NI USB-9229/9239 User Guide and Specifications
14
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Specifications
The following specifications are typical for the range 0 to 60 °C
unless otherwise noted. All voltages are relative to the AI– signal on each
channel unless otherwise noted.
Input Characteristics
Number of channels................................4 analog input channels
ADC resolution.......................................24 bits
Type of ADC ..........................................Delta-Sigma (with analog
prefiltering)
Sampling mode .......................................Simultaneous
Data rate range (
f
s
)
Minimum .........................................1.613 kS/s
Maximum ........................................50 kS/s
1
Data rates (
f
s
) ..........................................
,
n
= 1, 2, ... 31.
Master timebase (internal)
Frequency ........................................12.8 MHz
Accuracy..........................................±100 ppm max
Operating voltage ranges
2
Overvoltage protection ...........................±100 V
Input coupling.........................................DC
Input impedance (AI+ to AI–) ................1 M
Ω
1
Full performance requires the use of a USB 2.0 Hi-Speed host controller and USB 2.0 hubs.
2
Refer to the
Safety Guidelines
section for more information about safe operating voltages.
Measurement Voltage, AI+ to AI–
Nominal (V)
Typical (V)
Minimum (V)
NI USB-9229
±60
±62.64
±61.5
NI USB-9239
±10
±10.52
±10.3
50kS/s
n
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