User Manual

30 Operation Theory
DAQ/PXI-2005/2006/2016 AI Data Format
The data format of the acquired 16-bit A/D data is Binary coding.
Table 7 and 8 illustrate the valid input ranges and the ideal transfer
characteristics. The converted digital codes for DAQ/PXI-2005/
2006/2016 are 16-bit and direct binary, and here we present the
codes as hexadecimal numbers.
Software conversion with polling data transfer acqui-sition
mode (Software Polling)
This is the easiest way to acquire a single A/D data. The A/D con-
verter starts one conversion whenever the dedicated software
command is executed. Then the software would poll the conver-
sion status and read the A/D data back when it is available.
Description Bipolar Analog Input Range Digital code
Full-scale Range ±10V ±5V ±2.5V ±1.25V
Least significant bit 305.2uV 152.6uV 76.3uV 38.15uV
FSR-1LSB 9.999695V 4.999847V 2.499924V 1.249962V FFFF
Midscale +1LSB 305.2uV 152.6uV 76.3uV 38.15uV 8001
Midscale 0V 0V 0V 0V 8000
Midscale -1LSB -305.2uV -152.6uV -76.3uV -38.15uV 7FFF
-FSR -10V -5V -2.5V -1.25V 0000
Table 4-3: Bipolar analog input range and the output digital code on the DAQ/
PXI-2005/2006/2016
Description Unipolar Analog Input Range Digital code
Full-scale Range 0V to 10V 0 to +5V 0 to +2.5V 0 to +1.25V
Least signifi-cant bit 152.6uV 76.3uV 38.15uV 19.07uV
FSR-1LSB 9.999847V 4.999924V 2.499962V 1.249981V FFFF
Midscale +1LSB 5.000153V 2.500076V 1.250038V 0.625019V 8001
Midscale 5V 2.5V 1.25V 0.625V 8000
Midscale -1LSB 4.999847V 2.499924V 1.249962V 0.624981V 7FFF
-FSR 0V 0V 0V 0V 0000
Table 4-4: Unipolar analog input range and the output digital code on the DAQ/
PXI-2005/2006/2016