Saving multiple signals to ASCII file

How can I save two (or more) signals from different sources to same ASCII file? I want to be able to compare the wanted and the actual measured signal by looking the ASCII file result...
The result file (sweep.txt) could look like this:
DC Signal mean
1                 0.99
2                 2.1
3               3.0
My little sequence looks like this
Sweep (from 0V to 5V, 0.5 steps)
Create analog signal
   |> DC signal
DAQmxGenerate
>| DC Signal
DAQmx Acquire (10 samples)
|> Voltage
Statistics
>| Voltage
|> mean
Save to ASCII/LVM
>| mean
>| DC Signal (I can't seem to add another source like this!!!)
End sweep
The way the Save step acts when trying to add another signal is rather...chaotic! You can TRY to add another signal but you can't select it, OR if you can select it it will cause an error later on...(Missing input)
And if I choose to export DC Signal and mean from the sweep output and then save it...The header talkes about "Frequency (Hz)" which is not related to the measurement at all...so it seems there are bugs in the software or my reasoning...And I can't seem to change the header either!
Shouldn't it be possible to save lots of different measurement data from different devices?!?! It seems like a normal thing to do!!
...My next sequence was supposed to measure the effiency of a regulator by sweeping the input voltage Uin (100 points) and the load resistance Rload (100 points ) and save the results in a file looking like this: (total of about 100x100 measurements)
Uin Iin Pin Uout Iout Rload Pload n
Oh and BTW i'm using Signal Express 2.5.0, is there an update availlable?
Thanks...
-Sami

I can think of a couple of issues that may be causing your frustrations.
Issue 1:
The DC signal coming from the Create Signal step is actually a waveform with multiple samples, not just a single value. The mean value is a double with one value. The Save to ASCII/LVM step is not set up to save inputs of different types to the same file. Since they can have different lengths, putting them side-by-side into the same file doesn't make sense.
Try doing just a save of the DC signal and then another of the mean value and then take a look at the output data and you'll see the difference.
Issue 2:
When you have outputs of a Sweep, the outputs are functions of the selections made in the Sweep Output tab. This allows the values of signals vs. the swept parameter, so you may have the DC signal swept against the frequency changes in the Sweep step. Check the Sweep Output tab to verify you're sending out the data you want.
Adam.

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Hope to get some help with Elements Organizer.
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Saving multiples objects into a file

I want to create a single file that has multiples things inside, like pictures (png) and texts. Does someone knows how it will be the structure of the binary file?
I'm programming a draw software like photoshop, where my layers are BufferedImages. Theses bufferedImages must be saved into a file to re-open later and edit.
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Saving multiple records into text file

Can I save multiple records into a text file at one go?
My application has a list of data displayed there and when the user clicks on the save button it will save all the records on the screen.
It works but it only saves the last record.
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I suggest writing a method that takes a SalesData[]
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Saving multiple lines in a file

ok I have a simple calculator that when you inset the text into text fiel one and when you insert text into tex input 2 when you hit the add subtract or any of the other buttons it will add the date, time, input 1, input 2, calculation performed, and answer. It is also supposed to be able to store each calculation not just one. I am kinda new to programming in Java and would love some hel here is my code
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Can Signal Express prompt the user for the next ascii file name?

I am using the following to collect data from Thermocouples and Strain Guages in our plant. It allows me to plt data every second, while recording only every 3 seconds to cut down the file size.
Big Loop-
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new user

Hi crawlejg,
You can set signal express to increment the file being created each time. But if you are looking for 1 new file each time the project runs you will have to use LabVIEW as this advanced functionality is not available in Signal Express. If you need help getting this to work in LabVIEW or have any other questions please feel free to ask!
Sincerely,
Jason Daming
Applications Engineer
National Instruments
http://www.ni.com/support

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Channel names.gif ‏4 KB

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Thanks for the reply, that has certainly fixed my issue as I wasn't expanding the channel and selecting the channel that I had renamed.
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Saving the content of JTable into a ascii file?

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2. Another way I tried is to use the "Recording Option". But how can I get all the four signals saved in one file?
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PS: I work with SignalExpress 2.5 and have a NI USB-6210 connected.

In the recording options tab you can set a stop condition to be 24 hours of data. And then select the "Restart Log Automatically" option to start logging for another 24 hours. You can also configure the logging to auto create an ASCII file once logging stops. With this configuration an ASCII file will be created every 24 hours. To enable ACSII file generation, select Tools>>Options.. And then set "Automatically export log to ASCII file to true".
I believe that you will get one ASCII file for each TDMS file. If you are logging 4 channels from the same device you should be able to log the entire group which would allow you to get only 1 TDMS / ASCII file.

Averaging values of multiple signals seperately

Hi All,
I am attempting to create a VI that will average data over a user defined amount of time (via boolean switch). The attached vi collects data once the "collect Data" switch has been triggered, when the test is over the user triggers the "average collected data" switch to get an averaged value. Please see attached VI.
THis vi works fine for a single signal. However, the ultimate goal is to be able to do this whole process for n-number of sensors throughout my test loop with a final output as an excel file.
I am pretty sure that I can get the data saved for an excel file but I cant figure out how to get all of the signals averaged seperately and placed into an array.
Any help will be much appreciated!
Thanks,
Stefan
Attachments:
Average Collected Data.vi ‏13 KB

Stefan,
When you are doing the multiple signal process, will the collection time and averaging be done for all signals simultaneously or will there be separate Collect and Average controls for each channel?
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3. Building an array inside a loop results in frequent memory reallocations. As the array gets large this will cause the program to slow down and will fragment memory. A better approach is to allocate memory outside the loop with Initialize Array and use Replace Array Subset inside the loop where the Build Array primitives are now. You will need to add another shift register to keep track of the next index to replace.
4. Loops should usually have a time delay to prevent them from grabbing all the available CPU cycles. Once you put in a real data acquisition process, that may provide the delay.
Lynn

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Per user manual, I work from the computer not the printer.
When first page is scanned am asked if I want to save, I click yes and name file.
When I scan second page am again asked if I want to save, my file name appears, I am told it already exists and asks if I want to keep or replace it.
Whichever one I click, only the second page is saved.
What am I doing wrong?
Question: How do I scan mutiple pages into a single document?
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View Solution.

I accept this solution with many thanks! It was so obvious and I didn't see it. The User Manual should mention this.

Saving multiple signals to ASCII file

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