Oscilloscope VI's

[winterfresh11]

So I have been trying to create, or find a pre existing VI, of an Oscilloscope that allows me to wire in the voltages that it reads, like from a DAQ card. So far I haven't had much luck. Any ideas?

[billko]

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@winterfresh11 wrote:

So I have been trying to create, or find a pre existing VI, of an Oscilloscope that allows me to wire in the voltages that it reads, like from a DAQ card. So far I haven't had much luck. Any ideas?

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I have an idea.  How about telling us what kind of scope it is?  (Make/model)  😉

[winterfresh11]

I don't have a Oscilloscope, I'm trying to make one on LabView or find one that lets you wire in your own voltages from a DAQ card.

[billko]

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@winterfresh11 wrote:

I don't have a Oscilloscope, I'm trying to make one on LabView or find one that lets you wire in your own voltages from a DAQ card.

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Sorry - I thought you were trying to make a real Oscope work with LabVIEW!  Wat have you tried so far?  It seems all you need is a chart to display your data?

[winterfresh11]

Essentially yes, all I really need is a waveform graph that displays my data. I have this but the problem is that it isn't triggered so my data flows through the screen, its not stable in one place like an oscilloscope. Its very simple but it works.

[JÞB]

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@winterfresh11 wrote:

Essentially yes, all I really need is a waveform graph that displays my data. I have this but the problem is that it isn't triggered so my data flows through the screen, its not stable in one place like an oscilloscope. Its very simple but it works.

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AH, you want a "Waveform Chart" with the "Chart History Length" set to the number of samples you want and an update mode set to "Scope Chart"

(Then read smaller chunks at a time so the chart actually updates at a pleasing rate for the user)

[winterfresh11]

Thanks!, that seems to be closer to what I want, but how would you trigger it to just read on section of the data so the data isn't constantly moving across the chart?

[dan_u]

Try the trigger detection VI: http://zone.ni.com/reference/en-XX/help/371361L-01/lvwave/basic_level_trigger_detect/

[Dennis_Knutson]

You must not be very familiar with a scope if you don't understand the nature of a trigger and why the display is 'stable'. A DAQ card can be set for continuous acquisition and your 'stable' display may be meaningless in any case.