Oscope Frequently Asked Questions
Question number FAQ-1064
I want to display the result of subtracting two power spectra using fundamental frequency analysis (FFT analysis).
Using the "ExpressionItem" in the fundamental frequency analysis, you can calculate and output the difference and sum of the power spectrum.
- On the basic frequency analysis screen, set the two data sets you want to calculate, "Before Countermeasures" and "After Countermeasures," as items.
- Double-click "ExpressionItem" to display the "Inter-Item Calculation" screen and enter the calculation expression.

- You can enter an expression by double-clicking on an item or operator in the list.
Enter the expression SQRT([1]*[1]-[2]*[2]) and click the OK button.
- 4. After execution, the difference between the data before and after the countermeasure will be displayed as a brown line.
Line: Data before countermeasures, Red line: Data after countermeasures
Last updated: 2020-09-02