How to collect a sine wave using PCIe-6363?

[cainiao]

Hi, I just start learning Labview. I want to collect a sine wave (9V, 140kHz), but the wave collected is wired. Can someone help me please?

[PalanivelThiruvenkadam]

Before getting into the requested problem, I recommend you to go through Basic LabVIEW State Machine Architecture.

 https://www.ni.com/en/support/documentation/supplemental/16/simple-state-machine-template-documentat... 

[Bob_Schor]

You are looking at a phenomenon that engineers call "noise" (there may be some "signal" mixed in there, as the overall shape seems to show a rising curve, possibly a 60 Hz sinusoid (or possibly 50 Hz).  You seem to be sampling very rapidly, which may make you see more "noise" than "signal".

Bob Schor

[ZYOng]

How did you connect the signal? Please share your wiring diagram.

Do you follow the recommendation in Field Wiring and Noise Considerations for Analog Signals?

[cainiao]

The output connected to ai 0+, ground connected to ai 0-. The wave collected looks like a part of sine wave.

[cainiao]

Thank you, I will learn it.🙂

[cainiao]

The noise disappear. But the wave still confusing.

[GerdW]

Hi cainiao,

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@cainiao wrote:

The noise disappear. But the wave still confusing.

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According to the graph X scale you don't obey Nyquist when you want to measure a 140kHz sine wave...

[santo_13 · Accepted solution]

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Your output BNC shield isn't grounded to the power supply, it is required.

What does the board supposed to do with dual supply rail?

How are you ensuring that your board is generating the sinewave which the DAQ is supposed to capture?

[cainiao]

Thank you sir, I connected BNC ground to the power supply, the wave appears. But here's another question: It seems that the wave is a bit distorted. How can I solve it?