National Instruments Thermometer SCC TC01 User Manual

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. The thermocouple inputs are filtered and passed into a  
differential amplifier with a gain of 100. The output of the amplifier passes  
through a dual-pole 2 Hz filter. Each module contains thermistor circuitry,  
powered by a 2.5 V reference, to compensate for cold-junction effects.  
Each module also can detect open thermocouple circuits.  
Alternatively, you can connect voltage signals up to 100 mV to the screw  
terminals of the SCC-TC02 and use it as a low-bandwidth millivolt-input  
module.  
Conventions  
The following conventions are used in this guide:  
<>  
Angle brackets that contain numbers separated by an ellipsis represent  
a range of values associated with a bit or signal name—for example,  
ai<0..7>.  
»
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.  
 
Numbers 1 and 2 Phillips screwdrivers  
Wire insulation strippers  
NI-DAQ (current version) for Windows 2000/NT/XP  
Note Software scaling of measurements is not supported on the Macintosh operating  
system. Refer to the Converting Voltage Measurements to Temperature Measurements  
section for more information about measurement scaling.  
Unpacking the Module  
SCC modules are shipped in antistatic envelopes to prevent electrostatic  
damage (ESD) to the modules. ESD can damage several components on  
these products.  
Caution Never touch the exposed pins of connectors.  
To avoid damage from ESD when you handle the module, take the  
following precautions:  
Ground yourself by using a grounding strap or by touching a grounded  
object.  
Touch the antistatic envelope to a metal part of the computer chassis  
before removing the module from the envelope.  
Remove the module from the envelope and inspect the module for loose  
components or any sign of damage. Notify NI if the module appears  
damaged in any way. Do not install a damaged module.  
Store the module in the antistatic envelope when it is not in use.  
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.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
A blue stripe on the label identifies the SCC-TC0X as an analog input  
module. The label also displays the icon shown in Figure 1.  
TC  
Figure 1. SCC-TC0X Icon  
You can plug the SCC-TC0X into any analog input socket on the SC-2345.  
The socket you select determines which E 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.  
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  
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 User Manual for more  
information on configuring, connecting and installing SCC modules  
Note SCC-TC0X dual-stage configuration is only available in NI-DAQ 7.1 or later.  
Connecting the Input Signals  
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.  
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The SCC-TC02 has a fixed screw-terminal receptacle and a removable  
screw-terminal block, as shown in Figure 2.  
1
3
2
1
2
1
SCC Screw-Terminal Receptacle  
2
Removable Screw-Terminal Block  
Figure 2. SCC-TC02 Two-Part Screw-Terminal System  
After you install the SCC-TC02, attach the input signals to the screw  
terminals of the module.  
1. Remove power from the signal lines.  
2. Strip 7 mm (0.28 in.) of insulation from the ends of the signal wires.  
3. Insert the wires into the screw terminals.  
4. Tighten the screws to 0.5 to 0.6 N m (4.4 to 5.3 lb in.) of torque.  
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.1  
The GND terminal connects to AIGND on the E Series DAQ device.  
The SCC-TC0X has a 10 Mbias 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.  
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 ni.com/  
support.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
 
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.  
E Series  
SCC-TC0X  
DAQ Device  
Ref 5 V  
10 MΩ  
Thermocouple  
Source  
10 kΩ  
+
2-Pole Filter/  
Buffer Stage  
TC+  
ACH(X )  
10 kΩ  
TC-  
Offset  
Calibrator  
10 MΩ  
GND  
(SCC-TC02  
only)  
Ref 5 V  
AISENSE  
AIGND  
4.75 kΩ  
1%  
5 kΩ  
LM 4040  
2.5 V  
0.1%  
0.1%  
+
0.1 µF  
-to  
ACH(X+8)  
+
5 kΩ  
10 µF  
16 V  
0.1 µF  
at 25o C  
2.5 kΩ  
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.  
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You can use the following formulas to convert the cold-junction sensor  
voltage to cold-junction temperature:  
TC) = TK 273.15  
where TK is the temperature in kelvin.  
1
TK = --------------------------------------------------------------  
[a + b(lnRT) + c(lnRT)3]  
where  
a = 1.295361 × 10–3  
b = 2.343159 × 10–4  
c = 1.018703 × 10–7  
RT is the resistance of the thermistor in ohms.  
VTEMPOUT  
--------------------------------------  
RT = 5, 000  
2.5 VTEMPOUT  
where VTEMPOUT is the output voltage of the cold-junction sensor.  
[TC)]9  
TF) = ----------------------- + 32  
5
where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit  
Note VTEMPOUT varies from 1.91 V (at 0 °C) to 0.58 V (at 55 °C). For best resolution, use  
the maximum gain for this range on the analog input channel.  
For the cold-junction sensor measurement accuracy, refer to the  
Specifications section.  
Uncompensated Connectors and Accuracy  
If you are using an SCC-TC02 with an uncompensated SCC panelette,  
temperature gradients between the module and the junctions on the  
panelette affect the accuracy of your measurements.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
Detecting Open Thermocouples  
The SCC-TC0X contains a 10 Mpull-up resistor that connects to  
+5 V to detect open thermocouples. To determine if you have an open  
thermocouple, check whether the corresponding E Series DAQ device  
channel is saturated. The pull-up and bias resistors saturate the channel by  
applying +2.5 V at the input of an open channel. This results in saturation  
to either the positive or negative rails of the E Series DAQ device ( 10 V).  
Errors Due to Open-Thermocouple Detection Circuitry  
The open-thermocouple detection circuitry can cause measurement errors.  
These errors are the results of common-mode voltage at the input of the  
SCC and current leakage into the signal leads. The 10 Mbias resistor in  
the SCC-TC0X causes this error to be negligible. With the 10 Mbias  
resistor connected to ground and the 10 Mpull-up resistor connected to  
+5 VDC, a current leakage of approximately 0.25 µA (5 V/20 M) flows  
into the unbroken floating thermocouple. Long thermocouple leads result  
in larger voltage drops due to lead resistance.  
For example, if you have a 24 AWG J-type thermocouple that is 20 ft long,  
a voltage drop of approximately  
4 µV = (0.145 /ft + 0.658 /ft) × 20 ft × 0.25 µA  
can develop in the thermocouple, which corresponds to an error of 0.09 °C.  
With 10 Mpull-up and bias resistors, a common-mode voltage of  
+2.5 VDC develops if the thermocouple is floating. The common-mode  
rejection of the SCC-TC0X is sufficiently high, which results in the offset  
voltage being negligible in most applications.  
If your application demands extremely high accuracy, you can eliminate  
these errors by calibrating the system. Refer to the Calibrating System  
Offsets section for more information.  
Configuring the SCC System  
Measurement & Automation Explorer (MAX) Configuration  
Run MAX to configure the SCC system. Complete one of the following  
procedures depending on the version of NI-DAQ used in your application.  
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NI-DAQmx  
Complete the following steps to configure the SCC-TC module using  
NI-DAQmx.  
1. Open Measurement & Automation Explorer.  
2. Right-click Devices and Interfaces and select Create New.  
3. Under NI-DAQmx SCC Connector Block, select SC-2345. Click  
Finish.  
4. In the SCC Connector Block Configuration window, configure the  
SCC system as follows:  
a. Specify the SCC Carrier Type. The location of the SCC sockets  
change depending on the SCC carrier type.  
b. Select the DAQ Device that is connected to the SC-2345.  
c. Enter the SCC Connector Block ID. The default value is SCC1.  
d. In the J21 drop-down list next to Power, select the correct  
SC-2345 power configuration. Refer to the SC-2345 User Manual  
for information on power configurations.  
e. For each SCC module physically installed in the SC-2345, add a  
corresponding entry in the SC-2345 configuration window. To add  
the SCC, click the socket drop-down list and select the correct  
module. If the module name does not appear in the list, either the  
module is not allowed in that location or you do not have the  
current version of NI-DAQ. If you do not have the current version  
of NI-DAQ, download it from ni.com.  
f. Click OK after completing all SCC entries to complete the  
configuration process.  
5. Close MAX.  
Note Configuring the SCC system using MAX automatically sets the E Series DAQ  
device analog input mode to nonreferenced single-ended (NRSE).  
Traditional NI-DAQ  
Complete the following steps to configure the SCC-TC module using  
Traditional NI-DAQ.  
1. Open Measurement & Automation Explorer.  
2. Expand Devices and Interfaces.  
3. Expand Traditional NI-DAQ Devices.  
4. Right-click the E Series DAQ device connected to the SC-2345,  
and select Properties.  
5. Select the Accessory tab.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
6. Under Accessory:, select SC-2345.  
7. Click the Configure button. A new window appears listing the sockets  
(connector reference designators) of the SC-2345.  
8. Select the SC-2345 socket where you installed an SCC.  
9. Click Add and select the SCC you installed. If the module name does  
not appear in the list, either the module is not allowed in that location  
or you do not have the current version of NI-DAQ. If you do not have  
the current version of NI-DAQ, download it from ni.com.  
10. If you make a selection mistake, select the socket and click Remove.  
11. Repeat steps 8 and 9 for each newly installed SCC.  
12. Click OK after completing all SCC entries.  
13. Click OK to complete the configuration process and close MAX.  
Note Configuring the SCC system using MAX automatically sets the E Series DAQ  
device analog input mode to nonreferenced single-ended (NRSE).  
Virtual Channels, Physical Channels, and Tasks  
After you have installed and configured your SCC hardware, you can use  
software tools within MAX to further configure the module and take  
measurements.  
Creating an NI-DAQmx Task or Global Channel  
To create an NI-DAQmx task or global channel, complete the following  
steps:  
1. Open Measurement & Automation Explorer.  
2. Right-click Data Neighborhood and select Create New.  
3. Select NI-DAQmx Task or NI-DAQmx Global Channel and click  
Next.  
4. Select Analog Input, then select Temperature and then select  
Thermocouple.  
5. If you are creating a task, select the channels to add to the task. You can  
select blocks of channels by pressing the <Shift> key while making the  
selections, or select individual channels by pressing the <Ctrl> key  
while making the selections. If you are creating a channel, you can  
select only one channel. Click Next.  
6. Enter a name for the task or global channel and click Finish.  
7. In the Channel List box, select the channel(s) you want to configure.  
You can select blocks of channels by pressing the <Shift> key while  
making the selections, or select individual channels by pressing the  
<Ctrl> key while making the selections.  
SCC-TC Series Thermocouple Input Modules User Guide  
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8. Enter the specific values for your application in the Settings tab.  
Context help information for each setting is provided on the right side  
of the screen.  
9. Choose the type of thermocouple you have connected to your SCC  
module. For the CJC Source parameter, select Built-In.  
10. Click Test to test the channel. You should be able to view your  
measurement in the window that appears.  
You have finished configuring the NI-DAQmx task or global channel.  
Creating a Virtual Channel in Traditional NI-DAQ  
To create a Traditional NI-DAQ virtual channel, complete the following  
steps:  
1. Open Measurement & Automation Explorer.  
2. Right-click Data Neighborhood and select Create New.  
3. Select Traditional NI-DAQ Virtual Channel and click Finish.  
4. Click Next to select Analog Input as the type of channel to configure.  
5. From the drop-down list, select the appropriate Thermocouple type  
and click Next.  
6. Enter the rest of the values as they apply to your setup and click Next.  
7. On the next screen, specify information about the E Series DAQ device  
being used and the CJC source and click Finish.  
8. To test the channel, click Test.  
You have finished configuring the Traditional NI-DAQ virtual channel.  
Calibrating System Offsets  
To calibrate the offset voltage of the SCC-TC0X in the system using the  
E Series DAQ device, complete the following steps. The E Series DAQ  
device must be on for 30 minutes before you calibrate the offset voltage.  
1. Select the desired channel and gain on the E Series DAQ device.  
2. Short the inputs on the SCC-TC0X screw terminals or miniplug.  
3. While acquiring data on the selected channel, use a screwdriver to  
adjust the potentiometer protruding through the top of the module until  
you read 0 VDC.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
 
Calibrating the SCC-TC0X Using a Thermocouple  
Calibrator  
To calibrate the system using a thermocouple calibrator, complete the  
following steps:  
1. Make sure that the thermocouple connections at both the SCC and the  
thermocouple calibrator are at the same temperature.  
2. Connect the thermocouple calibrator to the SCC-TC0X. For best  
results, use thermocouple wire of the same length and type that you  
use in the thermocouple.  
3. Set the thermocouple calibrator to the required calibration  
temperature.  
4. Measure the calibrator voltage using the SCC-TC0X.  
5. Convert the measured calibrator voltage to a temperature measurement  
as described in the Converting Voltage Measurements to Temperature  
Measurements section.  
6. Adjust the potentiometer on the top of the SCC-TC0X so that the  
measured temperature is equal to the calibration temperature.  
Converting Voltage Measurements to Temperature  
Measurements  
Note NI-DAQ 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 Series DAQ devices. If so, you must convert voltage measurements to  
temperature measurements. To make this conversion, complete the  
following steps:  
1. Measure the thermocouple voltage.  
a. Read the thermocouple channel on the E Series DAQ device  
VESERIES [CH(X)].  
b. Calculate the thermocouple voltage by using the following  
formula:  
VESERIES  
VTC = ---------------------  
100  
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where  
VTC is thermocouple voltage.  
VESERIES is E Series DAQ device voltage.  
This step provides proper scaling for the thermocouple amplifier in the  
SCC-TC0X.  
2. Measure the reference-junction (cold-junction) temperature.  
a. Read the thermistor voltage [ACH(X+8)].  
b. Convert the thermistor voltage to cold-junction temperature using  
the formula in the Cold-Junction Sensor Output and Accuracy  
section.  
3. Calculate the cold-junction compensation voltage by converting the  
cold-junction temperature you got in step 2 to a thermocouple voltage.  
Use the polynomial expressions applicable to the type of thermocouple  
you are using.  
4. Apply the cold-junction compensation to the thermocouple reading  
by adding the cold-junction compensation voltage you got in step 3  
to VTC  
.
5. Calculate the thermocouple temperature by converting the voltage  
result you got in step 4 to a temperature. Use the polynomial  
expressions applicable to the type of thermocouple you are using.  
This calculation gives you a linearized temperature measurement.  
Note Polynomials come from NIST Monograph 175.  
Specifications  
These specifications are typical at 25 °C unless otherwise stated.  
Number of input channels...................... 1 DIFF  
Analog Input  
Input signals ........................................... Thermocouples of types B, E, J,  
K, N, R, S, and T  
Input signal range................................... 100 mV  
Input impedance..................................... 10 Mpowered on,  
10 kpowered off or overload  
Bandwidth.............................................. 2 Hz  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
     
Amplifier Characteristics  
Open thermocouple detection current.....250 nA max1  
(assuming floating thermocouple)  
Common-mode rejection ratio................110 dB min1  
Output range ........................................... 10 V max1  
Transfer Characteristics  
Gain ........................................................100  
Gain error................................................ 0.08% max1  
Gain stability........................................... 0.0005%/°C max2  
Offset error ............................................. 5 µV max (post calibration)1  
Offset stability ........................................ 0.6 µV/°C max2  
Nonlinearity............................................ 0.004% max1  
Recommended warm-up time.................5 minutes  
Measurement Accuracy 3  
Thermocouple  
Type  
Temperature  
Range (°C)  
Maximum  
Inaccuracy ( °C)  
Typical  
Inaccuracy ( °C)  
B
400 to 600  
600 to 1,800  
2.5  
2
0.31  
0.13  
E
–200 to –100  
–100 to 600  
600 to 1,000  
2
1
1.5  
1.76  
1
0.6  
J
–200 to –100  
–100 to 500  
500 to 1,100  
2
1
1.5  
1.6  
0.9  
0.72  
1
2
3
Temperature range is 23 °C 5 °C.  
Temperature range is 0 to 50 °C.  
Total system measurement error for operating temperature within 5 °C of calibration temperature. Includes  
PCI/AT-MIO-16XE-50 one-year accuracy specification of 0.01% 412 µV. SCC-TC01/02 accuracy specification of 0.08%  
5 µV, and reference junction measurement accuracy of 0.5 °C. Assumes averaging. Non-averaged, single-point reading has  
an additional uncertainty (up to 0.1 °C for J-type thermocouple).  
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Thermocouple  
Type  
Temperature  
Range (°C)  
Maximum  
Inaccuracy ( °C)  
Typical  
Inaccuracy ( °C)  
K
–200 to –100  
–100 to 600  
600 to 1,200  
2.5  
1.25  
2
1.25  
0.67  
0.45  
N
R
–200 to –100  
–100 to 1,300  
2.5  
2
2
0.7  
–50 to 0  
0 to 100  
100 to1,600  
3
2
1.75  
1.24  
0.82  
0.4  
S
T
–50 to 0  
0 to 1,400  
1,400 to 1,600  
3
2
2.5  
1.3  
1
1
–200 to –100  
–100 to 400  
2.5  
1
2
0.9  
Cold-Junction Sensor  
Cold-junction sensor accuracy............... 0.4 °C max from 15 to 35 °C,  
0.75 °C max from 0 to 15 °C  
and 35 to 55 °C  
Output..................................................... 1.91 V (0 °C) to 0.58 V (55 °C)  
Note The accuracy specification includes the combined effects of the temperature sensor  
accuracy and the temperature difference between the temperature sensor and any  
thermocouple connector. The temperature sensor accuracy includes component tolerances,  
temperature drifts, and self-heating effects. It does not include measurement device errors.  
Open Thermocouple Detection  
Pull-up resistor ....................................... 10 MΩ  
Bias resistor............................................ 10 MΩ  
Maximum field wire gauge.................... 16 AWG  
Power Requirement  
Analog power......................................... 60 mW max  
+15 V .............................................. 2 mA max  
–15 V............................................... 2 mA max  
Digital power (+5 V).............................. 0.0 mW  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
Physical  
TC01 dimensions....................................7.8 cm by 2.92 cm by 1.85 cm  
(3.1 in. by 1.15 in. by 0.73 in.)  
TC02 dimensions....................................8.89 cm by 2.92 cm by 1.85 cm  
(3.50 in. by 1.15 in. by 0.73 in.)  
I/O...........................................................One 20-pin right angle male  
connector, 3-pin screw terminal  
system (SCC-TC02);  
two-prong mini-connector  
(SCC-TC01)  
Screw terminal field-wiring  
gauge (SCC-TC02).................................28 to 16 AWG  
Maximum Working Voltage  
Maximum working voltage refers to the signal voltage plus the  
common-mode voltage.  
Each input must remain within 12 V of chassis ground.  
Installation Category I  
Environmental  
Operating temperature ............................0 to 50 °C  
Storage temperature................................–20 to 70 °C  
Humidity.................................................10 to 90% RH, noncondensing  
Maximum altitude...................................2,000 m  
Pollution Degree (indoor use only) ........2  
Safety  
The SCC-TC0X meets the requirements of the following standards  
for safety and electrical equipment for measurement, control, and  
laboratory use:  
IEC 61010-1, EN 61010-1  
UL 3111-1, UL 61010B-1  
CAN/CSA C22.2 No. 1010.1  
SCC-TC Series Thermocouple Input Modules User Guide  
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Note For UL and other safety certifications, refer to the product label, or visit  
ni.com/hardref.nsf, search by model number or product line, and click the  
appropriate link in the Certification column.  
Electromagnetic Compatibility  
Electrical emissions................................ EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Electrical immunity................................ Evaluated to EN 61326:1997/  
A2:2001, Table 1  
CE, C-Tick, and FCC Part 15 (Class A) Compliant  
Note For full EMC compliance, you must operate this device with shielded cabling.  
In addition, all covers and filler panels must be installed.  
CE Compliance  
The SCC-TC0X meets the essential requirements of applicable European  
Directives, as amended for CE marking, as follows:  
Low-Voltage Directive (safety) ............. 73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC) .................................... 89/336/EEC  
Note Refer to the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, visit  
ni.com/hardref.nsf, search by model number or product line, and click the  
appropriate link in the Certification column.  
© National Instruments Corporation  
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SCC-TC Series Thermocouple Input Modules User Guide  
 
I/O Connector Pin Assignments  
Figure 4 shows the I/O connector pins on the bottom of the module.  
19  
20  
17  
18  
15  
16  
13  
14  
11  
12  
9
7
8
5
6
3
4
1
2
10  
Figure 4. SCC Module Bottom View  
Table 1 lists the signal connection corresponding to each pin. ACH(X) and  
ACH(X+8) are the analog input signal channels of the E Series DAQ  
device. AIGND is the analog input ground signal and is the reference for  
ACH(X) and ACH(X+8). AGND is the reference for the 15 V supplies and  
REF5V. AIGND and AGND connect to the SC-2345 at the SCC-PWR  
connector.  
Table 1. SCC Module Pin Signal Connections for SCC-TC0X Modules  
Pin Number  
Signal  
ACH(X)  
1
2
3
4
ACH(X+8)  
5
6
AIGND  
7
8
9
10  
11  
12  
AGND  
REF5V  
SCC-TC Series Thermocouple Input Modules User Guide  
18  
ni.com  
 
   
Table 1. SCC Module Pin Signal Connections for SCC-TC0X Modules (Continued)  
Pin Number  
Signal  
+15 V  
–15 V  
13  
14  
15  
16  
17  
18  
19  
20  
© National Instruments Corporation  
19  
SCC-TC Series Thermocouple Input Modules User Guide  
 
National Instruments™, NI™, ni.com™, and NI-DAQ™ are trademarks of National Instruments  
Corporation. Product and company names mentioned herein are trademarks or trade names of their  
respective companies. For patents covering National Instruments products, refer to the appropriate  
location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.  
*323099B-01*  
323099B-01  
Sep03  
© 2002–2003 National Instruments Corp. All rights reserved.  
 

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