708 Leading Edge Discriminator



Utilizing the most advanced technology, the Model 708 Octal Discriminator is the only octal discriminator boasting a 300 MHz continuous repetition rate capability.

The updating stage ensures deadtimeless operation for coincidence applications, while the double-pulse resolution is a remarkable 3.3nSec for counting applications. A fifteen turn potentiometer provides continuous output width adjustment from 2nSec to over 50nSec for each channel.

The threshold is variable from -10mV to -1Volt with a fifteen turn potentiometer on each channel. The threshold setting is easily determined from a front panel test point that provides a DC voltage equal to ten times the actual threshold.

Inhibiting of the discriminator can be accomplished in two ways. A front panel LEMO input accepts a NIM level pulse for fast vetoing of all channels. The fast veto is capable of inhibiting a single pulse from a 300 MHz input pulse train. Secondly, a slow bin gate via the rear panel connector inhibits all eight channels and is enabled or disabled from a rear panel slide switch.

The outputs are the current source type with one pair of negative bridged outputs and one complement for each channel. When only one output of the bridged pair is used, a double-amplitude NIM pulse (-32mA) is generated, making it ideal for driving long cables with narrow pulses. When both connector pairs are used, a normal NIM level (-16mA) is produced. The transition times are less than 1.0nSec, and their shapes are virtually unaffected by the loading conditions of the other outputs.

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