EMC Terms and Abbreviations

Wavelength:

Between the wave repeating unit of a given frequency range

In a single market in the European Economic Area (EEA), a mandatory compliance mark must be identified on many products

long wave

The frequency of 100KHz, wavelength 3.000m

Field strength:

The received electromagnetic field strength

Liner:

Through the closed slot and the grounding element to stop EMI

magnetic field

This space, in this space by the magnetic force generated by magnet or current role in mobile charge or magnetic dipole

Magnetic shielding:

In order to cover the magnetic source without magnetic effect

The magnetic flux density (amount)

The flux per unit area

CISPR:

The International Special Committee on radio interference

Magnetic (rate):

The magnetization degree of materials, a linear relationship with the applied magnetic field

Conductor:

The conductive material, its resistance to 10-6~10-4 ohm-cm

Db:

DB, with logarithmic representations of the ratio of the two

Charge:

The storage characteristics of a natural number of subatomic particles, determines their electromagnetic interaction

Electric (rust inhibitor):

An electrochemical process, when using a different type of metal as an electrode and another at the same time when the metal is immersed in an electrolyte solution. Another good metal corrosion

Capacitor：

The charge storage device is composed of two boards, a conductive material, the other one is non conductive or insulating material

(electric) potential difference (bit):

The voltage difference between two potential;

Potential pressure

Each unit charge potential

Low frequency:

The frequency of 20~20000Hz

Short wave:

The frequency of 6~30MHz, wavelength 10~50m

Short circuit:

Communication between two nodes in the circuit

EMC:

electromagnetic compatibility

EMC indicator:

Anti interference and radiation devices, machines and systems have the lowest standard

EMI:

electromagnetic interference

EMP:

Electromagnetic pulse; electric pulse, LEMP (lightning electromagnetic pulse), NEMP (nuclear electromagnetic pulse)

EMS:

Electromagnetic sensitivity

ESD:

Electromagnetic discharge. When the breakdown voltage of the electrostatic voltage is larger than that of air, conductive objects will discharge. In order to avoid this phenomenon, we need to be grounded.

Reflection loss:

By the reflection signal power caused by transmission lines or fiber placement equipment.

FCC:

The Federal Communications Commission, responsible for electrical and communication rules and regulations

The enclosures:

Box

FFR:

Far field region. In this region, the usual distribution basically has nothing to do with the field source distance of electromagnetic wave in the region is a plane wave

Radiation:

The electric energy emitted by the radiation source

Feel (degree):

EMI affected degree

The induced electric field:

Formed by the antenna emission and attenuation with distance ratio

High frequency:

The frequency of more than 30KHz

(high harmonic wave):

AC distortion in the low frequency part of wave wave wave; no communication foundation.

(total harmonic vibration):

Agreement

Millimeter wave:

The frequency of 30~3000GHz, wavelength 0.1~1mm

Ground:

Ground and standard voltage connections

Medium:

Insulating materials

Dielectric coefficient:

The static dielectric constant

Contact resistance:

The charged end part resistance resulting from the material resistance and resistance of the connecting part of the

Electrostatic induction:

The distribution of objects within the charge, caused by the effect of near charge

Electrostatic shielding:

The covering ground with conductive materials, the purpose is not affected by the voltage difference between the two metal effect

Insulating materials:

Stop the flow of the current material

Immunity

The circuit, the resistance ability of EMI equipment and systems

Centimeter wave (FM):

The frequency of 3~30GHz, wavelength 1~10cm

Wave filter：

The device can perform signal processing procedures, particularly the elimination of elements from the frequency of the signal does not want, want to enhance the signal frequency

MIL:

Land, sea, air force military standard, DOD is the United States Department of defense standard

Dipole antenna:

An antenna made of simple wire, with the midpoint driving element, used to transmit or receive radio frequency energy

Frequency:

The number of cycles or cycles per unit time, the unit is Hz (A / s)

Shield：

Protection or insulation from electrostatic field, the effects of static magnetic field and electromagnetic field

Electric (device):

Adjust the system so that the system can be operated by electricity

RFI:

Radio frequency interference

S.E:

Shielding efficiency

Output:

Energy to load voltage, current and power lines or equipment to express

Elastomer：

High elastic polymeric compounds

Antenna:

Emission or absorption device of electromagnetic waves in space

Ferrite (ferrite):

With iron or iron alloy body centered cubic crystal structure, ferrite high frequency current decay

UL standard:

Safety standard of UL company

VCCI:

The private management committee focused on information technology and equipment interference

External immunity:

In addition to all of the required ANT and the input end, the anti disturbance ability does not include EMI

Microwave:

The frequency of 300MHZ ~ 30GHz, 1cm ~ 1m wavelength

Absorbing sheet:

The electromagnetic energy is converted into heat energy and the consumption of materials

Noise:

The internal noise sources such as resistors, terminals, diode, triode; external noise sources such as electrical device, discharge spark plug, induction noise from TV and radio, lightning

Ghost:

A similar picture on the screen, formed by fault wave reflection or emission receiver

Impedance:

The ratio of the circuit block alternating current (R), depending on the resistance, inductance, capacitance (L) (C), as the DC resistance