Coupling De-Coupling Networks
Coupling De-Coupling Networks
Coupling De-Coupling Networks (CD) are utilised for conducted immunity testing in accordance with IC 61000-4-6.
The TBCDN-Mx series complies with Annex D2 of IC 61000-4-6. It is designed to inject common mode disturbance signals into unscreened AC and DC power supply lines in the frequency range of 150 kHz to 230 MHz.
IC 61000-4-6 immunity tests simulate electrical equipment vulnerability to transmitter signals radiated into the wire harness. The highest voltage is injected by transmitter signals whose frequency coincides with the cable’s resonance frequency. In resonance, cables connected to electrical equipment act as receiving antennas with a common mode impedance of 150 Ohm. Therefore, by using coupling and decoupling networks with 150 common mode impedance, the test setup imitates resonating cables.
CD M-type are used for injecting disturbance voltage into AC or DC supply lines, unscreened lines, unbalanced lines.
Coupling De-Coupling Networks Emission
CDNEs are a type of Coupling Decoupling Networks used for an alternative technique of measuring radiated emission of lighting equipment in accordance with the CISPR 15 (EN55015) standard.
It avoids the need for emission measurements on Open Area Test Sites. This method was established in CISPR 15 edition 9 as an acceptable alternative to a traditional OATS test configuration that required antennas and calibrated test sites. It is specified for the frequency range from 30 MHz to 300 MHz. The CDNE method and the associated limits up to 300 MHz can be only applied for EUTs with clock frequencies below or equal to 30 MHz. In such a case, the product is deemed to comply with the requirements between 300 MHz and 1000 MHz.
CISPR 15 edition 9 also specifies that the mains supply cable of the EUT should be terminated with a CDNE positioned on the reference-ground plane for the OATS, SAC or FAR measurement method.
Unlike CDNs, CDNEs are not appropriate for immunity measurements
The Tekbox TBCDNE-M2 is designed for EUTs that do not have a PE (Earth) connection. Tekbox offers the TBCDN-M3 model for measuring EUTs with PE, Neutral, and Line connections.
