Timed data collection

[jtc31909]

Good afternoon,

I have to preface this with, I don't do a lot of LabVIEW programming, mainly update and tweak existing programs that were already built. I have a VI that I'm collecting vibration data with at set hr increments. My issue is that say I set the program to collect 10 sec every hr. Well it will collect 10 sec of data that first hr, but every hr after that it will only record about 1 sec of data. This also happens if you try to collect data manually. If I press the button to collect data the first time I get 10 sec of data. Any subsequent button press will only give me the 1 sec of data. The only way for me to get the 10 sec of data as of right not is to stop and start the VI every time. Any suggestions would be appreciated. 

[GerdW]

Hi jtc,

Well it will collect 10 sec of data that first hr, but every hr after that it will only record about 1 sec of data.

You need to reset your ElapsedTime ExpressVIs when you start a new measurement (aka your 10s interval)!

Notes:

- it's a bad idea to change the label of a property node. You lose the connection between the property node and it's control/terminal, atleast by the label!

- it's overly complicated to use "value (signalling)" properties to switch a button, when you don't use an event structure.

- it's overly complicated to use property nodes at all: use a wire (or locals) instead!

[jtc31909]

Thanks! I will try that out and also take your notes into consideration to make the VI better. 

[jtc31909]

I have my ElapsedTime Express VIs set to Automatically reset after time target, but I'm still having the same problem. I must be missing something...

[GerdW · Accepted solution]

Hi jtc,

I have my ElapsedTime Express VIs set to Automatically reset after time target

I wrote: "You need to reset your ElapsedTime ExpressVIs when you start a new measurement". That might be different…

[jtc31909]

Hi Gerd,

I was able to reset my Elapsed Time VI by using a feedback node. Thanks for your help.