National Instruments CB-27T Installation Manual

CB-27T
AND
T
ERMINAL
Introduction
DAQCard ™ and DAQMeter ™ are trademarks of National Instruments Corporation. Product and company names are trademarks or trade names of
their respective companies.
321613A-01
TBX-68T I
B
LOCKS
This installation guide describes how to install and connect signals to
the CB-27T and TBX-68T isothermal terminal blocks for use with the
DAQMeter 4350, which include the PC-4350 for the ISA bus and the
DAQCard-4350 for the PCMCIA slot.
The CB-27T isothermal terminal block is a shielded board with screw
terminals that connects to the DAQCard-4350 input/output (I/O)
connector.
The TBX-68T isothermal terminal block is a DIN-rail mountable
terminal block that consists of a shielded board with screw terminals
that connects to the PC-4350 I/O connector.
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-68T mounts on most European standard DIN EN
mounting rails.
The terminal blocks provide connections to all digital I/O lines on the
DAQMeter 4350. The terminal blocks also provide connections to all but
two analog input channels (CH)—CH0 is dedicated for the cold-junction
sensor and CH1 is dedicated for auto-zeroing circuitry. Refer to the
DAQMeter 4350 User Manual for further details on these two channels.
© Copyright 1997 National Instruments Corp. All rights reserved.
SOTHERMAL
August 1997