The Sumatron Model 500 Pulse Generator is designed to provide a controlled dual stage KYZ three wire pulse train. Two form "A" input terminals are furnished for controlling the pulse stream. The first and second inputs, when closed alone, will each provide a pulse rate that is user divided by one, two or four. The second input has priority and will select the rate if both inputs are closed. Pulse generators are normally applied to monitor permissive control contacts or to test pulse metering apparatus.