Conduction tolerance test (CS)

Passed to the tolerance test (CS)
Conducted disturbance immunity overview
This standard mainly introduces the international standard IEC61000-4-6:2006, corresponding to the national standard GB/T17626.6:1998 "Electromagnetic compatibility test and measurement technology RF field induction of conducted disturbance immunity" test method.
Conducted disturbance immunity test purpose and application
The main source of disturbance involved in this standard is the electromagnetic field generated by an RF transmitter from the 9 kHz to 80 MHz frequency range. The electromagnetic field acts on the connection lines of power lines, communication lines and interface cables of electrical and electronic equipment. The length of these connection leads may be equivalent to several wavelengths of the interference frequency. Therefore, these leads become passive antennas and accept Induction of the external electromagnetic field, the lead cable can be electrically connected to the outside of the device by conduction (finally near-field electromagnetic disturbance caused by RF voltage and current to the inside of the device) to interfere with the device. This affects the normal operation of the device. Therefore, the purpose of this standard is to establish a common reference for evaluating the conducted disturbance immunity performance of RF field sensing, providing a basic reference for the professional technical committee or user and manufacturer of the product.
Common terminology for conducted disturbance immunity
(1) Artificial hand
An electrical network that simulates the body impedance between a handheld electrical device and the ground under normal operating conditions
(2) Auxiliary equipment
Equipment that provides the required signals for the normal operation of the equipment under test and equipment that verifies the performance of the equipment under test.
(3) injection pliers
u current clamp
A current transformer implemented by a secondary winding of a cable to which a signal is injected.
u Electromagnetic forceps
An injection device that combines capacitive and inductive coupling.
(4) Common mode impedance
The ratio of common mode voltage to common mode current at a port.
(5) Coupling coefficient
The ratio of the open circuit voltage (electromotive force) obtained at the device port of the coupling device to the open circuit voltage at the output of the signal generator
(6) Coupling network
A circuit that transfers energy from one circuit to another at a specified impedance.
(7) Decoupling network
Preventing measurement signals applied to the device under test from affecting the circuitry of other devices, devices, or systems that are not being measured.
(8) Voltage standing wave ratio
The ratio of the maximum voltage along the line to the adjacent minimum voltage amplitude.
Conducted disturbance immunity test level
u In the frequency range of 9 kHz to 150 kHz, no measurement is required for the induced disturbance caused by the electromagnetic field from the RF transmitter.
u In the frequency range of 150 kHz to 80 kHz, the immunity test for the induced disturbance caused by the electromagnetic field from the RF transmitter should be selected according to the electromagnetic environment of the equipment and the final installation of the cable according to the following table.
Frequency range 150kHz - 80MHz
Test level
Frequency range 150kHz~80MHz
Test level voltage (effective value)
U0, dBμV U0, V
X 120
140 1
1) X is an open level
Ø Class 1: Low-level radiation environment. The radio/TV station is at a typical level over a distance of 1 km and a typical level of a low power transmitting receiver.
Ø Category 2: Medium electromagnetic radiation environment. A low-power portable transmitter receiver (typically rated less than 1W) used in the vicinity of the device. Typical business environment.
Ø Category 3: Severe electromagnetic emission environment. Used for portable transmitters (≥2W) that are relatively close to the device but less than 1 m away. Used in high-power broadcast transmitters close to the equipment and possibly close to industrial, medical, and medical equipment. Typical industrial environment.
Ø × Class: × is an open level as defined by negotiation or product specifications and product standards.
u For equipment with a total size of less than 0.4 m and no conductive cable (such as power, signal or ground), the standard does not require this test. For example, a battery-powered device, when it is not connected to the earth or any other device, and is not used for charging, you do not need to do this experiment, but the device must be used during charging, you must do this experiment.
u The frequency range specified in the standard is 150 kHz - 80 MHz, but the actual test frequency range can be determined according to the analysis of the equipment under test. When the size of the equipment under test is small, the test frequency can be extended to 230 MHz.
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