Extract Specific Frequency Components from Data Set in DIAdem

Updated Apr 10, 2020

Reported In

Software

  • DIAdem

Operating System

  • Windows

Issue Details

To get vibration data, I am using accelerometer sensors and NI devices such as NI 9234 and cDAQ-9178. I am then loading the vibration data into DIAdem. My data set consists of various vibrational frequency components and I'd like to extract only specific frequency components.

Solution

NI DIAdem provides Flag functions as a way to extract data from a specific frequency component across entire frequency band. Detailed steps for the Flag function are as follows.

Press Band Cursor to capture the desired frequency band on the signal in the frequency domain. (The following figure specifies a frequency of 2 to 6 Hz as Band Cursor)


Then press Set Flags. (Red box part in the figure below)


This will result in bold lines appearing on the graph within the specified Band Cursor.


Click Flags: Copy Data Points.


On the right side of DIAdem, you can see CopyXFrequency and CopyYAmplitudePeak items as shown below.


If you drag and drop CopyXFrequency and CopyYAmplitudePeak to channel data at the bottom, you can check the extracted data.


And if you want to see only the unextracted data, select Flags: Remove Data Points in Figure 4. After that, set Band Cursor as many times as you want on the remaining graph and start from item 5.