A bright LED indicates an active, logic '1', gate condition. Versatile input and output structures provide compati- bility with NIM, ECL, and TTL standards.
Further flexibility is afforded by programming jumpers mounted on the printed circuit board.
These jumpers allow selected inputs and outputs to be assigned alternate logic functions or polarities. Depressing this switch for more than 0.5 seconds causes the time-base to retrigger at a 1 KHz rate. These functions are enabled in both monostable and bi-stable modes. This input presents a high impedance to positive sigals and 50 ohms to negative signals. The time-base triggers on the leading edge of the input pulse regardless of its polarity.