The Model 715 is a high performance, five-channel constant fraction timing discriminator packaged in a single width NIM module. It exhibits typical time walk plus slewing of ±75pSec from threshold to 100 times threshold.
Each channel has independent threshold adjustment, output width adjustment, and shaping delay. The threshold is variable from -25mV to -1Volt and is monitored from a front panel test point providing a DC voltage ten times the actual threshold setting. The outputs are non- updating with the output width is adjustable from 5nSec to 150nSec. The shaping delay circuit is made complete by connecting the appropriate cable length between two LEMO connectors, allowing the user to optimize time resolution by easily matching the characteristics of each detector. A monitor is also provided to observe the constant fraction shaped pulse to verify that the delay is correct.
A fast veto input allows simultaneous inhibiting of all five channels to reject unwanted events early in the system. Similarly, a bin gate will inhibit the entire module when applied via the rear connector.
The 715 has three individually driven, current switching outputs per channel. Two are normal NIM levels and one complemented. They have typical risetimes and falltimes of 1nSec helping to preserve the excellent timing characteristics. The output transition times and shapes are unaffected by the loading conditions of the other outputs.
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