USB-TC-AI
Thermocouple and Voltage Measurement
Document Revision 4 March 2013 © Copyright 2013
User's Guide
Distributed by MicroDAQ.com, Ltd. www.MicroDAQ.com (603) 746-5524
Page 1: ...USB TC AI Thermocouple and Voltage Measurement Document Revision 4 March 2013 Copyright 2013 User s Guide Distributed by MicroDAQ com Ltd www MicroDAQ com 603 746 5524 ...
Page 2: ...ieu 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 ...
Page 3: ... Calibrating the hardware 9 Chapter 3 Signal I O Connections 10 Screw terminal pinout 10 Voltage input 10 Thermocouple input 11 CJC sensor 11 Digital I O 11 Counter input 11 Power output 11 Ground 11 Thermocouple connections 11 Wiring configuration 11 Digital I O connections 12 Chapter 4 Functional Details 13 Thermocouple measurements 13 Cold junction compensation CJC 13 Data linearization 13 Open...
Page 4: ...x V3x 18 Analog input calibration 19 Throughput rate 19 Digital I O 19 Temperature alarms 20 Counter 20 Memory 20 Microcontroller 21 USB 5V voltage 21 Power 21 USB specifications 21 Environmental 21 Mechanical 22 Screw terminal connector 22 Declaration of Conformity 23 Distributed by MicroDAQ com Ltd www MicroDAQ com 603 746 5524 ...
Page 5: ...our 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 mccdaq com You can also contact Measurement Computing Co...
Page 6: ...utput 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 brok...
Page 7: ...upts 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...
Page 8: ...onal 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 mccdaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware To connect the USB TC AI to...
Page 9: ... 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 u...
Page 10: ...voltage channels V0H V0L 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 di...
Page 11: ...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 Gr...
Page 12: ... connect up to eight digital I O lines to the screw terminals labeled DIO0 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 kΩ 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 ...
Page 13: ...sor measures 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...
Page 14: ...nsError 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 5...
Page 15: ... user Single ended Vx_H inputs are connected directly to their screw terminal pins Vx_L inputs 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 T0x T3x 0 080 V Voltage V0x to V3x 10 V ...
Page 16: ...3x Single ended 4 single ended channels Note 1 Internally the USB TC AI has four dual channel fully differential A Ds providing a total of eight input channels Note 2 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...
Page 17: ...tem 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 sup...
Page 18: ...bled mode or connected to GND Table 6 Accuracy components All values are Range Gain error of reading Offset error µV INL error of range Gain Temperature Coefficient ppm C Offset Temperature Coefficient µV 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...
Page 19: ...tely 0 4 seconds Digital I O Table 11 Digital input output specifications Parameter Specification Digital type 5V CMOS Number of I O 8 DIO0 through DIO7 Configuration Independently configured for input or output Power on reset is input mode Pull up pull down configuration All pins pulled up to 5 V via 47 K resistors default Contact MCC factory for pull down to ground GND capability Digital I O tra...
Page 20: ... 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 pac...
Page 21: ...ent terminal block pin 21 Bus powered and connected to a self powered hub Note 14 5 mA max 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 po...
Page 22: ...voltage input 7 T1H T1 sensor input 33 GND Ground 8 T1L T1 sensor input 34 V1L V1 voltage input 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 V0L V0 voltage input 12 NC No connection 38 V0H V0 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...
Page 23: ...1 Radiated and Conducted emissions Immunity EN61326 Annex A IEC 61000 4 2 1995 Electrostatic Discharge immunity Criteria C IEC 61000 4 3 1995 Radiated Electromagnetic Field immunity Criteria A IEC 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 ...
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