LabVIEW
New to Labview. Is there a TDMS VI I can use to decimate TDMS files
You can do them one at a time. If the data types are different between channels this is required if they are not there is the possibility to read multiple channels at once but has other potential issues (like if all channels don't have the same number of samples).
So what you will want to do is create an array of string, and in that array name all the channels you want to do this task for. Then wire that into a for loop with autoindexing on. Then do your steps on each channel one at a time, reading at the offset, then writing to the new file under the same channel name.
@BreakerBreaker wrote:
All of the channels have the same data type and the same number of samples. I was able to create an array of string and name all the channels but it is unclear to me how to wire it into the for loop(which one and where)? I attached the modified VI. Where do I go from here or am I even on the right track? You are being VERY helpful by the way, Im just a new bee at all this. Thanks for your patience.
I'm confused, does the attatch VI not work? It looks like it would work just fine, for all groups, for all channels, read a single data point then write to a new file. What about it isn't working? I realize you have only one group so the first for loop will only run once but there is nothing wrong with that.
It's really nice seeing somebody post your code almost completely unaltered. What are you trying to do with the Path to String Array? That was the only change you made, so there must be some reason.
The problem with the channel names (at least in your test tdms file) is that they are all "Untitled XXX" where XXX is some number. The TDMS API reads all of these as "Untitled". That is why you are getting it read as a single channel. So you need to change the program that wrote those TDMS files so that there are meaninful channel names.
@BreakerBreaker wrote:
Is it possible to gererate the channel names using Daq Assistant?
Yep. Just right-click on the channel and choose Rename. The name information should stay will the waveform. You are reading the data as a waveform, right?
@BreakerBreaker wrote:
Is it possible to gererate the channel names using Daq Assistant?
Yep. Just right-click on the channel and choose Rename. The name information should stay will the waveform. You are reading the data as a waveform, right?
