Omega Engineering 8 Channel Thermocouple USB Data Acquisition Module... Bedienungsanleitung
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User’s Guide
TC-08
8 Channel Thermocouple
USB Data Acquisition Module
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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.
I
Contents
Contents
.....................................................................................................................................11 Introduction
...........................................................................................................................................1
1 Overview
...........................................................................................................................................1
2 Installing the driver
...........................................................................................................................................1
3 Connecting the USB TC-08
...........................................................................................................................................4
4 Safety warning
.....................................................................................................................................52 Product information
...........................................................................................................................................5
1 Specifications
...........................................................................................................................................6
2 How a thermocouple works
.....................................................................................................................................73 Technical reference
...........................................................................................................................................7
1 Introduction
...........................................................................................................................................7
2 Modes of operation
...........................................................................................................................................7
1 Introduction
...........................................................................................................................................8
2 Streaming mode
...........................................................................................................................................10
3 Get Single mode
...........................................................................................................................................12
4 Legacy mode
...........................................................................................................................................14
3 Driver routines
...........................................................................................................................................14
1 Introduction
...........................................................................................................................................15
2 New USB mode and legacy mode
...........................................................................................................................................29
3 New USB mode only
...........................................................................................................................................34
4 Legacy mode only
...........................................................................................................................................41
4 Programming
...........................................................................................................................................41
1 Introduction
...........................................................................................................................................41
2 C and C++
...........................................................................................................................................41
3 Delphi
...........................................................................................................................................42
4 Excel
...........................................................................................................................................42
5 LabVIEW
...........................................................................................................................................42
6 Visual Basic
...........................................................................................................................................42
7 Agilent VEE
...........................................................................................................................................43
5 Troubleshooting
...........................................................................................................................................44
6 Glossary
..............................................................................................................................................47
Index
Introduction 1
1Introduction
1.1 Overview
The USB TC-08 is a temperature and voltage logger designed to support multiple
thermocouples. With the accompanying TC-08 software, the unit can be used with any
laptop or PC running Windows XP SP2 or Vista. If you are technically-minded and
want to tailor the product to a particular application, you can write your own programs
with the supplied driver.
The driver provides cold junction compensation for thermocouples. The TC-08
software supports up to 20 USB TC-08 devices and the driver can support more (as
many as 64, if you have a high-specification PC).
This manual describes the physical and electrical properties of the USB TC-08, and
provides an explanation of how to use the software drivers. For information on the
USB TC-08 software, please consult the software help file.
1.2 Installing the driver
The driver is installed automatically when you install the TC-08 software.
Alternatively, you can download the driver from our website at http://www.omega.com.
1.3 Connecting the USB TC-08
Please note: do not connect the USB TC-08 until you have installed the
software and restarted your PC.
To begin using the USB TC-08, connect it to the USB port on your computer using the
cable provided. Next, connect a thermocouple to one of the thermocouple input
connectors. To complete the installation, select the USB TC-08 unit and thermocouple
type in the TC-08 software as follows:
1. Start up the TC-08 Recorder
2. Select New Settings from the File menu.
The Recording dialog box appears:
3. Click the OK button.
The Sampling Rate dialog box appears
TC-08 User's Guide2
4. Click the OK button.
The Converter details dialog box appears
5. Select USB TC-08 from the drop-down list of converters.
The device name and serial number should appear in the USB Devices pane and
the USB enumeration progress bar gradually expand to 100%. If the progress bar
does not start moving, disconnect and reconnect the USB TC-08, then click
Refresh.
6. In the USB Devices pane, select the USB TC-08. If you are using more than one
USB TC-08, check the serial number on the bottom of the device so that you know
which one to select from the list
7. Click the OK button.
The following dialog box appears
Introduction 3
8. In the TC-08 Channels window, double-click on Channel 1 unused.
The Edit TC-08 Channel dialog box appears
9. From the Thermocouple drop-down list, select the type of thermocouple you are
using and click OK.
The TC-08 Channels dialog box reappears.
10. Click OK.
Channel 1 should now appear in the monitor window with the current temperature
reading.
TC-08 User's Guide4
1.4 Safety warning
We strongly recommend that you read the general safety information below before
using your product for the first time. If the equipment is not used in the manner
specified, then the protection provided may be impaired. This could result in damage
to your computer and/or injury to yourself or others.
Maximum input range
The USB TC-08 is designed to measure voltages in the range of ±70 mV. Any voltages
in excess of ±30 V may cause permanent damage to the unit.
Mains voltages
These products are not designed for use with mains voltages.
Safety grounding
The ground of every product is connected directly to the ground of your computer
through the interconnecting cable provided. This is done in order to minimise
interference. If the PC (especially laptop) is not grounded, reading stability cannot be
guaranteed and it may be necessary to manually ground the equipment.
Take care to avoid connecting the inputs of the product to anything which may be at a
hazardous voltage. If in doubt, use a meter to check that there is no hazardous AC or
DC voltage. Failure to check may cause damage to the product and/or computer and
could cause injury to yourself or others.
Take great care when measuring temperatures near mains equipment. If a sensor is
accidentally connected to mains voltages, you risk damage to the converter or your
computer and your computer chassis may become live.
You should assume that the product does not have a protective safety earth. Incorrect
configuration or use of the device to measure voltages outside the maximum input
range can be hazardous.
Repairs
The unit contains no user-serviceable parts: repair or calibration of the unit requires
specialised test equipment and must be performed by Omega Engineering.
Product information 5
2Product information
2.1 Specifications
Resolution
20 bits (16.25 NFR)
Thermocouple types
B,E,J,K,N,R,S,T
Number of input channels
8
Conversion time - per active channel
100 ms
Conversion time - CJC
100 ms
Uncalibrated accuracy
The sum of ±0.2% and ±0.5°C
Full scale input
±70 mV
Common mode range
±7.5 V
Overvoltage protection
±30 V
Input impedance
2 MW
Input connectors
8 x miniature thermocouple
Output connector
USB upstream connector
Power requirements
No power supply required
Environmental conditions
0 to 50°C, 25% to 75% humidity
Quoted accuracy over 20 - 30°C
NOT water-resistant
Note: The resolution and accuracy depend upon the thermocouple type and the
temperature range. Below is a list of the thermocouples and temperature ranges
supported by the USB TC-08.
Actual measurable range
Theoretical ranges
CJC
-5°C to 70°C
N/A
Type B
20°C to 1820°C (CJC must be
>20°C)
0°C to 1820°C
Type E
-270°C to 910°C
-270°C to 1000°C
Type J
-210°C to 1200°C
-210°C to 1200°C
Type K
-270°C to 1370°C
-270°C to 1370°C
Type N
-270°C to 1300°C
-270°C to 1300°C
Type R
-50°C to 1760°C
-50°C to 1760°C
Type S
-50°C to 1760°C
-50°C to 1760°C
Type T
-270°C to 400°C
-270°C to 400°C
TC-08 User's Guide6
2.2 How a thermocouple works
In a closed circuit of two dissimilar metals (a thermocouple), an electric current flows
when one of the two junctions is heated with respect to the other. The current
continues to flow as long as the two junctions are at different temperatures. The
magnitude and direction of the current is a function of the temperature difference
between the junctions and of the thermal properties of the metals used in the circuit.
This phenomenon is known as the Seebeck Effect.
The conductors can be made of any two dissimilar metals, and when the hot junction
is heated the current flow can be observed. If the positions of the hot and cold
junctions are reversed, current flows in the opposite direction.
A thermocouple circuit actually generates a measurable, low-voltage output that is
almost directly proportional to the temperature difference between the hot junction
and the cold junction. A change in this temperature difference produces some net
change in the voltage.
Note: More information on choosing and using thermocouples can be found at
www.omega.com.
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