The display interface uses a 2.4-inch TFT color LCD screen, making operation more intuitive and convenient. Various modulation types: AM, FM, PM, ASK, FSK and PSK modulations. This design can solve inaccuracy problem of AC coupling. Output short-circuit protection: All channels can work more than 60 seconds when the load is short-circuited. The instrument adopt the Direct Digital Synthesizer (DDS) technology and provide stable, precise, pure and low distortion signals. Function: It can sweep 4 properties of signals including frequency, amplitude, offset and duty cycle; It has Linear and Logarithm two sweep types; 0.01S~999.99S sweep time; Up, Down and roundtrip sweep directions. Abundant shortcut keys and graphical user interface simplifies every operation, which makes it easy to operate. VCO Function (Voltage Control Output): Can be achieved by an external input signal: voltage controlling frequency, voltage controlling amplitude, voltage controlling offset, voltage controlling duty cycle and PWM modulations. Surface mounting technology improves interference immunity and operational life span. 100M Frequency meter function: It can measure frequency, period, pulse width and duty cycle. Max. frequency workable is 100MHz and Min. The instrument uses 14-bit high D/A converter chip (5Vpp output quantization error is less than 1mV), 250MSa/s sample rate, 14bits vertical resolution. frequency workable is 0.01 Hz. Counter Function: It has 2 coupling measure modes including DC coupling and AC coupling.