National Instruments NI USB-9421 用户手册
NI USB-9421 User Guide and Specifications
14
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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.
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
.............................≤5 V
Input current
.............................≤300 μA
ON state
Input voltage.............................11 to 30 V
Input current
.............................≥3 mA
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