Internal Clock NI USB DAQ 6212

[jyux]

Hello All,

I am fairly new to Labview.

I am trying to write a VI for triggering a device and it needs to be precise. I want to access the internal clock in the DAQ for this but I am getting a Error -201025, so I want to make sure if:

1) The DAQ has an internal clock. If yes, how can I use that?

2) I am trying to build this code for triggering one more device (2 devices in total, with certain delay in 2nd trigger signal based on 1st). Are there any examples that I can follow for such?

[GerdW]

Hi jyux,

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@jyux wrote:

Hello All,

I am fairly new to Labview.

I am trying to write a VI for triggering a device and it needs to be precise. I want to access the internal clock in the DAQ for this but I am getting a Error -201025, so I want to make sure if:

1) The DAQ has an internal clock. If yes, how can I use that?

2) I am trying to build this code for triggering one more device (2 devices in total, with certain delay in 2nd trigger signal based on 1st). Are there any examples that I can follow for such?

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• Which other device?
• What did you try? Mind to share your VI and show us where that error occured?
• What is "precise"? ms, µs, ns, as?

You can use the DAQmx internal clock with every hardware-timed task you like…

[crossrulz]

Are you referring to the AI sample clock?  As far as I am aware, the USB-6212 only has static outputs and therefore cannot output the clock.  It is sounding like you might need a cDAQ with multiple modules that you can easily share triggers and sample clocks with.

[Bob_Schor]

It sounds like you are doing something similar to the Counter-Finite Output example that ships with LabVIEW.  I'm using a USB-6212 to drive a stepper motor, with CO-0 going to a CO Pulse Freq function for Step Freq (which generates a DAQmx Channel that gives me the CO.Pulse.Term input), and Terminal 12 going to the CO.Pulse.Term that I just defined, which I use as the Step Counter.  This is basically the code from the Example -- I've broken it up into an "Initialization", a "Generate a finite number of Steps", and a "Close up Shop" routine..

Bob Schor

[jyux]

Hello,

Here is my code. It is pretty simple. 

• Which other device?
• I am trying to trigger an AFG. 
• What did you try? Mind to share your VI and show us where that error occured?
• You can find the error and code in the attached picture.
• What is "precise"? ms, µs, ns, as?
• I want a delay of 10-55 us. 

[jyux]

I am trying to replicate a TTL trigger using AO port of DAQ. So, shouldn't it be a static output?