driver getting wrong readings

[rodriferfe]

Hi all,

I am trying to control a potentiostat using labview. There are drivers already built for this porpouse and everything works just fine as expected except when I try to read the results while the experiment is ongoing. I have attached 2 screenshots. In the first one the block diagram is shown. The expirement goes on until I stop the while loop. The first driver is Ndatapoints and the output is the numer of data points accumulated so far. The second driver is Getdata, the output is x,y and z which are time, current voltage. The last driver read datapoint with index int so in theory it should read the data point given by Ndatapoints. Theonly information I have related to these 2 drivers is "When reading datapoints with the IV_getdata command during an ongoing scan, be sure to check whether data is available with the IV_Ndatapoints function, before attempting to access the data". In the second screenshot I show what kind of data I obtain at every data point which is totally unrealistic. I also save the experiment data points using another driver when the measurement is finished and everything is right. I asked the manufacturer and I got this answer "Unfortunately they are not in a position to help because this appears to be a problem with the LabView program and they are not experts in all the many LabView versions.  They are confident that is the case because this problem has not been seen elsewhere".

someone could give a hand please?

Thank you very much

[JoshWY]

Hi there,

Sorry to hear you are having problems. It is difficult to assist you further without some more key information.

What is the actual device you are connecting too?

What values are you expecting?

Are there any example program provided by the manufacture you can test?

From this document below it appears there may be examples programs that you can test. It also documents information about the driver.

http://www.ivium.nl/filez/documents/Manual_2010.pdf

I hope this is a starting point.

Thanks,

Josh

[billko]

And while you are at it, please go through the tutorials mentioned on the main forum page, on the right hand side, so you can understand how to enforce order of execution through dataflow.

[rodriferfe]

Hi Josh,

Thank you very much for your help.

-I am connecting to an iviumstat

- I am expecting current values in the range of 10^-5 A and voltage between -0.4 and 0.4 V, as you can see the values I get have no relation with the ones expected.

- Actually yes, with the instalation of the software it comes a labview example which applies basically all the drivers of the ivium driver library except the one I am having problems with, so I cannot see how they use it...

I am quite lost, would it help if I attached the driver I am having problems with and the example?

Thank you very much

Rodrigo