I have too much digitization noise in my data for the range I've selected.

I have a 16-bit DAQ card, but each digitization level is ~10 microVolts, instead of 1/(2^16) of my range. I set my range to be 1mV to -1mV. I'm getting data from a photodiode which its current is converted to voltage through a 100 kilo-ohm resistor.
Thanks!
Bethany

Hi Bethany,
The smallest input range of that DAQ Board is +/- 200mV. At that range, you can expect to get ~6.4 microVolts Resolution. This is discussed in much greater detail in the M Series User Manual:
http://digital.ni.com/manuals.nsf/websearch/9477D6DF1FE5A72986256FAB00633DE4?opendocument
Search for Analog Input Range, and it will be your second ranked item. This will show you how this resolution is calculated, and what it will be for your board.
Have a Great Day!
George

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I have too much digitization noise in my data for the range I've selected.

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