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National Instruments Corporation
A-1
A
Specifications
This appendix lists the specifications for the SCXI-1521/B modules. These
specifications are typical at 25 °C unless otherwise noted.
Analog Input
Number of channels ............................... 24
Voltage gain ........................................... 42
Input coupling ........................................ DC
Overvoltage protection........................... ±11 V powered on and off
Inputs protected...................................... <AI 0..24>
Transfer
Nonlinearity ........................................... 0.02% max
Gain error
After calibration
1
............................. 0.1% reading max
Before calibration
2
.......................... 4.0% of reading max
Input offset error .................................... 7 mV max
1 mV typ
1
This is the error after software correction. Gain error is taken into account in the software correction coefficients stored in the
onboard EEPROM. These constants are applied automatically when using NI-DAQmx.
2
This is the error before software calibration.
