Output voltages from function generator not updating

[sak0016]

Hello,

I am writing VI that sends a sine signal to an oscilloscope. If I adjust all of the parameters of the basic function generator and run the VI it seems to work, but I would like to be able to actively change the frequency and amplitude while the VI is running. I want to be able to see the changes on my oscilloscope live. The VI "worked" until I found out that I needed to add a Timing VI to my daq AO devices. Once I added the timing VI I could no longer actively change the settings and instantly see those changes on my oscilloscope. My questions are:

1. Am I implementing the start and stop task vi correctly? Im using them inside a for-loop, a few case structures deep.

2. Why am I not able to change the freq,amp, wave-type, etc while the VI runs?

Any suggestions would be greatly appreciated

[GerdW]

Hi sak,

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@sak0016 wrote:

My questions are:

1. Am I implementing the start and stop task vi correctly? Im using them inside a for-loop, a few case structures deep.

2. Why am I not able to change the freq,amp, wave-type, etc while the VI runs?

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1. No. "A few case structures deep" sounds wrong right from the beginning…

2. Did you try to debug your VI? Is this inner case ever called? How long does this missing "Tracking-copy" VI need to execute?

You really should clean up that VI. Go for straight wires. No need to wire the "stop" condition through all the case structures: just connect the stop condition of the loop to the button! The stop button is missing its label.

Why is there an inner case structure in the "Manual mode"==FALSE case? When "Manual"==FALSE then the inner case will ALWAYS be FALSE…