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Measurement Computing Measurement Advantage USB-TC User Manual

Usb-based 8-channel thermocouple input module
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Summary of Contents for Measurement Computing Measurement Advantage USB-TC

  • Page 2 USB-TC Measurement Advantage™ brand USB-based 8-Channel Thermocouple Input Module User's Guide Document Revision 2, March, 2005 © Copyright 2005, Measurement Computing Corporation...
  • Page 3 Measurement Computing. Thank you for choosing a Measurement Computing product—and congratulations! You own the finest, and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support. It’s the embodiment of our two missions: To offer the highest-quality, computer-based data acquisition, control, and GPIB hardware and software available—at...
  • Page 4 The remedies provided herein are the buyer’s sole and exclusive remedies. Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect, special, incidental or consequential damage arising from the use of its products, even if Measurement Computing Corporation has been notified in advance of the possibility of such damages.

  • Page 5: Table Of Contents

    Table of Contents Preface About this User’s Guide ........................v What you will learn from this user’s guide......................v Conventions in this user’s guide.........................v Where to find more information .........................v Chapter 1 Introducing the USB-TC ........................1-1 Overview: USB-TC features........................... 1-1 USB-TC block diagram ..........................1-2 Software features ............................
  • Page 6 USB-TC User's Guide Thermocouple measurement accuracy ........................... 5-2 Throughput rate .............................. 5-2 Digital input/output ............................5-3 Memory ................................5-3 Microcontroller............................... 5-3 USB +5V voltage ............................5-3 Power................................5-4 USB specifications ............................5-4 Environmental ..............................5-4 Mechanical ..............................5-4 Screw terminal connector type and pin out ....................5-5 Screw terminal pin out ..............................

  • Page 7: Preface

    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 USB-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 that can also help you get the most out of these boards.

  • Page 9: Introducing The Usb-Tc

    Chapter 1 Introducing the USB-TC Overview: USB-TC features This user's guide contains all of the information you need to connect the USB-TC to your computer and to the signals you want to measure. The USB-TC is part of the Measurement Advantage™ brand of USB- based data acquisition products.

  • Page 10: Usb-Tc Block Diagram

    USB-TC User's Guide Introducing the USB-TC USB-TC block diagram USB-TC functions are illustrated in the block diagram shown here. Precision 5V Ref. Input 24-bit A/D (CH0, CH1) mux. Isolated Input 24-bit A/D Isolator Micro Micro (CH2, CH3) mux. Temp sensor CH0-3 (+12) Isolated...

  • Page 11: Connecting A Usb-Tc To Your Computer Is Easy

    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.

  • Page 13: Installing The Usb-Tc

    The following items should be included with your shipment. USB-TC USB cable (2 meter length) Software The Measurement Computing Data Acquisition Software CD contains the following software: InstaCal installation, calibration, and test utility TracerDAQ suite of virtual instruments SoftWIRE for VS .NET SoftWIRE MCC DAQ Components for .NET...

  • Page 14: Documentation

    If your USB-TC is damaged, notify Measurement Computing Corporation immediately by phone, fax, or e-mail. For international customers, contact your local distributor where you purchased the USB-TC.

  • Page 15: Configuring The Usb-Tc

    USB-TC User's Guide Installing the USB-TC Configuring the USB-TC All hardware configuration options on the USB-TC are programmable with software. Use InstaCal to set the thermocouple type for each channel pair. Configuration options are stored on the USB-TC 's isolated microcontroller in EEPROM, which is non-volatile memory on the USB-TC module.

  • Page 17: Sensor Connections

    Chapter 3 Sensor Connections The USB-TC supports type types J, K, R, S, T, N, E, and B thermocouples. Thermocouple selection The thermocouple type you select will depend on your application needs. Review the temperature ranges and accuracies of each type to determine which is best suited for your application. Screw terminal pin out The USB-TC has four rows of screw terminals —...

  • Page 18: Thermocouple Input Terminals (C0H/C0L To C7H/C7L)

    USB-TC User's Guide Sensor Connections Table 3-1. USB-TC screw terminal descriptions Signal Name Pin Description Signal Name Pin Description RSVD Reserved, Do Not Use RSVD Reserved, Do Not Use Not connected Ground CH0 sensor input (+) CH7 sensor input ( CH7 sensor input (+) CH0 sensor input ( Not connected...

  • Page 19: Thermocouple Connections

    USB-TC User's Guide Sensor Connections Thermocouple connections A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the metals is heated or cooled, a voltage is produced that correlates to temperature. The USB-TC makes fully differential thermocouple measurements without the need of ground- referencing resistors.
  • Page 20 USB-TC User's Guide Sensor Connections All ground pins on the USB-TC (pins 9, 19, 28, 38) are isolated from earth ground. If a connection is made to earth ground when using digital I/O and conductive thermocouples, the thermocouples are no longer isolated.

  • Page 21: Functional Details

    Chapter 4 Functional Details Thermocouple measurements A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the metals is heated or cooled, a voltage is produced that correlates to temperature. The USB-TC hardware level-shifts the thermocouple’s output voltage into the A/D’s common mode input range by applying +2.5 V to the thermocouple’s low side at the C#L input.

  • Page 22: Usb Connector

    USB-TC User's Guide Functional Details To reduce the error, reduce the length of the thermocouple to lower its resistance, or lower the AWG of the wire by using a wire with a larger diameter. With open-thermocouple detection disabled, 30 nA (max.) of input leakage current is injected into the thermocouple.

  • Page 23: Specifications

    Chapter 5 Specifications Typical for 25 °C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input section Table 5-1. Generic analog input specifications Parameter Conditions Specification A/D converters Four dual 24-bit, Sigma-Delta type Number of channels 8 differential Input isolation 500 VDC minimum between field wiring and...

  • Page 24: Accuracy

    USB-TC User's Guide Specifications Accuracy Thermocouple measurement accuracy Table 5-3. Thermocouple accuracy specifications, including CJC measurement error Sensor Type Maximum error Typical error Temperature range ±0.575 °C ±0.279 °C -210 to 1200 °C ±0.629 °C ±0.309 °C -200 to 1372 °C ±1.159 °C ±0.991 °C -50 to 1768.1 °C...

  • Page 25: Digital Input/Output

    USB-TC User's Guide Specifications Digital input/output Table 5-5. Digital input/output specifications Digital type CMOS Number of I/O 8 (DIO0 through DIO7) Configuration Independently configured for input or output. Power on reset is input mode. Pull up/pull-down configuration All pins pulled up to +5 V via 47 K resistors (default). Pull down to ground (GND) also available.

  • Page 26: Power

    USB-TC User's Guide Specifications Power Table 5-9. Power specifications Parameter Conditions Specification Supply current USB enumeration <100 mA Supply current Continuous mode 70 mA max. (Note 8) User +5V output voltage range Connected to self-powered hub. (Note 9) 4.75 V min. to (terminal block pin 21 and 47) 5.25 V max.

  • Page 27: Screw Terminal Connector Type And Pin Out

    USB-TC User's Guide Specifications Screw terminal connector type and pin out Table 5-13. Screw terminal connector specifications Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Screw terminal pin out Table 5-14. Screw terminal pin out Signal Name Pin Description Signal Name Pin Description...
  • Page 28 Measurement Computing Corporation 16 Commerce Boulevard, Middleboro, Massachusetts 02346 (508) 946-5100 Fax: (508) 946-9500 E-mail: info@mccdaq.com www.mccdaq.com...

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