Analog Oscilloscope
Virtual Digital Oscilloscope is made up of a multi-function data acquisition card which on the PXI bus, and appropriate software. When installing the virtual oscilloscope to a PC which runs windows, it will constitute a powerful digital storage oscilloscope. It called PC based oscilloscope.
1. Data acquisition card
It is the multi-function data acquisition card that produced by NI. The main function as follows:
64 single-ended / 32 differential analog inputs; 12-bit precision; 1.25MSPS sampling rate; 1.25MSPS disk write speed; input range from ± 0.05 to ± 10V; two 12-bit analog outputs; 8 digital I / O line; two 24-bit counter / timers.
2. The function of instrument
Virtual oscilloscopes have the function of real-time data acquisition, spectrum analysis, windowing processing and filtering. There are many keys of data acquisition, spectrum analysis, windowing processing, filtering and other functions are on the main panel of the virtual oscilloscope. When we press the corresponding function key, virtual oscilloscope will be entered into the appropriate sub-panel.
3. The environment of software development
The design of virtual digital oscilloscope software is using Lab Windows / CVI of the C language programming. Lab Windows / CVI can support numeric, boolean, text, strings and other data. The most advantage of it is the ability to generate the standard C code by interacting the dialog box. In addition, Lab Windows / CVI provides very rich debugging tools, including single-step execution, breakpoints, variable view, watch window, etc. These features can make the programs much easier to be debugged.
4. The main function modules.
Virtual oscilloscopes have completed the acquisition and display signal processing mainly controlled by the software.
In the data collection panel main have the following functions: set channel, set the frequency of sampling, set the methods of production, display waveform.
In data acquisition panel primarily complete the following things: spectrum analysis for the real-time signal acquisition and self-generated signal, view lines and other things.
The filtering panel includes the following features: filtering the real-time signal acquisition and self-generated signal (including single-step filtering method, multi-step filtering method and traditional methods).
5. Generation of the source file.
After setting each control in the panel, then the virtual oscilloscope can generate the code function. Specific methods as following: regard the completed panel as the current response state, then select the [All Code] of [Generate] in the menu of the [Code], selected function the main panel and exit the function in the dialog box, at last you can generate the framework code function which corresponds to the files of user interface.
6. Add code.
Automatically generated by the previous step is a function of the corresponding control framework, to make the control complete certain functions, you must add code to control the controls. One main 0 function is the entry, whose function is to initialize the process, loading the user panel and display. If you want to come true other functions, so you must continue adding code.
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Tektronix 2225 Analog Oscilloscope – EEVblog #196
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