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SCC-TC Series Thermocouple Input Modules User Guide 6 ni.com
The amplified thermocouple signal and cold-junction sensor signal
are measured by E Series DAQ device channel X and channel X+8
respectively, where X is 0 to 7 depending on where you plug the
SCC-TC0X. Refer to Figure 3 for SCC-TC0X signal connections.
Figure 3. SCC-TC0X Signal Connections
Cold-Junction Sensor Output and Accuracy
The cold-junction sensor voltage output varies from 1.91 to 0.58 V over a
0 to 55 °C temperature range.
Note NI-DAQ includes thermistor conversion utilities that implement the equations listed
below. Refer to your software documentation for more information on these utilities.
Thermocouple
Source
ACH(
X
)
ACH(
X
+8)
SCC-TC0
X
E Series
DAQ Device
+
–
4.75 kΩ
1%
5 kΩ
0.1%
10 kΩ
10 kΩ
2.5 kΩ
+
5 kΩ
at 25
o
C
10 MΩ
10 MΩ
10 µF
16 V
0.1 µF
0.1 µF
-t
o
Ref 5 V
Ref 5 V
LM 4040
2.5 V
0.1%
2-Pole Filter/
Buffer Stage
Offset
Calibrator
AISENSE
TC+
GND
(SCC-TC02
only)
TC-
AIGND
+
–