1. Manuals
  2. Brands
  3. Measurement Computing Manuals
  4. Data Loggers
  5. USB-TEMP
  6. User manual

Measurement Computing USB-TEMP User Manual

Usb-based high-precision 8-channel temperature measurement module
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the USB-TEMP and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Measurement Computing USB-TEMP

Summary of Contents for Measurement Computing USB-TEMP

  • Page 2 USB-TEMP Measurement Advantage™ brand USB-based High-Precision 8-Channel Temperature Measurement 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

    Introducing the USB-TEMP ......................1-1 Overview: USB-TEMP features ........................1-1 USB-TEMP block diagram..........................1-2 Software features ............................1-2 Connecting a USB-TEMP to your computer is easy ..................1-3 Chapter 2 Installing the USB-TEMP ........................2-1 What comes with your USB-TEMP shipment? ....................2-1 Hardware ..................................
  • Page 6 USB-TEMP User's Guide Data linearization ................................4-2 USB connector ............................... 4-2 LED ................................4-2 Power................................4-2 Chapter 5 Specifications ............................ 5-1 Analog input section............................5-1 Channel configurations........................... 5-2 Compatible sensors............................5-2 Accuracy................................. 5-3 Thermocouple measurement accuracy ........................... 5-3 Semiconductor sensor measurement accuracy ....................... 5-3 RTD measurement accuracy ............................

  • Page 7: 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-TEMP 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-Temp

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

  • Page 10: Usb-Temp Block Diagram

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

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

    Microsoft HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for your USB-TEMP. No third-party device driver is required. The USB-TEMP is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to configure.

  • Page 13: Installing The Usb-Temp

    The following items should be included with your shipment. USB-TEMP 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

    Installing the hardware To connect the USB-TEMP to your system, turn your computer on, and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer. The USB cable provides power and communication to the USB-TEMP.

  • Page 15: Configuring The Usb-Temp

    Installing the USB-TEMP If the LED turns off If the LED is lit but then turns off, the computer has lost communication with the USB-TEMP. To restore communication, disconnect the USB cable from the computer, and then reconnect it. This should restore communication, and the LED should turn back on.

  • Page 17: Sensor Connections

    Screw terminal pin out The USB-TEMP has four rows of screw terminals — two rows on the top edge of the housing, and two rows on the bottom edge. Each row has 26 connections. Between each bank of screw terminals are two integrated CJC sensors used for thermocouple measurements.

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

    Do not connect two different sensor categories to the same channel pair The USB-TEMP provides a 24 bit A/D converter for each channel pair. Each channel pair can monitor one sensor category. To monitor a sensor from a different category, connect the sensor to a different channel pair (input terminals).

  • Page 19: Four-Wire, Two Sensor Common Terminals (4W01 To 4W67)

    CJC sensors The USB-TEMP has two built in high-resolution temperature sensors. One sensor is located on the right side of the package, and one sensor is located at the left side. Thermocouple connections A thermocouple consists of two dissimilar metals that are joined together at one end.

  • Page 20: Rtd And Thermistor Connections

    RTD maximum resistance Resistance values greater than 660 Ω cannot be measured by the USB-TEMP in the RTD mode. The 660 Ω resistance limit includes the total resistance across the current excitation (±Ix) pins, which is the sum of the RTD resistance and the lead resistances.

  • Page 21: Three-Wire Configuration

    Figure 3-5. Figure 3-5. Three-wire RTD or thermistor sensor measurement configuration When you select a three-wire sensor configuration with InstaCal, the USB-TEMP measures the lead resistance on the first channel (C#H/C#L) and measures the sensor itself using the second channel (C#H/C#L).

  • Page 22: Four-Wire Configuration

    Connect your sensor with a four-wire configuration when your application requires very high accuracy measurements. Examples of a four-wire single-sensor measurement configuration are shown in Figure 3-6 and Figure 3-7. You can configure the USB-TEMP with either a single sensor per channel or two sensors per channel pair. Four-wire, single-sensor A four-wire, single-sensor connected to the first channel of a channel pair is shown in Figure 3-6.

  • Page 23: Semiconductor Sensor Measurements

    When you configure the digital bits for input, you can use the USB-TEMP digital I/O terminals to detect the state of any TTL-level input. Refer to the schematic shown in Figure 3-10. If you set the switch to the +5V input, DIO0 reads TRUE (1).

  • Page 25: Functional Details

    The USB-TEMP has two high-resolution temperature sensors that are integrated into the design of the USB-TEMP. One sensor is located on the right side of the package, and one sensor is located at the left side. The CJC sensors measure the average temperature at the terminal blocks so that the cold junction voltage can be calculated.

  • Page 26: Rtd And Thermistor Measurements

    The USB connector provides +5V power and communication. No external power supply is required. The LED indicates the communication status of the USB-TEMP. It uses up to 5 mA of current. Table 4-2 defines the function of the USB-TEMP LED.

  • Page 27: 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...

  • Page 28: Channel Configurations

    4 differential channels 4-wire input configuration 8 differential channels Internally, the USB-TEMP has four, dual-channel, fully differential A/Ds providing a Note 1: total of eight differential channels. The analog input channels are therefore configured in four channel pairs with CH0/CH1 sensor inputs, CH2/CH3 sensor inputs, CH4/CH5 sensor inputs, and CH6/CH7 sensor inputs paired together.

  • Page 29: Accuracy

    Thermocouples must be connected to the USB-TEMP such that they are floating with Note 5: respect to GND (pins 9, 19, 28, 38). The USB-TEMP GND pins are isolated from earth ground, so connecting thermocouple sensors to voltages referenced to earth ground is permissible as long as the isolation between the GND pins and earth ground is maintained.

  • Page 30: Rtd Measurement Accuracy

    Note 8: performed using a Callendar-Van Dusen linearization algorithm. These specs are for one year while operation of the USB-TEMP unit is between 15 °C and 35 °C. The specification does not include lead resistance errors for 2-wire RTD connections. Please contact your sensor supplier for details on the actual sensor error limitations.

  • Page 31: Throughput Rate

    16 kΩ 29 kΩ 95 kΩ Resistance values greater than 180k ohms cannot be measured by the USB-TEMP in the Note 12: thermistor mode. The 180k ohm resistance limit includes the total resistance across the current excitation (±Ix) pins, which is the sum of the thermistor resistance and the lead resistances.

  • Page 32: Digital Input/Output

    Output high voltage (IOH = -2.5 mA) 3.8 V min. All ground pins on the USB-TEMP (pins 9, 19, 28, 38) are common and are isolated from Note 15: 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 33: Power

    Isolation Measurement system to PC 500 VDC min. This is the total current requirement for the USB-TEMP which includes up to 10 mA for Note 16: the status LED. Self-Powered Hub refers to a USB hub with an external power supply. Self-powered hubs Note 17: allow a connected USB device to draw up to 500 mA.

  • Page 34: Environmental

    USB-TEMP User's Guide Specifications The USB-TEMP has four current excitation outputs, with ±I1 dedicated to the CH0/CH1 Note 18: analog inputs, ±I2 dedicated to CH2/CH3, ±I3 dedicated to CH4/CH5, and ±I4 dedicated to CH6/CH7. The excitation output currents should always be used in this dedicated configuration.

  • Page 35: Screw Terminal Pin Out

    USB-TEMP User's Guide Specifications Screw terminal pin out Table 5-20. Screw terminal pin out Signal Pin Description Signal Pin Description Name Name CH0/CH1 current excitation source CH6/CH7 current excitation return CH0 sensor input (+) CH7 sensor input ( CH7 sensor input (+)
  • Page 36 Measurement Computing Corporation 16 Commerce Boulevard, Middleboro, Massachusetts 02346 (508) 946-5100 Fax: (508) 946-9500 E-mail: info@mccdaq.com www.mccdaq.com...

Table of Contents