Trigger and Gate Only Returns One Channel

Question

Hello all,
I am trying to write a VI that will run in the background and start writing some data to a file when it detects a signal. For detecting the signal, the VI uses the "Trigger and Gate" express VI to see when the input voltage goes above a treshhold. Then I plan to write whatever data comes out of the "Triggered Signal" output.
There are 8 channels, with the 6th one being the channel that is being checked for a signal. I have configured the "Trigger and Gate" express VI to trigger when that channel reaches 0.01 V and it does trigger when that happens. However the problem is that the "Triggered Signal" output only contains data for the first channel, and I want it to contain all of the channels.
I don't have access to the device that will be sending the data right now, so I am testing the VI using the "Read From Measurements File" express VI. It reads from a file that contains data that I saved from the device previously. When I set the the "Retrieve segments of specified size" for the express VI, so I can see how it progresses, I get the error I mentioned above. When I set it to "Retrieve segments of original size" (the file contains only 1 segment, so it reads all data), everything works as expected.
Any ideas as to what I am doing wrong?
I attached the VI with some sample data.
Attachments:
data.csv ‏4834 KB
trigger-and-gate.vi ‏112 KB

Answer 1

Hi krizka,
There are two really good examples that can be found using the NI Example Finder (help -> find examples). These are under Hardware Input and Output -> Analog Measurements -> Voltage  
Cont Acq&Graph Voltage-Int Clk-Analog Start.vi
Cont Acq&Graph Voltage-Write Data to File (TDMS).vi 
These will give you a good start point. Please feel free to ask if you have any questions
Joe Daily
National Instruments
Applications Engineer
may the G be with you ....