OM-USB-5203 User's Guide
Specifications
29
Current excitation outputs (Ix+)
The device has four current excitation outputs, with I1+/I1– dedicated to the CH0/CH1 analog inputs, I2+/I2–
dedicated to CH2/CH3, I3+/I3– dedicated to CH4/CH5, and I4+/I4– dedicated to CH6/CH7. The excitation
output currents should always be used in this dedicated configuration.
The current excitation outputs are automatically configured based on the sensor (thermistor or RTD) selected.
Table 19. Current excitation output specifications
Parameter
Condition
Specification
Configuration
4 dedicated pairs
Current excitation output
AI channel
I1+/I1–
CH0/CH1
I2+/I2–
CH2/CH3
I3+/I3–
CH4/CH5
I4+/I4–
CH6/CH7
Current excitation output ranges
Thermistor
10 µA typ
RTD
210 µA typ
Tolerance
±5% typ
Drift
200 ppm/°C
Line regulation
2.1 ppm/V max
Load regulation
0.3 ppm/V typ
Output compliance voltage
Relative to GND
3.90 V max
–0.03 V min
Environmental
Table 20. Environmental specifications
Parameter
Specification
Operating temperature range
0 °C to 70 °C
Storage temperature range
–40 °C to 85 °C
Humidity
0% to 90% non-condensing
Mechanical
Table 21. Mechanical specifications
Parameter
Specification
Dimensions (L × W × H)
128.52 x 88.39 × 35.56 mm (5.06 × 3.48 × 1.43 ft)
User connection length
3 m (9.84 ft) max
