CDB5534U

16

DS289DB6

2.3

Collecting Data Sets

To collect a sample data set:

1) In the Data Collection Window, select the Config button to bring up the Configuration Window and

view the current settings.

2) Select the appropriate settings from the available options (see the section on the Configuration

Window) and select the Accept button.

3) The Data Collection Window should still be visible. In the Setup box, select the Setup number you

want to use to perform conversions.

4) Select the Collect button to begin collecting data.

5) Data is sent directly to the PC through the USB cable. Depending on the value of the WR bits in

the selected Setup and the number of samples being collected, this process may take several min-

utes. The process can be terminated by pressing the Stop button, but if this is done, the user

should also press Reset on the CDB5534U board to bring the microcontroller out of the collection

routines.

6) Once the data has been collected, it can be analyzed, printed, or saved to disk.

2.4

Saving and Printing Data

Once collected, data can be printed or saved to a file for later use. To save or print data, click on the Output

button in the Data Collection Window. A small panel will pop up with three options:

1) Output Data File: Brings up the File Save dialog box, which allows the data to be saved to a file.

2) Print Screen: Prints the entire display, including the calculated statistics.

3) Print Graph: Prints the information in the plot area. The statistical information is not printed.

2.5

Retrieving Saved Data From a File

To load a previously saved file:

1) Pull down the Setup option and select Disk. A file menu will appear.

2) Find the data file in the list and select it. Press the Select button to return.

3) Go to the Data Collection Window, and press the Collect button.

4) The data from the file should appear on the screen. To select a different file, repeat the procedure.

2.6

Analyzing Data

The evaluation software provides three types of analysis - Time Domain, Frequency Domain, and Histo-

gram. The Time Domain analysis processes acquired conversions to produce a plot of conversion sample

number versus magnitude. The Frequency Domain analysis processes acquired conversions to produce

a magnitude versus frequency plot using the Fast-Fourier transform (results up to Fs/2 are calculated and

plotted). Also, performance parameters are also calculated and displayed. The Histogram analysis test

processes acquired conversions to produce a histogram plot. Statistical noise calculations are also calcu-

lated and displayed. For more information on Histograms, refer to Application Note 37.