USE IT$!$

Runtime Spreadsheet

Storage.vi It is often an advantage to "stream data to disk"

during a data acquisition program's runtime $($i$.$e$.,$ add each data sample to an open

computer file at the instant it is acquired$),$ rather than store the entire collection of

data samples at the close of the VI's execution. With this approach, if your com$-$

puting system crashes before the data acquisition program has completed its full

execution, the data up to the time of the crash have been saved, a feature that is

especially valuable for long data runs.

Using the block diagram shown below, create a VI that streams sine$-$wave data

to a file. The Set File Position icon $($with its from input wired to end$)$ configures the file

storage process so that each new data sample is appended to the end of the open file.Once completed, run your VI$.$ As the program starts, a dialog box will appear,

asking for the desired file path of the to$-$be$-$created spreadsheet file. After you enter

the path, the VI will execute its $10-$second runtime. When the program completes

execution, use Read Spreadsheet to view the created spreadsheet file. If all goes

well, you should see about eight cycles of the sine wave as shown here.

Read

Spreadsheet.vi Front Panel

Finally, run your VI and abort its execution $($using the button in the tool$-$

bar$)$ before it has fully completed its $10-$second run. Then use Read Spreadsheet to

verify that the spreadsheet file produced contains all of the data samples up to the

time that the VI was halted.