USER GUIDE
SCC-TC Series Thermocouple
Input Modules
The SCC-TC Series thermocouple input modules, SCC-TC01 and
SCC-TC02, accept input signals from B-, E-, J-, K-, N-, R-, S-, and T-type
thermocouples. Each module contains thermistor circuitry powered by
2.5 V, to compensate for cold-junction effects and can detect open
thermocouple circuits. Each module has one thermocouple input channel,
which consists of a gain of 100 differential amplifier and a dual-pole 2 Hz
filter.
Note Alternatively, you can use the SCC-TC02 as a 2 Hz lowpass bandwidth ±100 mV
input module.
Conventions
The following conventions are used in this guide:
» The » symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this symbol is marked on
the product, refer to the Read Me First: Safety and Radio-Frequency
Interference document, shipped with the product, for precautions to take.
When symbol is marked on a product, it denotes a warning advising you to
take precautions to avoid electrical shock.
When symbol is marked on a product, it denotes a component that may be
hot. Touching this component may result in bodily injury.
bold Bold text denotes items that you must select in the software, such as menu
items and dialog box options. Bold text also denotes parameter names.
italic Italic text denotes variables, emphasis, a cross-reference, or an introduction
to a key concept. Italic text also denotes text that is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames, and extensions.
SC-2345 SC-2345 refers to both the SC-2345 connector block and the SC-2345
configurable connector.
SCC SCC refers to any SCC series signal conditioning module.
What You Need to Get Started
To set up and use the SCC-TC0X, you need the following items:
❑ Hardware
–SCC-68
or
– SC-2345/2350 with one of the following:
• SCC-PWR01
• SCC-PWR02 and the PS01 power supply
• SCC-PWR03 (requires a 7 to 42 VDC power supply,
not included)
– One or more SCC-0X
– 68-pin E/M Series DAQ device
– 68-pin cable
– Quick Reference Label
❑ Software
– The latest version of NI-DAQmx
SCC-TC Series Thermocouple Input Modules User Guide 2 ni.com
❑ Documentation
– One of the following:
• SC-2345/2350 User Manual
• SCC-68 User Guide
– SCC-TC Series Thermocouple Input Modules User Guide
– Read Me First: Safety and Radio-Frequency Interference
– SCC Quick Start Guide
❑ Tools
– 1/8 in. flathead screwdriver
– Numbers 1 and 2 Phillips screwdrivers
– Wire insulation strippers
You can download needed documents from
Note Software scaling of measurements is not supported on the Macintosh operating
system. Refer to the Scaling Voltage Measurements section for more information about
measurement scaling.
Device Specific Information
Note For general SCC module installation and signal connection information, and
information about the SC-2345 or SC-2350 carriers, refer to the SCC Quick Start Guide.
Installing the Module
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting/disconnecting any signal wires.
You can plug the SCC-TC0X into any analog input socket on the SCC
carrier. The socket you select determines which E/M Series DAQ device
channels receive the SCC-TC0X signals.
For single-stage input conditioning, plug the SCC-TC0X into any socket
J(X +1), where X is 0 to 7, and connect the input signals to the module as
described in the Connecting the Input Signals section.
ni.com/manuals.
If you use the SCC-TC0X in a dual-stage configuration, the SCC-TC0X
must be the first-stage module. Plug it into any socket J(X+9) and plug the
second-stage SCC into socket J(X+1), where X is 0 to 7. Connect the input
signals to SCC-TC0X as described in the Connecting the Input Signals
section. The SC-2345 connects the output signals of the first-stage SCC to
© National Instruments Corporation 3 SCC-TC Series Thermocouple Input Modules User Guide
the inputs of the second-stage SCC. An example of dual-stage conditioning
in an SCC-TC0X followed by an SCC-LP01 lowpass filter module.
Sockets J9 to J16 also are available for digital input/output (DIO)
conditioning or control. Refer to the SC-2345/2350 User Manual for more
information on configuring, connecting, and installing SCC modules
Note SCC-TC0X dual-stage configuration is only available in NI-DAQmx 7.1 or later.
Connecting the Input Signals
Note The signal names have changed. Refer to ni.com/info and enter rdtntg to
confirm the signal names.
The SCC-TC01 has a two-prong uncompensated thermocouple
miniconnector that accepts any miniature or subminiature two-prong
male thermocouple connector. The SCC-TC02 has a three-position
screw-terminal connector that accepts 28 to 16 AWG thermocouple wires.
The screw-terminal connector provides a ground connection for shielded
thermocouples. Otherwise, the two modules function identically.
To use an SCC-TC01, plug the male thermocouple connector into the
module.
The SCC-TC02 accepts up to three signals: TC+, TC–, and GND. TC+ is
the positive thermocouple lead and TC– is the negative thermocouple lead.
The GND terminal connects to AI GND on the E/M Series DAQ device.
The SCC-TC0X has a 10 MΩ bias resistor connected from the negative
thermocouple input to ground. This resistor allows the thermocouple to be
ground-referenced or floating without requiring external bias resistors
connected to ground.
The amplified thermocouple signal and cold-junction sensor signal
are measured by E/M 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 1 for SCC-TC0X signal connections.
1
For ANSI color-coded J-type thermocouples, the red wire is negative and the white wire is positive. Refer to the thermocouple
data sheet if possible. You can find information about other color-coding schemes in the NI KnowledgeBase at
support
.
ni.com/
1
SCC-TC Series Thermocouple Input Modules User Guide 4 ni.com
Thermocouple
Source
TC+
TC-
GND
(SCC-TC02
only)
SCC-TC0
Ref 5 V
10 MΩ
10 MΩ
Ref 5 V
4.75 kΩ
1%
X
10 kΩ
10 kΩ
+
–
2-Pole Filter/
Buffer Stage
Offset
Calibrator
E/M Series
DAQ Device
AI (X )
AI SENSE
AI GND
LM 4040
2.5 V
0.1%
0.1 μF
o
-t
For more information about how to configure the SCC-TC0X module using
NI-DAQmx, refer to the SCC Quick Start Guide.
Using the TC0X
Scaling Voltage Measurements
Note NI-DAQmx includes thermocouple and thermistor conversion utilities that
implement the conversions required in steps 3 and 5 of the following procedure. Refer to
your software documentation for more information on these utilities.
Your software environment may return only voltage measurements from
E/M Series DAQ devices. If so, you must convert voltage measurements to
5 kΩ
0.1%
+
5 kΩ
at 25
+
10 μF
o
C
16 V
–
0.1 μF
2.5 kΩ
Figure 1. SCC-TC0X Signal Connections
AI (
X
+8)
© National Instruments Corporation 5 SCC-TC Series Thermocouple Input Modules User Guide
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