Problem DAQ mx in reading voltage- 2 channels

[Sim1]

Hi,

I made this VI, basically I want to read the voltage from two different channels (I have a DAQ USB6001), then write data in one spreadsheet on three columns (number of cicle or time, voltage 1, voltage 2). I have some problem with the queue and the sample rating, but above all I have this error:

Error -50103 occurred at DAQmx Start Task.vi:7220002

Possible reason(s):

The specified resource is reserved. The operation could not be completed as specified.

I have no idea why it doesn´t work, also because actually, both channels don´t work! the second one, it´s always on 0, the first one gives me that error. Can you help me? thanks!!

[crossrulz · Accepted solution]

You need a single task for both channels.  This is because they are on the same module and therefore have to use the same ADC, MUX, sample clock, etc.  So as soon as the first task is created, the second cannot since all of those internal resources are taken.

[Sim1]

Yes, I figured out just now. Now I have one DAQ read, with Nchan and Nsamp. I put N samp because is synchronized with the clock. So now I have a 2D array. how can I write this array on a txt file? I tried several times but I cannot understand (I already tried it in one another project, at the end I put only 1 sample).

[crossrulz]

Try using the Array To Spreadsheet String.  That will format your data into a format you want.  Then use the Write To Text File to actually write the data.

[Sim1]

ok thank you, I try and in just in case I open another topic as this problems is solved!