The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise encoded CDMA system. The switching system includes a first switch and a second switch, wherein the first switch conducts a first signal according to a first control signal; the second switch conducts a second signal according to a second control signal. Preferably, the pressure valve is designed additionally at the cartridge in a radial direction relative to the direction of movement of the stepped piston. This construction allows for a more accurate determination of the location of the inspected feature, and enhances coupling of light between the immersion lens and the inspected object. The bearing blocks and with their different bores through or through are likewise embodied and arranged in a mirror symmetrical manner with respect to the vertical center line.