Measurement WaveBook User Manual
USB-TC
User's Guide
Document Revision 9
January 2014
© Copyright 2014
Thermocouple Measurement
HM USB-TC.docx
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2
Table of Contents
Preface
About this User’s Guide ....................................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the USB-TC ....................................................................................................................... 6
Overview: USB-TC features............................................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Connecting a USB-TC to your computer is easy ................................................................................................ 7
Chapter 2
Installing the USB-TC ........................................................................................................................... 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Software ............................................................................................................................................................................ 8
Documentation .................................................................................................................................................................. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Configuring the hardware ................................................................................................................................... 9
Calibrating the hardware..................................................................................................................................... 9
Chapter 3
Sensor Connections ........................................................................................................................... 10
Screw terminal pinout ....................................................................................................................................... 10
Thermocouple input .........................................................................................................................................................10
CJC sensors ......................................................................................................................................................................10
Digital I/O ........................................................................................................................................................................11
Power output ....................................................................................................................................................................11
Ground ................................................................................................................................................................ .............11
Thermocouple connections ............................................................................................................................... 11
Wiring configuration ........................................................................................................................................................11
Digital I/O connections ..................................................................................................................................... 12
Chapter 4
Functional Details ............................................................................................................................... 13
Thermocouple measurements ........................................................................................................................... 13
Cold junction compensation (CJC) ..................................................................................................................................13
Data linearization .............................................................................................................................................................13
Open-thermocouple detection (OTD) ..............................................................................................................................13
USB connector .................................................................................................................................................. 14
LED .................................................................................................................................................................. 14
Power ................................................................................................................................................................ 14
Chapter 5
Specifications ...................................................................................................................................... 15
Analog input ..................................................................................................................................................... 15
Channel configurations ..................................................................................................................................... 15
Accuracy ........................................................................................................................................................... 16
Thermocouple measurement accuracy ............................................................................................................................. 16
Throughput rate ................................................................................................................................................ 16
Digital input/output........................................................................................................................................... 17
3
USB-TC User's Guide
Memory ............................................................................................................................................................ 17
Microcontroller ................................................................................................................................................. 17
USB +5V voltage ............................................................................................................................................. 17
Power ................................................................................................................................................................ 18
USB specifications ........................................................................................................................................... 18
Environmental .................................................................................................................................................. 18
Mechanical ....................................................................................................................................................... 18
Signal connector ............................................................................................................................................... 19
Declaration of Conformity .................................................................................................................. 20
4
Preface
About this User’s Guide
This user's guide describes the Measurement Computing USB-TC data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information related to the subject matter.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about USB-TC hardware is available on our website at www.mccdaq.com. You can also
contact Measurement Computing Corporation by phone, fax, or email with specific questions.
Knowledgebase: kb.mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
5
Chapter 1
Introducing the USB-TC
Overview: USB-TC features
The USB-TC is a USB 2.0 full-speed, thermocouple input module that is supported under popular Microsoft®
Windows® operating systems. The USB-TC is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-TC provides eight differential thermocouple input channels. Eight independent, TTL-compatible
digital I/O channels are provided to monitor TTL-level inputs, communicate with external devices, and to
generate alarms. The digital I/O channels are software programmable for input or output.
With the USB-TC, you can take measurements from type J, K, R, S, T, N, E, and B thermocouples.
The USB-TC provides two integrated cold junction compensation (CJC) sensors for thermocouple
measurements.
An open thermocouple detection feature lets you detect a broken thermocouple. An on-board microprocessor
automatically linearizes the measurement data.
The USB-TC is a standalone plug-and-play module which draws power from the USB cable. No external power
supply is required. All configurable options are software programmable.
The USB-TC is fully software calibrated.
Functional block diagram
USB-TC functions are illustrated in the block diagram shown here.
Figure 1. Functional block diagram
6
USB-TC User's Guide Introducing the USB-TC
Connecting a USB-TC to your computer is easy
Installing a data acquisition device has never been easier.
The USB-TC relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class drivers
ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft HID
because it is a standard, and its performance delivers full control and maximizes data transfer rates for your
USB-TC. No third-party device driver is required.
The USB-TC is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to
configure.
You can connect the USB-TC before or after you install the software, and without powering down your
computer first. When you connect an HID to your system, your computer automatically detects it and
configures the necessary software. You can connect and power multiple HID peripherals to your system
using a USB hub.
You can connect your system to various devices using a standard four-wire cable. The USB connector
replaces the serial and parallel port connectors with one standardized plug and port combination.
You do not need a separate power supply module. The USB automatically delivers the electrical power
required by each peripheral connected to your system.
Data can flow two ways between a computer and peripheral over USB connections.
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