USB-TC-AI User`s Guide - Measurement Computing
Contents
1. Sensor Sensor temperature Accuracy error Accuracy error Tempco Type range C maximum C Typical C C C J 210 2 028 0 707 0 031 0 0 835 0 278 1200 0 783 0 288 K 210 2 137 0 762 0 035 0 0 842 0 280 1372 0 931 0 389 S 50 1 225 0 435 0 021 250 0 554 0 195 1768 0 480 0 157 R 50 1 301 0 458 0 019 250 0 549 0 190 1768 0 400 0 134 B 250 2 193 2 185 0 001 700 0 822 0 819 1820 0 469 0 468 E 200 1 976 0 684 0 030 0 0 954 0 321 1000 0 653 0 240 T 200 2 082 0 744 0 035 0 0 870 0 290 400 0 568 0 208 N 200 2 197 0 760 0 028 0 0 848 0 283 1300 0 653 0 245 Note 5 Thermocouple measurement accuracy specifications include polynomial linearization cold junction compensation and system noise These specs are for one year or 3000 operating hours whichever comes first and for operation of the USB TC AI between 15 C and 35 C There is a CJC sensor on the temperature sensor input 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 Contact your thermocouple supplier for details on the actual thermocouple accuracy error Note 6 Thermocouples must be connected to the USB TC AI such that they are floating with respect to GND The USB TC AI GND pins are isolated from earth ground You can connect thermocouple sensors to voltages referenced t2. 9 GND Ground 35 V1H V1 voltage input 10 RSVD Reserved Do Not Use 36 GND CJC sensor 11 RSVD Reserved Do Not Use 37 VOL VO voltage input 12 NC No connection 38 VOH VO voltage input 13 T2H T2 sensor input 39 GND Ground 14 T2L T2 sensor input 40 CTR Counter Input 15 NC No connection 41 DIO7 DIO channel 7 16 RSVD Reserved Do Not Use 42 DIO6 DIO channel 6 17 T3H T3 sensor input 43 DIO5 DIO channel 5 18 T3L T3 sensor input 44 DIO4 DIO channel 4 19 GND Ground 45 DIO3 DIO channel 3 20 RSVD Reserved Do Not Use 46 DIO2 DIO channel 2 21 5V 5V output 47 DIO1 DIO channel 1 22 GND Ground 48 DIOO DIO channel 0 23 NC No connection 49 GND Ground 24 NC No connection 50 NC No connection 25 NC No connection 51 NC No connection 26 NC No connection 52 NC No connection 22 CE 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 TC AI EU EMC Directive 89 336 EEC Electromagnetic Compatibility EN 61326 1997 Amendment 1 1998 Emissions Group 1 Class A EN 55011 1990 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A JEC 61000 4 2 1995 Electrostatic Discharge immunity Criteria C JEC 61000 4 3 1995 Radiated Elec
3. No connection Reserved do not use T3 sensor input T3 sensor input Ground Reserved do not use Power output Ground No connection No connection No connection No connection RSvD 1 9 98 GND NC 2 MO 8 V3L TH 39 S V3H TL 4 9 8 GND NC 5 3 S V2L RsvD 6 O S V2H T1H 7 98 98 GND TL 8 S S VIL GND 9 V1H Rrsvo 10 HO S GND CJC sensor _ RSVD 11 16 9 VOL NC 12 186 8 VOH T2H 13 18 8 GND T2 14 Mo 8 CTR NC 15 1 98 8 DIO7 RSVD 16119 8 DIO6 T3H 17W 8 DIO5 T3L 18 19 8 DIO4 GND 19 19 98 DIO3 RSVD 20119 8 DIO2 5v 24a 19 8 DIO1 GND 22 19 8 DIOO Nc 23119 8 GND Nc 24 MO S NC Nc 25 19 S NC NC 26 98 8 NC Figure 2 USB TC AI screw terminal pin numbers Use 16 AWG to 30 AWG wire for your signal connections Chapter 3 Ground V3 voltage input V3 voltage input Ground V2 voltage input V2 voltage input Ground V1 voltage input V1 voltage input Ground VO voltage input VO voltage input Ground Counter input DIO channel 7 DIO channel 6 DIO channel 5 DIO channel 4 DIO channel 3 DIO channel 2 DIO channel 1 DIO channel 0 Ground No connection No connection No connection 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 Voltage input You can connect up to four voltage inputs to the
4. 5 ppm C max Long term stability 30 ppm 1000 h Throughput rate Table 10 Throughput rate specifications Number of Input Channels Maximum throughput 2 S s 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 total 2 S s on each channel 12 S s total 2 S s on each channel 14 S s total COPIA NM BR wWL dN e 2 S s on each channel 16 S s total Note 11 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 voltage temperature data is provided by the USB unit is approximately 0 4 seconds Digital I O Table 11 Digital input output specifications Parameter Specification Digital type 5V 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 Contact MCC factory for pull down to ground GND capability 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
5. and ground The absolute maximum input voltage between an analog input and the isolated GND pins is 25 VDC when the USB TC AI is powered on and 40 VDC when the USB TC AI 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 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 KQ 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 TC AI digital I O terminals to detect the state of a TTL compatible device Refer to the schematic shown in Figure 4 If you set the switch to the 5V input DIOO reads TRUE 1 If you move the switch to GND DIOO reads FALSE 0 f GND 5V Figure 4 Schematic showing switch detection by digital channel DIOO All ground pins on the USB TC AI pins 9 19 22 27 30 33 36 39 49 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 conductive surfaces that may be referenced to earth ground For general information regarding digital
6. gt Figure 1 USB TC AI functional block diagram Screw Terminal Screw Terminal 6 USB TC AI User s Guide Introducing the USB TC AI Connecting a USB TC Al to your computer is easy Installing a data acquisition device has never been easier The USB TC AI 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 AI No third party device driver is required The USB TC AI is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the USB TC AI 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 USB 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 US
7. list price I O boards face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned 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 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 Trademark and Copyright Information Measurement Computing Corporation InstaCal Universal Library and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Refer to the Copyrights amp Trademarks section on mecdag com legal for more information about Measurement Computing trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies 2013 Measureme
8. max 0 5 V absolute min Output low voltage 0 7 V max IOL 2 5 mA max Output high voltage 3 8 V min IOH 2 5 mA max Note 12 All ground pins on the USB TC AI pins 9 19 22 27 30 33 36 39 49 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 conductive surfaces that may be referenced to earth ground 19 USB TC AI User s Guide Specifications Temperature alarms Table 12 Temperature alarm specifications Parameter Specification Number of alarms 8 one per digital I O line Alarm functionality Each alarm controls its associated digital I O line as an alarm output The input to each alarm may be any of the analog temperature input channels When an alarm is enabled its associated I O line is set to output after the device is reset and driven to the appropriate state determined by the alarm options and input temperature The alarm configurations are stored in non volatile memory and are loaded at power on Alarms will function both in data logging mode and while attached to USB Alarm input modes Alarm when input temperature gt T1 Alarm when input temperature gt T1 reset alarm when input temperature goes below T2 Alarm when input temperature lt T1 Alarm when input temperature lt
9. B connections Chapter 2 Installing the USB TC Al What comes with your shipment The following items are shipped with the USB TC AI Hardware USB TC AI USB cable 2 meter length Documentation In addition to this hardware user s guide you should also receive the Quick Start Guide This booklet provides an overview of the MCC DAQ software you received with the device and includes information about installing the software Please read this booklet completely before installing any software or hardware Unpacking As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB TC AI from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If any components are missing or damaged contact us immediately using one of the following methods Knowledgebase kb mccdag 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 mccdag com For international customers contact your local distributor Refer to the International Distributors section on our website at www mccdaq com International Installing the software Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD This booklet is available in PDF at www mccd
10. Specifications ii ee ee ete i eer eee 15 Analos Pta Rogie Rasen Ree E icant tay a es ek Tei A eae 15 Channel Conf AA coches cosh even cs Sok seses eE o na REEE aa SER EE a sd ce ehpaseshsvenstcodagssdescsbusbessbnecoet esse 16 Compatible sensors TOX toT3X oai irei iioa ee eed eae a esee nea e eea eeta beeen eieae ese iere iesaiste 16 USB TC AI User s Guide ACCULAG Ys sous faa secon sande T E Tae E EE EER ines sate AA 17 Thermocouple measurement accuracy TOx to T3X conconoccocccoconcncananancanonnonncnnn cano nanonnananonnonononnnonn cano nonennnnnncnna ra nanancuncnnanos 17 Absolute accuracy VOx V3x 18 Settling time VOX Vit ii O ceesehye 18 Analog input calibration 19 Throughput Tate sessione a o e aE E nes EE E E E taste bad E REESS 19 Digital VO a E E E en ode aa a es 19 Temperature das Bla eee N E A Be I E eh eee ee eis 20 COUET se NN 20 Me Y estat id ni 20 Microcontro lr At ds 21 USB ES VOLS dieta irrita dde ina diia ata ita 21 PO We aa a A as 21 USB Specifications e e r e r eE E Eee E ted iia 21 Environmental E n eE E aa EEE E EEES 21 Mechanical sesen a A Sided ened een Sa al Re he ee eee 22 Screw terminal CONNECOL nenn esecs Gieseaeeeocdasvantebolacesngecsshtvescyceusdvcecebubadesndepevncvbvesebunaedecocvecnelesagvpsc e 22 Declaration Of Conformity cccseccesceesseeeeseeeenseeeseaeeeseeeenseeeeesesesaaesasneeeneeeeseaesaseeeenseaeseaeseseaesasnaeeeaes 23 Preface About this User s Guide W
11. T1 reset alarm when input temperature goes above T2 Alarm when input temperature is lt T1 or gt T2 Note T1 and T2 may be independently set for each alarm Alarm output modes Disabled digital I O line may be used for normal operation Enabled active high output digital I O line goes high when alarm conditions met Enabled active low output digital I O line goes low when alarm conditions met Alarm update rate 1 second Counter Table 13 CTR I O specifications Parameter Specification Pin name CTR Number of channels 1 Resolution 32 bits Counter type Event counter Input type TTL rising edge triggered Input source CTR screw terminal Counter read writes rates software paced Counter read system dependent 33 to 1000 reads per second Counter write system dependent 33 to 1000 reads per second Schmidt trigger hysteresis 20 mV to 100 mV Input leakage current 1 0 uA typ Input frequency 1 MHz max High pulse width 500 nS min Low pulse width 500 ns min Input high voltage 4 0 V min 5 5 V absolute max Input low voltage 1 0 V max 0 5 V absolute min Note 13 All ground pins are common and are isolated from earth ground If a connection is made to earth ground with both the counter CTR and conductive thermocouples the thermocouples are no longer isolated In this case thermocouples must not be connected to any conductive surf
12. USB TC AI Thermocouple and Voltage Measurement User s Guide Document Revision 4 March 2013 Fa FA MEASUREMENT O Copyright 2013 JY p COMPUTING Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction 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 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 Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Program Any Measurement Computing product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current
13. V3x AD42_321 Dual 24 bit Sigma Delta Number of channels Voltage input VOx V3x 4 differential 4 single ended Temperature input TOx T3x 4 differential Input isolation 500 VDC minimum between field wiring and USB interface Channel configuration TOx T3x Temperature input Software programmable to match sensor type VOx V3x Voltage input Analog input modes Power up and reset state Factory default configuration is Disabled mode Once configured each channel reverts to the mode previously set by the user Single ended Vx_H inputs are connected directly to their screw terminal pins Vx_L imputs are disconnected from their screw terminal pins and internally connected to GND Differential Vx_H and Vx_L inputs are connected directly to their screw terminal pins Tx_H and Tx_L inputs are connected directly to their screw terminal pins Input ranges Thermocouple 0 080 V TOx T3x Voltage 10 V 5 V 42 5 V 1 25 V VOx to V3x software selectable Absolute max input voltage TOx to T3x relative to GND 25 V max power on 40 V max power off VOx to V3x relative to GND 25 V max power on 15 V max power off thermocouple detect enabled Input impedance TOx to T3x 5 GQ power on IMQ power off VOx to V3x 10 GQ power on 2 49 kQ power off Input leakage current TOx to T3x with open 30 nA max thermocouple detect disabled TOx T3x with op
14. aces that may be referenced to earth ground Memory Table 14 Memory specifications Parameter Specification EEPROM 1 024 bytes isolated micro reserved for sensor configuration 256 bytes USB micro for external application use 20 USB TC AI User s Guide Specifications Microcontroller Table 15 Microcontroller specifications Parameter Specification Type Two high performance 8 bit RISC microcontrollers USB 5V voltage Table 16 USB 5V voltage specifications Parameter Specification USB 5V VBUS input voltage range 4 75 V min to 5 25 V max Power Table 17 Power specifications Parameter Conditions Specification Supply current USB enumeration lt 100 mA Supply current Continuous mode with all inputs configured for 270 mA typ Note 14 Disabled mode User 5V output voltage range 4 9 V min to 5 1 V max terminal block pin 21 User 5V output current Bus powered and connected to a self powered hub 5 mA max terminal block pin 21 Note 14 Isolation Measurement system to PC 500 VDC min Note 14 This is the total current requirement for the USB TC AI which includes up to 10 mA for the status LED USB specifications Table 18 USB specifications Parameter Specification USB device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 Device power capability Self powered USB ca
15. ag com PDFmanuals DAQ S oftware Quick Start pdf Installing the hardware To connect the USB TC AI 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 TC AI When you connect the USB TC AI for the first time a notification message opens as the USB TC AI is detected When this message closes the installation is complete The upper LED Activity blinks when initially connected and then stays on The lower LED USB turns on to indicate that communication is established between the device and computer If the LED turns off If the LED is on but then turns off the computer has lost communication with the USB TC AI 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 USB TC AI User s Guide Installing the USB TC AI Configuring the hardware All hardware configuration options on the USB TC AI are programmable with software Use InstaCal to set the thermocouple type for each channel pair Use InstaCal to set the thermocouple type for each for each pair of temperature channels and the range and input configuration of each voltage channel Any channel you don t intend to use should be left disabled Configuration options are stored on the USB TC AI s isolated
16. ble type min 28 AWG D D A B cable UL type AWM 2725 or equivalent min 24 AWG VBUS GND USB cable length 3 meters max Environmental Table 19 Environmental specifications Parameter Specification Operating temperature range 0 C to 55 C max Storage temperature range 40 C to 85 C max Humidity 0 to 90 non condensing max 21 USB TC AI User s Guide Specifications Mechanical Table 20 Mechanical specifications Parameter Specification Dimensions L x W x H 128 52 x 88 39 x 35 56 mm 5 06 x 3 48 x 1 43 ft User connection length 3 m 9 84 ft max Screw terminal connector Table 21 Screw terminal connector specifications Parameter Specification Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Table 22 Screw terminal pinout Pin Signal Name Pin Description Pin Signal Name Pin Description 1 RSVD Reserved Do Not Use 27 GND Ground 2 NC No connection 28 V3L V3 voltage input 3 TOH TO sensor input 29 V3H V3 voltage input 4 TOL TO sensor input 30 GND Ground 5 NC No connection 31 V2L V2 voltage input 6 RSVD Reserved Do Not Use 32 V2H V2 voltage input 7 T1H T1 sensor input 33 GND Ground 8 TiL T1 sensor input 34 VIL V1 voltage input
17. e Functional Details External components The USB TC AI has the following external components as shown in Figure 5 1 Screw terminal pins 1 to 26 3 LEDs Activity top and Power bottom 2 Screw terminal pins 27 to52 4 USB connector Figure 5 External component locations Screw terminals The screw terminals provide connections for thermocouples voltage input digital I O ground and power output Refer to the Signal I O ConnectionsError Reference source not found chapter beginning on page 10 for screw terminal descriptions USB connector The USB connector provides 5V power and communication No external power supply is required LEDs USB TC AI has two LEDs Activity and Power The Activity LED top blinks when data is transferred The Power LED bottom turns on when the device is receiving power from the USB cable Power The two 5V terminals are isolated 500 VDC from the USB 5V Caution Each 5V terminal is an output Do not connect to an external power supply or you may damage the USB TC AI and possibly the computer 14 Specifications Typical for 25 C unless otherwise specified All specifications apply to all temperature and voltage input channels unless otherwise specified Specifications in talic text are guaranteed by design Analog input Chapter 5 Table 1 Generic analog input specifications Parameter Conditions Specification A D converter type TOx T3x VOx
18. easures the average temperature at the terminal block 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 TC AI is equipped with 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 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 13 USB TC AI User s Guid
19. en 105 nA max VOx to V3x 1 5 nA typ 25 nA max signal common mode Input bandwidth TOx to T3x 50 Hz 3 dB VOx to V3x 3 kHz Maximum working voltage VOx to V3x 10 25 V max 15 USB TC AI User s Guide Specifications Parameter Conditions Specification Common mode rejection ratio TOx to T3x fIN 60 Hz 100 dB VOx to V3x FIN 60 Hz all 83 dB input ranges ADC resolution 24 bits ADC No missing codes 24 bits Input coupling DC Warm up time 30 minutes min Open thermocouple detect TOx to T3x Automatically enabled when the channel pair is configured for thermocouple sensor The max open detection time is 3 seconds CJC sensor accuracy TOx to T3x 15 C to 35 C TOx to T3x 0 C to 70 C 0 25 C typ 0 5 C max 1 0 to 0 75 C max Channel configurations Table 2 Channel configuration specifications Channel Category Conditions Specification TOx to T3x Disabled All temperature input channels are disconnected from screw See Note 4 terminals and internally connected to GND TOx to T3x Thermocouple 4 differential channels Note 1 VOx to V3x Disabled All voltage input channels are disconnected from screw See Note 4 terminals and internally connected to GND VOx to V3x Differential 4 differential channels Note 2 VOx to V3x Single ended 4 single ended channels Note 1 Internally
20. ensor measures the ambient temperature at the terminal block so that the cold junction voltage can be calculated Digital I O 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 Counter input The CTR terminal is the input to the 32 bit event counter The internal counter increments when the TTL level transitions from low to high The counter can count events at frequencies of up to 1 MHz Caution All ground pins on the USB TC AI pins 9 19 22 27 30 33 36 39 49 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 conductive surfaces that may be referenced to earth ground Power output The two 5V output terminals are isolated 500 VDC from the USB 5V Caution Each 5V terminal is an output Do not connect to an external power supply or you may damage the USB TC AI and possibly the computer Ground The six analog ground terminals GND provide a common ground for the input channels and DIO bits and are isolated 500 VDC from the USB GND 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 tempera
21. ge Gain error Offset error INL error Gain Temperature Offset Temperature of reading uV of range Coefficient Coefficient ppm C HV C 10 V 0 0246 16 75 0 0015 3 68 0 42 5 V 0 0246 16 75 0 0015 3 68 0 42 2 5 V 0 0246 16 75 0 0015 3 68 0 42 1 25 V 0 0246 16 75 0 0015 3 68 0 42 Table 7 Noise performance specifications Range Peak to peak noise RMS noise Noise Free resolution uV Vrms bits 10 V 41 13 6 23 19 09 5 V 30 85 4 67 18 51 2 5 V 17 14 2 60 18 36 1 25 V 11 14 1 69 17 98 Table 7 summarizes the noise performance for the USB TC AI Noise distribution is determined by gathering 1000 samples with inputs tied to ground at the user connector Samples are gathered at the maximum specified sample rate of 2 S s Settling time VOx V3x Table 8 Settling time specifications Range Accuracy 0 0004 seconds 10 V 15 0 5 V 0 40 2 5 V 0 40 1 25 V 0 40 Settling time is defined as the time required for a channel to settle within a specified accuracy in response to a full scale FS step input 18 USB TC AI User s Guide Specifications Analog input calibration Table 9 Analog input calibration specifications Parameter Specification Recommended warm up time 30 minutes min Calibration Firmware calibration Calibration interval 1 year Calibration reference 10 000 V 5 mV max Actual measured values stored in EEPROM Tempco
22. hat you will learn from this user s guide This user s guide describes the Measurement Computing USB TC AI 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 AI hardware is available on our website at www mccdag com You can also contact Measurement Computing Corporation with specific questions Knowledgebase kb mccdag com Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupportmccdag com Chapter 1 Introducing the USB TC Al The USB TC AT is a USB 2 0 full speed thermocouple input module that is supported under popular Microsoft Windows operating systems The USB TC Al is fully compatible with both USB 1 1 and USB 2 0 ports The USB TC AI provides eight analog input channels that are configured as four differential temperature input
23. microcontroller in EEPROM which is non volatile memory on the USB TC AI module Configuration options are loaded on power up The factory default configuration is Type J thermocouple Default configuration The factory default configuration for the voltage inputs is Disabled The Disabled mode disconnects the analog inputs from the terminal blocks and internally grounds all of the A D inputs Warm up Allow the USB TC AI to warm up for 30 minutes after powering up before taking measurements This warm up time minimizes thermal drift and achieves the specified rated accuracy of measurements Calibrating the hardware The USB TC AI is fully calibrated via InstaCal Allow the USB TC AI to operate for at least 30 minutes before calibrating This warm up time minimizes thermal drift and achieves the specified rated accuracy of measurements Signal I O Connections Screw terminal pinout The USB TC AI 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 screw terminals 10 and 11 is the integrated CJC sensor used for thermocouple measurements Signals are identified in Figure 2 Reserved do not use No connection TO sensor input TO sensor input No connection Reserved do not use T1 sensor input T1 sensor input Ground Reserved do not use Reserved do not use No connection T2 sensor input T2 sensor input
24. nt 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 written consent from Measurement Computing Corporation Life support devices systems are devices or systems that 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 HM USB TC Al docx 2 Table of Contents Preface About this User s Guide oonnnnicnnonninacnnancananann narran 5 What you will learn from this user s guide ooooooonnnnnccnocnnonoconoconocononononnnonnconn nono nono nnnn none cn nono nono nero conocio nn nrncrnnnnnnons 5 Conventions in this user s Guide oo elec enose eeaeee a ee EE Ee r EE EESE EEN naar nen none EEI eE RETEK iee 5 Where to find more information 0 eee eee ese cseeeeeeeeeeeeeeeeeesecesecsecsaecsaecsaecs
25. o earth ground as long as the isolation between the GND pins and earth ground is maintained Note 7 When thermocouples are attached to conductive surfaces the voltage differential between multiple thermocouples must remain within 1 4 V For best results we recommend using insulated or ungrounded thermocouples when possible 17 USB TC AI User s Guide Specifications Absolute accuracy VOx V3x Table 5 Calibrated absolute accuracy specifications Range Absolute Accuracy mV 10 V 2 779 5 V 1 398 2 5 V 0 707 1 25 V 0 362 Note 8 When connecting differential inputs to floating input sources the user must provide a ground return Note 9 Note 10 path from each differential input to ground To do this simply connect a resistor from each of the differential inputs to GND A value of approximately 1Meg ohm can be used for most applications All ground pins are common and are isolated from earth ground If a connection is made to earth ground when using both voltage inputs and conductive thermocouples the thermocouples are no longer isolated In this case thermocouples must not be connected to any conductive surfaces that may be referenced to earth ground Unused voltage inputs should not be left floating These inputs should be placed in the Disabled mode or connected to GND Table 6 Accuracy components All values are Ran
26. s and four differential or single ended voltage inputs A 24 bit analog to digital A D converter is provided for each pair of analog inputs 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 The temperature channels are software programmable for different thermocouple types You can take measurements from type J K R S T N E and B thermocouples The voltage input range is software programmable for 10 V 5 V 2 5 V 1 25 V The USB TC AI provides a integrated cold junction compensation CJC sensor 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 AI 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 ATI is fully software calibrated Functional block diagram USB TC AI functions are illustrated in the block diagram shown here 5V DIO 24 bit A D PD eee Mi trol Isolator Micro 24 bit A D icrocontroller 12 13 gt Isolated 5V DC DC 500 V Isolation Barrier Temp sensor 12 12 Event Counter 1 channel 32 bit CJC TO T3 24 bit A D a
27. signal connections and digital I O techniques refer to the Guide to Signal Connections available on our web site at www mccdaq com signals signals pdf 12 Captor 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 AI 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 TC AI in a floating fashion Do not attempt to connect the thermocouple low side CAL 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 TC AI terminal blocks produce two additional thermocouple junctions 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 TC AI subtracts the cold junction voltage from the thermocouple voltage The USB TC AI has one high resolution temperature sensor integrated into the design The CJC sensor m
28. the USB TC AI has four dual channel fully differential A Ds providing a total of eight Note 2 Note 3 Note 4 input channels When connecting differential inputs to floating input sources you must provide a DC return path from each differential input to ground To do this connect a resistor from each of the differential inputs to GND A value of approximately 1Meg ohm can be used for most applications Channel configuration information is stored in the EEPROM of the isolated microcontroller 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 temperature and voltage inputs from the terminal blocks and internally connect ground GND to all of the A D inputs Compatible sensors TOx toT3x Table 3 Compatible sensor type specifications Parameter Conditions C Thermocouple J 210 to 1200 K 270 to 1372 R 50 to 1768 S 50 to 1768 T 270 to 400 N 270 to 1300 E 270 to 1000 B 0 to 1820 16 USB TC AI User s Guide Specifications Accuracy Thermocouple measurement accuracy TOx to T3x Table 4 Thermocouple accuracy specifications including CJC measurement error All specifications are
29. tromagnetic Field immunity Criteria A JEC 61000 4 8 1994 Power frequency magnetic field immunity Criteria A Declaration of Conformity based on tests conducted by Chomerics Test Services Woburn MA 01801 USA in July 2007 Test records are outlined in Chomerics Test Report EMI4833 07 We hereby declare that the equipment specified conforms to the above Directives and Standards 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
30. ture The USB TC AI 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 thermocouple 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 on one or more sensor input channels to connect the thermocouple Wiring configuration Connect the thermocouple to the USB TC AI using a differential configuration as shown in Figure 3 11 USB TC AI User s Guide Signal I O Connections RSVD O Z T H O T L RSVD T H T L GND RSVD O Zz VY Figure 3 Typical thermocouple connection Connect thermocouples to the USB TC AI such that they are floating with respect to GND pins 9 19 28 38 The USB TC AI 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 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
31. uecsaecseseseseaeseaeeeeessesaeesaeeasenaeenaes 5 Chapter 1 Introducing the USB TC AL cssecsssesseeeeseeeeeseeeesaesesneeenseeeeneeeesaaesaseeeenenaeseaeseseaesnseaeeeseseseaesaseeeenseas 6 Functional block diapraMccociop licitante Coa E os EKA EEEE E cp subs lacuudeeveck sududecuseunabes EEE Ees 6 Connecting a USB TC AI to your computer is easy 0 ee eeceecesecesecssecesecaeecaeecseeeseseeeseseseeeseenseeaecsasenaeenaes 7 Chapter 2 Installing the USB T C Al ooo dia ria id da Aro LAA di 8 What comes ISI 8 Hardware Documentation Unpaid aleta Installing the software Installing the hardware Configuring the Dard A NN 9 Calibrating the hard Waite siso eei ee ia I IS r OEE AIS PERT E EEEE E NO ys Er PITTS EKER RES iE 9 Chapter 3 Signal VO CONMCCUONS issis anassen ii 10 Screw AA nenn eeaeee re E o Er ESEVE Er sabessenscecbavescscaveecsesasuadeduase cuba eves Voltage input Thermocouple input CIC sensor Digital VO 4 ttt ceo ath atte he eM Se hd We et eee eh ee he kl hale ad be Te Coumiter Plinio ew es Ge eens Power output NN NO Thermocouple connections Wiring configuration Digital I O connections Chapter 4 Functional Details E E E A eee eee Thermocouple measure Mets aan As Cold junction compensation CJC Data linearization 0 0 eee eeeereeteeeee Open thermocouple detection OTD External COMPONEN Si cdas SETE WENA A A E AA AA A USB connector Chapter 5
32. voltage channels VOH VOL to V3H V3L The input range is software programmable for 10 V 5 V 2 5 V or 1 25 V Each voltage channel is software configurable for differential or single ended mode When connecting differential inputs to floating input sources you must provide a DC return path from each differential input to ground One way to do this is to connect a resistor from one side of each of the differential inputs to GND A value of approximately 100 kQ can be used for most applications Caution All ground pins on the USB TC AI pins 9 19 22 27 30 33 36 39 49 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 conductive surfaces that may be referenced to earth ground 10 USB TC AI User s Guide Signal I O Connections Thermocouple input You can connect up to four thermocouples to the differential sensor inputs TOH TOL to T3H T3L The device supports type J K R S T N E and B thermocouples You can mix thermocouple types 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 CJC sensor The USB TC AI has one built in high resolution temperature sensor The CJC s
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