Common mode absorbing device

Common mode absorption device (clamp)

CMAD 1614 is a common mode absorption device (clamp) designed to attenuate unwanted common mode currents on coaxial cables and unshielded cable bundles. The device consists of precision-cut ferrite half-toroids embedded in a grey plastic body, with a floating bearing for the toroids to ensure optimal contact between the ferrite surfaces. Two quick-release fasteners allow the clamp to be opened and closed in seconds.

Function and application

CMAD 1614 is used to reduce common mode currents (also called braid currents) on cable connections during measurements. The device accepts cable diameters of up to 26 mm, making it possible to enclose cable bundles or coaxial cables without disassembling connectors. The data sheet specifies a frequency range for the CMAD 1614 of 30 MHz–200 MHz and a usable range from 10 MHz to 1 GHz.

• Precision-cut ferrite half-toroids in a plastic body housing
• Special floating bearing for toroids for improved contact
• Quick-release fasteners for fast opening/closing
• Can accommodate cables/coaxial cables up to 26 mm in diameter

Typical applications

The datasheet describes direct use for suppressing unwanted common mode currents on both coaxial cables and unshielded cable bundles. This is used to improve reproducibility in field-bound emission measurements, where defined termination conditions for the cable sheath can be crucial. The standard text refers to CISPR 16-1-4 as a reference for the use of absorption clamps.

Calibration and documentation

Each CMAD 1614 is supplied with individually measured calibration data. The device can be calibrated with the optional "CAL CMAD 1614" calibration adapter as described in the manufacturer's documentation.

View manufacturer's datasheet

Specifications

• Product name: CMAD 1614
• Specified frequency range: 30 MHz – 200 MHz
• Useful frequency range: 10 MHz – 1 GHz
• S11 (30 MHz): 0.6–0.75
• S11 (200 MHz): 0.4–0.55
• S21: < 0.25
• Max cable diameter: 26 mm
• Housing material: PVC
• Housing dimensions: 66 x 70 x 414 mm
• Weight: 3.2 kg
• Specified according to: CISPR 16-1-4
• Supplied with individually measured calibration data

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