Sleeve assembly having the following features: - the sleeve assembly comprises a first sleeve having a hollow outer sleeve conductor (ST-05), which transitions at one end face into a base (ST-09), an inner sleeve conductor (ST-11) which is galvanically connected to the sleeve base (ST-09) being positioned in the interior of the first sleeve along a central axis (ST-07), - a second sleeve is arranged in the interior (ST-19) of the first sleeve, - the second sleeve has a sleeve base (ST-15) on one end face and an opening side (ST-27) on its opposite end face, - the second sleeve is arranged, with its sleeve base (ST-15) and its opening side (ST-27), in the interior space (ST-19) of the first sleeve so as to be rotated by 180° relative to said first sleeve, - the second sleeve ends, with its opening edge (ST-25), with an axial clearance before the base (ST-09) of the first sleeve, - a lateral clearance extending transversely or perpendicularly to the central axis (ST-07) is formed between the second outer sleeve conductor (ST-25) and the first outer sleeve conductor (ST-05), by means of which clearance the second or inner sleeve is arranged so as to be galvanically isolated from the first sleeve, and - the first and the second sleeve (ST1, ST2) are connected only by a galvanic connection between the base (ST-29) of the second sleeve and the inner conductor (ST-03), which penetrates the base (ST-29) of the second sleeve, characterized by the following further features: - an electrically conductive housing having a cut-out in the electrically conductive housing, - the outer or first sleeve, together with the second sleeve, which is arranged in the interior (ST-19) of the first sleeve, is arranged in the cut-out in the electrically conductive housing such that a capacitor is formed between the inner wall of the cut-out in the housing and the inserted outer sleeve conductor (ST-05) of the outer or first sleeve. - the sleeve assembly comprises a first sleeve having a hollow outer sleeve conductor (ST-05), which transitions at one end face into a base (ST-09), an inner sleeve conductor (ST-11) which is galvanically connected to the sleeve base (ST-09) being positioned in the interior of the first sleeve along a central axis (ST-07), - a second sleeve is arranged in the interior (ST-19) of the first sleeve, - the second sleeve has a sleeve base (ST-15) on one end face and an opening side (ST-27) on its opposite end face, - the second sleeve is arranged, with its sleeve base (ST-15) and its opening side (ST-27), in the interior space (ST-19) of the first sleeve so as to be rotated by 180° relative to said first sleeve, - the second sleeve ends, with its opening edge (ST-25), with an axial clearance before the base (ST-09) of the first sleeve, - a lateral clearance extending transversely or perpendicularly to the central axis (ST-07) is formed between the second outer sleeve conductor (ST-25) and the first outer sleeve conductor (ST-05), by means of which clearance the second or inner sleeve is arranged so as to be galvanically isolated from the first sleeve, and - the first and the second sleeve (ST1, ST2) are connected only by a galvanic connection between the base (ST-29) of the second sleeve and the inner conductor (ST-03), which penetrates the base (ST-29) of the second sleeve, - an electrically conductive housing having a cut-out in the electrically conductive housing, - the outer or first sleeve, together with the second sleeve, which is arranged in the interior (ST-19) of the first sleeve, is arranged in the cut-out in the electrically conductive housing such that a capacitor is formed between the inner wall of the cut-out in the housing and the inserted outer sleeve conductor (ST-05) of the outer or first sleeve.