Signal Generator Inclue RK1212 Series & RK1316 Series instrument . Audio Signal Generator Uses The Advanced Voltage-Controlled Oscillation Circuit,It Can Produce Stable,Low Distortion Sine Wave Signal.The Output Amplitude Frequency With Digital Display,Sweep Frequency Range Can Reach More Than 1:1000,The Beginning And The End Point Of The Sweep Frequency Can Be Set Arbitrarily,And With The Delay Output,Short Circuit Protection And Other Functions.