National Instruments TBX-68S Installation Manual

INSTALLATION GUIDE
TBX-68S Isothermal Terminal Block
Contents

Introduction

This installation guide describes how to install and connect signals to the
TBX-68S isothermal terminal block for use with the NI 2501 and NI 2503
PXI switch cards.
Introduction ............................................................................................. 1
What You Need to Get Started ............................................................... 2
Signal Connection ................................................................................... 2
Installing Your Terminal Block .............................................................. 3
Rack-Mounting the TBX-68S ................................................................. 5
Cold-Junction Temperature Sensor......................................................... 5
Specifications .......................................................................................... 7
The TBX-68S is an isothermal DIN-rail mountable terminal block that
consists of a shielded board with screw terminals that connect directly to
the front panel I/O connector of the NI 2501 or NI 2503.
The terminals blocks can easily accommodate thermocouples, resistance
temperature detectors (RTDs), thermistors, and voltage signals. The
terminal blocks feature isothermal construction to minimize the
temperature gradients across the screw terminals and a high-accuracy
thermistor cold-junction temperature sensor for measuring with
thermocouples. Enclosures keep out air currents to maintain an isothermal
environment for the screw terminals and the cold-junction sensor. The
TBX-68S mounts on most European standard DIN EN mounting rails.
The TBX-68S provides screw terminal connections to all channels except
the cold-junction sensor.