Additional Features: Frequency Range: 0.1 Hz~4 MHz DDS Technology and FPGA Chip Design High Frequency Accuracy: 20ppm High Frequency Stability: 20ppm Frequency Resolution: 100 mHz Low Distortion Sine Wave: -55dBc, 0.1 Hz~200 kHz Front Panel Setting Save/Recall with 10 Groups of Setting Memories Applications Educational Institution Standard frequency source PLL reference signal Audio products test and adjustment Supersonic Device test Vibration test The Instek SFG-2004 is based on Direct Digital Synthesized (DDS) technology and unique FPGA design. The SFG-2004 is built with exceptionally high performance far exceeding that of any conventional function generators, at a very competitive price. Stable output frequency, low distortion, and fine frequency resolution are the most remarkable characteristics of this product series. As a result of the 20ppm stability level and output waveform accuracy, the SFG-2004 well fits a wide variety of applications, such as signal generator for experiment labs, reference signal for PLL (Phase Locked Loop), and calibration and adjustment source for electronic devices.