THE MODEL 801 The Model 801 is a 50 MHz general purpose laboratory pulse generator. The instrument gives you full control in primary pulse triggering and shaping plus simultaneous TTL, ECL, ECL and sync pulses. The primary pulse output has controllability in offset and independent rise/faSi durations, as well as pulse width, pulse delay and a choice of positive, negative or complementary outputs. The TTL, ECL and ECL are of fixed levels and rise times that are standard for use with compatible devices. The primary pulse has minimum rise and fall times of 7 ns and a maximum of 250 ms. The output is ±20 volts with 500 source impedance which provides ±10 volts into a 5012 load. Upper and lower pulse levels are fuily adjustable through ±20 volts. External triggering can be set to any point of the rising or trailing edge of the trigger signal. Single pulses or pulse pairs may be triggered; pulse width may be trigger controlled; continuous pulses may be gated and a precise number of pulses may be triggered for a 'burst' output. Manual and external triggering is indicated by an LED on the front panel for rapid visual set of trigger level. 1.2 SPECIFICATIONS 1.2.1 Versatility Five Simultaneous Pulse Outputs Fixed level ECL, ECL, TTL and sync pulses and a pulse with variable amplitude and variable rise/fall times. Pulses available over a 5 Hz to 50 MHz frequency range (200 ms to 20 ns periods). Operational Modes Continuous; Generator oscillates continuously at selected frequency. Triggered: Generator quiescent until triggered by external signal or front control, then generates one pulse. Gated: As triggered mode, except generator oscillates for the duration of the external signal. Double Pulse: Continuous, trigger and gate, as above, except two pulses for each period. Space between pulses of double pulse controlled by delay control. Double pulse at all outputs except sync.