Build Array Retaining Memory Between Executions

[AnthonyMN]

Hey everyone,

I'm fairly new to LabVIEW and attempting to design an executable to read measurements from an digital multimeter that takes measurements and builds them into an array that then transfers to an Excel document.

I've gotten the DMM up and running, I've gotten it to write to the file, but if I execute multiple times it tries to build the file using past results and the current test results.

How can I empty the system memory so that it starts fresh every time?

Right now I am using a loop which refreshes the digital measurements and uses buildarrays in order to compile all the results (shift registers to pull the arrays through). At the end of the code (stop button) they transfer to be compiled into tables.

[crossrulz]

Do you have an uninitialized shift register?  If so, that is where your data is being retained.  You could just initialize it with an empty array.

[AnthonyMN]

I think they are currently being initialized by the build array function. How would I go about initializing it on each execution with an empty array instead?

Hopefully I've attached the instrument to this post (so if I'm stating something wrong in the post it'll be in there). Thank you for the help!

[Wolleee · Accepted solution]

Hi anthony,

I attached the VI to fix the shift register issue.  When you run a vi with shift registers the register will stay in memory until you close it.  So when you run your first iteration it will start from default, then stop.  When you restart this without closing it the shift register will mantain the values from the previous run.  So simply at a constant outside the loop so you reinitialize the register every run.

[udka · Accepted solution]

-In the left side of your shift register if you don't initialize then it will use data from previous runs.
-To avoid that you can simply right click on the left side shift register and create constant.
-Get started with LabVIEW basics http://www.ni.com/getting-started/labview-basics/shift-registers

[AnthonyMN]

I marked the wrong one as a solution first but wow thank you for helping! Works perfectly and it's great to see that for the future! (Also it looks so much nicer now thank you)

[udka]

Click on Options and you can mark Not the solution.
-To clean up diagram you can use Ctrl+U