why "wait for operation complete" error ?

[ttom972]

HI,

When I use the vi "Read multiple waveforms" there are an errors that appears in the VI "wait for operation complete" and I cannot found the cause of this error ! Can you bring me your help on this suject ?

Thanks you beforehand

Here my vi in LV2013

[ttom972]

HI,

When I use the vi "Read multiple waveforms" there are an errors that appears in the VI "wait for operation complete" and I cannot found the cause of this error ! Can you bring me your help on this suject ?

Thanks you beforehand

Here my vi in LV2013

[crossrulz]

It would have helped if you would have stated that this was for a Tektronix 7000 series scope.

I see two possible issues here:

1) The scope never sees the trigger and therefore never sees a waveform to capture

2) The scope is setup to continuously capture waveforms.  Since the scope isn't stopping, it won't report being complete.

[ttom972]

Hi,

Excuse me I forgot to mention the driver using for the scope. There are two waveforms displaying in the scope and this vi isn't pending of a scope trigger il should display the waveforms continuously. If I don't want stop the scope during an acquisition and delete this error when I using this vi, what solution I need use ?

Thank you beforehand.

[crossrulz]

Try just using the Read.vi (Found in the Data subpalette).  You will want to change the polymorphic case to be multiple waveforms to acquire both of your channels.  I still think you will want to stop your scope's acquisition to make sure everything is time synched.

[ttom972]

Hi crossrulz,

When i use the vi "Read.vi" (in the data subpalette) which is the same as in my program, the same problem appears. I did a test by stopping my scope's acquisition and I have always had this problem that not allow me to observe waveform in labview.

I using the vi "Fetch.vi" (in data subpalette) that allow me to delete this error and to have the waveforms in Labview, however with this vi I cannot recover the waveforms of scope several channels.

[crossrulz]

Yeah, just looked inside of the Read and saw the Wait OPC, which is what I think is causing the error.

Just put the Fetch VI inside of a FOR loop (that's what the Read does).

[ttom972]

Okay, I will try to make your idea and I will say you if the problem are resolved.