Error when running VI to acquire data from multiple channels

Hello there, I am currently trying to write a LabVIEW program interfacing with the Agilent 34970A data acquisition unit. Have managed to get seperate VIs to acquire temperature and voltage data and to graph the data. Running them separately is fine.
However when I try run one after the other, (ie, run temperature acquisition VI, then voltage acquisition VI; or vice versa) the first one runs OK, but upon trying to run the second one I get a VISA error along the lines of "VISA write". When I try to run the first VI again, that one fails to acquire readings as well. Any way I can rectify this problem? (Want to combine the VI's into a single program.) Thanks!

Hi Laeral:
You should be able to just open one VISA session then write and read both commands then close the session at the end. This sounds to me like an error that comes from trying to open two VISA sessions to the instrument at the same time. I have attached some very basic LabVIEW VISA code that writes and reads two different commands. Hopefully it will get you started.
Regards,
Emilie S.
Applications Engineer
National Instruments
Attachments:
Basic VISA Example Two Commands.vi ‏39 KB

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out.print(odiRef.getUserExit("EXT_MISSING_FIELD")) ;
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****** ORIGINAL TEXT ******
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Engr_tech wrote:
i think i already have the tdms for data logging.as far as the tdms data logging is concerned,when i enable the logging mode to "read and log" the data logged inside the excel sheet would be seperate for current and voltage.?
Is it practically possible to acquire data from 4 different channels and plot them.if yes,then am i right to assume that all i need is to modify the current VI for four channels having all of them in parallel.
Yes, you are logging directly to a TDMS file. This is definately the best route for data logging from a DAQ. The currents and voltages will show up as different channels in the same group.
To add more channels, just add them to your DAQmx task. The logging will handle it with no issue. Your calculations will also a little work to add the extra channels. Same for the graphs, since you are using seperate charts.
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Error when running VI to acquire data from multiple channels

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