Cirrus Logic CDB5463U - Manual (Page 21)

CDB5463U
DS805DB2 21
2.8.7.4 Histogram Bin Width
This field determines the "bin width" when plotting histograms of the collected data. Each vertical bar in
the histogram plot will contain the number of output codes entered in this field. Increasing this number
may allow the user to view histograms with larger input ranges.
2.8.7.5 Data to Collect
These two check boxes allow the user to select the data types that will be collected and returned to the
PC for processing.
2.8.7.6 Cycle Count
The value in the Cycle Count field will be written to the Cycle Count register in the CS5463. The Cycle
Count register determines the length of one computation cycle. The Cycle Count value should be selected
appropriately according to the Data to Collect setting. For example, if the Data to Collect is instantaneous
current, voltage, or power it is better to set Cycle Count to 1.
2.8.7.7 Accept Button
When this button is pressed, the current settings will be saved, and the user will return to the Data Col-
lection Window.
2.8.8 Collecting Data Sets
To collect a sample data set:
1. In the Data Collection Window, press 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 Configuration Window section) and press
the Accept button.
3. The Data Collection Window should still be visible. Press the Collect button to begin collecting data.
4. Once the data has been collected, it can be analyzed, printed, or saved to disk.
2.8.9 Retrieving Saved Data From a File
The CDB5463U software allows the user to save data to a file, and retrieve it later when needed. To load
a previously saved file:
1. Pull down the Setup menu and select the Disk menu item. 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.
2.8.10 Analyzing Data
The evaluation software provides three types of analysis tests: Time Domain, Frequency Domain, and
Histogram. The time domain analysis processes acquired conversions to produce a plot of magnitude ver-
sus conversion sample number. The frequency domain analysis processes acquired conversions to pro-
duce a plot of magnitude versus frequency using the Fast-Fourier transform (results up to Fs/2 are
calculated and plotted). Also statistical noise calculations are calculated and displayed. The histogram