TC-2190 ADAPTER WITH THERMOCOUPLE MINICONNECTORS INSTALLATION GUIDE This installation guide describes how to install and connect thermocouples and digital I/O signals to the TC-2190 adapter with thermocouple miniconnectors to use with the NI USB-4350, NI PXI-4351, and NI PCI-4351 data acquisition (DAQ) devices. Introduction The TC-2190 adapter consists of a shielded box with 14 miniconnectors that you can use to connect the thermocouples to the NI 435X for USB, PXI, and PCI. This adapter has two 68-pin connectors—one on the front and one on the rear. You can use either of the two connectors to connect the TC-2190 to the NI 435X using an SH6868 shielded cable (recommended) or an R6868 ribbon cable. You can also access the eight digital I/O lines and the digital ground of the NI 435X using the spring terminal blocks. This adapter is designed specifically for ease of use with thermocouples. It features isothermal construction to minimize the temperature gradients across the thermocouple junctions and a high-accuracy thermistor cold-junction temperature sensor. The TC-2190 connects to all the digital I/O lines on the NI 435X and all but two analog input channels (CH)—CH0 is dedicated to the cold-junction sensor and CH1 is dedicated to auto-zeroing circuitry. Refer to the NI 435X User Manual for further details on the cold-junction sensor and auto-zeroing circuitry. Conventions The following conventions are used in this guide: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box. National Instruments™, NI™, ni.com™, and NI-DAQ™ are trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents. ni.com © 1997–2002 National Instruments Corp. All rights reserved. October 2002 321674C-01 This icon denotes a note, which alerts you to important information. This icon denotes a caution, which advises you of precautions to take to avoid injury, data loss, or a system crash. When this symbol is marked on the product, refer to the Read Me First: Safety and Radio-Frequency Interference document, shipped with the product, for precautions to take. bold Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes parameter names. italic Italic text denotes variables, emphasis, a cross reference, or an introduction to a key concept. This font also denotes text that is a placeholder for a word or value that you must supply. monospace Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames and extensions, and code excerpts. NI 435X Refers to all devices in the National Instruments 4350 and 4351 families. What You Need to Get Started You need the following items to set up and use the TC-2190: ❑ TC-2190 adapter with thermocouple miniconnectors ❑ TC-2190 Adapter with Thermocouple Miniconnectors Installation Guide ❑ Read Me First: Safety and Radio-Frequency Interference ❑ NI PCI-4351, NI PXI-4351, or NI USB-4350 and documentation ❑ One of the following cable assemblies: – SH6868 shielded cable (recommended) – R6868 ribbon cable ❑ 1/8 in. flathead screwdriver ❑ Number 1 Phillips screwdriver ❑ Wire cutters TC-2190 Adapter Installation Guide 2 ni.com ❑ Wire insulation strippers ❑ Four adhesive rubber feet Configuring the Shield Ground Jumpers Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document before removing equipment covers or connecting/disconnecting any signal wires. Jumper W1, located inside the TC-2190 on the bottom of the board, connects the shield of the 68-pin connectors and the TC-2190 metal case to NI 435X ground through a 100 Ω resistor (default setting) or directly to NI 435X ground, or keeps the metal case and NI 435X ground separate. Table 1 shows the configuration options for jumper W1. Note Use the default setting for jumper W1 unless you notice degraded noise performance. © National Instruments Corporation 3 TC-2190 Adapter Installation Guide Table 1. TC-2190 Jumper Configuration Options Jumper W1 Configuration Description OPEN 100 Ω 0Ω OPEN 100 Ω (factory default)—This setting connects the TC-2190 metal chassis to NI 435X ground through a 100 Ω resistor, while keeping any potential ground loop current very small. Use this setting when you are using the SH6868 cable, and: 0 Ω—This setting connects the TC-2190 metal chassis to NI 435X ground. Use this setting when you are using the R6868 cable, and: Open—This setting disconnects the TC-2190 metal chassis from NI 435X ground. Use this setting when you are using either the SH6868 cable or the R6868 cable, and: 100 Ω 0Ω OPEN 100 Ω When to Use This Configuration 0Ω • You have not rack-mounted the TC-2190, or • You have mounted the TC-2190 on a rack, but are unsure whether the rack and the TC-2190 are grounded. • You have not rack-mounted the TC-2190, or • You have mounted the TC-2190 on a rack and are sure that the rack and the TC-2190 are not grounded. • You have mounted the TC-2190 on a rack, and • You are sure that the rack and the TC-2190 are grounded. If you need to change jumper W1, refer to Figure 1 as you complete the following steps: 1. Using the Number 1 Phillips screwdriver, remove the four countersunk front panel screws. 2. Remove the two rear panel screws that hold the rear 68-pin connector. 3. Hold the front panel and slide the assembly out of the metal case. 4. Set jumper W1 as needed. 5. Reassemble the TC-2190, following this procedure in reverse order. Do not overtighten the screws. TC-2190 Adapter Installation Guide 4 ni.com 1 7 3 2 4 5 O DI 0 D + 21 G 5 3 4 N V 5 D 76 6 3 1 2 3 Rear Panel Screws Jumper W1 Countersunk Front Panel Screws 4 5 Sprint Terminal Blocks Front 68-Pin Connector 6 7 Thermocouple Miniconnectors Rear 68-Pin Connector Figure 1. TC-2190 Parts Locator Diagram Connecting the Signals Refer to the NI 435X User Manual for examples on how to connect to the signals. Connecting Thermocouples Insert the thermocouple miniconnector to the mating miniconnector on the TC-2190. Each miniconnector is keyed; that is, it has two spades of different widths so that you can insert the thermocouple in only one way. Do not force the miniconnector. If you encounter difficulty while inserting the miniconnector, check whether the polarity is correct. © National Instruments Corporation 5 TC-2190 Adapter Installation Guide Connecting Digital I/O Signals Refer to Figure 1 as you complete the following steps to connect the digital signals to the TC-2190: 1. Use a wire cutter and wire insulation stripper to strip the wire ends as necessary to connect them to terminal blocks. You can use up to 20 AWG wire for connecting signals. 2. Push the spring below the DIO terminal block with a 1/8 in. flathead screwdriver to open the terminal block clasp. Keep the spring pressed through step 3. 3. Insert the stripped wires into the terminal blocks. 4. Release the spring. The wire should be firmly connected. Connecting the TC-2190 to the NI 435X Before installing the TC-2190, make sure you have set jumper W1 correctly for the application. You can mount the TC-2190 into a 19 in. rack or place it on a workbench near the NI 435X. If you do not rack-mount the TC-2190, attach the four adhesive rubber feet included in this kit to the TC-2190 to keep it stationary. Note To minimize the temperature gradient inside the terminal block and thus maintain its isothermal nature for accurate cold-junction compensation, place the accessory away from extreme temperature differentials. Refer to Figure 2 as you complete the following steps to connect the TC-2190 to the NI 435X: 1. Connect one end of the SH6868 or R6868 cable to the TC-2190 connector on either the front or the back, as desired. The two connectors should snap together. 2. Attach the connector on the other end of the SH6868 or R6868 cable to the NI 435X I/O connector. To disconnect the cable from the TC-2190, push the two ejector ears on the cable backshell and gently pull on the backshell. The cable should pop out. Do not pull the cable. The connectors of both the TC-2190 and the NI 435X are keyed. Do not force the cable. If you encounter difficulty, check whether the polarity is correct. Caution TC-2190 Adapter Installation Guide 6 ni.com 1 3 4 6 5 2 Front View 7 1 8 4 5 6 Rear View 1 2 3 4 TC-2190 Front Panel Front 68-Pin Connector Ejector Ears 5 6 7 8 SH6868 Shielded Cable NI 435X for USB, PXI, and PCI Rear Panel Rear 68-Pin Connector Figure 2. Connecting the TC-2190 to the NI 435X © National Instruments Corporation 7 TC-2190 Adapter Installation Guide Cold-Junction Temperature Sensor The TC-2190 cold-junction temperature sensor consists of a precision thermistor excited by the 25 µA current source on the NI 435X. At 25 °C, the resistance of the thermistor is 5,000 Ω. The thermistor resistance varies from 16,305 to 1,492 Ω over the 0 to 55 °C temperature range. The corresponding sensor output voltage varies from 408 to 37 mV over this temperature range. To select and measure the temperature sensor, refer to the data acquisition software documentation for programming information. Alternatively, you can use the following formulas to convert the cold-junction sensor voltage to cold-junction temperature: T(°C) = TK – 273.15 where TK is the temperature in Kelvin. 1 T K = ---------------------------------------------------------------3 a + b • ln R T + c • ( ln R T ) a = 1.295361 × 10 –3 b = 2.343159 × 10 –4 c = 1.018703 × 10 –7 RT = resistance of the thermistor in ohms ( °C ) • 9- + 32 T ( °F ) = T ----------------------5 where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit and degrees Celsius, respectively. Note When you have configured the NI 435X DAQ device with the correct accessory in Measurement & Automation Explorer, NI-DAQ can automatically perform cold-junction compensation on measurements taken on thermocouple channels. TC-2190 Adapter Installation Guide 8 ni.com Specifications Cold-junction sensor accuracy1 .............. 0.06 °C from 15 to 35 °C; 0.2 °C from 0 to 15 °C and 35 to 55 °C Maximum working voltage2 (signal + common mode) ....................... Each input should remain within ±42 V of ground Safety The TC-2190 meets the requirements of the following standards for safety and electrical equipment for measurement, control, and laboratory use: Note • EN 61010-1, IEC 61010-1 • UL 3121-1 • CAN/CSA C22.2 No. 1010.1 For UL and other safety certifications refer to the product label or to ni.com. Electromagnetic Compatibility CE, C-Tick, and FCC Part 15 (Class A) Compliant Electromagnetic emissions..................... EN 55011, ISM Group I, Class A at 10 m FCC Part 15A above 1 GHz Electromagnetic immunity ..................... Evaluated to EN 61326-1; A1:1998, Table 1 For full EMC compliance, you must operate this device with shielded cabling. In addition, all covers and filler panels must be installed. Refer to the Read Me First: Safety and Radio-Frequency Interference document for FCC Regulatory statements and related information. Note 1 2 Includes only the thermistor accuracy. The combined effects of the temperature sensor accuracy, as well as the current source accuracy due to tolerances in all components in the NI 435X, the effects caused by temperature and loading, and self-heating and current leakage are discussed in the NI 435X User Manual. Refer to the NI 435X maximum working voltage specification in Appendix A, Specifications, of the NI 435X User Manual; use the lower number of the two. © National Instruments Corporation 9 TC-2190 Adapter Installation Guide CE Compliance The TC-2190 meets the following amended essential requirements of applicable European Directives for CE marking: • Low-Voltage Directive (safety): 73/23/EEC • Electromagnetic Compatibility Directive (EMC): 89/336/EEC Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, click Declaration of Conformity at ni.com/hardref.nsf/. This Web site lists the DoCs by product family. Select the appropriate product family, followed by the product, and a link appears to the DoC in Adobe Acrobat format. Click the Acrobat icon to download or read the DoC. 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