I do not see the waveform correctly in the VI

[perikillo]

Hi,

I'm trying to visualize a waveform from the oscilloscope (Rigol DS1064B) into the labview. The VI I am using is the example of Rigol (is attached). I do not know what can be the problem, all I do is choose the correct VISA resource name and click run continously?? I have to do something else?

More information in case it is useful:The signal input in the oscilloscope is 1000,000MHz and 5Vpp. And the scale of the oscilloscope is 500us and 1V. In the beggining of the VI the scales are -0,5 to 1 for amplitude (y axis) and 0 to 0,004 for time (x axis). But when I run the VI scales change to -1 to 1 for amplitude (y axis) and 0 to 1100 for time (x axis) and only see a horizontal line on the 0.

Anyone know what could be the problem?

Tanks in advance.
 

[Ranjeet_Singh]

You are running you while loop in 100ms delay, How you will recognize the new updated data?

[Dennis_Knutson]

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@Ranjeet_Singh wrote:

You are running you while loop in 100ms delay, How you will recognize the new updated data?

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???? What is the relevance of this?

perikillo,

As you can see, the VI issues an autoset. The graph is also set to autoscale on the x and y axis as well as loose fit so the initial x and y values are not relevant.

What do you actuall see on the scope's screen?

p.s. Never, ever use Run Continuously until you know what it does. It is a special debug mode.

[perikillo]

On the oscilloscope I see a correct sinusoid, which comes from the generator. But in the VI I see only a horizontal line.

[Dennis_Knutson]

The Read can be executed by itself. Open that and run it.

[perikillo]

Do you mean run the attached file (to this post), right? And what result would give me the VI? I should see the waveform in the graph of the Read VI?

[Dennis_Knutson]

Of course you should see the waveform. You just need to select the VISA Resource Name.

[perikillo]

Ok, thanks a lot. Tomorrow I will try it (today I have not the scope) and post the results.

[Ranjeet_Singh]

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@Dennis_Knutson wrote:

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@Ranjeet_Singh wrote:

You are running you while loop in 100ms delay, How you will recognize the new updated data?

---

???? What is the relevance of this?

perikillo,

As you can see, the VI issues an autoset. The graph is also set to autoscale on the x and y axis as well as loose fit so the initial x and y values are not relevant.

What do you actuall see on the scope's screen?

p.s. Never, ever use Run Continuously until you know what it does. It is a special debug mode.

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He is updating the waveform in 100 ms. If any new changes comes then how he will recognize it? May after 200ms old data may appear and stays till 2 sec hence looks like old datas still there

[perikillo]

I tried using the VI Read and the result is the same, a horizontal line, nothing changes. I don't understand because doesn't work if it is only an Rigol's example. What do you think could be the problem. By the way the communication is USB.