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RedLab TC
User Manual
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Meilhaus Electronic RedLab TC User Manual

RedLab TC
USB-based 8-Channel Thermocouple Input
Module
User's Guide
Document Revision 1.4 E, January, 2008
Imprint
User’s Guide RedLab® Series
Document Revision 1.4 E Revision Date: January 2008
Meilhaus Electronic GmbH
Fischerstraße 2 D-82178 Puchheim near Munich, Germany http://www.meilhaus.de
© Copyright 2008 Meilhaus Electronic GmbH
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording, or otherwise without the prior written permission of Meilhaus Electronic GmbH.
Important note:
All the information included in this user’s gide were put together with utmost care and to best knowledge. However, mistakes may not have been erased completely.
For this reason, the firm Meilhaus Electronic GmbH feels obliged to point out that they cannot be take on neither any warranty (apart from the claims for warranty as agreed) nor legal responsibility or liability for consequences caused by incorrect instructions.
We would appreciate it if you inform us about any possible mistakes.
The trademark Personal Measurement Device, TracerDAQ, Universal Library, InstaCal, Harsh Environment Warranty, Measurement Computing Corporation, and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation.
Windows, Microsoft, and Visual Studio are either trademarks or registered trademarks of Microsoft Corporation.
LabVIEW is a trademark of National Instruments.
CompactFlash is a registered trademark of SanDisk Corporation.
XBee is a trademark of MaxStream, Inc.
All other trademarks are the property of their respective owners.
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Table of Contents
Preface
About this User’s Guide .......................................................................................................................6
What you will learn from this user’s guide.........................................................................................................6
Conventions in this user’s guide.........................................................................................................................6
Where to find more information.........................................................................................................................6
Chapter 1
Introducing the RedLab TC..................................................................................................................7
Overview: RedLab TC features..........................................................................................................................7
RedLab TC block diagram..................................................................................................................................8
Software features................................................................................................................................................8
Connecting a RedLab TC to your computer is easy ...........................................................................................9
Chapter 2
Installing the RedLab TC....................................................................................................................10
What comes with your RedLab TC shipment? .................................................................................................10
Hardware .........................................................................................................................................................................10
Additional documentation................................................................................................................................................10
Unpacking the RedLab TC...............................................................................................................................11
Installing the software ......................................................................................................................................11
Installing the RedLab TC..................................................................................................................................11
Configuring the RedLab TC .............................................................................................................................12
Calibrating the RedLab TC...............................................................................................................................12
Chapter 3
Sensor Connections ...........................................................................................................................13
Screw terminal pin out......................................................................................................................................13
Thermocouple input terminals (C0H/C0L to C7H/C7L) .................................................................................................14
Ground terminals (GND) .................................................................................................................................................14
Power terminals (+5V).....................................................................................................................................................14
Digital terminals (DIO0 to DIO7)....................................................................................................................................14
CJC sensors......................................................................................................................................................................14
Thermocouple connections...............................................................................................................................15
Wiring configuration........................................................................................................................................................15
Digital I/O connections.....................................................................................................................................16
Chapter 4
Functional Details ...............................................................................................................................17
Thermocouple measurements ...........................................................................................................................17
Cold junction compensation (CJC)..................................................................................................................................17
Data linearization.............................................................................................................................................................17
Open-thermocouple detection (OTD) ..............................................................................................................................17
USB connector..................................................................................................................................................18
LED ..................................................................................................................................................................18
Power................................................................................................................................................................18
Chapter 5
Specifications......................................................................................................................................19
Analog input .....................................................................................................................................................19
Channel configurations.....................................................................................................................................19
Accuracy...........................................................................................................................................................20
Thermocouple measurement accuracy.............................................................................................................................20
Throughput rate ................................................................................................................................................20
4
RedLab TC User's Guide
Digital input/output...........................................................................................................................................21
Memory ............................................................................................................................................................21
Microcontroller.................................................................................................................................................21
USB +5V voltage .............................................................................................................................................21
Power................................................................................................................................................................22
USB specifications ...........................................................................................................................................22
Environmental ..................................................................................................................................................22
Mechanical .......................................................................................................................................................22
Screw terminal connector type and pin out.......................................................................................................22
Screw terminal pin out.....................................................................................................................................................23
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Preface
About this User’s Guide
What you will learn from this user’s guide
This user’s guide explains how to install, configure, and use the RedLab TC so that you get the most out of its USB-based temperature measurement features.
This user’s guide also refers you to related documents available on our web site, and to technical support resources.
Conventions in this user’s guide
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
<#:#> Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example: The InstaCal installation procedure is explained in the Quick Start Guide. Never touch the exposed pins or circuit connections on the board.
Where to find more information
The following electronic documents provide helpful information relevant to the operation of the RedLab TC.
The Quick Start Guide is available on our RedLab CD in the root directory. The Guide to Signal Connections is available on our RedLab CD under „ICalUL\Documents“. The Universal Library User's Guide is available on our RedLab CD under „ICalUL\Documents“. The Universal Library Function Reference is available on our RedLab CD under „ICalUL\Documents“. The Universal Library for LabVIEW
„ICalUL\Documents“.
™
User’s Guide is available on our RedLab CD under
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Chapter 1
Introducing the RedLab TC
Overview: RedLab TC features
This user's guide contains all of the information you need to connect the RedLab TC to your computer and to the signals you want to measure.
The RedLab TC is a USB 2.0 full-speed, thermocouple input module that is supported under popular Microsoft Windows
The RedLab 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 RedLab TC, you can take measurements from type J, K, R, S, T, N, E, and B thermocouples.
The RedLab 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 RedLab 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.
®
operating systems. The RedLab TC is fully compatible with both USB 1.1 and USB 2.0 ports.
®
The RedLab TC is fully software calibrated.
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RedLab TC User's Guide Introducing the RedLab TC
RedLab TC block diagram
RedLab TC functions are illustrated in the block diagram shown here.
Precision
5V Ref.
DIO
USB
USB
Micro
USB
+5V
I/O
Isolator
Isolated
DC/DC
500 V
Isolation
Barrier
8
Isolated
Micro
Te mp
sensor
(+12)
(-12)
Figure 1. RedLab TC functional block diagram
SPI
24-bit A/D
(CH0, CH1)
24-bit A/D
(CH2, CH3)
24-bit A/D
(CH4, CH5)
24-bit A/D
(CH6, CH7)
Input mux.
Input mux.
CJC
CH0-3
Input mux.
Input mux.
CJC
CH4-7
Screw terminalScrew terminalScrew terminal
Software features
For information on the features of InstaCal and the other software included with your RedLab TC, refer to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF on our RedLab
CD (root directory).
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