Gate Pulse Magnitude: -200 V typical Pulse Repetition Rate: 30Hz-5kHz Internal OSC Pulse Width: Two separate gate pulse outputs, 50 Ω termination Fixed Width Pulse: Pulse width is determined by the internal delay line selected. Typical: 3.5 nsec FWHM 2.5 nsec rise time, 2.6 nsec fall time Variable Width Pulse: Pulse width is continuously adjustable with a 10-turn potentiometer used in conjunction with a 2 position range switch. Typical: Range 1: 18 to 400 nsec (rise time 8-9 nsec) Range 2: 35 to 2,500 nsec Pulse Delay Control: The time interval between the trigger pulse and the output pulse (propagation delay) is continuously adjustable from nominally 25 nsec to Introduction 11 above 1700 nsec. With the variable width pulse, the minimum propagation time is approximately 30 nsec. A 10-turn potentiometer/3-range switch arrangement provides: Typical: Range A: 25-53 nsec Range B: 50-270 nsec Range C: 80-1700 nsec • Pulse Jitter: Less than 1 nsec • Repetition Rate Generator: Internal trigger pulse generator is continuously variable, with 10-turn potentiometer, from approximately 30 Hz to 2 kHz. It produces pairs of trigger pulses allowing precisely synchronized triggering of another device; e.g., a laser. Two connectors are available for these pairs. The two trigger pulses are delayed relative to one another in a variable range of 7-70 µsec. Both the pulse amplitude and the delay can be varied according to the user’s requirements. Contact the factory. • Trigger Detector: The FG-100 includes a sensitive trigger detector for the detection of low level trigger pulses from an external source. Trigger sensitivity level is variable from approximately 0.1 to 2 V (although higher level trigger pulses can be used). Either positive or negative trigger pulses can be used, at a rate of up to 5 kHz. An optional optical trigger input is also available. Contact the factory for details. • Enable-In/Inhibit-In: Two digital lines that allow the pulser to be activated or deactivated using either TTL low or TTL high signals. The two inputs are logically ANDed; Enable In must be at logic high (+5 V) AND Inhibit In must be at logic low (0 V) to activate the pulser. Units are shipped with Inhibit In jumpered to ground internally (pulser enabled), allowing pulser enable/disable to be controlled via the TTL level applied to the Enable In BNC alone. Applying a logic high to this input enables the pulser. A logic low disables it. The controller NOTSCAN output applied to this input will prevent the pulser from being triggered when the array is being scanned. Removing the internal jumper from the Inhibit input allows the pulser to be deactivated by applying a logic high to the Inhibit In BNC connector. • Pulse Monitor: A low level output that can be used to determine the timing characteristics of the variable gate pulse. Note that this is not a TTL pulse and can not be used as a trigger. Also, note that the Pulse Monitor pulse may show considerable distortion at short pulse widths AC 105-250V 50/60Hz 50W
