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Coupling decoupling network CDNE M2



Coupling decoupling network CDNE M2
  • Product Description
  • Main features
  • Technical parameters
    • Commodity name: Coupling decoupling network CDNE M2
    • Commodity ID: 1064819526349770752
    • 品牌11: SCHWARZBECK
    • 描述: The CDN coupled decoupling network can be applied to EMI testing, typically based on the standard CISPR 15 for product testing of lighting fixtures. In addition, CDN can also be tested for conducted immunity according to the standard IEC 61000-4-6.

      The CDN coupling and decoupling network can be applied to EMI testing, typically for lighting product testing according to the standard CISPR 15, and the CDN can also conduct conducted immunity testing according to the standard IEC 61000-4-6.

      But special attention: CDNE cannot be used for immunity test.

      Regarding the detailed impedance characteristics, there are very clear requirements in CISPR15, the frequency range is 30~300MHz, and the interference voltage is output through the BNC port of CDNE, and the voltage division coefficient of this port is 20dB.

      The built-in current compensation coil of CDNE can ensure at least 30dB decoupling between EUT and AE, which can ensure that interference signals will not be brought into EUT test results.

      In order to ensure safety, all interfaces use safety plugs. We recommend using 4mm safety banana plugs for test connections.

      In order to verify the performance of CDNE, some standards need to introduce a common mode reference point. The common mode reference point of CDNE is the short-circuit point of the unshielded cable.

      In order to meet the nominal value of the verification CDNE (ie common mode impedance, voltage division factor) need a low inductance, low resistance short circuit jumper.

      This adapter is optional. It consists of two parts. There is a shorting bridge (CA CDNE M2 Part A) and an adapter kit (CA CDNE Part B).

      One of the most important properties of a CDNE is the coupling attenuation (other expressions: correction or voltage division factor VDF) between the EUT port and the BNC measurement port. This attenuation is documented as part of each device's calibration certificate. If the coupling attenuation should be calibrated in a real emissions measurement setup, a resistor of 100 Ω is required to adapt the 150 Ω of the CDNE to the 50 Ω measurement system. For this purpose, we offer an optional adapter SR100-6W.

      There is a resistor attenuator built into the BNC output to ensure matching. According to standard CISPR/A/944/CD Figure J2, a value greater than 6db is required. According to the design, the attenuation of the internal circuit is 9.5dB. With the built-in attenuator of 10.5dB, the total attenuation is 20dB. The measurement port is therefore closely matched to 50Ω, replacing an external attenuator.

  • Frequency range

    30 – 300 MHz

    line type

    2Line, unshielded

    EUT/AE interface


    Output Interface

    50 Ω BNC

    maximum voltage

    400 VDC,277 VAC 50/60 Hz

    Maximum current


    common mode impedance

    150 Ω +10 Ω/ -20 Ω

    phase angle

    0° ±25°

    Maximum EUT RF output voltage

    140 dBμV

    Maximum measurement port voltage

    5 V

    EUT- measurement port pressure division coefficient

    20 dB ±1.5 dB

    EUT-AE decoupling capability

    >30 dB

    Ground terminal

    4mm terminal, M4 screw


    104 mm x 104 mm x 127 mm



    Internal Circuit Diagram

    CISPR/A/944/CD, Fig. J2

    Standards compliant

    CISPR 15/EN 55015

      Partial pressure coefficient

      Symmetrical impedance characteristics

      Nominal Impedance Characteristics

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