Aquisition donne

[santatra2]

Hello everyone...

I am newbie in labview ...

I ' uses Adlink DAQ-2214 for a voltage aquisition of 2 channel (ch0 and ch1).

ch0 on the signal for speed and the Ch1 signed for vibration

I want to know if we could read the variation  frequency of a signal on the CH0 '' the voltage is -10V to 10V '

thank you

[GerdW · Accepted solution]

Hi santatra,

sure you can. As long as Shannon-Nyquist criteria is met you can determine any frequency in your signal…

[santatra2]

Thank you for your response...
I use Labview 2015 with Win XP
I communicate you will seal my LBB
I 'already have both value (rotational speed and vibration) that I want displayed on an XY graph but I' just gets a point that wanders in the graph.

how to have a graph deroulant based on both value
NB : the vibration Y axes and the rotation axes X

thank you very much

[GerdW · Accepted solution]

Hi santrata,

but I' just gets a point that wanders in the graph.

A graph just displays the data you provide it - it doesn't has it's own internal data buffer…

You need to collect the data in a buffer (aka "array")!

As I cannot open your LV2015 VI right now that's all I can say.

Why did you save it within a LLB? That doesn't make sense for a single VI…

[santatra2]

Thank you for your  reply
I tried to put the values in a table,

the problem it's that vibration is types "Dynamic", while rotation types "precisions dual 64-bit" and I can not put all in array.

may be that there are "vi" in labview who do directly?

thank you

[GerdW · Accepted solution]

Hi santrata,

you can always convert DDT data to more useful datatypes - you will find functions to do so in the ExpressVI functions palette!

[santatra2]

Here is my diagram

[GerdW · Accepted solution]

Hi santatra,

what a "nice" image! (sarcasm!)

Notes:

- You could clean up your VI to have straight wires (atleast)!

- Attaching a real VI (or a snippet) would allow us to check the parameters of your ExpressVIs…

- Whats the point in converting a DDT wire to a 2D array to convert that back to DDT?