TBX-1328 Installation Guide
8
ni.com
Specifications
All specifications are typical at 25 °C unless otherwise specified.
Electrical
Compatible modules
SCXI-1120/D...................................8 input channels
SCXI-1121.......................................4 input channels,
4 excitation output channels
SCXI-1125.......................................8 input channels
SCXI-1126.......................................8 input channels
Cold-junction temperature-sensor circuitry
Sensor type ......................................Thermistor
Output range ....................................1.91 to 0.65 VDC from 0 to 50 °C
Accuracy
1
........................................±0.5 °C from 15 to 35 °C
±0.9 °C from 0 to 15 °C
and 35 to 50 °C
Repeatability....................................±0.2 °C from 15 to 35 °C
Coupling .................................................DC
2
Current-receiver resistors........................Resistors not included
Resistor sockets are provided
for each channel
Field-wiring connectors
Signal screw terminals.....................16 screw terminals (8 pairs)
Functional earth ground...................8 screw terminals
Terminal spacing .............................0.5 cm (0.2 in.)
center-to-center
Maximum wire gauge......................16 AWG
Strain relief ......................................none
Dimensions of front entrance .................1.2 by 7.3 cm
(0.47 by 2.87 in.)
1
This specification includes the accuracy of the temperature-sensor circuitry itself and the temperature difference between the
thermistor and any screw terminal. The temperature-sensor circuitry accuracy includes manufacturing tolerances in all
component values, effects caused by component-value temperature drift, voltage-divider loading, and thermistor self-heating.
2
In instrumentation terminology,
DC coupling
means that both DC and AC signals are passed.