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Strain Gauge Mode
Cold-Junction Sensor
You can find the temperature T (°C) as follows:
Note
1
NI calibrates the excitation voltage by using a 120
the SCXI-1320 terminal block. The excitation voltage values are measured at the output screw terminals of the SCXI-1320
terminal block. Because of the voltage drop in various portions of the circuit, the actual excitation voltage might vary slightly
with the resistance of the cable and of the load.
2
Located on the SCXI-1320, SCXI-1328, and SCXI-1321 terminal blocks.
3
Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature
sensor and any screw terminal.
© National Instruments Corporation
Drift ........................................................ 40 ppm/°C
Lead resistance effect............................. Negligible (4-wire measurement)
Resistance range..................................... 10 kΩ, maximum
Bridge types ........................................... Quarter-, half-, and full-bridge
Bridge completion.................................. Two 4.5 kΩ ±0.05% ratio
1
Excitation voltage
................................. 3.333 V ±0.04% or 10 V ±0.2%
Resistance range..................................... 120 Ω, minimum at 3.333 V
Half-bridge voltage ................................ V
2
SCXI-1320 and SCXI-1321
Accuracy ......................................... 1.0 °C over 0 to 55 °C
Output ............................................. 10 mV/°C
SCXI-1328
3
Accuracy
....................................... 0.35 ° from 15 to 35 °C
Output ............................................. 1.91 to 0.58 V from 0 to 55 °C
Output at 25 °C ............................... 1.25 V
Ω
load resistor that is connected to the excitation voltage output through
tolerance resistors
800 Ω, minimum at 10 V
EXT
0.65 ° from 0 to 15 ° and
35 to 55 °C
T = T
– 273.15
K
A-3
Appendix A
Specifications
/2 ±0.04%
SCXI-1121 User Manual
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