• 0.5 Hz to 50 MHz Frequency Range • Full 20 Volt Output • Variable Transition Times • Second Channel Output Option • GPIB and Stored Settings Wide Frequency Range Model 859 provides 0.5 Hz (2s periods) to 50 M Hz (0.02 με periods), in a 5Va inch high, rack mountable instrument that is fully programmable for systems applications. Pulse Capabilities Pulse widths can vary from 10 nanoseconds to 1 second,delays to 1 second, transition times from 5 nanoseconds to 25 milliseconds, and output levels up to 20 volts. All pulse parameters have a resolution of 3 digits. Extreme accuracy and microprocessor assisted programming ensure that the generator is producing exactly the pulse you want without having to verify its output. Output may be one pulse per period, double pulses or symmetrical square. Pulses may also be complemented. Mode Versatility Operating modes include continuous, triggered, gated burst (1 to 10,000 pulse periods), external width mode to reconstruct or shape an external signal, and unique time interval mode for extremely long pulses. Trigger status is always shown. Front panel annunciators give positive indication of the selection of manual triggering (pushbutton or GPIB), external rising or falling edge triggering and of trigger presence. Second Channel Option Second channel output is available for dual pulse applications. Second