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To open a data file, select "Open..." from the "File" pulldown menu (circled left in red). A File Open Dialog box will open up (as shown below). To reload the current file, select "Reload" from the "File" pulldown menu. You will need to use "Reload" when you resize the application. |
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Note that only the binary files (*.bin) that have been recorded with DynaDAQ appear in the dialog. Select one of the files and press the "Open" button OR double-click the selected filename. A "Processing" dialog box will open (as shown below) which shows the progress as the file loads from the hard drive. |
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The Processing dialog shows two numbers (circled left in red). The rightmost number shows the total number of buffer chunks to load. The DynaDAQ Viewer loads the file in chunks. The chunk size is determined by the file's sample rate, number of channels, and the screen width of the DynaDAQ Viewer's MainGraph. The leftmost number shows the current chunk number. If the file was recorded while DynaDAQ was in normal mode (less than 6.4MB/s), DynaDAQ created a "chunk file" (as the binary file was being recorded) which the DynaDAQ Viewer uses to load the binary file VERY quickly. If the file was recorded in Enhanced mode (6.4MB/s), DynaDAQ did not create a "chunk file" therefore the viewer must create the "chunk file". This process can take up to 1/3 the record time.
For example: Let's assume that we have a binary file which was recorded at 3.2MB/s for 2 hours. This file would have been recorded in Normal Mode therefore a chunk file would have been created. This binary file would take only 15 seconds to load in the MainGraph and another 35 seconds to load in the subgraphs: A total load time of 50 seconds. Now, let's assume that we have another binary file which was recorded at 6.4MB/s for 1 hour. These two files would have exactly the same amount of data, BUT since this file was recorded in Enhanced Mode, it would take approximately 45 minutes to load this file because DynaDAQ did not create the "chunk file". *** However ***, once the file has been loaded once, the viewer will have created the chunk file. Therefore, the next time the file is loaded, it will only take 50 seconds to load. |
