CDN EMCL-20 / CDN EMCL-35 EM Clamp

CDN EMCL-20 & CDN EMCL-35

EM Clamp for immunity tests

IEC / EN 61000-4-6 Ed. 4.0

·         The preferred coupling and decoupling devices are the CDNs, for reasons of test reproducibility and protection of the AE. However, if they are not suitable or available, clamp injection can be used.

·         Often, clamp injection needs to be applied to multi-pair balanced cables because suitable CDNs might not be available.

·         The EM Clamp establishes both capacitive and inductive coupling to the cable connected to the EUT.

The EM-Clamp (in contrast to the conventional current injection clamp) has a directivity ≥ 10 dB, above 10 MHz, so that defined impedance between the common-mode point of the AE and the ground reference plane is no longer required. Above 10 MHz, the behavior of the EM Clamp is similar to that of a CDN.

EMCL-20 clamp for frequency range 10 kHz - 150 kHz 

The EM clamp is developed for test frequencies above 150 kHz. For product standards with testing requirements in the frequency range of 10 kHz – 150 kHz the EMCL-20 clamp cannot operate like normal with a 6dB attenuator. The insertion loss for an effective coupling is too high. Therefore, a matching network CDN EMCL-NW_10 should be used. This network transforms the low impedance of the EM clamp to an acceptable impedance for the amplifier. With this matching network reproducible tests are feasible till 10V at 80% AM – without the 6 dB attenuator.

The matching network CDN EMCL-NW_10 is not required for the EMCL-35.

EMCL-20 clamp for frequency range 10 kHz - 150 kHz

Calibration unit of the CDN-EMCL-20 (included in scope of delivery of the EMCL -20 and EMCL-35)