PCI-6111 to PCIe-6374 analog in 12-bit vs 16-bit

[eafRockStarr]

Hi I have a C# client that is using the DAQ MX libraries to read the analog-in using the ReadMultiSample method of an AnalogSingleChannelReader object. The PCI-6111 card's AI was 12-bit and for the PCIe-6374 it is 16-bit.  The data coming back from the ReadMultiSample method is not as expected using the PCIe-6374 so I am wondering if anyone has any thoughts on this? 

[santo_13]

Could you please elaborate on what you mean by "not as expected"?

As long as it returns double values, it is working as expected.

https://www.ni.com/docs/en-US/bundle/ni-daqmx-net-framework-40-api-ref/page/ninetdaqmxfx40ref/html/m...

The bitness of the ADC has an impact on the resolution of the measurement and not the data type of the measured value.

[eafRockStarr]

I have a pure higher-level software background so this is a bit out of my wheelhouse, but the input going into the NI card is from a SED (secondary electron detector).  With the PCI-6111 I get a nice smooth image with nice smooth transitions between dark & light areas of the image.  When using the PCIe-6374 with no other software changes the images that I am getting show a minimal transition between light and dark areas with much of the image washed out.  I am getting essentially the same image with either card but the PCIe-6374 lacks detail.  I would expect there to be more detail in images coming from the PCIe-6374 card.

[santo_13]

Both instruments vary substantially in specifications, and "hopefully," whoever decided to replace 6111 with 6374 considered those differences and their impact on the measurements.

https://www.ni.com/docs/en-US/bundle/pci-6110-6111-specs/resource/370980a.pdf

https://www.ni.com/docs/en-US/bundle/pcie-6374-specs/page/specs.html

Do you know if the wiring is correct?