Channel name lost when averaging waveform

[mhakkine]

Hi, I am writing an application where data is acquired for DAQ continuously. Data is averaged for example every 1ms and then written to file. Problem is that channel names are lost when doing averaging. I am using 'averaged DC-RMS.vi'. I could copy the attribute before averaging and then write them back afterwards, but doesn't sound like good solution for streaming data application with several channels. Is this a bug or feature? Is there any other way to maintain channel names?

BR Marko 

Here is sample picture:

[MikeS81]

Hi Marko,

this information will be lost in the "average ..." vi, because the ouput is create new with only writing the start time, dt and the values. I think a solution for you can be to copy the specified vi and connect the input wavefrom to the build waveform functions. I think then you will have the attributes after the average.

Mike

[mhakkine]

Hi, thanks for the help. I modified the vi to pass also attributes, not a big change in code. It works fine now. Why this is not included in the original vi ??? One thing more 'Average DC-RMS.vi' is part of NI_MAPro.lvlib. I could not find out how to save own copy to different place and not to modify original file/lib. Any ideas?

BR Marko

[MikeS81]

Hi Marko,

you can copy the entire lib. Open it and disconnect the vi you want from the library.

Mike

[mhakkine]

Hi, I copied the lib, but I don't know how to disconnect vi. Could you help me?

Marko

[MikeS81]

Hi Marko,

the library is locked, i think you can´t disconnect it from the library. Sorry. But you can copy the code into a new vi.

Mike

[AlanGrwd]

Hi Marko,

I have toiled with this same problem, without finding a solution.  It seems trivial enough, yet the answer still eludes me.  Could you please post your code for others to learn from.

Thanks

Alan

 

[GerdW]

Hi Alan,

What is problematic with "connect the input wavefrom to the build waveform"? Wire the input waveform to the first input of the "build waveform" function...

[mhakkine]

Hi,

DC RMS.vi file is located in ...\National Instruments\LabVIEW 8.2\vi.lib\measure  (I am not sure can file be still modified in LV 8.6)

I modified it like this (attachment):

BR Marko

[AlanGrwd]

Hi Marko,

In spite of an unusually dense skull, I was able to work out a solution yesterday.  Armed with the hint provided by Mike, I skinned this cat slightly differently.  I know I have not modified the RMS branch; I’ll do that later.

Thanks everybody,

Alan