National Instruments TB-9212 Manual

CALIBRATION PROCEDURE
TB-9212
This document contains the verification procedure for the TB-9212 with screw terminal and
TB-9212 with mini-TC. In this document, TB-9212 with screw terminal and TB-9212 with
mini-TC are inclusively referred to as TB-9212. For more information about calibration
solutions, visit ni.com/calibration.
Note Refer to the NI 9212 Calibration Procedure on ni.com/manuals for
instructions on calibrating the NI 9212 module.
Contents
Software.................................................................................................................................... 2
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Building the Barrier Strip Assembly ................................................................................ 4
Test Conditions......................................................................................................................... 5
Initial Setup............................................................................................................................... 5
Verification ............................................................................................................................... 6
Terminal Block CJC Verification..................................................................................... 6
Where to Go for Support .......................................................................................................... 9

2|ni.com |TB-9212 Calibration Procedure
Software
Calibrating the TB-9212 requires the installation of NI-DAQmx 15.1 or later on the calibration
system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports
LabVIEW, LabWindows™/CVI™, ANSI C, and .NET. When you install NI-DAQmx, you only
need to install support for the application software that you intend to use.
Documentation
Consult the following documents for information about the TB-9212, NI-DAQmx, and your
application software. All documents are available on ni.com and help files install with the
software.
NI cDAQ-9174/9178 Quick Start
NI-DAQmx installation and hardware setup
NI 9212 Getting Started Guide
NI 9212 with TB-9212 specific information
NI 9212 Datasheet
NI 9212 with TB-9212 specifications and calibration interval
NI-DAQmx Readme
Operating system and application software support in NI-DAQmx
LabVIEW Help
LabVIEW programming concepts and reference information about NI-DAQmx
VIs and functions
NI-DAQmx C Reference Help
Reference information for NI-DAQmx C functions and NI-DAQmx C properties
NI-DAQmx .NET Help Support for Visual Studio
Reference information for NI-DAQmx .NET methods and NI-DAQmx .NET
properties, key concepts, and a C enum to .NET enum mapping table

TB-9212 Calibration Procedure |© National Instruments |3
Test Equipment
Table 1 lists the equipment recommended for the performance verification procedure. If the
recommended equipment is not available, select a substitute using the requirements listed in
Table 1.
Table 1. Recommended Equipment
Equipment
Recommended
Model Requirements
Thermocouple Calibrator Ectron 1140A A high-precision
thermocouple source with an
accuracy of ≤0.11 °C and an
output impedance of ≤10 Ω.
NI 9212 —An NI 9212 module that is
verified to be within product
specifications.
Chassis cDAQ-9178 —
Barrier Strip
Assembly
Thermocouple
Wire
TT-E-24-SLE-100 E-type SLE 24 AWG, 20 m to
30 m
Mini
Thermocouple
Connector
Omega
SMPW-E-M
E-type, must fit the output
terminal of the thermocouple
calibrator
Thermocouple
Barrier Strips
Omega BS16A 8 channels
Thermocouple
Barrier Strip
Jackets (x8)
Omega BSJ-E E-type, 8 channels
Thermocouple
Spade Lugs (x32)
Omega SLCH-20 16 lugs of chromel to match
the E-type wires
Omega SLCO-20 16 lugs of constantan to match
the E-type wires
Spade-Lug
Crimping Tool
Omega
CRIMPING
TOOL-P
Must effectively crimp the
spade lugs with the 24 AWG
wire.

4|ni.com |TB-9212 Calibration Procedure
Building the Barrier Strip Assembly
Complete the following steps to build the barrier strip assembly.
1. Build the barrier strip according to Figure 1.
Note Spade-lug colors in Figure 1 are for illustration purposes only and are used to
easily differentiate chromel and constantan spade lugs.
Figure 1. Building the Barrier Strip Assembly
2. Place the barrier strip section in any manner of enlosed setup, or controlled environment,
to reduce the affect of air currents and rapid temperature transients.
1 Use a single thermocouple wire, spade lugs, spade-lug crimping tool, and mini thermocouple connector to
make a wire assembly. Crimp the chromel spade lugs to the chromel wire to create 8 positive spade lugs.
Crimp the constantan spade lugs to the constantan wire to create 8 negative spade lugs.
2 Use the thermocouple wire, spade lugs, and spade-lug crimping tool to make 8 wires with bare leads on
one end and the spade lugs on the other end. Crimp the chromel spade lug to the chromel wire and the
constantan spade lug to the constantan wire.
3 Assemble the barrier strips and barrier strip jackets as indicated by the manufacturer.
4a (TB-9212 with screw terminal) Connect the wire assembly with the mini thermocouple connector and
8 wires to the barrier strip.
4b (TB-9212 with mini-TC) Connect the wire assembly with the mini thermocouple connector and 8 wires to
the barrier strip.
E0–
E0+
E1–
E1+
E2–
E2+
E5–
E5+
E6–
E6+
E7–
E7+
...
...
...
...
–+
4b4a
...
...
... ...
– +
– +
– +–+
– + –+ –+
+
+–
–
Ex–
Ex+
Ex–
Ex+
123
E0– E0+E1– E1+
E6– E6+
...
E7 – E7+
– +

TB-9212 Calibration Procedure |© National Instruments |5
Test Conditions
The following setup and environmental conditions are required to ensure the TB-9212 meets
published specifications.
• Keep connections to the TB-9212 as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
• Verify that all connections to the TB-9212 are secure.
• Use thermocouple wire for all cable connections to the TB-9212.
• Maintain an ambient temperature of 23 °C ± 5 °C. The TB-9212 temperature will be greater
than the ambient temperature.
• Keep relative humidity below 80%.
• Allow a warm-up time of at least 15 minutes to ensure that the NI 9212 measurement
circuitry is at a stable operating temperature.
Initial Setup
Refer to the NI cDAQ-9174/9178 Quick Start for information about how to install the software
and hardware and how to configure the device in Measurement & Automation Explorer (MAX).
Complete the following steps to set up the TB-9212.
1. Install NI-DAQmx.
Note Ensure that you install NI-DAQmx 15.1 or later. Calibrating the TB-9212
using NI-DAQmx 14.5 or earlier may result in inaccurate readings.
2. Make sure the cDAQ-9178 power source is not connected.
3. Connect the cDAQ-9178 to the system safety ground.
a. Attach a ring lug to a 14 AWG (1.6 mm) wire.
b. Connect the ring lug to the ground terminal on the side of the cDAQ-9178 using the
ground screw.
c. Attach the other end of the wire to the system safety ground.
4. Install the NI 9212 in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the
cDAQ-9178 chassis empty.
5. Connect the cDAQ-9178 chassis to your host computer.
6. Connect the power source to the cDAQ-9178 chassis.
7. Launch Measurement & Automation Explorer (MAX).
8. Right-click the device name and select Self-Test to ensure that the module is working
properly.

6|ni.com |TB-9212 Calibration Procedure
Verification
The following performance verification procedure describes the sequence of operation and
provides test points required to verify the TB-9212. The verification procedure assumes that
adequate traceable uncertainties are available for the calibration references.
Terminal Block CJC Verification
Complete the following procedure to determine the As-Found status of the TB-9212.
1. If you are using a TB-9212 with screw terminal, loosen the captive screws and remove the
top cover. If you are using a TB-9212 with mini-TC, you do not need to remove the top
cover.
2. Connect the thermocouple calibrator to the TB-9212 using the barrier strip assembly
created in the Building the Barrier Strip Assembly section. Refer to Figure 2 for a
connection diagram.
Figure 2. TB-9212 Verification Connections
3. If you are using a TB-9212 with screw terminal, reinstall the top cover.
4. Connect the TB-9212 to the NI 9212.
5. Power on the thermocouple calibrator and set the thermocouple type to E-type.
6. Wait 15 minutes or the warm-up time required by the thermocouple calibrator, whichever
is longer.
.
.
.
NI TB-9212
Barrier
Strip
E0+
E0–
E1+
E6–
E7+
E7–
E1–
E6+
.
.
.
.
.
.
TC0+
TC0–
+
–
+
–
TC1+
TC6–
TC7+
TC7–
TC1–
TC6+
.
.
.
Mini TC
Connector
TC
Calibrator
Barrier Strip Assembly

TB-9212 Calibration Procedure |© National Instruments |7
7. Acquire and average a CJCtemp xvalue.
a. Create and configure an AI Temp Built-in Sensor task for CJC channel _cjtempxon
the NI 9212 according to Table 2.
b. Configure the AI Temp Built-in Sensor task for CJC channel _cjtempxaccording to
Table 3.
c. Start the task.
d. Average the readings and record the value as CJCtemp x.
e. Clear the task.
8. Set the thermocouple calibrator output to CJCtemp0 to obtain the readings for the first four
physical channels, ai0:3. This ensures that during the thermocouple measurements, the
input channel measures very close to 0 V, which eliminates gain errors in the NI 9212.
9. Acquire and average samples.
a. Create and configure an AI temperature thermocouple channel for the NI 9212
according to Table 4.
b. Configure the AI temperature thermocouple channel timing according to Table 5.
c. Start the task.
Table 2. NI 9212 CJC Channel Configuration
Physical Channels Timing Mode
_cjtemp0:1 High Resolution
Table 3. NI 9212 CJC Channel Timing Configuration
Sample Mode Samples Per Channel Rate (S/s) Timeout (s)
Finite 20 1.8 30
Table 4. NI 9212 Thermocouple Channel Configuration
CJC
Channel
Physical
Channels
Minimum
Value
Maximum
Value Unit
Thermocouple
Type
CJCtemp0 ai0:3 0 100 °C E
CJCtemp1 ai4:7 0 100 °C E
Table 5. NI 9212 Thermocouple Channel Timing Configuration
Timing
Mode
Sample
Mode
Samples Per
Channel Rate (S/s) Timeout (s)
High Resolution Finite 20 1.8 30

8|ni.com |TB-9212 Calibration Procedure
Notes Make sure the thermocouple calibrator and NI 9212 are completely settled
at the desired temperature setting before acquiring data.
Wait at least 300 ms for the Ectron 1140A to settle before acquiring data with the
NI 9212.
Wait at least 1 second to compensate for the open thermocouple settling time of the
NI 9212.
d. Average the readings for each channel. Record the average of the readings for each as
Tempaixwhere xis the channel number.
e. Clear the task.
10. Set the thermocouple calibrator output to CJCtemp1 to obtain the readings for the next four
physical channels, ai4:7. This ensures that during the thermocouple measurements, the
input channel measures very close to 0 V, which eliminates gain errors in the NI 9212.
11. Repeat step 9.
12. Perform the following calculation using the recorded Tempaixand CJCtemp xvalues.
TempErrorCh0:3 = Tempai0:3 - CJCtemp0
TempErrorCh4:7 = Tempai4:7 - CJCtemp1
13. Compare the calculation result for each channel to the Upper Limit and Lower Limit values
in Table 6.
14. Remove the TB-9212 from the NI 9212.
15. Disconnect the barrier strip assembly from the TB-9212.
Note The test limits listed in Table 6 are based upon the 374389A-01 edition of the
NI 9212 with NI TB-9212 Datasheet. Refer to the most recent NI 9212 with
NI TB-9212 Datasheet online at ni.com/manuals.
If the verification procedure determines that the TB-9212 is outside of the limits, refer to Where
to Go for Support for assistance in returning the device to NI.
Table 6. TB-9212 Verification Test Limits
Connector
Timing
Mode
Test Point
Value (°C) Error
1-Year Limits (°C)
Lower
Limit
Upper
Limit
TB-9212
with Screw
Terminal High
Resolution CJCtempxTempErrorChx
-0.44 0.44
TB-9212
with
Mini-TC
-1.1 1.1

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374386B-01 Jan18
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