Chart History Length in Loop

[Wuffi]

Hello everybody out there using LabVIEW,

The graph of my virtual instrument is only showing 3 values simultaneously although I updated the "Chart History Length..." variable from 1,024 (default?) to 4,096.

To give a few more information: I'm using LabVIEW to plot the values to of DMM of the myDAQ device. In order to generate a graph, I repeat the measurement in a for-loop and send these values to a graph.

Could anyone point me towards additional diagnostics to run in order to pin down the problem?

Kind regards

[RavensFan]

Is it possible your X-axis is set to only show 3 values?  Right click on the X-axis and set it to auto-scale.

[Wuffi]

Thanks a lot for your answer.

When I use random numbers (from the function palette) as input, the diagramm is showing all values and the x axis gets dynamically rescaled, which is exactly what I want.

As soon as I use the myDAQ DMM, only 3 values are displayed.

[RavensFan]

Then post your VI.

We can't debug paragraphs.

[StevenHowell]

Can you post your code for review as well?

[JÞB]

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@RavensFan wrote:

Then post your VI.

We can't debug paragraphs.

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Sure we can.  I'll bet you a beer that there is a miss configured DDT in there somewhere. 

[Wuffi]

Excuse me. Please find attached the VI.

I started to use LabVIEW only recently.

Therefore, I am not an expert.

[JÞB]

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@Wuffi wrote:

Excuse me. Please find attached the VI.

I started to use LabVIEW only recently.

Therefore, I am not an expert.

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That's ok,  you know enough to post and follow advice.   You'll be an expert in no time 

[Wuffi]

Thanks. That's encouraging, but I'm not afraid it's not that easy.

[RavensFan]

I don't see any reason why your chart wouldn't show more points once you have set the X-axis to autoscale.

What I do see is that your VI will execute the For Loop 5 times, and that will be as fast as the DAQ Assistant can return a data point.  If you keep hitting the run button, you'll see more data points in groups of 5.