[en] A description is given of a set of 16 drift chamber planes built by our institute. These chambers are in operation since one year in experiment NA11 at the CERN SPS. For the readout of all chambers in this experiment (48 planes, 3528 channels) a modified version of the CERN DTR-system is used. Our modifications will be described. The performance of our chambers and the electronics will be discussed. For the monitoring of the chambers and electronics we have developed a system based on an LSI 11 minicomputer. (orig.)