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NI USB-9421 User Guide and Specifications 14 ni.com
Figure 10. Assembled High Voltage Screw Terminal Backshell
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.
Input Characteristics
Number of channels................................8
Input type................................................Sinking
Digital logic levels
OFF state
Input voltage.............................≤5V
Input current .............................≤300 μA
ON state
Input voltage.............................11 to 30 V
Input current .............................≥3mA
I/O protection
Input voltage....................................40 V max
Reverse biased voltage ....................–30 V max
Input current ....................................7 mA max, internally limited
Input delay time ......................................100 μs max
Power Requirements
Power consumption from USB...............500 mA, max
Suspend mode..................................2.5 mA, max