IEC6100-3-2
Power frequency blinking 1.2.2 IEC6100-3-3
Ii. EMS (
Electromagnetic sensitivity
Minute transient,
Radio frequency
, low frequency magnetic field, power quality
2. Transient test items (laboratory tests)
2.1 Transient tests include static electricity, transient pulse and surge
Transient electrostatic IEC6100-4-2
Transient pulse IEC6100-4-4
Transient surge IEC6100-4-5
2.2 Radiofrequency tests include conduction and radiation
Radio frequency conduction IEC61004-6 (Laboratory test)
Radio-frequency radiation IEC6100-4-3 (anechoic chamber test)
2.3 Low frequency magnetic field is divided into pulse magnetic field and power frequency magnetic field
Pulse magnetic field IEC6100-4-9
Power frequency magnetic field IEC6100-4-8
Power quality test project (Laboratory test)
2.4 points drop, interrupt, voltage change three tests, IEC6100-4-11,
Note:
1. Conducted power test area > 7x1M.
2. Conduction voltage test table: recommended 2x1.5x0.8, to consider the test area of the cabinet equipment.
3. Harmonics and flicker test area >2x2.
5. Transient and power quality test table: recommended 2x1.5x0.8, the same test table can be used.
6. Conducted RF sensitivity test table: recommended 2x1.5x0.8, the same test table can be used.
7. The shielding room and laboratory should have corresponding temperature and humidity requirements.
8. Sensitivity test should not be around sensitive equipment.
9. When testing in the laboratory, there should be no emission or interference equipment around, otherwise the test should be carried out in a shielded room.
10. Divide
Power amplifier
And harmonics, flicker The system uses three-phase power supply, and other devices use single-phase power supply.
11. The above is the minimum test environment requirements.
12 All test standards, if you need national standards, please refer to the standard comparison table
[3]
.
EN 55014-1: Radiation from household appliances
EN 55014-2: Radiation immunity of household appliances
EN 55011: Radiation from industrial, scientific and medical equipment
EN 55013/20: Audio and video products
EN 55015: Radiation from lighting appliances
EN 61547: Radiation immunity of lighting appliances
EN 55024: Radiation immunity of information technology equipment
EN 60601-1-2: Electromagnetic Compatibility of medical electronic devices
EN 61000-6-1: Radiation from general equipment for use in residential, commercial and light industrial environments
EN 61000-6-3: Radiation immunity of general equipment for use in residential, commercial and light industrial environments
EN 61326: Electromagnetic compatibility of measuring instruments and equipment
IEC 61000-4-4-2004 Electromagnetic Compatibility test and measurement techniques
Electrical fast transient pulse group immunity test
IEC 61000-4-5-2005 Electromagnetic Compatibility test and measurement techniques Surge (shock) immunity test
IEC 61000-4-11-2004 Electromagnetic compatibility tests and measurement techniques - Immunity tests for voltage dips, short interruptions and voltage variations
IEC 61000-4-2-2001 Electromagnetic Compatibility test and measurement techniques
Electrostatic discharge immunity test
