National Instruments USB-TC01 Bedienungsanleitung

National Instruments USB-TC01 Manual

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USER GUIDE

NI USB-TC01

Single-Channel Thermocouple Input Module

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ni.com/manuals

The National Instruments USB-TC01 data acquisition (DAQ) device provides a Full-Speed

USB interface for a single thermocouple channel. This user guide describes how to use the

device.

For specifications, refer to the NI USB-TC01 Device Specifications document available at

ni.com/manuals.

Figure 1. NI USB-TC01 Device

Safety Guidelines

The following section contains important safety information that you must follow when

installing and using the NI USB-TC01.

Caution Operate the NI USB-TC01 only as described in these operating

instructions. Misuse of the device can result in a hazard. You can compromise the

safety protection built into the device if the device is damaged in any way. If the

device is damaged, contact National Instruments for repair.

Caution Do not substitute parts or modify the device except as described in this

user guide. Use the device only with the accessories specified in the installation

instructions.

Caution Do not operate the device in an explosive atmosphere or where there may

be flammable gases or fumes. If you must operate the device in such an

environment, it must be in a suitably rated enclosure.

If you need to clean the device, use a dry cloth. Make sure that the device is completely dry

and free from contaminants before returning it to service.

Operate the device only at or below Pollution Degree 2. Pollution is foreign matter in a solid,

liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following

is a description of pollution degrees:

• Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The

pollution has no influence.

• Pollution Degree 2 means that only nonconductive pollution occurs in most cases.

Occasionally, however, a temporary conductivity caused by condensation must be

expected.

• Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive

pollution occurs that becomes conductive due to condensation.

You must insulate signal connections for the maximum voltage for which the device is rated.

Do not exceed the maximum ratings for the device. Do not install wiring while the device is

live with electrical signals.

Operate the device at or below the Measurement Category I1. Measurement circuits are

subjected to working voltages2 and transient stresses (overvoltage) from the circuit to which

they are connected during measurement or test. Measurement categories establish standard

impulse withstand voltage levels that commonly occur in electrical distribution systems. The

following is a description of measurement categories:

• Measurement Category I is for measurements performed on circuits not directly

connected to the electrical distribution system referred to as MAINS3 voltage. This

category is for measurements of voltages from specially protected secondary circuits.

1Measurement Category is defined in electrical safety standard IEC 61010-1. Measurement

Category is also referred to as Installation Category.

2Working voltage is the highest rms value of an AC or DC voltage that can occur across any

particular insulation.

3MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably

rated measuring circuits may be connected to the MAINS for measuring purposes.

2| ni.com | NI USB-TC01 User Guide

Such voltage measurements include signal levels, special equipment, limited-energy parts

of equipment, circuits powered by regulated low-voltage sources, and electronics.

• Measurement Category II is for measurements performed on circuits directly connected

to the electrical distribution system. This category refers to local-level electrical

distribution, such as that provided by a standard wall outlet (for example, 115 V for U.S.

or 230 V for Europe). Examples of Measurement Category II are measurements

performed on household appliances, portable tools, and similar E Series devices.

• Measurement Category III is for measurements performed in the building installation at

the distribution level. This category refers to measurements on hard-wired equipment

such as equipment in fixed installations, distribution boards, and circuit breakers. Other

examples are wiring, including cables, bus-bars, junction boxes, switches, socket-outlets

in the fixed installation, and stationary motors with permanent connections to fixed

installations.

• Measurement Category IV is for measurements performed at the primary electrical

supply installation (<1,000 V). Examples include electricity meters and measurements on

primary overcurrent protection devices and on ripple control units.

Installing the NI USB-TC01

Software support for Windows 7/Vista/XP is provided by the device. No separate driver

installation is required for operation.

Figure 2. NI USB-TC01 Components

1. USB Cable

2. NI USB-TC01 Device

3. Thermocouple Input

4. Mini Thermocouple Connector

Complete the following steps to set up the NI USB-TC01:

1. Plug the thermocouple into the thermocouple input on the NI USB-TC01 device. Refer to

the Thermocouple Input section for more information.

2. Connect the NI USB-TC01 USB cable into an available USB port on the computer. On

first connection to the computer, it may take a few seconds for the operating system to

detect and configure the NI USB-TC01 device.

NI USB-TC01 User Guide | © National Instruments | 3

Once the device has been detected, the NI USB-TC01 launch screen will open, as shown in

Figure 3, or a Windows Autoplay dialog will appear allowing you to select

TC01Launcher.exe to run the software.

Note You must connect the NI USB-TC01 to the computer for the launch screen to

open. If the NI USB-TC01 is connected to the computer and the launch screen does

not appear, refer to the NI USB-TC01 support page. The support page is accessible

by going to ni.com/info and entering Info Code USBTC01, or by clicking the

Device Support link on the NI USB-TC01 launch screen.

Note If Autoplay does not start, you can manually run the software by locating the

NI USB-TC01 under My Computer and double-clicking TC01Launcher.exe.

Figure 3. NI USB-TC01 Launch Screen

Through the NI USB-TC01 launch screen, you can graph and log data with the Temperature

Logger, customize the Temperature Logger source code in LabVIEW, and explore other ways

to do more with your NI USB-TC01.

Note When the Temperature Logger or another application accesses the device, the

Current Reading on the NI USB-TC01 launch screen is blocked and does not

update.

LED Indicator

The green LED on the NI USB-TC01 indicates the device status. When the LED is

illuminated, the device is powered and ready for operation. If the LED is not illuminated, the

device is not powered or did not initialize.

4| ni.com | NI USB-TC01 User Guide

Taking Measurements with Software

Logging Temperature

To log temperature data, complete the following steps:

1. From the NI USB-TC01 launch screen, click Temperature Logger.

2. In the NI USB-TC01 Temperature Logger window that opens, select the Thermocouple

Type and Temperature Units.

3. To capture (log) the temperature readings, select Log Data.

4. Click Start. The NI USB-TC01 acquires and graphs the temperature until you click Stop.

5. Click View Log to open the log file.

Downloading Additional Applications

Additional ready-to-run applications that provide added functionality for your NI USB-TC01

are available as free downloads. You can access these applications by selecting Do More with

your NI USB-TC01 from the NI USB-TC01 launch screen.

Creating Custom Software

In addition to taking measurements with the NI USB-TC01 launch screen, you can also build

custom software for your NI USB-TC01 with LabVIEW and NI-DAQmx driver software.

LabVIEW uses graphical icons and wires that resemble a flowchart, so you can graphically

wire together function blocks to create your own applications for logging data, alarming,

triggering, reporting, and performing real-time data analysis. To learn more, select Do More

with your NI USB-TC01 from the NI USB-TC01 launch screen.

Connecting Input Signals

The NI USB-TC01 provides connection for a single thermocouple. Supported thermocouple

types are J, K, R, S, T, N, E, and B.

The NI USB-TC01 has a two-prong uncompensated thermocouple input that accepts a

standard two-prong male mini thermocouple connector.

Figure 4. NI USB-TC01 Terminal Assignments

TC+TC−

Connect the positive lead of the thermocouple connector to the TC+ terminal, and the negative

lead of the thermocouple connector to the TC- terminal.

NI USB-TC01 User Guide | © National Instruments | 5

If you are unsure which thermocouple lead is positive and which is negative, refer to the

thermocouple documentation or the thermocouple wire spool.

Figure 5. Connecting a Thermocouple Input Signal to the NI USB-TC01

Thermocouple

TC–

TC+

USB-TC01

For best results, NI recommends using insulated or ungrounded thermocouples when possible.

If you need to increase the length of your thermocouple, use the same type of thermocouple

wires to minimize the error introduced by thermal EMFs.

Temperature measurement errors depend in part on the thermocouple type, the temperature

being measured, the accuracy of the thermocouple, and the cold-junction temperature. Error

graphs for each thermocouple type connected to the NI USB-TC01 are provided in the

NI USB-TC01 Device Specifications document, available at ni.com/manuals.

NI USB-TC01 Circuitry

The NI USB-TC01 device’s thermocouple channel passes through a differential filter and is

sampled by a 20-bit analog-to-digital converter (ADC), as shown in the following figure.

Figure 6. NI USB-TC01 Input Circuitry

3.3 V

10 MΩ

Isolated

GND

Low pass filter

and

protection

Isolated

ADC

TC+

TC−

10 MΩ

Thermocouple Measurement Accuracy

Temperature measurement errors depend in part on the thermocouple type, the temperature

being measured, the accuracy of the thermocouple, and the cold-junction temperature sensing

accuracy.

6| ni.com | NI USB-TC01 User Guide

Thermocouple Input

The NI USB-TC01 supports the J, K, R, S, T, N, E, and B thermocouple types. The

thermocouple input supports the standard mini thermocouple connector.

Figure 7. Mini Thermocouple Connector

If your thermocouple has bare wire leads, you can purchase a screw terminal mini

thermocouple connector to use with the NI USB-TC01. For the best accuracy, the mini

thermocouple connector type and thermocouple type should match.

Open Thermocouple Detection (OTD)

The NI USB-TC01 is equipped with open thermocouple detection. With OTD, any open-

circuit condition at the thermocouple sensor is detected by the software. An open channel is

detected by driving the input voltage to a positive value outside the range of the thermocouple

output.

If an open thermocouple is detected, the NI USB-TC01 software displays a message and lists

the internal CJC temperature, as shown in the following figure.

NI USB-TC01 User Guide | © National Instruments | 7

Figure 8. NI USB-TC01 Software Open Thermocouple Message

Note During an open thermocouple condition, some invalid values may be

returned before the open thermocouple is reported.

Cold-Junction Temperature Measurement

Accuracy

Heat from other nearby heat sources can cause errors in thermocouple measurements by

heating up the terminals so that they are at a different temperature than the cold-junction

compensation (CJC) sensor used to measure the cold junction.

Minimizing Thermal Gradients

Thermocouple wire can be a significant source of thermal gradients if it conducts heat or cold

directly to terminal junctions. To minimize these errors, use the following guidelines:

• Use small-gauge thermocouple wire. Smaller wire transfers less heat to or from the

measuring junction.

• Avoid running thermocouple wires near hot or cold objects.

• If you connect any extension wires to thermocouple wires, use wires made of the same

conductive material.

8| ni.com | NI USB-TC01 User Guide

Where to Go from Here

Technical Support on the Web

The NI USB-TC01 online support page contains links to the most recent product

documentation, drivers and updates, KnowledgeBase documents, tutorials, and example code.

The NI USB-TC01 support page is accessible from the NI USB-TC01 launch screen by

selecting the Device Support link or from ni.com/info by entering Info Code USBTC01.

Training Courses

If you need more help getting started developing an application with NI products, NI offers

training courses. To enroll in a course or obtain a detailed course outline, refer to ni.com/

training.

Worldwide Support and Services

The National Instruments 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 National Instruments 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.

National Instruments corporate headquarters is located at 11500 North Mopac Expressway,

Austin, Texas, 78759-3504. National Instruments 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.

NI USB-TC01 User Guide | © National Instruments | 9

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