ASCII Data from Tektronix DPO 4000 Series

[_natalie_]

Hi again,

Earlier I asked about how to get data from the oscilloscope so that later it can be saved as a csv file to a remote computer.  I was directed to look at the Transfer Waveform Data from the Oscilloscope.

I followed the tests and I used the CURVe? query to get the ASCII data.  

The output can be something like this as a string:-110,-109,-110,-110,-109,-107,-109,-107,-106, -105,-103,-100,-97,-90,-84,-80

These aren't ASCII values that I recognize especially since there is a negative sign.  Does anyone know how to convert this back using LabVIEW?

Thanks!

[billko]

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@_natalie_ wrote:

Hi again,

Earlier I asked about how to get data from the oscilloscope so that later it can be saved as a csv file to a remote computer.  I was directed to look at the Transfer Waveform Data from the Oscilloscope.

I followed the tests and I used the CURVe? query to get the ASCII data.  

The output can be something like this as a string:-110,-109,-110,-110,-109,-107,-109,-107,-106, -105,-103,-100,-97,-90,-84,-80

These aren't ASCII values that I recognize especially since there is a negative sign.  Does anyone know how to convert this back using LabVIEW?

Thanks!

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Usually the manual will tell you what the output means.

[Joannick]

I think it could help if you show the vi you are using, or at least a screenshot. I can't garantee it will lead to an answer.

[Kyle97330]

That scope uses an 8-bit analog to digital converter and it's giving you the raw outputs of that.  So the smallest value your scope can read with its current scaling and offset is -128 and the highest is 127.  

I recommend you download the Textronix VISA drivers and either use them, either instead of your own VIs or as a reference for interpreting the CURVE? command.  But basically, they get the XY increments, origins, and offsets with:

WFMP:XZE?;:WFMP:XIN?;:WFMP:YMU?;:WFMP:YOF?;

[ben64]

Have a look at the WFMInpre:YZEro command in the programmer manual, the formula to convert the CURVE? query results is given in this section.

Ben64