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Oscilloscope. The general information.
Switching of inputs.
The circuit of the external device. Calibration.
The analysis of a spectrum.
Two-coordinate mode (dynamic characteriograph).
The generator.         Additional adjustment.
The Capacity - meter.
The Voltage - Frequency Caracteriograph. 

  
The virtual oscilloscope RadioMaster is a combined device. It consist of an oscilloscope, a spectrum analyzer, LF generator, Capacity - meter and a voltage - frequency characteriograph (VFC).
   The oscilloscope allows you to watch the signals waveform in a range from 10 Hz up to 20 kHz on two channels with amplitude from several millivolts up to 200..300 volts.In comparison with a real oscilloscope this device has obvious advantages. The program determines in a digital kind the period, frequency, phase, peak and effective values of voltage. The device is supplied with additional modes, it can work as differential scope and two-coordinate scope (dynamic characteriograph). It is possible to save the images in a graphic format GIF, to send graphics to MSExcel.
   A lack of the virtual oscilloscope is the impossibility to see and to measure a constant component of voltage, that is caused by circuit feature of sound cards.
   On the screen panel of the device there are the buttons, typical for real oscilloscope, and also special means of indication, control and adjustment settle down. All elements of the panel are supplied with the emerging comments (hints), and you will understand their functions easily. The keys, duplicating screen buttons, are specified in brackets of the comments.
   If you do not have a mainframe of the Virtual Laboratory, you should make an external device by yourself (see the circuit).
   The sound card has some inputs. There are external inputs, for example Line, Microphone, and internal, the main of them is Stereo Mixer - the mixed output of the card. At work with external signals best is the linear input. Switchings of inputs and their adjustment is made in Windows, such opportunity in the program is stipulated. Press the button Mixer, then follow the current instructions.
   The oscilloscope can be tested without external device - from a virtual source of waves, for example, playing any sound file or having switched on the built-in generator. In this case specify as an input for record Stereo Mixer.
   On the screen of the oscilloscope there is the grid, on a horizontal scale - time (the value of division in micro seconds is specified in the bar X), and on a vertical - voltage in volts. The marking on a vertical scale corresponds to the channel 1. For the channel 2 is present only numbers of a scale (on the right).
   In the top part of the screen there are the signal parameters of 1-st channel in a digital kind , below - same for 2-nd channel, also shift of a phase of a 2-nd channel wave concerning a 1-st channel wave.
   On the screen there is also dark green horizontal line, which shows a level of synchronization. The synchronization is carried out on a signal of the 1-st channel. To establish a new level of synchronization you can, having clicked the mouse on the screen in a zone of 1-st channel trace at appropriate height.
   It is possible to invert the traces with the button + /- or key -.
   The oscilloscope has also a differential mode (button Y1-Y2 or key D). In this mode instead of 2-nd channel trace there will be a difference of signals 1-st and 2-nd channels.
  The export of graphics to Excel is carried out as follows. At continuous development choose input sampling frequency and speed of development so that the screen will contain a necessary interval of time. By switching in a mode of unitary development "freeze" the necessary piece of the oscillogram. Then press the button Excel. If necessary specify parameters of sample for carry from an initial array to the Excel table. This operation should be made in a window of Points of sample on the bar, which occurs in a right - bottom corner of the screen. Establish number of points (lines of the Excel table), after typing press a key Enter. The process of data transfer is started by the button in the right part of the bar. Thus the window MSExcel opens, there is a filling of 3 columns of the table (while the filling proceeds, the vertical scrolling button moves - don't operate in Excel). In the first column of the table there is a time in milliseconds, further voltage on 1-st and 2-nd channels in millivolts. If necessary save the XLS file.
   To switch to a mode of the spectrum analyzer you should press a Spectrum On/Off or key Z.
   The coordinate oscilloscope mode (dynamic characteriograph) is activated by the button Y2 (Y1) On/Off or key X.
   The parameters of oscilloscope substantially depend on parameters of a sound card of your computer. So with old types of cards, at which input sampling frequency no more than 44,1 kHz, the frequency range of the device is limited from above. Using the switch of input sampling frequency, available on the panel, test your sound card. Already at 96 kHz it is possible confidently to consider waves up to 20 kHz. Opposite, the infra low frequency waves better to investigate at low input sampling frequency.
   The word length of sampling is established equal 16, this provides high enough accuracy.
   If your sound card has no a line input, use the microphone input, but thus one channel will be lost, so the mode Y2 (Y1) will be impossible.
  Do not connect an input of the device to mains 220..230V even through the large resistance or auto transformer. At the best you will lose the computer
  The program remembers settings, and restores them at the next start.
  Your questions and wishes write to zapisnyh@yandex.ru . My page is at www.zapisnyh.narod.ru (in Russian).