| Oscillograph is a often used instrument in electronic measurement,it is a electronic instrument which can observe,measure,register diversified instantaneous physics phenomenons and show relation with time. Making use of A/D conversion DSO changes analog signals to digital signals,and places it to memorizer,when it will display, we will take out content of memorizer, making use of D/A conversion DSO changes digital signals to analog signals to display.A software design method is putted forward that is based on random sampling DSO in this paper,combining 100MHz DSO by UESTC studying and making, and this paper emphasis on function of parameter measure and the actualization of intercommunion between machine and people.Adopting technique of digital realization,DSO not only possess determine the nature measure capacity of conventional simulation Oscillograph,but also can finish function of parameter measure which conventional Oscillograph cannot finish.And it has wave form mensurable measure and analytic ability. DSO designed in this paper has functions of parameter measure——peak peak,rms,mean, period, frequency,and has function of cursor measure. Range parameter measure contact sampling dot to range,time parameter measure contact sampling dot to timebase. Frequency measure adopt method combining software and hardware.The actualization of intercommunion between machine and people of DSO designed in this paper adopt keyboard interface, keyboard adopt 5×7 matrix layout, keyboard scancode is adopted by row and arrange scanning, scan working adopt circle inquire, serial port finish connecting keyboard to main computer.Displaying part adopt LCD screen to show, actualization of color displaying adopt cortrol three bit of a dot to realize, menu part adopt data configuration,which demand all menu consolidate. This paper finish aforementioned parameter measure and the actualization of intercommunion between machine and people. |
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