This chapter will guide you through, step by step, how to perform a simple EMC-Scan measurement step by step.
1. Start the software by clicking on the icon on your desktop.
2. After a few seconds, this dialog box will show.
3. Click on Yes to reset the Scanner to its starting.
4. Position and calibrate the near field probe according to the procedure in “Positional calibrating the near field probe”.
5. Make sure that the near field probe is connected to the spectrum analyzer (possibly via a pre-amplifier) and that all instruments are powered on.
6. Click on the Config tab.
7. In the Spectrum analyzer box, near Setting, click on the Edit button. This is the Settings dialog box.
8. Click on the ”down arrow” on the right side of the Setting box and select a suitable setting from the list showing all stored settings. If no suitable setting is found, you may enter a new setting name and alter the settings to suit.
9. Click on the Save button.
10. Click on the Close button.
11. Click on the Config tab.
In the Spectrum analyzer box, near the Probe setting, click on the Edit button.
12. Click on the ”down arrow” on the right side of the Probe box and select a suitable setting from the list showing all stored settings. If no suitable setting is found, you may enter a new setting name and alter the settings to suit. (Refer to “Entering the amplitude correction factors of the near field probe”).
13. Click on the Save button.
14. Click on the Close button.
15. Place the test object on the Scanner table.
16. Click on the Meas. points tab.
17. Click on the General button to select 2.5 dimensional measuring points. It is also possible to generate full 3D measuring points. See “How to generate 3D measuring points” for a detailed description.
18. In the Grid / Point list box, select Grid.
19. Enter a suitable step size in the Step size box.
A small step size will generate a high-resolution measurement and a large step size will generate a low-resolution measurement.
Measuring in large steps is quicker than measuring in small steps.
20. Select measuring plane by clicking on XY plane, XZ plane or YZ plane.
21. Click on the Outline button.
Define the outline of the test object by entering values in the Area box. You may also click and draw the outline. Drawing the outline is optional, but may be valuable when you want to repeat a measurement.
22. Click on the Base level button.
Define the measuring area by entering values in the Area box. You may also click and draw the area.
23. Enter the value of Z-level in the Area box.
Z- level is the height of the probe above the Scanner table during measurement.
24. You may define “islands” with different Z-levels than the Base level by clicking on Level 1 … Level 7 buttons. This is useful e. g. to make the probe skip over high components on a PCB.
25. The measuring point can be saved (as an .MP file) for later use by clicking on the Save button.
26. Click on the Meas. EMC tab
27. Click on the Pre-Scan button to start the wide-band measurement. (The setting for this measurement was defined in step 6.)
When the measurement is finished, you will see the spectra and a list of peaks.
28. Click on the Save button to save the measurement.
(Saving is optional, but you will find it useful when you want to repeat a measurement and compare the results.)
29. Select the desired frequencies from the list of Scanned frequencies and click on the Add => button to move the frequencies into the list of Frequencies to measure.
Other ways of entering a frequency into the list of Frequencies to measure, are by double-clicking on the spectra graph or simply by typing the frequency into the Add manually box and clicking on the Add button next to it.
30. Click on the EMC-Scan button to start the narrow-band measurement of the selected frequencies. (The setting for this measurement was defined in step 6.)
31. Before the measurement is started, you will have to enter where to save the result as one or more files.
32. Enter the desired file name.
You do not have to enter the file extension because the files will automatically be named .E01 for the first frequency, .E02 for the second frequency and so on. The measuring results stored in these files can be visualized on the View Scan tab.
33. Click on the View Scan tab.
34. There are many ways to visualize the result of an EMC-Scan measurement, utilizing the features on the View Scan tab. For detailed information, please refer to page 131.
35. The result of an EMC-Scan measurement can be documented as a report in HTML format and printed out.
