1.Introduction ISDS220A/ISDS220B dual-channel digital oscilloscope, with "low-cost, high-performance" as the design goals. well-designed bandwidth of 60M, 200M sampling rate, 2 channels, alternating support X, Y and XY alternating pattern of two-channel virtual oscilloscope, spectrum analyzer . Meanwhile, ISDS220B has DDS and Sweep function. DDS support 5 kinds of waveform output, Sine wave can output up to 20M. The device communicate with the PC via high speed USB2.0. Introduction 1, sleek design, compact size, USB2.0 interface, no external power source. 2, more suitable for notebook computer, product line maintenance, be used easily on business. 3, a small size (mm): 150 (L) x100 (W) x30 (H), easy to carry. 4, high refresh rate, high sampling rate, 200MS / s real-time sampling. 5, the software supports: Windows XP (SP3), Win7 (32), Win7 (64). 6, waveform add, subtract, multiply, X-Y display. 7, the waveform data can be time-and voltage output to EXCEL, BMP, OSC. 8, FFT spectrum analysis. 9, full-function signal generator, and supports adjustable voltage amplitude and offset. 10, a computer can connect many DSO. 11, secondary development library that provides an example of VC development.