National Instruments NI USB-9237 Specifications

NI USB-9237 User Guide and Specifications 16 ni.com

The filter significantly attenuates all signals above the stopband frequency.

The primary goal of the filter is to prevent aliasing. Therefore, the stopband

frequency scales precisely with the data rate. The stopband rejection is the

minimum amount of attenuation applied by the filter to all signals with

frequencies that would be aliased into the alias-free bandwidth.

Any signal that appears in the alias-free bandwidth of the NI USB-9237

is not an aliased artifact of signals at a higher frequency. The alias-free

bandwidth is defined by the ability of the filter to reject frequencies above

the stopband frequency and equals the data rate minus the stopband

frequency.

Specifications

The following specifications are typical for the range 0 to 60 °C unless

otherwise noted.

Number of channels................................4

Bridge completion

Full and half.....................................Internal

Quarter.............................................External

ADC resolution.......................................24 bits

Type of ADC..........................................Delta-sigma (with analog

prefiltering)

Sampling mode.......................................Simultaneous

Data rates (fs) ......................................... , n = 1, 2, ... 31

Master timebase (internal)

Frequency........................................12.8 MHz

Accuracy..........................................± 100 ppm max

Nominal full-scale range........................± 25 mV/V

Scaling coefficient..................................2.9802 nV/V per LSB

0.000 kS/

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