National Instruments TB-9212 Handbuch

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

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

374386B-01 Jan18

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on NI trademarks. Other product and company

names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the

appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at

ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your

NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy

and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE

ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The data

contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in

FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

Where to Go for Support

The NI website is your complete resource for technical support. At ni.com/support you have

access to everything from troubleshooting and application development self-help resources to

email and phone assistance from NI Application Engineers.

Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and

other services.

Visit ni.com/register to register your NI product. Product registration facilitates technical

support and ensures that you receive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European

Communities using the manufacturer’s declaration of conformity. This system affords the user

protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC

for your product by visiting ni.com/certification. If your product supports calibration,

you can obtain the calibration certificate for your product at ni.com/calibration.

NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,

78759-3504. NI also has offices located around the world. For telephone support in the United

States, create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964).

For telephone support outside the United States, visit the Worldwide Offices section of

ni.com/niglobal to access the branch office websites, which provide up-to-date contact

information, support phone numbers, email addresses, and current events.

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