NI USB-4065 External Trigger slow sample rate

[OPullin]

Hi,

I am measuring voltage with the above device, using mesaurement complete and an external trigger.

The resolution is set to 3.5 digits, but I am getting a reading approximately every 100ms. The manual

states that at this resolution, the sample rate should be 3000/s. How can I get this faster rate?

Thanks.

[crossrulz]

Could you supply some code?  The 3kS/s is when in waveform capture mode.  So I am not surprised by you not reaching that.  But the 100ms makes me think the DMM is doing some configuring.  Did you turn autoscale off?

[OPullin]

Hi crossrulz,

Thanks for the reply. I can't find any reference to auto scale, only autorange (which is only used for immediate sampling).

I have modified my code (I made a slight error) and am now getting 25ms per read.

You mentioned that the 3k/s is for waveform capture, do you know what sort of sample rate I should be getting?

Much appreciated

[crossrulz]

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OPullin wrote:  I can't find any reference to auto scale, only autorange (which is only used for immediate sampling).

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Autorange is what I meant.  I must have had oscilloscopes on the brain when I typed that.

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OPullin wrote:  do you know what sort of sample rate I should be getting?

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Not a clue.  But as long as you are getting the rate you want, that is what matters.

[kirsch]

Configure the device for multi-point acquisition and you should get more measurements per second.

[OPullin]

Hi all,

Thanks for the reply. I managed to improve the sample rate massively by reducing the settle time. 

Cheers