A microprocessor controlled time measurement system MNSC with eight separate stop channels started in groups of four channels is presented. The system uses integrated ECL counters with built-in gates as first stages counting a 500 MHz clock signal. The further counter stages are built up with STTL and LSTTL. Time intervals up to 20 ms can be measured with a resolution of 2 ns. The result of an experiment is shown where the arrival of a detonation front is measured with MNSC.