Keithley DAS-TC User Manual
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Keithley DAS-TC User Manual

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  • Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Visit our website - Click HERE...
  • Page 2 DAS-TC/B User’s Guide A G R E A T E R M E A S U R E O F C O N F I D E N C E...
  • Page 3 Hardware Keithley Instruments, Inc. warrants that, for a period of one (1) year from the date of shipment (3 years for Models 2000, 2001, 2002, 2010 and 2700), the Keithley Hardware product will be free from defects in materials or workmanship. This warranty will be honored provided the defect has not been caused by use of the Keithley Hardware not in accordance with the instructions for the product.
  • Page 4 EXCEPT FOR THE EXPRESS WARRANTIES ABOVE KEITHLEY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANT- ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEITHLEY DISCLAIMS ALL WARRANTIES WITH RESPECT TO THE OTHER HARDWARE AND OTHER SOFTWARE.
  • Page 5 DAS-TC/B User’s Guide Revision C - June 2002 Part Number: 95630...
  • Page 6 However, Keithley Instruments assumes no responsibility for the use of such information nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent rights of Keithley Instruments.
  • Page 7 Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most mea- surement, control, and data I/O signals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high transient over-voltages.
  • Page 8 (Note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability of a replacement component, call a Keithley Instruments office for information.

  • Page 9: Table Of Contents

    Table of Contents Preface Overview Features ..........1-1 Supporting Software .
  • Page 10 Starting the DAS-TC/B Data Logger..... . 5-2 Using the DAS-TC/B Data Logger ..... . . 5-2...
  • Page 11 Attaching an STA-TC/B to a DAS-TC/B ..4-7 Figure 4-6. DAS-TC/B Inputs ......4-8 Figure 4-7.
  • Page 12 List of Tables Table 7-1. Troubleshooting Information....7-1 Table A-1. Analog Input Specifications ....A-1 Table A-2.

  • Page 13: Preface

    Preface The DAS-TC/B User’s Guide contains information and instructions for handling and using a DAS-TC/B thermocouple/voltage measuring board. To follow the information and instructions contained in this manual, you must be familiar with data-acquisition principles, with your application, ® and with the Windows 95/98/NT operating system and compatible computers.
  • Page 14 • Appendix A contains specifications. • Appendix B contains pin assignments for the main I/O connector. • Appendix C contains CE mark certification. • The index provides hyperlinks, as well as written page numbers, to locate various subjects in the manual.

  • Page 15: Overview

    Automatic CJC (cold-junction compensation) is performed on a per-channel-basis and is continuous. Calibration of the CJC and board logging parameters is automatic and continuous. Inputs to the DAS-TC/B enter through either a plug-in screw-terminal block (the STC-TC/B) or an external screw-terminal box (the STA-TC/B). Features...

  • Page 16: Supporting Software

    Supporting Software Available software allows you to take two different approaches to configuring and running your DAS-TC/B board. You can use a fully integrated data acquisition software package (TestPoint or LabVIEW) or write a custom program in Visual C/C++, Visual Basic, or Delphi using DriverLINX (included with the hardware).

  • Page 17: Testpoint

    tasks to perform data acquisition. The software includes memory and data buffer management, event triggering, extensive error checking, and context sensitive online help. More specifically, DriverLINX provides application developers a standardized interface to over 100 services for creating foreground and background tasks for the following: Analog input and output Digital input and output...

  • Page 18: Labview

    STC-TC/B — a panel containing a CJC sensor and screw terminals for all DAS-TC/B I/O connections. The STC-TC/B plugs directly into the main I/O connector of the DAS-TC/B and extends from the rear of the computer. STA-TC/B — contains a CJC sensor and screw terminals for all DAS-TC/B I/O connections.

  • Page 19: Functional Description

    Functional Description This section describes the operating features of the DAS-TC/B. The DAS-TC/B consists of two sections: the isolated input section and the control section. The isolated input section handles the measurement functions, while the control section handles data processing. Figure 2-1 is...
  • Page 20 Functional Description...

  • Page 21: Control Section

    The isolated input section consists of a 16-channel input multiplexer, a CJC sensor input, calibration inputs, a programmable gain amplifier, and a V/F (voltage-to-frequency) converter. During operation, the DAS-TC/B constantly monitors and uses the CJC input to maintain the accuracy of the board.

  • Page 22: Operational Flow

    During DAS-TC/B initialization, the CPU downloads configuration infor- mation from the computer hard drive to the DAS-TC/B board memory. The CPU then sets up the DAS-TC/B board and channel parameters to the specified values. Following parameter setup, the CPU performs a calibra- tion and stores the gain and offset coefficients in board memory.
  • Page 23 As soon as all readings and conversions are complete, the DAS-TC/B requests an interrupt and transfers all measurements to the computer. The DAS-TC/B makes periodic measurements of the CJC and performs self-calibration as a background task.

  • Page 24: Installation

    This section describes the following procedures, which appear in the order they are to be performed: Inventorying installation resources for the board Installing the software used to operate your DAS-TC/B board Configuring the installation in software Unpacking and inspecting the board, setting the base address of the...

  • Page 25: Installing The Software

    4. Determine whether your computer has sufficient resources for your DAS-TC/B board. 5. Determine whether your DAS-TC/B board can use your computer’s free resources. 6. If you have the needed resources, continue with the next section, “Installing the Software.” The DriverLINX Installation and Configuration Guide, Section 1, Note: amplifies the inventory process in checklist items 1-5.

  • Page 26: Installing The Labview Software And Driver

    DriverLINX support files for LabVIEW during the same session in which you install DriverLINX. Even if DriverLINX versions other than the DAS-TC/B Series version are already installed on your system, you must also install the DAS-TC/B Series DriverLINX version. In the process, some DriverLINX capabilities shared by all boards may be upgraded (test utilities, for example).

  • Page 27: Driverlinx Installation Options

    DriverLINX Installation Procedure Install the DriverLINX software components as follows: 1. Place the DriverLINX DAS-TC/B Series CD-ROM in your drive and wait a few seconds. On most systems, setup starts automatically. If not, run the setup.exe file found in the root directory of the CD-ROM.
  • Page 28 4. If you do not plan to develop custom application software for your DAS-TC/B board, then skip to step 5. If you do plan to develop custom application software, you must install DriverLINX interfaces before writing the software. Install them now by clicking Install Interfaces and following the series of on-screen instructions.
  • Page 29 Configuration. c. Under Configuration, click Hardware References. A list of documents appears. d. In the list of documents, click Keithley DAS-TC/B. Acrobat Reader opens and the manual entitled Using DriverLINX with Your Hardware—Keithley DAS-TC/B appears. e. Print the following section from the Using DriverLINX with Your Hardware—Keithley DAS-TC/B manual: “Configuring the...

  • Page 30: Configuring Your Installation

    Configuring Your Installation 1. Locate and briefly review the DriverLINX manual section, “Configuring the DAS-TC/B,” that you printed earlier during step 10 of “Installing DriverLINX Software Components and Documentation” on page 3-3. Reviewing this section will help prepare you to input information and select options when configuring your installation.

  • Page 31: Preparing And Installing Your Board

    Preparing and Installing Your Board This section describes the following: Safely unwrapping and then inspecting your board before installing it Setting the base-address DIP switch of the board Physically installing the board in your computer Ensure that the computer is turned off before installing or Caution: removing a board.

  • Page 32: Setting The Base Address

    Series manual. (You printed this information in step 10 of “Installing DriverLINX Software Components and Documentation.”) The only manually configurable component on the DAS-TC/B is the DIP switch for setting the board’s base address. Figure 3-1 shows the 7-position DIP switch with factory settings. (Note that the switches set the values shown only when in the off positions).

  • Page 33: Installing The Board

    Inserting or removing a board with the computer on can Caution: damage your board or your computer. To install a DAS-TC/B board in your computer, perform the following steps: 1. Turn off power to the computer and all attached equipment.

  • Page 34: Checking Your Installation

    7. Continue with the next section, “Checking Your Installation.” Checking Your Installation The ability to start the DriverLINX DAS-TC/B Data Logger utility, which is available only after you install DriverLINX, verifies that DriverLINX and the board are installed and configured satisfactorily. Do the following: 1.

  • Page 35: Cabling And Wiring

    DAS-TC/B: The screw terminal accessories that are needed to interface your circuits to the DAS-TC/B inputs The nature of the DAS-TC/B inputs and how this influences wiring The appropriate wiring connections for floating and grounded signals Using Screw Terminal Accessories Signal connections to the DAS-TC/B main I/O connector require using either an STC-TC/B or an STA-TC/B screw terminal accessory.

  • Page 36: Features Of Screw Terminal Accessories

    Both the STC-TC/B and STA-TC/B screw terminal accessories provide screw terminals that mate with the pins on the main I/O connector of the DAS-TC/B. (Appendix B lists the pin assignments for the DAS-TC/B main I/O connector.) They both support all sixteen differential channels of the DAS-TC/B.

  • Page 37: Figure 4-2. Sta-Tc/B Layout

    +15 +14 +13 +12 +11 +10 −15 −14 −13 −12 −11 −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 −0 B GND Chassis Figure 4-2. STA-TC/B Layout Both the STC-TC/B and STA-TC/B screw terminal accessories include a CJC temperature sensor and provide an optional switch-selectable open-thermocouple detection signal for each channel.

  • Page 38: Cold Junction Compensation (Cjc) Temperature Sensor

    (or cold junction voltage), is always generated between a thermocouple and the terminals to which the thermocouple is connected. Therefore, when you connect a thermocouple to a DAS-TC/B board via an STC-TC/B or STA-TC/B screw terminal accessory, a reference-junction voltage is generated between the thermocouple leads and the screw terminals.

  • Page 39: Open-Thermocouple Detection Signals

    Therefore, on both the STC-TC/B and STA-TC/B accessories, open-thermocouple detection signals are available to drive high-impedance (100MΩ minimum) DAS-TC/B inputs out of range during open-thermocouple events. These signals are small enough not to interfere with normal thermocouple temperature measurements. For...

  • Page 40: Ground Terminals

    STA-TC/B accessories, B GND and CHASSIS GND. Use the B GND terminals to externally connect the grounds of grounded signal sources to the analog ground of the DAS-TC/B input amplifier. The B GND terminals lead to the analog ground. Refer to “Connecting Signals”...

  • Page 41: Connecting An Stc-Tc/B

    Figure 4-5. Attaching an STA-TC/B to a DAS-TC/B Connecting Signals A short between DAS-TC/B signal inputs and AC creates a safety hazard. Warning To avoid these shorts, secure all input connections to prevent signal wires from coming loose and shorting to high voltages.

  • Page 42: Understanding The Das-Tc/B Inputs

    To attach your signals to the DAS-TC/B, use either an STC-TC/B Note: or an STA-TC/B accessory. Refer to the section “Using Screw Terminal Accessories” on page 4-1. Understanding the DAS-TC/B Inputs The input configuration of the DAS-TC/B is shown schematically in Figure 4-6.
  • Page 43 V/F converter. The multiplexer is effectively a solid-state 16-pole, double-throw switch. The entire input section of the DAS-TC/B is isolated to reject most unwanted signals from your measurements. Refer to “Isolated Input Section” on page 2-3 and see Figure 2-1. Additionally, the differential High and Low input terminals of the input amplifier reject all but a tiny...

  • Page 44: Connecting An Ungrounded Thermocouple

    It must be defined either externally by the user or internally on the data acquisition board, as follows: Your DAS-TC/B board provides 10kΩ resistance paths internally. The 10kΩ resistors are appropriate when the source resistance of the signal is low—as with thermocouples—and the signal is isolated.

  • Page 45: Figure 4-7. Connecting An Ungrounded Thermocouple

    STA-TC/B) Figure 4-7. Connecting an Ungrounded Thermocouple As discussed in “Understanding the DAS-TC/B Inputs” on page 4-8, no external connection to the B GND terminal is required; the common mode connection is provided by an internal 10kΩ resistor.

  • Page 46: Connecting A Grounded Thermocouple

    STA-TC/B) Figure 4-8. Connecting a Grounded Thermocouple This external low-resistance common-mode connection essentially overrides the internal 10kΩ resistor of the DAS-TC/B. Connect the analog ground (B GND) to the ground of the Note: grounded object. Do not connect analog ground (B GND) to the Low input connection at the board.

  • Page 47: Connecting Other Signal Sources

    Even isolated devices couple to ground through finite capacitance. Consider coupling of a 5 volt, 8MHz ISA-bus signal to the analog ground of the DAS-TC/B through a capacitance of only 1pF. This coupling can cause roughly a 200µA noise current to flow in the connection between the analog ground and the ground of the object to which the thermocouple is connected.

  • Page 48: Connecting A Grounded Signal Source

    As discussed in “Understanding the DAS-TC/B Inputs” on page 4-8, the common mode connection is provided by the internal 10kΩ resistor. Alternatively, a floating signal source can be connected as in Figure 4-10. STA-TC/B STP-TC/B Optional Shield Channel n High...

  • Page 49: Figure 4-11. Connecting A Grounded Signal Source

    A common mode connection should be made directly between the ground of the signal source and the analog ground (B GND). This low-resistance external connection essentially overrides the internal 10kΩ resistor of the DAS-TC/B. Connect the analog ground (B GND) to the ground of the Note: grounded object.

  • Page 50: The Das-Tc/B Data Logger

    The DAS-TC/B Data Logger The DAS-TC/B Data Logger is a DriverLINX utility for viewing and recording measurements from the DAS-TC/B board. It is installed automatically when you install DriverLINX. Use it initially to check out the combined DAS-TC/B and DriverLINX installations (refer to “Checking Your Installation”...

  • Page 51: Starting The Das-Tc/B Data Logger

    3. Find the DriverLINX Test Panels entry, then the DAS-TC/B Data Logger entry. 4. Click on the DAS-TC/B Data Logger entry. The initial DAS-TC/B Data Logger screen should appear. Using the DAS-TC/B Data Logger For detailed information about using the Data Logger, refer to the Help screens that are available after starting the program.

  • Page 52: Calibration

    Calibration DAS-TC/B calibration requires setting the voltage across two of the board’s test points, which are shown in Figure 6-1. The process requires a digit DVM (Digital Voltmeter) or a DMM (Digital Multimeter), such as a Keithley Instruments 196 DMM.

  • Page 53: Troubleshooting

    Troubleshooting If your DAS-TC/B is not operating properly, use the information in this section to isolate the problem. If the problem appears serious enough to warrant technical support, refer to “Technical Support” on page 7-5 for information on how to contact an applications engineer.
  • Page 54 The board configuration is Check the remaining settings in incorrect. the configuration file. The board is incorrectly aligned Check the board seating. in the accessory slot. The board is damaged. Contact Keithley for technical support; see page 7-5. Troubleshooting...

  • Page 55: Testing The Board And Host Computer

    Table 7-1, continue with the next two subsections to further isolate the problem. Testing the Board and Host Computer To isolate the problem to the DAS-TC/B board or to the host computer, use the following steps: Removing a board with the power on can cause damage to your Caution: board and/or computer.

  • Page 56: Testing The Accessory Slot And I/O Connections

    Power up the computer and perform any necessary diagnostics. At this point, if you have another DAS-TC/B board that you know is functional, you can test the slot and I/O connections using the instructions in the next section. If you do not have another board, refer to the instructions on page 7-1 before calling Keithley for technical support.

  • Page 57: Technical Support

    Technical Support Before returning any equipment for repair, telephone for Keithley technical support at: 1-888-KEITHLEY Monday through Friday, 8:00 a.m. to 5:00 p.m. Eastern Time An applications engineer will help you diagnose and resolve your board problem over the telephone. To save time, please make sure you have the...
  • Page 58 If you are submitting your equipment for repair under warranty, Notes: you must include the invoice number and date of purchase. To enable Keithley to respond as quickly as possible, you must include the RMA number on the outside of the package. Troubleshooting...

  • Page 59: Specifications

    Specifications DAS-TC/B specifications are listed in the following tables: Table A-1. Analog Input Specifications Feature Value Inputs 16 differential inputs plus a CJC Thermocouple types B, E, J, K, R, S, and T Voltage gains 1, 125, 166.7, and 400 Overvoltage protection ±30V maximum for powered...
  • Page 60 Table A-2. Conversion Rate Specifications Conversion Speed (ms/chan) Temperature Volts Rejection Rate The speed values are for integer-output format. For floating-point format, add 1ms to each value. The rates shown are for updates of a single channel to the on-board data buffer. Using the DriverLINX driver, the maximum interupt rate to transfer this data is 2.1Hz (i.e., 475mS intervals), which limits the effective data rate to application programs.
  • Page 61 Types B, R, S, or T 1.0 × resolution rms Type E 1.5 × resolution rms Types J or K The offset error at all gains is canceled through periodic self-calibration that the DAS-TC/B microprocessor performs as a background task...
  • Page 62 Table A-7. Maximum Gain Error Temperature Coefficients Feature Temperature Coefficient Voltage Inputs @ gain = 1 ±7ppm/˚C @ gain = 125 ±10ppm/˚C @ gain = 166.7 ±12ppm/˚C @ gain = 400 ±17ppm/˚C Thermocouple Inputs Types B, R, S, or T ±17ppm/˚C Type E ±10ppm/˚C...
  • Page 63 Table A-10. Board Requirements Feature Specification PC I/O base address interface 100h to 3FFh DIP-switch-selectable Interrupt levels • DAS-TC version A: 2, 3, 4, 5, and 7 • DAS-TC/B: 3, 5, 7, 10, 11, 12, and 15...

  • Page 64: Connector Pin Assignments

    Connector Pin Assignments The following diagram shows the pin assignments of the DAS-TC/B main I/O connector and the I/O connectors of the STA-TC/B and STC-TC/B. +15V Isolated Voltage Source - 19 37 - Analog (B) Ground Channel 15 Low Input - 18...

  • Page 65: Ce Information For The Das-Tc/B

    EMC directive 89/336 EEC. If this directive is not of importance to your application, please disregard the information in this appendix. Keithley certifies that this product has been tested and found to be in compliance with the EMC directive and relevant harmonized standards.

  • Page 66: Declaration Of Conformity

    Importer’s Address Landsberger Str.65 D-82110 Germering, Munich Type of Equipment Data Acquisition Plug-in Boards Model Numbers DAS-TC/B and S-1800 with either an STC-TC/B or STA-TC/B Year of Manufacture 1996 I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive(s) and Standard(s).

  • Page 67: Cabling Instructions For The Ce Configuration

    DAS-TC/B are beneath this cover STC-TC/B Figure C-1. Connecting a DAS-TC/B Board to an STC-TC/B The STA-TC/B connects to the main I/O connector of the DAS-TC/B through the S-1800 cable, as shown in Figure C-2. S-1800 cable STA-TC/B DAS-TC/B...
  • Page 68 Index cable C-1800 S-1800 calibration CE information accessory certification C-1800 cable CHASSIS GND terminal on accessories S-1800 cable 4-11 4-12 4-13 4-14 4-15 using STA-TC/B 3-11 checking the installation connecting 4-7 CMRR (common mode rejection ratio) description 4-2 cold junction compensation summary 1-4 common mode STC-TC/B...

  • Page 69: Main I/O Connector

    I/O connector 4-14 manuals, DriverLINX 4-12 grounded thermocouple, connecting accessing grounding, electrostatic installing handling to protect board multiplexer, in DAS-TC/B to protect board grounds on accessories types 4-11 4-12 4-13 4-14 4-15 using Index...
  • Page 70 RMA number technical support termperature cold junction TestPoint software description Safety Precautions installation schematic thermocouple DAS-TC/B block diagram grounded thermocouple, connecting inputs 4-12 sensor, cold junction temperature open circuit detection. sgnal types 4-10 floating signal source, connecting ungrounded thermocouple, connecting...
  • Page 71 4-10 ungrounded thermocouple, connecting warranty repairs utility wrapper, anti-static Data Logger wrist strap, grounded Visual Basic DriverLINX driver for Visual C/C++ DriverLINX driver for voltage input specifications Index...
  • Page 72 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies. Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 1-888-KEITHLEY (534-8453) •...

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