has convenient screw terminals for
connection of eld wiring, on a standard DIN rail. Some TBX terminal
blocks also include a temperature sensor for cold-junction
compensation when using thermocouples. Table 1 lists available TBX
terminal blocks, compatible SCXI modules, and required cabling to
connect the TBX terminal block.
Terminal Blocks
TBX terminal blocks provide screw terminals for convenient
connection of eld signals. The screw terminals pass the I/O signals to
a DIN connector, which you cable directly to an SCXI module
(see Figure 1). TBX terminal blocks, except
t h e T B X - 9 6 a n d T B X - 1 3 1 6 i n c l u d e a
hardened plastic cover and hardware for
mounting on a standard DIN rail.
TBX T
erminal Blocks
Signal Conditioning
TBX Terminal
Blocks for SCXI
541
Signal Conditioning
National Instruments
Tel: (512) 794-0100 Fax: (512) 683-9300 info@ni.com ni.com
Terminal Block
Compatible SCXI Modules
Cabling
CJC
Special Features
TBX-1303
SCXI-1100, SCXI-1102, SCXI-1102B/C, SCXI-1181
SH96-96 or R96-96 Open TC detection Isothermal construction,
selectable ground referencing
TBX-1316
SCXI-1120/D, SCXI-1125, SCXI-1126
SH32-32-A 200:1 attenuation (up to 1000 VDC)
TBX-1325
SCXI-1124
SH48-48-A High-voltage 250 VDC
TBX-1326
SCXI-1162, SCXI-1162HV, SCXI-1163, SCXI-1163R
SH48-48-B High-voltage 250 VDC
TBX-1328
SCXI-1120, SCXI-1120D, SCXI-1121,SCXI-1125, SCXI-1126
SH32-32-A Sockets for current input resistors, Isothermal construction,
High-voltage 250 VDC
TBX-1329
SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, SCXI-1126
SH32-32-A Selectable AC coupling (rejects up to 250 VDC)
TBX-96
SCXI-1100, SCXI-1102, SCXI-1102B/C,
SH96-96 or R96-96
SCXI-1104, SCXI-1181, SCXI-1104C
TBX-24F
All modules
user-supplied wiring
CB-50
SCXI-1180
NB1
* The TBX-24F is a general-purpose feedthrough terminal block that you can use with any SCXI module or front mounting terminal blocks.
Table 1. Terminal Block Conguration Guide
Figure 1. TBX Terminal Block
Cabled to SCXI Module
termblock
EXPRESS
CODES
For information or to
buy products online,
visit ni.com/catalog
and enter:
TBX-1303
......................................................................777207-03
The TBX-1303 (Figure 2), designed for thermocouples, is also very
effective for general-purpose applications. This terminal block includes
special features for thermocouples, including isothermal construction
with a plastic cover to minimize thermal gradients, open-
thermocouple detection circuitry, and automatic ground-referencing
circuitry. When using the TBX-1303 with the SCXI-1102 Series or
VXI-SC-1102 Series signal conditioning units, this terminal block
provides a high-impedance path to ground, so that systems work
reliably with either floating or ground-referenced thermocouples.
For applications with the SCXI-1100, you can congure the channels
to be ground-referenced or floating in blocks of eight channels.
For general-purpose applications, this terminal block includes
108 terminals, including CH+, CH-, and shield for each input channel.
The TBX-1303 also works with the SCXI-1181 breadboard module.
Figure 2. TBX-1303
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com TBX-96
....................................................................................................................777264-01
The TBX-96 is a mass termination terminal block that provides a generic solution for the SCXI-1100,
SCXI-1102 Series, SCXI-1104 Series, and the SCXI-1140 Series.
TBX-1316
............................................................................................................777207-16
With the TBX-1316 (Figure 3) high-voltage terminal block, you can extend the input range of
the SCXI-1120/D, SCXI-1125, or SCXI-1126 modules to ±1000 VDC (680V
rms
) Each input
channel includes a 200:1 attenuation circuit, and offers a positive, negative, and ground
terminal for up to 12-gauge wire. All signal connections are made inside of this enclosure that
can be panel-mounted or simply placed on a desktop. The hinged lid makes accessing the
signals easier during conguration, but also includes a keyed lock for safety. The TBX-1316 is
rated for Category III installations.
TBX-1325 ......................................................................................
777207-25
The TBX-1325 is a terminal block with 30 screw terminals for signal connections to the SCXI-1124
module. You cable the TBX-1325 to the SCXI-1124 with the SH48-48-A shielded cable.
TBX-1326
. ..........................................................................................................777207-26
The TBX-1326 (Figure 4) is a high-voltage terminal block with 48 screw terminals for signal
connections to the SCXI-1162, SCXI-1162HV, SCXI-1163, and SCXI-1163R modules. You can cable the
TBX-1326 to the SCXI module with the SH48-48-B shielded cable. Warning: The TBX-1326 and
SH48-48-B limit the maximum working common-mode voltage between banks or between banks
and earth ground to 250 V
rms
maximum.
TBX-1328
..........................................................................................................777207-28
The TBX-1328 (Figure 5) is a terminal block for use with the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, and SCXI-1126 modules. The TBX-1328 includes a total of 24 screw terminals, including
three terminals (CH+, CH-, and chassis ground) for each input channel and sockets for the installation
of resistors for 4 to 20 mA inputs. When used with thermocouples, the TBX-1328 maximizes
measurement accuracy with an isothermal construction and a plastic cover that minimizes thermal
gradients across the terminal block and the resulting errors.
TBX-1329
............................................................................................................777207-29
The TBX-1329 (Figure 6) provides selectable AC coupling for the SCXI-1120, SCXI-1120D,
SCXI-1121, SCXI-1125, and SCXI-1126 modules. Each channel of the TBX-1329 terminal block
includes selectable AC coupling circuitry that can reject up to 250 VDC. The screw terminals on
the TBX-1329 are pluggable.
TBX-24F
..............................................................................................................777276-01
The TBX-24F is a general-purpose screw terminal block with feedthrough connections for
24 signal lines. You connect the TBX-24F to the SCXI module with discrete wires connected to a
standard SCXI terminal block. For example, you can use two TBX-24F blocks to terminate the I/O
lines for a single SCXI-1160 relay module, which requires 48 signal connections (16 relays, three
lines per relay). You individually wire the TBX-24F to a standard SCXI-1324 terminal block, which
attaches directly to the front of the SCXI-1160 module. This example configuration is
diagrammed in Figure 7.
TBX T
erminal Blocks
Signal Conditioning
Signal Conditioning
542
Figure 5. TBX-1328
Figure 6. TBX-1329
TBX Terminal
Blocks for SCXI
National Instruments
Tel: (512) 794-0100 Fax: (512) 683-9300 info@ni.com ni.com
Figure 4. TBX-1326
Figure 3. TBX-1316
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com Cable Assemblies
Shielded cable assemblies connect SCXI modules to TBX terminal blocks. The cable assemblies screw
securely into a metal adapter that attaches to an SCXI module like a front-mounting terminal block.
Cable Resistance
When used with SCXI modules that source an analog output voltage, such as the SCXI-1124 or
excitation voltage of the SCXI-1121, the wire resistance of the shielded cable (0.21 /m per wire)
can introduce errors caused by voltage drops in the cable. For example, the
SCXI-1124 analog output module can source a maximum of 5 mA in voltage output mode.
Therefore, a 2 m SH48-48-A cable, with a total resistance of 0.42 /m per channel (two wires
per channel), can reduce the output voltage by up to 5 mA * 0.42 /m * 2 m = 4.2 mV.
Backshell Kit
SBS-96F
....................................................................................................................777253-01
The SBS-96F is a shielded backshell kit for building custom cables to connect the TBX-1303 to an
SCXI-1100, SCXI-1102, SCXI-1102B/C, SCXI-1104, or SCXI-1181. The SBS-96F includes one 96-pin
DIN connector with solder cups for connection of eld wires.
Rack-Mount Assembly
TBX-RM1
....................................................................................................................777290-01
The TBX-RM1 rack-mount assembly (Figure 8) holds TBX terminal blocks in standard 19 in.
rack-enclosures. The TBX-RM1 includes a standard DIN rail mounted on a recessed metal panel, with
wiring ducts for routing of eld wiring. The top and bottom of the TBX-RM1 are removable for
convenient reconguration. The TBX-RM1 can accommodate two TBX-1303 terminal blocks, three
small terminal blocks (TBX-1325, TBX-1326, TBX-1328, TBX-1329, or TBX-24F), or one TBX-1303 and
one small terminal block (Table 2). The TBX-RM1 does not support the TBX-1316 High-Voltage
attenuator terminal block.
TBX Selection Guide
Use the following steps to select the correct combination of TBX terminal blocks and cables for
your SCXI system:
1. Select the required terminal blocks for each SCXI module, use Table 1 to select the proper
TBX terminal block. If a TBX-13xx terminal block is not available for your SCXI module, select
the appropriate number of general-purpose TBX-24F feedthrough terminal blocks.
2. Select cabling for each TBX terminal block, Table 1 lists the cable needed to connect the TBX
terminal block to the SCXI module. Shielded cables are available in lengths of 1, 2, and 5 m.
If using the TBX-1303, you also have the option to build a custom cable using the SBS-96F
backshell kit. For each TBX-1303 for which you will build a custo