M-Series (OR Power series) Coupling Decoupling Networks, commonly called CDN Mxx in IEC-61000-4-6 conducted immunity standard serve the purpose of injecting common mode disturbances to DUT (Device under test) power lines. It also decouples these signals so that it does not interfere with any auxiliary devices connected to the DUT. The M series CDNs are also used as a decoupler to block the signal from being fed back into the building mains during the test.
The M series CDNs are for un-shielded cable applications and are specific to the number of conductors within the cable used by the DUT. For example, it is not appropriate to couple noise onto a cable with 2 lines using a CDN that is designed for 3 lines. The proper noise level will not be injected into each conductor.
All Com-Power CDN-M series models have a frequency range of 150 kHz to 230 MHz. Com-Power has several models available depending on the number of lines (for example, three-phase or single-phase), current rating, and the number of phases required to power and to test the DUT.
A brief description of each model and the application is given below:
CDN-M1: One line. Typically, for the PE (protective earthing / Ground) line.
CDN-M2: 2 lines. A typical application is DC power or AC power without ground connection L+N or DC plus + DC negative.
CDN-M3: 3 lines. Single phase power connection L+N+PE.
CDN-M4: 4 lines. For three phase power connection 2L+N+PE
CDN-M5: 5 lines. For three-phase power connection 3L+N+PE
All Com-Power M-series OR Power series CDNs can handle a minimum of 25A. We also offer a 50A version of the CDN-M2 and CDN-M3. The CDN-M1 and CDN-M2 are also available for devices with 100A power connections.
Test Level calibration accessories
In order to calibrate CDNs and set the test levels, you require, specific shorting adapters, and a set of 150Ω to 50Ω adapters (ADA-515-X) is required. We recommend purchasing these adapters from Com-Power since they will be needed to calibrate the test levels before testing the actual product. Typical test levels given in IEC-61000-4-6 are 1, 3, and 10V RMS. The level setup diagram is given in the CDN M series product manual. Com-Power has put together a test system with components given the test diagram.
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All Com-Power M series (OR Power series) CDNs are supplied with calibration traceable to the International System of Units (SI) through NIST or the recognized National Metrology Institute. Com-Power also offers ISO-17025 accredited calibration.