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Calibration

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Joseph R. Eoff edited this page Jan 25, 2020 · 2 revisions

Once the software is installed, it must be calibrated so that the on screen measurements work. This step also trims the viewable area so that only the screen of the oscilloscope is displayed in the software.

Calibration

  1. Start the program and select the correct webcam from the selection box:

Your camera may have a different name. The C270 webcam I use shows up as a "UVC Camera" with some hexadecimal identifier.

  1. You should now see the screen of your oscilloscope on your monitor.
  2. Click on the "Calibrate" button:

  1. The "Calibration" window will open:

  1. Turn up the backlight on the scope so that you can see the grid markings:

  2. Count the number of grid lines from top to bottom and subtract 1. For my oscilloscope, that's 7 lines from top to bottom. Subtract 1, and that's 6. Put that number in the "Vertical Divisions" field.

  3. Count the number of grid lines from left to right and subtract 1. For my oscilloscope, that's 9 lines from left to right. Subtract 1, and that's 8. Put that number in the "Horizontal Divisions" field.

  4. Use the mouse to move the cursors to mark the visible edges of the oscilloscope screen. The cursors are the triple blue lines. Click inside the cursor and move the mouse - the cursor will follow. There are two horizontal cursors and two vertical cursors. There is also a horizontal cursor in grey. One of the blue cursors will usually be hidden behind the grey cursor on start up. Just move the grey one out of the way. You only need the blue ones for the calibration.

Marked screen edges:

  1. Click the "Crop" button. The D43 display will now only show area inside the cursors.

  2. Mark the outside lines of the original grid with the cursors:

  1. Click the "Grid" button. Calibration is complete. The grid lines that the software draws on the screen should now lie exactly on the original grid lines:

  1. If the calibration isn't as exact as you'd like, click the "Reset" button and try again.

  2. Turn down the backlight on the oscilloscope. The final calibrated display looks like this:

  1. Close the calibration window.

  2. The calibration data are saved automatically during the calibration and will be reloaded each time the program starts.

You can move the calibration window around the screen if needed. On my OpenSuse Linux system, I have to press the "Alt" key and click on it with the mouse to move it.

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