ACQUIRE SIGNAL FROM OSCIILOSCOPE

[husssey]

hello

i am new at labview and i am doing one project.

i want to acuired a signal from oscilloscope using gpib-usb-hs cable.

so what to do first. installation of driver is complited now in programming side which thing i have to do for acquire signal.

thanks

[crossrulz]

First, you have to setup your GPIB bus.  The Initialize VI may do this for you.  After that, think about how you would manually setup the scope to acquire your waveform.  Then do it in the software.  There is likely a VI in the drivers to get the desired waveform.  Finally, when you are all done, close out the bus (likely a Close VI in the drivers to do this as well).

[husssey]

Hi thanks for reply

could you elaborate that how to  set the gpib bus and next thing is that I am using 4-channel oscilloscope so for different channel I want to read waveform in different graph in labview.

Thanks

[crossrulz]

If the drivers have an initialize VI, that usually will have the bus setup in it.

You should be able to read whichever waveform you want (one at a time).  But it really depends on the driver set.

Do you have already have drivers for this scope?  What is the model?

[Mark_Ramsdale]

To add a bit more.   You should try to talk to your scope using MAX.  This will help you pick the driver VI's to use in your code.

If you can plug in your GPIB cable and run a sample VI from the driver set, then you are good to move forward.  Often, there are small details, in that the example code usually doesn't do what you want, but at least you know your equipment is running.

Using MAX will allow you to get familiar with the steps you want the scope to go through.  It involves using the instrument commands.  The driver VI's usually are one or a small set of these commands wrapped into a VI.

One technique you can use is to run the driver VI's one at a time, start with init, then move on.  Don't forget to close at the end.  This can be more tricky, because you have to keep track of several VI's open.  This is similar to using MAX to send commands, except you don't have to type the actual commands.  Also, you have to the same com port (or GPIB address, or reference) on all the VI's.

Another suggestion is to write one VI with the driver VI's in order, as subVI's.   This way you can prove out your measurement.  Then if you want to write your actual VI, you have a working copy of the order of commands and the results.  Of course, if you are only interested in running and getting a measurement, you only need the string of VI's.   I would guess you will want to save data in a file, maybe perform analysis, and perhaps have some action buttons for different init's or inputs.  But at least you have a working copy of how the instrument process the commands in the order you desire.

[husssey]

model of oscilloscope is tds3034c

[crossrulz]

Do you already have drivers?  If not, download them from the NI Driver Finder (Find Instrument Drivers from the LabVIEW startup screen).

[husssey]

Hello

I found problem and that is I don't have library vi file of Tektronix scope .

So, for that what I have to do?

Thanks

[VA1DF]

There should be some VI files on the CD that came with the scope.  If not, visit tektronix website, and download the driver disk.

[crossrulz]

Or use the LabVIEW interface.  Via the Welcome screen, there should be a link.

LabVIEW 2011