How make a cluster become a graph?

[EduU]

I understand now, sorry was my mistake!

and I really don't thought about it...

How can I acquire the data as waveform?

but I think I have a problem with that

I use the USB-6009

in Analog I/O the voltage is about +10/-10V

so I make a game with resistor to get the RMS value

the real value I read is something about 0-10V

and than I multiply each value for a constant so I get the value I want

like that:

But I don't know if you are talking about that!

I will wait your answer! Thanks

[EduU]

I tryed it:

But the graph was like that:

 

So I think, I'm commiting a mistake in somewhere!

[Dennis_Knutson]

Click on the polymorphic selector (the part that says analog 2D DBL etc) and change it to 1D waveform

[EduU]

Well Dennis I already use a DAQMX read 1D waveform to measure 2 temperatures

I will post the hole VI so you can take a look what i'm doing

and maybe give me some help or give me some tips to get better!

Thanks

Message Edited by EduU on 10-14-2009 12:33 PM

[Dennis_Knutson]

Do NOT use two separate DAQmx Reads for the same task. Use one! Configure the single DAQmx Read to return waveform datatype just like you already did and use the Index Array function or Array Subset function to get the channels you want. You can apply the scaling factors directly to a 1D waveform array. I've modified your example but since you did not post the subVI, I have no idea what it is doing.

[hecmar.arreola]

I'm having a hard time comprehending the exact problem of the OP.

Some things to point out:

1. A "Graph" only knows the last thing you supplied to it.  A "Chart" on the other hand, has memory.  For beginners who would like to display data in "real time" charts tend to be easier to use than graphs.

2. Dennis has pointed out that you should consider using the waveform datatype.  The waveform datatype (and arrays of waveforms) are very useful as a lot of built-in functions can use the waveform datatype as input (they are polymorphic).

3. If you must use a graph indicator as oppose to a chart, I've attached a VI that I use to buffer Waveform data for a graph.  You supply the 1D Array of Waveforms in any format, supply a "Window Size" in seconds, and it will output a waveform suitable for a graph indicator.  This is really only useful for graphing and displaying data, don't use this method to actually save your data.  Let me know if you need this saved as a previous version.

-Nic

[EduU]

Well I'm using LabVIEW 8.6.1

if you can save it as a previous version for me

it would be fine!

Thanks

Dennis, 

I saw your example but I need a 2D array to connect on my subVI RMS 4V4I

I upload the subVI's in my last post! I understand your idea but I have one doubt

I will have 6 AI/O to voltages and currents

and 2 AI/O to temperature, the program will know which channel is voltage and current and which channel is temperature?

because in the temperature graph I only want to see 2 plots!

Thanks

[EduU]

I was looking your example Dennis and I have one doubt here:

I put the graph to considerate time stamp

so now I have the real time from acquisition

but I want X-axis have 1sec

and it's 1,2sec at the moment

how can I change it to only 1sec?

As you can see at X-axis I have a 1.2second and I need only 1 sec

like 09:12:10 and 09:12:11

You can see I have some space in graph that dont have any waveform

How can I fix it?

Thanks

[Dennis_Knutson]

Right click and select X Scale>Formatting. Change number of digits to 0.

Right click and select X Scale. Unselect 'Loose Fit'.

[EduU]

Ok thanks now it's fine!

more one doubt:

In the temperature graph I only want to show 2 plots

because the 0-5 is voltages and currents

how can I hide it? and only show AI6 and AI7?

I tryed but the color of the plot white too

but when i started the white colors stay in front of the others!

Have some way to put the colors of these plot like transparent? or something like that?

and I need to create a 2D array to connect to my subVI RMS 4V4I

how can I make one, with a 1D waveform??

Thanks Dennis!

Message Edited by EduU on 10-15-2009 07:57 AM