What is the effective resolution of the Council Usb6361 ADC

I used a USB-6361 with 16-bit ADC Board. I went to simulate an implementation of County ADC bit lower and I noticed that the data collected from the 6361 seem to be 16-bit resolution. Here is an example of a part of the waveform samples (of type Double), with 0-5V range:

1.0727841521285737 V

1.09002147857432474 V

With a range of 5V and a 16-bit ADC, the bits of LS should quantize to 5V/2 ^ 16 = 5V/65536

0.0000762939453125 V

None of these samples can be represented with 16-bit precision; There are fractions remaining bits.

example: 1.09002147857432474/5V * 2 ^ 16 = 14287.12952396...

is it's 16 - bit quantum and the beach was unipolar 5V I expect an integer result.

Now, it's pretty easy to requantify 16-bit data solved, but what gives with the raw data from the USB-6361?

Why is it not 16-bit quantified for the beach?

The data do not seem to be 16-bit quantified for 0 - 10V or +/-10V or the other.

Clues here?

Ben covered the series X bipolar ranges but there are other factors that lead to what you see:

X series applies calibration in the software and it affects the HW and the returned data. On the one hand, the X series exceeded 5%, details covered in the section HAVE tied Ben manual. Also, on the application of calibration of the USB-6361 actually uses a third order polynomial for scaling - the voltage at the scale that you read don't directly correspond to the widths of code. You can make an unadjusted DAQmx reading and get direct bit of CDA. You can get the coefficients of scaling with the Coefficients of the scale property to HAVE device. If all goes well in looking at these, you can get what you need the device.

Thank you

Andrew S.

Tags: NI Hardware

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