National Instruments TBX-1303 Installation Manual

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_____________________________Product and company names are trademarks or trade names of their respective companies.321137A-01 © 1996 National Instruments Corporation. All rights reserved. March 1996NATIONALINSTRUMENTS®The Software is the Instrument ®Installation GuideTBX-1303 32-ChannelIsothermal Terminal BlockThis guide describes how to install and use the TBX-1303 32-channel isothermal terminal blockwith SCXI-1100 and SCXI-1102 modules.IntroductionThe TBX-1303 32-channel isothermal terminal block is a DIN rail-mountable terminal block thatconsists of a shielded board with screw terminals to connect to the SCXI-1100 orSCXI-1102 module input connector. The TBX-1303 has a high-accuracy thermistor, cold-junction temperature sensor and an isothermal copper plane to minimize the temperaturegradients across the screw terminals when you measure with thermocouples. The TBX-1303mounts on most European standard DIN EN mounting rails.The terminal block has 108 screw terminals for easy connection. Thirty-two sets of three screwterminals connect to the 32 differential inputs of the SCXI module and provide a shield for eachinput. Four terminals connect to the SCXI module OUTPUT, AOREF, and AIREF pins and tothe SCXIbus guard. One pair of terminals labeled GND connects to the chassis ground pins ofthe SCXI module. All of the other terminals—OUT0+, OUT0-, OUT1+, OUT1-, and theirshields—are reserved for future use.The TBX-1303 has a pullup resistor connected between CH+ and +5 V and a bias resistorconnected between CH- and chassis ground. These resistors help you detect open thermocouplesby detecting module amplifier output saturation.What You Need to Get StartedTBX-1303 32-channel isothermal terminal block kitTBX-1303 32-channel isothermal terminal blockTBX-1303 32-Channel Isothermal Terminal Block Installation GuideOne package of four 10 MΩ resistor networks1/8 in. flathead screwdriverSCXI chassis