Harmonic Current Testing

Harmonic Current Test 1. Harmonic Current Test Reference Standard: IEC 61000-3-2:2001 2. Main Test Equipment for Harmonic Current: Limits: Table 1 Limits for Class A Equipment

View More

Radiated Immunity Testing (RS)

This standard primarily introduces the test method of the international standard IEC 61000-4-3:2006, corresponding to the national standard GB/T 17626.3:2006 "Electromagnetic compatibility (EMC) - Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test".

View More

Power Frequency Magnetic Field Immunity Testing

1. Power Frequency Magnetic Field Immunity Test Reference Standard: IEC61000-4-8:2001 2. Stable Continuous Power Frequency Magnetic Field Immunity Test Levels 1) 1 A/m; 2) 3 A/m; 3) 10 A/m; 4) 30 A/m; 5) 100 A/m; 6) X/Undefined

View More

Radiated Emission Testing

The Radiated Emission (RE) test measures the radiation disturbance field strength transmitted through space by the Equipment Under Test (EUT). It can be divided into magnetic field radiation and electric field radiation. The former applies to lighting fixtures and induction cookers, while the latter is more widely used. Additionally, household appliances, power tools, and auxiliary equipment for AV products have requirements for disturbance power (referred to as disturbance power).

View More

EMC Testing

The electromagnetic compatibility testing commonly referred to generally includes domestic EMC testing and the European Union's EMC Directive (2014/30/EU). Both refer to the ability of equipment or systems to operate in compliance with requirements within their electromagnetic environment without causing intolerable electromagnetic interference to any devices in that environment. The International Electrotechnical Commission (IEC) defines electromagnetic compatibility as: the ability of a system or device to function normally in its electromagnetic environment while not causing interference to other systems and devices.

View More

Conducted Immunity Testing

The disturbance source studied in the Radio Frequency Field-Induced Conducted Disturbance Immunity Test typically refers to the electromagnetic field from radio frequency transmitters. This electromagnetic field can act on the entire cable connected to the installed equipment. Although the size of the disturbed equipment is smaller than the wavelength of the disturbance frequency, I/O lines, such as power lines, communication lines, interface cables, etc., may become passive receiving antenna networks because their length may be several wavelengths.

View More

Surge (Impulse) Immunity Testing

Surge refers to the current, voltage, or power transmitted along a line, characterized by a rapid rise followed by a slow decay. Surge (impact) immunity testing simulates severe interference caused by lightning. Surge current immunity testing for measurement and control devices in industrial processes simulates surge voltages and currents that equipment may encounter due to lightning strikes or switching operations under various environmental and installation conditions. Surge immunity testing provides a basis for evaluating the anti-interference capability of equipment power lines, I/O lines, and communication lines.

View More

Voltage Dip Testing

1. Voltage Dip Test Items: Voltage Sag and Short Interruptions 2. Voltage Dip Test Reference Standard: IEC61000-4-11:2004 3. Main Test Equipment for Voltage Dip Testing: Test Signal Generator Limits:

View More

Conducted Emission Testing

Conducted emissions are also commonly referred to as disturbance voltage tests. Any product with a power cord involves conducted emissions testing, including many DC-powered products. Additionally, many standards also have requirements for conducted emissions on signal/control lines, typically expressed in terms of disturbance voltage or current limits (the two are convertible). Insertion loss testing (expressed directly in dB) for lighting fixtures also falls under the category of conducted testing.

View More

Electrostatic Discharge (ESD) Immunity Testing

The national standard for Electrostatic Discharge (ESD) Immunity Testing is GB/T 17626.2 (equivalent to the international standard IEC 61000-4-2). Electrostatic discharge (ESD) is a natural phenomenon. Experience shows that when a person walks on a synthetic fiber carpet, the friction between shoes and the carpet can cause the human body to accumulate a charge of more than 10-6 coulombs within a few steps (depending on the resistance between the shoes and the carpet). In such a "system" (person/carpet/earth), the average capacitance is about tens to hundreds of pF, and the resulting voltage can reach up to 15 kV. Studies on ESD generated by different individuals show various current pulses, with rise times ranging from 100 ps to 30 ns. Electronics engineers have found that ESD often occurs when the human body comes into contact with semiconductor devices, potentially causing breakdown of multiple semiconductor layers and irreversible damage. ESD and the subsequent electromagnetic field changes can also disrupt the normal operation of electronic equipment.

View More