Abstract: A filter arrangement is described for filtering a plurality of conductors which are guided from a space comprising electromagnetic fields through a separating wall to a device located in a shielded space, in which the separating wall (24) is formed by a multilayer printed circuit card (86). The printed circuit card (86) comprises a continuous internal instrument ground (32). The instrument ground (32) has as signal passage means narrow apertures (102) through which feed-through conductors (108) are passed at a short distance from the edges of the apertures (102). Electrically conductive surfaces (104,106) on the layers (94,96) adjacent to the instrument ground (32) form filter capacitors with the instrument ground (32). The surfaces (104,106) are connected to the feed-through conductors (108). Filter components (62,64,70,80,82) are formed as SMD-components and mounted on the printed circuit card (26).

Abstract: A hydraulic accumulator unit having a volume variable against the force of a spring and a restrictor are provided for eliminating slow pressure fluctuations in a measuring instrument responsive to fluid pressure, through which restrictor the hydraulic accumulator unit is connected to the fluid subjected to the pressure fluctuations. The measuring instrument measures the pressure in the accumulator unit.