Verifying User Calibration Files

After a file has been created for either RF Calibration File or IF Calibration File, follow these steps to verify that the user-calibration effect is correct.

  1. In the VSA, set the span, center frequency, external center frequency, external frequency IF, mirror frequency button, and range appropriately.
  2. Click  Input > User Correction.
  3. Clear the RF Filter and IF Filter check boxes.
  4. In the display area, click in Trace B to make it the active trace.
  5. Click Trace > Data and select Correction.
  6. Click File > Copy Trace. Select D1 from the pull-down list and click OK.
  7. Click Input > User Correction. Select the IF Filter or RF Filter check box.
  8. Click Utilities > Math
    1. Click New
    2. Click Data > Register > D1
    3. Click Operators > /

    4. Click Data > Correction

      At this point you should have an equation that looks like this:

      Data('D1') / Data('Correction1')

    5. Highlight the text in the Name text box, type MyCorrection, and click Apply.
  9. Click in Trace B to ensure it is the active trace.
  10. Click Trace > Data > Math > MyCorrection.

The trace shown is the part of the IF or RF Radio Frequency: A generic term for radio-based technologies, operating between the Low Frequency range (30k Hz) and the Extra High Frequency range (300 GHz). calibration file that is applied to the channel. Changing the span, center frequency, mirror frequency button, or external frequency values may require repeating steps 2 through 6 to get another valid representation of the user IF or RF calibration file. Note that the Math trace magnitudes are the inverse of the corrections applied to the channel.

The Correction trace under Trace Data is a composite of these corrections: VSA analog corrections, VSA digital corrections, and External Gain. This trace updates whenever the span, center frequency, external frequencies, or range change. 

See Also

RF Filter

IF Filter