Trigger writing data to file

[dgg04]

Hi,

I'm new to Labview and I am having difficulty trying to make this work correctly.

What I'm doing is monitoring the output of a transducer and when it reaches a certain critical value I want it to write the data to a file.

I have this part working okay, but I'm currently using a greater than / equal vi to check the value against the instrument stream, so when the value drops below the critical value it stops recording.  I want it to continue to record for a set number of mins after the critical value is reached.

How would I do this?

[RavensFan · Accepted solution]

Look at using the Elapsed Time Express VI.  So when the condition is first met, it triggers the VI and it will keep logging the data until the Express VI says the time has elapsed.

[dgg04]

Thanks!

I figured it out using the Elapsed Time VI like you suggested.

[Petar2015]

Hi,

I have exactly the same question,

I attach my data acquisition code to this message.

I want the code trigger "writing" whenever the amplitude of signal >=  0.5 V.

Could you please help me with this matter?

Peter

[KendalC]

Were you able to try implementing the Elapsed Time Express VI as previously suggested?  

Here is some additional documentation on the Elapsed Time Express VI for your reference:

https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/express/express-execution-control/e...