How Do I Know the Typical Accuracy Error of PXIe-4309 for Multichannel per ADC When Sample Rate is 100kS/s ?

Updated Jun 21, 2024

Reported In

Hardware

  • PXIe-4309

Issue Details

I want to get the typical accuracy error (eg, Gain Error, Offset Error, Ghosting Error, and others) under higher sample rate (eg, 100kS/S) for 4 channels per ADC. But I don't see the data from PXIe-4309 Specifications, for example below:

image.png
Meanwhile, I can see measured Noise versus Sample Rate 100kS/s versus Multichannel per ADC
image.png

Solution

In PXIe-4309 Specifications,
  • When the specs do not display the plots there, and the sudden spike in the error graph that is pointed out, it’s a clear sign that we should not use that region if we care about accuracy. They might characterize it, but that is limited to only one sample.
  • When operating over that region, the complexity of the error makes estimation almost impossible, it varies across voltage, impedance, temperatures etc and we gave up putting a limit there.
It strongly advises NOT to use more than that region in the graph.

We have clearly stated in the first sampling rate table that if we want to use high-accuracy multichannel mode, we should use it below 20kS/s. After all, this product was initially designed for 10S/s high resolution. The fast sampling rate is just used to average and gain more resolution at 10S/s.

If we really want to use more than 100kS/s, we should only use one channel per ADC and stay within an integer divisor of 2MS/s.

Additional Information

Accuracy is different than Noise, while the noise is less complicated and can be derived.

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