LCWVAVE -Labview File

[fitch]

I am currently trying to run the lcwave on my lecroy scope and have errors coming when I am trying to accquire a waveform . the  error seems to be orignating from the sub VI

LC wave channel . I have included the error , could somebody point me in a direction as to what might be causing it . I really need this for my school project .

Thanks

[alanjb]

Hi - Alan from LeCroy Tech Support here...   What is the model number of the oscilloscope you are using?

Thanks,
Alan

[fitch]

the model number is 104Xi (lecroy waverunner)

[alanjb]

Hi Fitch,

I think the problem is that you are selecting "DC" as the coupling mode rather than "DC1M" or "DC50"  Are you using a probe?  The coupling choices depend on whether or not you have a probe attached.   If you have no probe attached, then choosing DC will cause the problem you report.

Your screenshot also shows that you have "channel A" and "channel B" both set to "channel 2".  The idea of this example is to specify two different channels to readback.

Best Regards,

Alan

[fitch]

Alan,

                 I have attached the error with 2 channels , it still seems to exist , Initially I assumed the timer could have timed out before the operation ended . I am not sure , why this seems to happen . How come the second channel does not have a DC coupling ? I have attached the error for you have to a look . Thanks for the help , I appreciate it a lot.

[alanjb]

Hi Fitch,

Your screenshot shows that you are still using "DC" for the Vertical Coupling.  Unless you are using certain current probes, use the choice that you would configure directly on the scope, which is either D1M (for DC 1Megohm), D50 (DC 50ohm) or A1M (AC 1 megohm).  The choice of "DC" is illegal without certain probes attached.

I'm not sure what you mean by the second channel not having a DC coupling... The screenshot shows that you are configuring "DC" coupling for channel A, and D1M (DC, 1 megohm) for channel B.

Best Regards,

Alan

[fitch]

Alan ,

                I think I understood what my problem was , you are right about the coupling . I have last question , I am trying to use the LCwave accquire waveform in  a loop , since I would liek to continously monitor the signal , I have a sine wave , is there way you can change the amplitude , i tried playing around with scale , the subVI , displays it well  , is there any way to adjust the VI on the outside to automatically adjust the scales or how can I adjust it . Attached is a image that would help with what I am saying . 

Thanks for all the help.

[fitch]

Alan ,

                I figured out the problem , and it is working good now . thanks for the help . Is there any way I can add calculations like RMS of a waveform , to the VI itself ?

Thanks