Do you wanna help me?

[davy de decker]

my presentation of my work about labview is this :

i must convert signals into  a graph ,

my USB - 6008 ( from National Instruments) converts the inputs in to signals  -10v to10 v.

I have 2 different signals and i wanne put this in a graph ,

this is not my problem , because i use the XY-graph , on the x-graph voltage 1 and on the y-graph voltage 2

but  , my problem is , if a change voltage 1 you see changing the graph. but that he passed , he didnt show these.

and what i want is that if you change voltage 1/ 2 or all 2 that i have a complete line so i can show that on my presentation

what i have to do?

thank you very much

[JÞB]

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davy de decker wrote:

my presentation of my work about labview is this :

i must convert signals into  a graph ,

my USB - 6008 ( from National Instruments) converts the inputs in to signals  -10v to10 v.

I have 2 different signals and i wanne put this in a graph ,

this is not my problem , because i use the XY-graph , on the x-graph voltage 1 and on the y-graph voltage 2

but  , my problem is , if a change voltage 1 you see changing the graph. but that he passed , he didnt show these.

and what i want is that if you change voltage 1/ 2 or all 2 that i have a complete line so i can show that on my presentation

what i have to do?

thank you very much

---

an x-y graph plots x vs y  you probaply want to graph two plots vs time.

[davy de decker]

nono , if voltage 1 first 8 is and than 4 you see the line go from 8 to 4 . when the voltage is constant you see a point . but what i wanne have that he give me every point that he passed and he wil show that , that you become a graph

[Ben]

Two suggestions

1) post an image

2) post in BOTH English and your native tongue.

That will minimize the issue with language and concetrate on LabVIEW.

Ben

[Darin.K]

I am guessing that this is another classic example of not keeping around the history in an XY graph.  See for example:

[Michiel_H]

Hi Davy

According to your explanation, I do expect that you actually want to display 2 plots (lines on a single graph), where each line represents the value of a signal. To do this you can use a waveform graph or a waveform chart. Lets first see a small explanation on the 2 basic types of plot displays:

Graph: Will only plot the data you send to it. Meaning if you write a single point to the graph, he will only plot this point, if you write a new value to the graph in a proceeding loop iteration, he will erase the previous data and plot the newest data.

Chart: A chart has its own history. This means that you will see a continous plot, where every point is being added to the plot. When the history of the chart is full, a new written point will be added to the plot and the oldest one will be removed. By default, a chart has a history of 1024 points, but this can be configured.

You can check the following article on a more in depth explanation of the types and an example block diagram:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9zsSAC&l=en-US

Based on your first explanation, you will probably need a chart in this case. Make sure to take a look at the DAQmx examples you can find in Labview through Help - Find Examples - Hardware I/O- DAQmx. There might even be an example which does already exactly what you want.