Introduction to CDN testing methods:
The CDN test method is one of the test methods in the conducted immunity test system proposed by the international standard IEC61000-4-6 and GB/T 17262.6, which aims to use high-frequency RF signals injected into the power line of the EUT under test, and then observe whether the EUT's working status is affected.
EUTTEST provides standardized CDN conducted immunity test system, the following test configuration diagram will explain how to use CDN to build EMC-CS test system.
start testing
Diagram of the calibration configuration for the CDN test method:
The CDN method needs to be calibrated before testing can begin, and EUTTEST provides the following list of test equipment that needs to be used for test channel calibration:
- NSG 4070 More Conducted Immunity Generators Available
- 150Ω/50Ω Adapter
- 6dB Attenuator
- 50Ω Load
- RF cable
- CDN-coupled decoupling network (see summary note at the end for more optional models)
After contacting EUTTEST to purchase the above equipment, connect the NSG4070 output to the input port of the CDN according to the following diagram, and record the displayed value of the NSG4070 to confirm the forward power output level Vout.
Calibrate CDN input level Vout using NSG4070
Repeat each test frequency from 150 kHz to 230 MHz as required by IEC 61000-4-6 and record the Vout value at each frequency.
Test configuration diagram for the CDN test method:
The equipment used for CDN test method testing is the same as for calibration, and there is no need to purchase additional equipment.
After completing the above calibration process, we get the output level Vout of the NSG4070, now use the configuration in the figure below to connect the DUT and the AE auxiliary equipment, and inject the Vout at different frequency points inside the CDN, at this point, we need to observe and record the EUT's operating status, and then record each Vout value and the EUT's operating status in the test report.
Test EUT using NSG4070 calibration result Vout
Test Summary:
Note: Coupled decoupled network CDNs haveCDN-M,CSN-S,CDN-T,CDN-AF Please select the correct CDN based on the test examples listed in the table below and the type of cable under test.
Different types of CDNs
The above is the IEC61000-4-6 conducted immunity test system CDN test method provided by EUTTEST, EMC testers only need to follow the above configuration to complete the standard requirements of RF field induction conducted immunity test needs, if you have any questions about the above test program, please contact EUTEST to purchase the above equipment and build the test system according to the above section after Contact our after-sales personnel for advice.
