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GF3021 Portable Multfuncton Instrument Calibrator is suitable for power plant and power grid companies for the following functon: measuring and testng department and instrumentaton classes, natonal levels measuring and testng insttutons, railway, petroleum, chemical industry and other large industrial and mining enterprises, scientfic research units, etc. The core technology functon with digital signal processor (DSP) and 16 high-speed digital converters composed of high precision work frequency communicaton terminal. The signal source is DSP and 16 high-speed digital-to-analog converters, it can control the sine wave and distorton wave signal source.