The Model MS-12 is a multi input scaler that provides on a single ISA card 12 scalers. The first scaler can be configured as a timer with 10 ns time resolution (crystal time base). Two scalers can be preset. Utilizing the carryout function a 64 bit preset capability is available.The 12 inputs are designed to accept TTL or positive NIM pulses at rates of up to 100 MHz - the pulse-pair resolution is 10 ns. A 1 kOhm or 50 Ohm input impedance can be selected. All 12 scalers are connected to a common GATE and a LOAD (to start value / reset) line. The start and stop function can also be synchronized by the "GO"-Line as used by the new Model MPA-3 Multiparameter System. Each scaler has its own gate input, a common gate is also provided. Up to four MS-12 can be operated in one PC and the status of all scalers displayed in one window. A very useful feature is the four channel digital ratemeter display where four scalers of a MS-12 card can be selected to show the counting rate in a bargraph display.