User`s Manual
Contents
1. 24 bit A D E 5 Screw Terminal USB 2 0 Isolated SR Mi II Isolator Micro DI icrocontroller A e gt i Isolated 12 or 5V C DC 12 1 l 7 24 bit A D Ll cha CHS 3 E 1 E po x I 500 V O amp i 24 bit A D C Isolation Barrier icH CH7 3 Figure 1 1 USB TEMP functional block diagram Software features For information on the features of InstaCal and the other software included with your USB TEMP refer to the Quick Start Guide that shipped with your device The Quick Start Guide is also available in PDF at www mecdag com PDFmanuals DAQ Software Quick Start pdf Check www mccdaq com download htm for the latest software version USB TEMP User s Guide Introducing the USB TEMP Connecting a USB TEMP to your computer is easy Installing a data acquisition device has never been easier The USB TEMP 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 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 You can connect the USB TEMP before or after you install the software and without powering down your com2. 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 14 USB TEMP User s Guide Sensor Connections Current excitation output terminals 11 to 14 The USB TEMP has four dedicated pairs of current excitation output terminals 11 to 14 These terminals have a built in precision current source to provide excitation for the resistive sensors used for RTD and thermistor measurements Each current excitation terminal is dedicated to one pair of sensor input channels J1 is the current excitation source for channel 0 and channel 1 2 is the current excitation source for channel 2 and channel 3 I3 is the current excitation source for channel 4 and channel 5 J4 is the current excitation source for channel 6 and channel 7 Four wire two sensor common terminals 4W01 to 4W67 These terminals are used as the common connection for four wire configurations with two RTD or thermistor sensors Two sensor common terminals IC01 to IC67 These terminals are used as the common connection for two wire configurations with two RTD or thermistor sensors Ground terminals GND The six ground terminals GND provide a common ground for the input channels and DIO bits and are isolated 500 VDC from the USB GND Power terminals 5V The two 5V output terminals are isolated 500 VDC from the USB 5
3. 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 A software algorithm automatically corrects for the additional thermocouples created at the terminal blocks by subtracting the calculated cold junction voltage from the analog input s thermocouple voltage measurement Increasing the thermocouple length 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 Data linearization After the CJC correction is performed on the measurement data an on board microcontroller automatically linearizes the thermocouple measurement data using National Institute of Standards and Technology NIST linearization coefficients for the selected thermocouple type The measurement data is then output as a 32 bit floating point value in the configured format voltage or temperature Open thermocouple detection OTD The USB TEMP is equipped with an open thermocouple detection for each analog input channel With OTD any open circuit or short circuit condition at the thermocouple sensor is detected by the software An open channel is detected by driving the input voltage to a negative value
4. 0 C 0 691 C 0 345 C 0 to 1372 C S 2 491 C 0 648 C 50 to 250 C 1 841 C 0 399 C 250 to 1768 1 C R 2 653 C 0 650 C 50 to 250 C 1 070 C 0 358 C 250 to 1768 1 C B 1 779 C 0 581 C 250 to 700 C 0 912 C 0 369 C 700 to 1820 C E 1 471 C 0 462 C 200 to 0 C 0 639 C 0 245 C 0 to 1000 C T 1 717 C 0 514 C 200 to 0 C 0 713 C 0 256 C 0 to 600 C N 1 969 C 0 502 C 200 to 0 C 0 769 C 0 272 C 0 to 1300 C Note 4 Thermocouple measurement accuracy specifications include linearization cold junction Note 5 Note 6 compensation and system noise These specs are for one year or 3000 operating hours whichever comes first and for operation of the USB TEMP between 15 C and 35 C For measurements outside this range add 0 5 degree to the maximum error shown There are CJC sensors on each side of the module The accuracy listed above assumes the screw terminals are at the same temperature as the CJC sensor Errors shown do not include inherent thermocouple error Please contact your thermocouple supplier for details on the actual thermocouple error Thermocouples must be connected to the USB TEMP such that they are floating with 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 an
5. 35 NC 36 14 38 GND 39 C5L 40 C5H 41 1045 42 4W45 43 C4L 44 C4H 45 NC 46 13 47 5V 48 GND 49 DIO7 50 DIO6 51 DIO5 52 DIO4 27 14 CJC Sensor 37 13 8 OWOOOOOOOO OWOOOOOGDGOGDOOOOO DWOOCWDDODOO OWDDOOGOODODOOOO Do o 0 Pes i z 000 COH S o co 4WO01 c01 Figure 13 USB TEMP User s Guide Sensor Connections USB TEMP screw terminal descriptions Pin Signal Pin Description Pin Signal Pin Description Name Name 1 11 CHO CH1 current excitation source 27 14 CH6 CH7 current excitation return 2 NC Not connected 28 GND Ground 3 COH CHO sensor input 29 C7L CH7 sensor input 4 COL CHO sensor input 30 C7H CH7 sensor input 5 4W01 CHO CH1 4 wire 2 sensor common 31 1C67 CH6 CH7 2 sensor common 6 IC01 CHO CH1 2 sensor common 32 4W67 CH6 CH7 4 wire 2 sensor common 7 C1H CH1 sensor input 33 C6L CH6 sensor input 8 eL CH1 sensor input 34 C6H CH6 sensor input 9 GND Ground 35 NC Not connected 10 11 CHO CH1 current excitation return 36 14 CH6 CH7 current excitation source CJC sensor CJC sensor 11 12 CH2 CH3 current excitation source 37 13 CH4 CH5 current excitation return 12 NC Not connected 38 GND Ground 13 C2H CH2 sensor input 39 C5L CH5 sensor input 14 C2L CH2 sensor input 40 C5H CH5 sensor input 15 4W
6. C 0 25 C typ 0 5 C max 0 C to 70 C 1 0 to 0 5 C max 23 USB TEMP User s Guide Specifications Channel configurations Table 2 Channel configuration specifications Sensor Category Conditions Specification Disabled Thermocouple 8 differential channels Semiconductor sensor 8 differential channels RTD and thermistor 2 wire input configuration with a single sensor 4 differential channels 2 wire input configuration with two sensors 8 differential channels 3 wire configuration with a single sensor per channel pair 4 differential channels 4 wire input configuration with a single sensor 2 differential channels 4 wire input configuration with two sensors 4 differential channels Note 1 Internally the USB TEMP has four dual channel fully differential A Ds providing a total of Note 2 Note 3 eight differential channels The analog input channels are therefore configured in four channel pairs with CHO CH1 sensor inputs CH2 CH3 sensor inputs CH4 CHS sensor inputs and CH6 CH7 sensor inputs paired together This channel pairing requires the analog input channel pairs be configured to monitor the same category of temperature sensor Mixing different sensor types of the same category such as a type J thermocouple on channel 0 and a type T thermocouple on channel 1 is valid Channel configuration information is stored in the EEPROM of the isolated mi
7. CH6 sensor input 8 C1L CH1 sensor input 34 C6H CH6 sensor input 9 GND 35 NC 10 11 CHO CH1 current excitation return 36 14 CH6 CH7 current excitation source CJC sensor CJC sensor 11 12 CH2 CH3 current excitation source 37 13 CH4 CH5 current excitation return 12 NC 38 GND 13 C2H CH2 sensor input 39 C5L CH5 sensor input 14 C2L CH2 sensor input 40 C5H CH5 sensor input 15 4W23 CH2 CH3 4 wire 2 sensor common 41 1C45 CH4 CH5 2 sensor common 16 IC23 CH2 CH3 2 sensor common 42 4W45 CH4 CH5 4 wire 2 sensor common 17 C3H CH3 sensor input 43 CAL CH4 sensor input 18 C3L CH3 sensor input 44 C4H CH4 sensor input 19 GND 45 NC 20 12 CH2 CH3 current excitation return 46 13 CH4 CH5 current excitation source 21 5V 5V output 47 5V 5V output 22 GND 48 GND 23 DIOO Digital Input Output 49 DIO7 Digital Input Output 24 DIO1 Digital Input Output 50 DIO6 Digital Input Output 25 DIO2 Digital Input Output 51 DIO5 Digital Input Output 26 DIO3 Digital Input Output 52 DIO4 Digital Input Output 31 C Declaration of Conformity Manufacturer Measurement Computing Corporation Address 10 Commerce Way Suite 1008 Norton MA 02766 USA Category Electrical equipment for measurement control and laboratory use Measurement Computing Corporation declares under sole responsibility that the product USB TEMP to which this declaration relates is in conformity with the relevant pro
8. Each current excitation terminal is dedicated to one channel pair The USB TEMP makes two three and four wire measurements of RTDs 100 Q platinum type and thermistors Use InstaCal to select the sensor type and the wiring configuration Once the resistance value is calculated the value is linearized in order to convert it to a temperature value A 32 bit floating point value in either temperature or resistance is returned by software RTD maximum resistance Resistance values greater than 660 Q cannot be measured by the USB TEMP in the RTD mode The 660 Q resistance limit includes the total resistance across the current excitation Ix pins which is the sum of the RTD resistance and the lead resistances Thermistor maximum resistance Resistance values greater than 180k ohms cannot be measured by the USB TEMP in the thermistor mode The 180 k Q resistance limit includes the total resistance across the current excitation Ix pins which is the sum of the thermistor resistance and the lead resistance USB TEMP User s Guide Sensor Connections Two wire configuration The easiest way to connect an RTD sensor or thermistor to the USB TEMP is with a two wire configuration since it requires the fewest connections to the sensor With this method the two wires that provide the RTD sensor with its excitation current also measure the voltage across the sensor Since RTDs exhibit a low nominal resistan
9. PMD Temp doc 3 Trademark and Copyright Information TracerDAQ Universal Library 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 Information furnished by Measurement Computing Corporation is believed to be accurate and reliable However no responsibility is assumed by Measurement Computing Corporation neither for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation 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 Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior writt
10. TEMP shipment ccccescceseceseeseeeseeeseeseeeseeecenscensecseceeceseenaeeaeeaecseeeeeeneeaes 11 Hardware vst daa a Additional documentation Unpacking the USB T EMP ii aiii 11 Installing the software sanecon did 12 Installing the USB TEMP ui a i e AEE E EEE EE e KE EIEEE aoa 12 Configuring the USB TEMP EE A E E E S E E da inidadas 12 Calibrating the USB TEM Pirr a a a a a a aaa iea a aS 12 Chapter 3 Sensor GCONMMECHIONS ui SU Ai EE E ERE T Sensor input terminals COH COL to C7H C7L Current excitation output terminals 11 to 14 Four wire two sensor common terminals 4W01 to 4W67 Two sensor common terminals ICO1 to IC67 eee Grotind terminals ON Devon iaa idad anat Power terminal EV laicas ada dt A A Digital terminals DIOO to DIO7 A NON Thermocouple CONEA A oe A A E i E Wiring configuration RTD and thermistor connections Twoswire Conf Surationis cc cwelites scans ciyeteuss bab actia adi sesbeseest idad nants aone ea aE nE eais Three wire configuration Four wire Conf uratiOn cernent EE Waa da Tate ane eeu ade paw ah aaa Semiconductor sensor Measurements aia 19 Witing CONF QUTATION 3s2c ccis cevecesescecssce sisecd dodo dacuncetoes dosediapcntchced la uuccadesdebedde dana dadebeehsecutlcsadeschsad doin dar n dea decu enadeseosed soe 19 Digital 1 O conmect Ons soa soci A A lw Ba ee 20 Chapter 4 Functional Details Thermocouple measurements ii cece eek A Re ei dE ee 21 Cold jun
11. longer isolated In this case thermocouples must not be connected to any conductive surfaces that may be referenced to earth ground Memory Table 11 Memory specifications EEPROM 1 024 bytes isolated micro reserved for sensor configuration 256 bytes USB micro for external application use Microcontroller Table 12 Microcontroller specifications Type Two high performance 8 bit RISC microcontrollers USB 5V voltage Table 13 USB 5V voltage specifications Parameter Conditions Specification USB 5V VBUS input voltage range 4 75 V min to 5 25 V max 28 USB TEMP User s Guide Specifications Power Table 14 Power specifications Parameter Conditions Specification Supply current USB enumeration lt 100 mA Supply current Continuous mode 140 mA typ Note 16 User 5V output voltage range Connected to self powered hub Note 17 4 75 V min to terminal block pin 21 and pin 47 5 25 V max User 5V output current Bus powered and connected to a self powered hub Note 17 10 mA max terminal block pin 21 and pin 47 Isolation Measurement system to PC 500 VDC min Note 16 This is the total current requirement for the USB TEMP which includes up to 10 mA for the status LED Note 17 Self Powered Hub refers to a USB hub with an external power supply Self powered hubs allow a connected USB device to draw up to 500 mA Root Port Hubs re
12. of a channel pair is shown in Figure 3 6 EERTE O zZ 2388508 OO VOVdOOVOOVDIN Figure 3 6 Four wire single RTD or thermistor sensor measurement configuration 18 USB TEMP User s Guide Sensor Connections A four wire single sensor connected to the second channel of a channel pair is shown in Figure 3 7 Figure 3 7 Four wire single RTD or thermistor sensor measurement configuration A four wire two sensor measurement configuration is shown in Figure 3 8 Figure 3 8 Four wire two RTD or thermistor sensors measurement configuration When configured for four wire two sensor mode both sensors must be connected to obtain proper measurements Semiconductor sensor measurements Semiconductor sensors are suitable over a range of approximately 40 C to 125 C where an accuracy of 2 C is adequate The temperature measurement range of a semiconductor sensor is small when compared to thermocouples and RTDs However semiconductor sensors can be accurate inexpensive and easy to interface with other electronics for display and control The USB TEMP makes high resolution measurements of semiconductor sensors such as the LM36 or equivalent and returns a 32 bit floating point value in either a voltage or temperature format Use InstaCal to select the sensor type TMP36 or equivalent and the sensor input channel to connect the sensor Wiring configuration You can connect a TMP36 or equivalent semiconduc
13. outside the range of any thermocouple output The software recognizes this as an invalid reading and flags the appropriate channel The software continues to sample all channels when OTD is detected Input leakage current With open thermocouple detection enabled 105 nA max of input leakage current is injected into the thermocouple This current can cause an error voltage to develop across the lead resistance of the thermocouple that is indistinguishable from the thermocouple voltage you are measuring You can estimate this error voltage with the following formula error voltage resistance of the thermocouple x 105 nA 21 USB TEMP 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 RTD and thermistor measurements RTDs and thermistors are resistive devices that require an excitation current to produce a voltage drop that can be measured differentially across the sensor The USB TEMP measures the sensor resistance by forcing a known excitation current through the sensor and then measuring differentially the voltage across the sensor to determine its resistance After the voltage measurement is made the resistance of the RTD is calculated using Ohms law the sensor resistance is ca
14. 23 CH2 CH3 4 wire 2 sensor common 41 1C45 CH4 CH5 2 sensor common 16 1C23 CH2 CH3 2 sensor common 42 4W45 CH4 CH5 4 wire 2 sensor common 17 C3H CH3 sensor input 43 C4L CH4 sensor input 18 C3L CH3 sensor input 44 C4H CH4 sensor input 19 GND Ground 45 NC Not connected 20 12 CH2 CH3 current excitation return 46 13 CH4 CH5 current excitation source 21 5V 5V output 47 5V 5V output 22 GND Ground 48 GND Ground 23 DIOO Digital Input Output 49 DIO7 Digital Input Output 24 DIO1 Digital Input Output 50 DIO6 Digital Input Output 25 DIO2 Digital Input Output 51 DIO5 Digital Input Output 26 DIO3 Digital Input Output 52 DIO4 Digital Input Output Use 16 AWG to 30 AWG wire for your signal connections Tighten screw terminal connections When making connections to the screw terminals be sure to tighten the screw until tight Simply touching the top of the screw terminal is not sufficient to make a proper connection Sensor input terminals COH COL to C7H C7L You can connect up to eight temperature sensors to the differential sensor inputs COH COL to C7H C7L Supported sensor categories include thermocouples RTDs thermistors or semiconductor sensors Do not mix sensor categories within channel pairs You can mix thermocouple types J K R S T N E and B within channel pairs however 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
15. Connections is available on our web site at www mcecdag com signals signals pdf MCC s Universal Library User s Guide is available on our web site at www mccdag com PDEFmanuals sm ul user guide pdf MCC s Universal Library Function Reference is available on our web site at www mccdag com PDFmanuals sm ul functions pdf MCC s Universal Library for LabVIEW User s Guide is available on our web site at www mecdag com PDFmanuals SM UL LabVIEW pdf USB TEMP User s Guide this document is also available on our web site at www mecdaq com P DFmanuals USB TEMP pdf Chapter 1 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 a USB 2 0 full speed temperature measurement module that is supported under popular Microsoft Windows operating systems The USB TEMP is fully compatible with both USB 1 1 and USB 2 0 ports The USB TEMP provides eight differential input channels that are software programmable for different sensor categories including thermocouple RTDs thermistors and Semiconductor sensors 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 TEMP
16. USB TEMP USB based 8 channel Temperature Measurement Module User s Guide MEASUREMENT COMPUTING USB TEMP USB based High Precision 8 Channel Temperature Measurement Module User s Guide A A MEASUREMENT COMPUTING Document Revision 9 October 2006 Copyright 2006 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Refer to www mccdaq com execteam html for the names titles and contact information of each key executive at 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 mission To provide PC based data acquisition hardware and software that will save time and save money Simple installations minimize the time between setting up your system and actually making measurements We offer quick and simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system Lifetime warranty Every hardware product manufactured by Measurement Computing Corporation is warranted against defects in materials or workmanship for the life of the product Products found defective are repaired or replaced promptly Lifetime Harsh Environment Warranty We will replace any product manufacture
17. V Digital terminals DIOO to DIO7 You can connect up to eight digital I O lines to the screw terminals labeled DIOO to DIO7 Each terminal is software configurable for input or output 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 When the junction of the metals is heated or cooled a voltage is produced that correlates to temperature The USB TEMP makes fully differential thermocouple measurements without the need of ground referencing resistors A 32 bit floating point value in either a voltage or temperature format is returned by software An open thermocouple detection feature is available for each analog input which automatically detects an open or broken thermocouple Use InstaCal to select the thermocouple type J K R S T N E and B and one or more sensor input channels to connect the thermocouple 15 USB TEMP User s Guide Sensor Connections Wiring configuration Connect the thermocouple to the USB TEMP using a differential configuration as shown in Figure 3 2 Figure 3 2 Typical thermocouple connection 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 isolat
18. a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If your USB TEMP 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 TEMP 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 11 USB TEMP User s Guide Installing the USB TEMP Installing the software Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data Acquisition Software CD This booklet is available in PDF at www mccdaq com PDFmanuals DA Q Software Quick Start pdf Installing the USB TEMP 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 When you connect the USB TEMP for the first time a Found New Hardware popup balloon Windows XP or dialog other Windows versions opens as the USB TEMP is detected Found New Hardware i Found New Hardware USB TEMP sorter Windows has found new hardware and is locating the software for it When this balloon or dialog closes the installation is complete The USB LED
19. ce measurement accuracy can be affected due to the lead wire resistance For example connecting lead wires that have a resistance of 1 Q 0 5 Q each lead to a 100 Q platinum RTD will result in a 1 measurement error With a two wire configuration you can connect either one sensor per channel pair or two sensors per channel pair Two wire single sensor A two wire single sensor measurement configuration is shown in Figure 3 3 TI Ir JAQ tORRSRHEZ y FZOOTYOOOR OOOOOODOOOO Figure 3 3 Two wire single RTD or thermistor sensor measurement configuration When you select a two wire single sensor configuration with InstaCal connections to C H and C L are made internally Two wire two sensor A two wire two sensor measurement configuration is shown in Figure 3 4 TIFI ORRS E ZOOS O C L GND O O T O Figure 3 4 Two wire two RTD or thermistor sensors measurement configuration When you select a two wire two sensor configuration with InstaCal connections to C H first sensor and C H CH L second sensor are made internally When configured for two wire mode both sensors must be connected to obtain proper measurements USB TEMP User s Guide Sensor Connections Three wire configuration A three wire configuration compensates for lead wire resistance by using a single voltage sense connection With a three wire configuration you can connect only one sensor per channel pair A three wi
20. crocontroller by the firmware whenever any item is modified Modification is performed by commands issued over USB from an external application and the configuration is made non volatile through the use of the EEPROM The factory default configuration is Disabled The Disabled mode will disconnect the analog inputs from the terminal blocks and internally ground all of the A D inputs This mode also disables each of the current excitation sources Compatible sensors Table 3 Compatible sensor type specifications Parameter Conditions Thermocouple J 210 C to 1200 C K 270 C to 1372 C R 50 C to 1768 C S 50 C to 1768 C T 270 C to 400 C N 270 C to 1300 C E 270 C to 1000 C B 0 C to 1820 C RTD 100 ohm PT DIN 43760 0 00385 ohms ohm C 100 ohm PT SAMA 0 003911 ohms ohm C 100 ohm PT ITS 90 IEC75 1 0 0038505 ohms ohm C Thermistor Standard 2 252 ohm through 30 000 ohm Semiconductor IC TMP36 or equivalent 24 USB TEMP User s Guide Specifications Accuracy Thermocouple measurement accuracy Table 4 Thermocouple accuracy specifications including CJC measurement error Sensor Type Maximum error Typical error Temperature range J 1 499 C 0 507 C 210 to 0 C 0 643 C 0 312 C 0 to 1200 C K 1 761 C 0 538 C 210 to
21. ction compensation Clicr cies nen anni schaet de coxa a aeae te lona ERRE 21 Data linearization Open thermocouple detection OTD cceeceeccesecssesseesecesecseeeseeseceaecaseseeesenseceaecseeeseeseceaecaaeeseesecsaecaseeseeseceaeenseeseeseseaeente 21 RTD and thermistor measurements cccccsseesseescesseeesceeceseceseeseesecsecaeceaecaeecaeeeaeeeneseeeeeeeeeenaeennecneeeeeeseeees 22 Data linearization USB connector ai enan E A Eee abe TOUTES Oia EEG EN ERR USB TEMP User s Guide Chapter 5 SECCION rd Analog cda de Channel configurations Compatible A e e t a ACCUTACY RN Thermocouple measurement accuracy Semiconductor sensor measurement accuracy RTD measurement accuracy c ccococccoccconcninnncnnnenns Thermistor Meas OremMent ACCULA CY i Sos sesesee sacs ee Ta da Seta NE spd soap denen Throughput tate iii A ae a eel Digital mput Outpuits ii dia USBispecifications i ccc icc o atl Adee SDA eA RA SR a Current excitation outputs a Environmentalist A Bes Sek BRE AG A ee Re oes BR es BA ee es Mechanical dada Screw terminal connector type and pin out Screw terminal pi Uta ida 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 relat
22. d by Measurement Computing Corporation that is damaged even due to misuse for only 50 of the current list price I O boards face some tough operating conditions some more severe than the boards are designed to withstand When a board becomes damaged just return the unit with an order for its replacement at only 50 of the current list price We don t need to profit from your misfortune By the way we honor this warranty for any manufacturer s board that we have a replacement for 30 Day Money Back Guarantee You may return any Measurement Computing Corporation product within 30 days of purchase for a full refund of the price paid for the product being returned If you are not satisfied or chose the wrong product by mistake you do not have to keep it Please call for an RMA number first No credits or returns accepted without a copy of the original invoice Some software products are subject to a repackaging fee These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application 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 HM
23. d earth ground is maintained When thermocouples are attached to conductive surfaces the voltage differential between multiple thermocouples must remain within 1 4 V For best results we recommend the use of insulated or ungrounded thermocouples when possible Semiconductor sensor measurement accuracy Table 5 Semiconductor sensor accuracy specifications Sensor Type Temperature Range C Maximum Accuracy Error TMP36 or equivalent 40 to 150 C 0 50 C Note 7 Error shown does not include errors of the sensor itself These specs are for one year while operation of the USB TEMP unit is between 15 C and 35 C Please contact your sensor supplier for details on the actual sensor error limitations 25 USB TEMP User s Guide Specifications RTD measurement accuracy Table 6 RTD measurement accuracy specifications RTD Sensor Maximum Accuracy Error C Typical Accuracy Error C Temperature Ix 210 pA Ix 210 pA PT100 DIN US or 200 C to 150 C 2 85 2 59 ITS 90 150 C to 100 C 1 24 0 97 100 C to 0 C 0 58 0 31 0 C to 100 C 0 38 0 11 100 C to 300 C 0 39 0 12 300 C to 600 C 0 40 0 12 Note 8 Error shown does not include errors of the sensor itself The sensor linearization is performed using a Callendar Van Dusen linearization algorithm These specs are for one year while operation of the USB TEMP
24. dedicated to CH4 CHS and 14 dedicated to CH6 CH7 The excitation output currents should always be used in this dedicated configuration Note 19 The current excitation outputs are automatically configured based on the sensor thermistor or RTD selected Environmental Table 17 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 85 C Humidity 0 to 90 non condensing Mechanical Table 18 Mechanical specifications Dimensions 127 mm L x 88 9 mm W x 35 56 H User connection length 3 meters max 30 USB TEMP User s Guide Specifications Screw terminal connector type and pin out Table 19 Screw terminal connector specifications Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Screw terminal pin out Table 20 Screw terminal pin out Pin Signal Name Pin Description Pin Signal Name Pin Description 1 11 CHO CH1 current excitation source 27 14 CH6 CH7 current excitation return 2 NC 28 GND 3 COH CHO sensor input 29 C7L CH7 sensor input 4 COL CHO sensor input 30 C7H CH7 sensor input 5 4W01 CHO CH1 4 wire 2 sensor common 31 1C67 CH6 CH7 2 sensor common 6 1C01 CHO CH1 2 sensor common 32 4W67 CH6 CH7 4 wire 2 sensor common 7 C1H CH1 sensor input 33 C6L
25. ed 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 lt t gt 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 JnstaCal 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 USB TEMP MCC s Specifications USB TEMP the PDF version of the Specifications chapter in this guide is available on our web site at www mccdaq com pdfs USB TEMP pdf MCC s Quick Start Guide is available on our web site at www mccdaq com PDFmanuals DAQ Software Quick Start pdf MCC s Guide to Signal
26. en consent from Measurement Computing Corporation Life support devices systems are devices or systems which a are intended for surgical implantation into the body or b support or sustain life and whose failure to perform can be reasonably expected to result in injury Measurement Computing Corporation products are not designed with the components required and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people Table of Contents Preface About this Usen s Guide cannot cctectseeizacasaccucatsarsavantectcucsteeteuneveasagccseshadeasencceess 7 What you will learn from this user s QUidC cceceesseesceesceeseeseceecesecsecsaecaaecseenaeceaecsaecaeecaeseneeeaeeneeeeeeesaeenaeenaes T Conventions in this USES guide iii ida 7 Where to find more information isons sereias ieie EES EEEE E eE aR ae E Eei iaa Eia 7 Chapter 1 Introducing the USB TEMP coccion 8 Overview USB TEMP features ici tddi 8 USB TEMP block diagram ccccsscessessseessssecesesecsseseseconecossensenscsuessuesssesesusesssesaesonsconesecensesnsessetseeenasensss 9 Software features AS iaa ainda 9 Connecting a USB TEMP to your computer is easy cooocooccococoncnoncnononononononnnnononn ron cnn n non rn nn nn nr nn nn non rann ran rrnn ninia 10 Chapter 2 installing the USB TEMP iia a E cetecvenctecautusteescucecerdspucredvsnvexvemceess 11 What comes with your USB
27. ion between the GND pins 9 19 28 38 and earth ground is maintained When thermocouples are attached to conductive surfaces the voltage differential between multiple thermocouples must remain within 1 4 V For best results we recommend the use of insulated or ungrounded thermocouples when possible Maximum input voltage between analog input and ground The absolute maximum input voltage between an analog input and the isolated GND pins is 25 VDC when the USB TEMP is powered on and 40 VDC when the USB TEMP is powered off 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 RTD and thermistor connections A resistance temperature detector RTD measures temperature by correlating the resistance of the RTD element with temperature A thermistor is a thermally sensitive resistor that is similar to an RTD in that its resistance changes with temperature thermistors show a large change in resistance that is proportional to a small change in temperature The main difference between RTD and thermistor measurements is the method used to linearize the sensor data RTDs and thermistors are resistive devices that require an excitation current to produce a voltage drop that can be measured differentially across the sensor The USB TEMP features four built in current excitation sources I1 to 14 for measuring resistive type sensors
28. lculated by dividing the measured voltage by the current excitation level Ix source The value of the Ix source is stored in local memory Once the resistance value is calculated the value is linearized in order to convert it to a temperature value The measurement is returned by software as a 32 bit floating point value in a voltage resistance or temperature format Data linearization An on board microcontroller automatically performs linearization on RTD and thermistor measurements RTD measurements are linearized using a Callendar Van Dusen coefficients algorithm you select DIN SAMA or ITS 90 Thermistor measurements are linearized using a Steinhart Hart linearization algorithm you supply the coefficients from the sensor manufacturer s data sheet USB connector The USB connector provides 5V power and communication No external power supply is required LED The LED indicates the communication status of the USB TEMP It uses up to 5 mA of current The table below defines the function of the USB TEMP LED LED Illumination LED Indication Illumination Steady green The USB TEMP is connected to a computer or external USB hub Pulsing green Data is being transferred Upon connection the LED should flash three times and then remain lit indicates a successful installation Power The two 5V terminals are isolated 500VDC from the USB 5V Caution Each 5V terminal is an output Do not co
29. ments For RTD or thermistor measurements this warm up time is also required to stabilize the internal current reference Calibrating the USB TEMP The USB TEMP is fully calibrated via software JnstaCal prompts you to run its calibration utility when you change from one sensor category to another Allow the USB TEMP to operate for at least 30 minutes before calibrating This warm up time minimizes thermal drift and achieves the specified rated accuracy of measurements 12 Chapter 3 Sensor Connections The USB TEMP supports the following temperature sensor types Thermocouple types J K R S T N E and B Resistance temperature detectors RTDs 2 3 or 4 wire measurement modes of 100 Q platinum RTDs Thermistors 2 3 or 4 wire measurement modes Semiconductor temperature sensors LM36 or equivalent Sensor selection The type of sensor you select will depend on your application needs Review the temperature ranges and accuracies of each sensor type to determine which is best suited for your application 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 Signals are identified in Figure 3 1 28 GND 29 C7L 30 C7H 31 1C67 32 4W67 33 C6L 34 C6H
30. nnect to an external power supply or you may damage the USB TEMP and possibly the computer 22 Chapter 5 Specifications Typical for 25 C unless otherwise specified Specifications in italic text are guaranteed by design Analog input Table 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 USB interface Channel configuration Software programmable to match sensor type Differential input voltage range Thermocouple 0 080 V for the various sensor categories RTD 0 to 0 5 V Thermistor 0to2V Semiconductor sensor 0 to 2 5 V Absolute maximum input voltage C0x through C7x relative to GND pins 9 19 28 38 25 V power on 40 V power off Input impedance 5 Gigohm min Input leakage current Open thermocouple detect 30 nA max disabled Open thermocouple detect 105 nA max enabled Normal mode rejection ratio fin 60 Hz 90 dB min Common mode rejection ratio Tin 50 Hz 60 Hz 100 dB min Resolution 24 bits No missing codes 24 bits Input coupling DC Warm up time 30 minutes min Open thermocouple detect Automatically enabled when the channel pair is configured for thermocouple sensor The maximum open detection time is 3 seconds CJC sensor accuracy 15 C to 35
31. onductive surfaces that may be referenced to earth ground For general information regarding digital signal connections and digital I O techniques refer to the Guide to Signal Connections available on our web site at www mccdag com signals signals pdf 20 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 TEMP 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 Always connect thermocouple sensors to the USB TEMP in a floating fashion Do not attempt to connect the thermocouple low side C L to GND or to a ground referencing resistor Cold junction compensation CJC When you connect the thermocouple sensor leads to the sensor input channel the dissimilar metals at the USB TEMP terminal blocks produce an additional thermocouple junction This junction creates a small voltage error term which must be removed from the overall sensor measurement using a cold junction compensation technique The measured voltage includes both the thermocouple voltage and the cold junction voltage To compensate for the additional cold junction voltage the USB TEMP subtracts the cold junction voltage from the thermocouple voltage
32. puter 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 10 Chapter 2 Installing the USB TEMP What comes with your USB TEMP shipment The following items are shipped with the USB TEMP Hardware USB TEMP USB cable 2 meter length Additional documentation In addition to this hardware user s guide you should also receive the Quick Start Guide available in PDF at www mecdag com PDFmanuals DAQ Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB TEMP and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB TEMP As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB TEMP from its packaging ground yourself using
33. re measurement configuration is shown in Figure 3 5 O Z I O 4wit ICHH O C H C L GND I O O O O C H CHL 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 This configuration compensates for any lead wire resistance and temperature change in lead wire resistance Connections to C H for the first channel and C H C L of the second channel are made internally Three wire compensation For accurate three wire compensation the individual lead resistances connected to the I pins must be of equal resistance value Four wire configuration With a four wire configuration connect two sets of sense excitation wires at each end of the RTD or thermistor sensor This configuration completely compensates for any lead wire resistance and temperature change in lead wire resistance 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
34. should flash and then remain lit This indicates that communication is established between the USB TEMP and your computer Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB TEMP or you may lose data and or your ability to communicate with 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 Configuring the USB TEMP All hardware configuration options on the USB TEMP are programmable with software Use InstaCal to set the sensor type for each channel The configurable options dynamically update according to the selected sensor category Configuration options are stored on the USB TEMP s isolated microcontroller in EEPROM which is non volatile memory on the USB TEMP module Configuration options are loaded on power up Default configuration The factory default configuration is Disabled The Disabled mode disconnects the analog inputs from the terminal blocks and internally grounds all of the A D inputs This mode also disables each of the current excitation sources Warm up Allow the USB TEMP to warm up for 30 minutes before taking measurements This warm up time minimizes thermal drift and achieves the specified rated accuracy of measure
35. side in the PC s USB Host Controller The USB port s on your PC are root port hubs All externally powered root port hubs desktop PC s provide up to 500 mA of current for a USB device Battery powered root port hubs provide 100 mA or 500 mA depending upon the manufacturer A laptop PC that is not connected to an external power adapter is an example of a battery powered root port hub USB specifications Table 15 USB specifications USB device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Self powered 100 mA consumption max USB cable type A B cable UL type AWM 2527 or equivalent min 24 AWG VBUS GND min 28 AWG D D USB cable length 3 meters max 29 USB TEMP User s Guide Specifications Current excitation outputs Ix Table 16 Current excitation output specifications Parameter Conditions Specification Configuration 4 dedicated pairs 11 CHO CH1 12 CH2 CH3 13 CH4 CH5 14 CH6 CH7 Current excitation output ranges Thermistor 10 uA typ RTD 210 A typ Tolerance 5 typ Drift 200 ppm C Line regulation 2 1 ppm V max Load regulation 0 3 ppm V typ Output compliance voltage 3 90 V max relative to GND pins 9 19 28 38 0 03 V min Note 18 The USB TEMP has four current excitation outputs with I1 dedicated to the CHO CH1 analog inputs 12 dedicated to CH2 CH3 4 El3
36. tal 2 S s on each channel 12 S s total 2 S s on each channel 14 S s total CO AI DA MM BR Ww Ny 2 S s on each channel 16 S s total Note 14 The analog inputs are configured to run continuously Each channel is sampled twice per second The maximum latency between when a sample is acquired and the temperature data is provided by the USB unit is approximately 0 5 seconds 27 USB TEMP User s Guide Specifications Digital input output Table 10 Digital input output specifications Digital type CMOS Number of I O 8 DIOO 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 Digital I O transfer rate software paced Digital input 50 port reads or single bit reads per second typ Digital output 100 port writes or single bit writes per second typ Input high voltage 2 0 V min 5 5 V absolute max Input low voltage 0 8 V max 0 5 V absolute min Output low voltage IOL 2 5 mA 0 7 V max Output high voltage IOH 2 5 mA 3 8 V min Note 15 All ground pins on the USB TEMP pins 9 19 28 38 are common and 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
37. tor sensor to the USB TEMP using a single ended configuration as shown in Figure 3 9 The USB TEMP also provides 5V and GND pins for powering the E j i TOO 3 4258308854 e 20000900000 TMP36 Figure 3 9 Semiconductor sensor measurement configuration The software outputs the measurement data as a 32 bit floating point value in either voltage or temperature 19 USB TEMP User s Guide Sensor Connections Digital I O connections You can connect up to eight digital I O lines to the screw terminals labeled DIOO to DIO7 You can configure each digital bit for either input or output All digital I O lines are pulled up to 5V with a 47 K ohm resistor default You can request the factory to configure the resistor for pull down to ground if desired 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 DIOO reads TRUE 1 If you move the switch to GND DIOO reads FALSE 0 DIOO GND La Figure 3 10 Schematic showing switch detection by digital channel DIOO Caution All ground pins on the USB TEMP pins 9 19 28 38 are common and 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 In this case thermocouples must not be connected to any c
38. ues at various temperatures for supported thermistors are shown in Table 8 26 USB TEMP User s Guide Specifications Table 8 Typical thermistor resistance specifications Temp 22520 3000 Q 5 kQ 10 KQ 30 kQ thermistor thermistor thermistor thermistor thermistor 40 C 76 KQ 101 kQ 168 kO 240 kQ Note 12 885 kQ Note 12 35 C 55 kQ 73 KQ 121 kO 179 kQ 649 KQ Note 12 30 C 40 KQ 53 kQ 88 kQ 135 kQ 481 kQ Note 12 25 C 29 KQ 39 kQ 65 kQ 103 kQ 360 KQ Note 12 20 C 22 KQ 29 KQ 49 KQ 79 kQ 271 kO Note 12 15 C 16kO 22 KQ 36 kQ 6l kQ 206 kQ Note 12 10 C 12 kQ 17 kQ 28 KQ 48 KQ 158 KQ 5 C 9 5kO 13 kQ 21 kQ 37 kQ 122 KQ 0 C 7 4 KQ 9 8 kQ 16 kQ 29 KQ 95 KQ Note 12 Resistance values greater than 180 k ohms cannot be measured by the USB TEMP in the thermistor mode The 180 k ohm resistance limit includes the total resistance across the current excitation 4 EIx pins which is the sum of the thermistor resistance and the lead resistances Note 13 For accurate three wire compensation the individual lead resistances connected to the Ix pins must be of equal value Throughput rate Table 9 Throughput rate specifications Number of Input Channels Maximum Throughput 2 Samples second 2 S s on each channel 4 S s total 2 S s on each channel 6 S s total 2 S s on each channel 8 S s total 2 S s on each channel 10 S s to
39. 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 Note 9 Resistance values greater than 660 ohms cannot be measured by the USB TEMP in the RTD mode The 660 ohm resistance limit includes the total resistance across the current excitation Ix pins which is the sum of the RTD resistance and the lead resistances Note 10 For accurate three wire compensation the individual lead resistances connected to the Ix pins must be of equal value Thermistor measurement accuracy Table 7 Thermistor measurement accuracy specifications Thermistor Temperature Range Maximum Accuracy Error C lx 10 pA 2252 Q 40 to120 C 0 05 3000 Q 40 to120 C 0 05 5000 Q 35 to120 C 0 05 10000 Q 25 to120 C 0 05 30000 Q 10 to120 C 0 05 Note 11 Error shown does not include errors of the sensor itself The sensor linearization is performed using a Steinhart Hart 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 thermistor connections Please contact your sensor supplier for details on the actual sensor error limitations Total thermistor resistance on any given channel pair must not exceed 180 k ohms Typical resistance val
40. visions of the following standards or other documents EU EMC Directive 89 336 EEC Electromagnetic Compatibility EN 61326 1997 Amendment 1 1998 Emissions Group 1 Class B EN 55011 1990 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A JEC 1000 4 2 1995 Electrostatic Discharge immunity Criteria A JEC 1000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A JEC 1000 4 8 1994 Power Frequency Magnetic Field immunity Criteria A Power line and I O tests to IEC 1000 4 4 IEC 1000 4 5 IEC 1000 4 6 and IEC 1000 4 11 were not required The device is DC powered from an I O cable which is less than three meters long Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in April 2005 Test records are outlined in Chomerics Test Report EMI4193 05 We hereby declare that the equipment specified conforms to the above Directives and Standards aR hog Carl Haapaoja Director of Quality Assurance Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdag com www mccdag com
41. you can take measurements from four sensor categories Thermocouple types J K R S T N E and B Resistance temperature detectors RTDs 2 3 or 4 wire measurements of 100 Q platinum RTDs Thermistors 2 3 or 4 wire measurements Semiconductor temperature sensors LM36 or equivalent The USB TEMP provides a 24 bit analog to digital A D converter for each pair of differential analog input channels Each pair of differential inputs constitutes a channel pair You can connect a different category of sensor to each channel pair but you can not mix categories among the channels that constitute a channel pair although it is permissible to mix thermocouple types The USB TEMP provides two integrated cold junction compensation CJC sensors for thermocouple measurements and built in current excitation sources for resistive sensor measurements An open thermocouple detection feature lets you detect a broken thermocouple An on board microprocessor automatically linearizes the measurement data according to the sensor category The USB TEMP 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 TEMP is fully software calibrated 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 H gt
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