Description

The CTR 2 is a coaxial current target to monitor Electro Static Discharges built as required by EN/IEC 61000-4-2 Ed.2 standard. The target can be purchased as an option to the ESD generators, model dito or ESD 30.

It can be used for measurements up to 30kV. Additional attenuators are available to match the output signal with the input capability of the oscilloscope. The 50ohm conical adapter line connects the 50ohm cable to the input of the CTR 2 target. Geometrically it smoothly expands from the diameter of the 50ohm coaxial cable to the diameter of the target. If the target is made such that the impedance calculated from the diameter ratio d/D (refer to figure A2 of the IEC/EN 61000-4-2 standard document) not being equal to 50, the target adapter line shall be made such that the outer diameter of its inner conductor equals the diameter of the inner electrode of the current target.

The impedance is calculated considering the dielectric constant of the material that fills the conical adapter line (typically air). The target adapter line shall show an impedance of 50ohm +/-2% from DC to 4GHz. The reflection coefficient of two target adapter lines mounted face-to-face shall be better than 30dB up to 1GHz and better than 20dB up to 4GHz while the insertion loss shall be less than 0.3dB in the same configuration.