710 Leading Edge Discriminator



The model 710 is a high-performance, eight channel, leading edge discriminator packaged in a single-width NIM module. It features independent threshold and width controls, a fast veto for inhibiting, a prompt linear summed output, and a versatile output configuration with four updating outputs per channel.

The 710 has high input sensitivity of -10mV variable to -1volt via a 15-turn front panel control. A front panel test point on each channel provides a DC voltage equal to ten times the actual threshold to insure accurate settings.

A unique summed output, common to all eight channels, delivers -1mA of current for each activated channel, thus allowing a fast decision to be made on the number of channels simultaneously hit. Up to 16 channels can be "OR'D" directly by cable to other summed outputs providing a versatile scheme to form a trigger.

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

Output durations are continuously variable via a front panel control over the range of 4nSec to 150nSec. The updating design permits deadtimeless operation which is desirable for fast coincidence applications at high rates. The 710 has four high-impedance current switching outputs per channel. They are configured as one pair of double amplitude bridged outputs, one normal NIM level and one complemented NIM level. When only one output from the bridged pair is used, a double amplitude NIM pulse (-32mA) is generated, useful for driving long cables with narrow pulses. Two normal NIM levels are produced when both of the bridged outputs operate into 50 ohm loads. The output risetimes and falltimes are typically 1.5nSec, and their shapes are unaffected by the loading conditions of the other outputs.

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