Справочник Пользователя для National Instruments USB-9221
USB-9201/9221 User Guide and Specifications
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Refer to your software documentation, accessible from Start»
All Programs»National Instruments»NI-DAQ, for information about
different methods of reading USB-9201/9221 data.
All Programs»National Instruments»NI-DAQ, for information about
different methods of reading USB-9201/9221 data.
USB-9201/9221 Circuitry
The USB-9201/9221 channels are isolated, and the device protects each
channel from overvoltages. The input signals are scanned, buffered,
conditioned, and then sampled by a single 12-bit ADC. For more
information about overvoltage protection, refer to the Specifications
section.
channel from overvoltages. The input signals are scanned, buffered,
conditioned, and then sampled by a single 12-bit ADC. For more
information about overvoltage protection, refer to the Specifications
section.
Figure 10. Input Circuitry for One Channel
Specifications
The following specifications are typical for the range 0 to 60 °C
unless otherwise noted. All voltages are relative to COM unless otherwise
noted.
unless otherwise noted. All voltages are relative to COM unless otherwise
noted.
Input Characteristics
Number of channels................................8
ADC resolution.......................................12 bits
Type of ADC ..........................................Successive approximation
register (SAR)
USB-9201/9221
Buffer
Isolated
ADC
Overvoltage
Protection
Mux
COM
AI 7
AI 0