Error due to the small size of settling in OR-6211

Hello, I have the following question on NI6211.

I use multi-channel system and signals to different channels differ greatly. For example, 10 mV to ch 1 and a few volts to 2 ml. The sampling rate is big (100 ksps / s), so there is no crosstalk between channels due to little break-in. Sources have large output impedance - 10 kOhm. The question is how can I calculate the amplitude or crosstalk (in dB) for the conditions of this measure. Accuracy to convert different intervals contained in the specification in paragraph "settling for multi-channel temporal." But I do not understand these data - why 90 ppm of step size is + - 6 of the LSB. I have thoght that step size is equal to LSB. And what source impedance are account bound to this data? And performance graph time receive values much more error (10 000 ppm).

Thank you for your attention.

Specification for NOR-6211: http://www.ni.com/pdf/manuals/371932f.pdf

If you view the chart from the top on the right side of this page, we show the chart for several source impdences.

In the paragraph you are referring to:

You will notice at the top we no it's for a "full scale step.  Means the passage of the input range maximum to minimum range between channels (for example on the range of ±10V, reading 10V on ch. 0-10V on ch. 1).  That's what 'step' made reference to, not LSB on the ADC but rather the extent of the difference between the readings.

The chart you will need is the graph on the right marked "settling error Versus time for Source of different impedances.

If you are sampling 100kS/s total on two channels, you have a time to convert 10uS.  Source 10kOhms impedance, this means that you'll see an error about 4000ppm of the size of your stage.  If you go from 10mV to 2V, this amounts to an error in subject 8mV on readings.

As your first signal is so small, you would probably better served by adding a Buffer of Gain unity between your source and your channels to reduce source impedance, which will give you much better set on-time performance.

Tags: NI Hardware

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