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**LMS Test.Lab: The Versatile "Double X" Cursor**

In LMS Test.Lab, the Double X cursor is a wonderful and powerful cursor for data analysis.

**Double X: The Basics**

To add a Double X cursor to a display, right click and choose “Add Double Cursor -> X” (Hint: Hold down the CTRL key when right clicking on the display to always get the cursor menu)

On the Double Cursor, the left and right cursors can be moved (*Picture 2*):

- Left Cursor: Moves both cursors together at the same time. The cursors stay fixed distance apart
- Right Cursor: Moves only the right cursor, changes the distance between the two cursors

Set the cursor to the frequency range desired to perform an analysis.

**Double X: Max**

Need the maximum over a frequency/rpm range? Want to know the frequency/rpm the max occurs at?

Right click on either the left or right of the Double Cursor and select “Calculations -> Max” (*Picture 4*).

The maximum appears in cursor legend, along with the frequency at which the maximum value occurs (*Picture 5*).

Right click on the cursor legend and choose "Copy Values" to paste the maximum value into Excel.

**Double X: Frequency Calculator**

Looking at some time domain data and wondering what the frequency is present (*Picture 6*)?

Right click on the Double X cursor and select “Calculations -> Freq (1/deltaT)” as in *Picture 7*.

**Double X: Linear Regression**

Trying to figure out your average acceleration from a RPM vs time trace (*Picture 8*)?

To determine the rate of speed increase (ie, the acceleration) from the RPM vs time, right click on the cursor and choose "Calculations -> Linear Regression" (*Picture 9*).

The "Linear regression" function fits a line to the data between cursors. The slope and offset of this line are displayed in the legend.

Right click on the legend and choose "Copy Values" to copy/paste the slope and offset to Excel.

**Double X: RMS and Color**

Want to know the RMS level over a specific frequency range?

Right click on the Double X cursor and choose “Calculations -> RMS” as shown in *Picture 11*.

Want to highlight the frequency range of interest with a little pizazz? Add a bit of color by right clicking on the Double X cursor and selecting “Properties”.

Turn on “Fill with color:” (*Picture 12*) and select some beautiful colors (*Picture 13*)!

Even mix colors with overlapping frequency ranges!

**More LMS Test.Lab Display Tips:**

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