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June 2002
371205A-01
TBX-1303 32-C
HANNEL
I
SOTHERMAL
T
ERMINAL
B
LOCK
I
NSTALLATION
G
UIDE
This guide describes how to install the National Instruments TBX-1303
32-channel isothermal terminal block and how to use it with SCXI-1100
and SCXI-1102/B/C modules.
The TBX-1303 is a DIN rail-mountable terminal block that connects
through a cable to the SCXI-1100 or SCXI-1102/B/C module input
connector. The TBX-1303 has a high-accuracy thermistor, cold-junction
temperature sensor, and an isothermal copper plane to minimize the
temperature gradients across the screw terminals when you take
measurements with thermocouples. The TBX-1303 mounts on most
European standard DIN EN mounting rails.
The TBX-1303 has 108 screw terminals. Thirty-two sets of three screw
terminals connect to the 32 differential inputs of the SCXI module and
shield each input. One pair of terminals labeled
GND
connects to the
chassis ground pins of the SCXI module. All the other terminals—
AIREF
,
AOREF
,
GUARD
,
OUT0+
,
OUT0–
,
OUT1+
,
OUT1–
,
OUTPUT
, and
their shields—are reserved for future use.
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