THE MODEL 802 The Model 802 is a 50 MHz general purpose laboratory pulse generator. The instrument gives you full control in primary pulse triggering and shaping plus simultaneous TTL, TTL and sync pulses. The primary pulse output has controllability in rate, width, delay, upper level, lower level and a choice of positive, negative or complementary outputs. The TTL and TTL are of fixed levels and rise times that are standard for use with compatible devices. The primary pulse has rise and fall times of 5 ns or less. The output is ±10 volts with a 500 termination. Upper and lower pulse levels are fully adjustable through ±10 volts, a 20 volt window. Termination may be internal, at the load or both. Single pulses or pulse pairs may be triggered; pulse width may be trigger controlled; continuous pulses may be gated for a 'burst' output. 1.2 SPECIFICATIONS 1.2.1 Versatility Four Simultaneous Pulse Outputs Fixed TTL level sync, TTL and TTL outputs, and variable amplitude output pulses are available over a 5 Hz {200 ms) to 50 MHz (20 ns) frequency range. For optimum pulse characteristics from the variable amplitude pulse output, an internal 500 load can be selected via a front panel control. Operational Modes Continuous; Generator oscillates continuously at selected frequency. Triggered: Generator quiescent until triggered by external TTL pulse or front panel control, then generates one pulse. Gated: Generator oscillates at the period rate selected by the front panel control when gate input is high. Generator quiescent when input is low. First cycle is synchronous with rising edge of gating signal. Double Pulse: Same as continuous, triggered and gated, except two pulses for each period. Time to second pulse is controlled by delay control. Double pulse at all outputs except sync.