NI USB-9219 User Guide and Specifications 18 ni.com
Overvoltage protection
Terminals 1 and 2............................±30 V
Terminals 3 through 6,
across any combination...................±60 V
Input impedance
Voltage and Digital In modes
(±60 V, ±15 V, ±4 V)......................1MΩ
Current mode...................................<40 Ω
All other modes...............................>1 GΩ
Accuracy
Cold-junction compensation
sensor accuracy.......................................±1°C typ
Mode, Range
Gain Error
(% of Reading)†
Offset Error
(ppm of Range)†
Voltage, ±60 V ±0.3, ±0.4 ±20, ±50
Voltage, ±15 V ±0.3, ±0.4 ±60, ±180
Voltage, ±4 V ±0.3, ±0.4 ±240, ±720
Voltage, ±1 V ±0.1, ±0.18 ±15, ±45
Voltage/Thermocouple, ±125 mV ±0.1, ±0.18 ±120, ±360
Current, ±25 mA ±0.1, ±0.6 ±30, ±100
4-Wire and 2-Wire* Resistance, 10 kΩ±0.1, ±0.5 ±120, ±320
4-Wire and 2-Wire* Resistance, 1 kΩ±0.1, ±0.5 ±1,200, ±3,200
4-Wire and 3-Wire RTD, Pt 1,000 ±0.1, ±0.5 ±240, ±640
4-Wire and 3-Wire RTD, Pt 100 ±0.1, ±0.5 ±2,400, ±6,400
Quarter-Bridge, 350 Ω±0.1, ±0.5 ±2,400, ±6,400
Quarter-Bridge, 120 Ω±0.1, ±0.5 ±2,400, ±6,400
Half-Bridge, ±500 mV/V ±0.03, ±0.07 ±300, ±450
Full-Bridge, ±62.5 mV/V ±0.03, ±0.08 ±300, ±1,000
Full-Bridge, ±7.8 mV/V ±0.03, ±0.08 ±2,200, ±8,000
* 2-Wire Resistance mode accuracy depends on the lead wire resistance. This table assumes 0 Ω of lead wire resistance.
† Typ (25 °C, ±5°C), Max (–40 to 70 °C)