National Instruments WSN-3212, Руководство пользователя и технические характеристики

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© National Instruments Corporation 27 NI WSN-3212 User Guide and Specifications
Minimum sample interval ......................................2 s
Input bandwidth (–3 dB)........................................1 Hz
Noise rejection .......................................................65 dB minimum at 50/60 Hz
Overvoltage protection...........................................±30 V between any input and common
Differential input impedance .................................20 M
Ω
Input current...........................................................50 nA
Input noise .............................................................0.5 µV
rms
Gain error ...............................................................0.02% maximum at 25 °C,
0.03% typical at –40 to 70 °C,
0.1% maximum at –40 to 70 °C
Offset error (with autozero) ...................................11 µV typical at –40 to 70 °C,
12.5 µV maximum –40 to 70 °C
Digital I/O
Number of channels ...............................................4
Modes (per channel) ..............................................Bi-directional
Modes (configurable per channel) .........................Drive High Only, Drive Low Only,
Drive High and Low, and Tristate
Power-on output state.............................................High Impedance, Tristate
DIO power supply voltage range (V
DIO_PWR
) ........5 to 30 V
Digital Input (Tristate Mode)
Input voltage range ................................................0 to 30 V
Input logical levels
High level input voltage .................................1.7 to 30 V
Low level input voltage..................................0 to 0.45 V
Input current (0 to 30 V) ........................................–160 µA to 400 µA maximum
Contact to ground detection
Contact close resistance (to ground) ..............<2.5 K
Ω
Contact open resistance (to ground) ..............>40 K
Ω
Contact capacitance ...............................................<20 nF
Digital Output
Total DIO current (all channels) ............................0.5 A maximum
Output current (one channel) (I
OUT
) ......................0.5 A maximum
Output voltage
Sourcing .........................................................V
DIO PWR
– 0.5 V – (0.9
Ω
×
I
OUT
) minimum
Sinking ...........................................................0.9
Ω
×
I
OUT
maximum