6930 Single Channel Analyzer/Window Discriminator



The Model 6930 is a 100 MHz discriminator with three modes of operation offering unprecedented versatility in a small rugged aluminum enclosure. This unique circuit can be operated as a conventional Leading Edge Discriminator (LED); an Amplitude Risetime Compensated Discriminator (ARC); or a Window Discriminator (Delta E). The two thresholds are independently variable with the Lower Level Threshold (LLT) range from -10mVolt to -1Volt and the Upper Level Threshold (ULT) range from -25mVolt to -1Volt.

An internal delay control is used to shift the LLT timing to occur at the peak of the input pulse for both the ARC and Delta E modes. Also the delay may be used to eliminate the need for long timing cables often required for coincidence applications.

A three position, locking toggle switch selects the type of discriminator desired.

LED MODE - Functions as a conventional Leading Edge Discriminator. The ULT circuitry is disabled leaving the LLT circuitry active. The threshold range is variable from -10mV to -1Volt

ARC MODE - Functions as a dual threshold discriminator which used the low level timing technique to eliminate time walk as a source of error in critical timing applications. An internal delay control compensates for input risetimes as slow as 25nSec.

Set-up Note: Normally the LLT is set to trigger just above any input noise or as low a level possible on the input pulse while in the LED mode. Then when switched to the ARC mode, the ULT is enabled determining the actual firing threshold desired.

Delta E MODE - Functions as a dual threshold window discriminator with the output firing when the input lies between the LLT and ULT window. An ideal device to make fast decisions on energy cuts early in the system.

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