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SCXI Terminal Blocks
SCXI Terminal Blocks
Shielded terminal blocks for quick,
convenient signal connections
Strain relief clamps for reliable wiring
Connectivity options including BNC
and minithermocouple connectors
Special functionality
Onboard temperature
sensor for cold-junction compensation
Isothermal construction for high
accuracy thermocouple measurements
High-voltage attenuation
AC/DC coupling
Bridge offset nulling, shunt calibration
Current inputs
Overview
SCXI terminal blocks provide a convenient method for connecting and
disconnecting signals to your system. The SCXI-1300 Series of front-
mounting terminal blocks provides direct connections to transducers
at the screw terminals located within a fully shielded enclosure or at
front-mounted BNC connectors. Strain-relief clamps hold the signal
wires safely in place. Some SCXI-1300 Series terminal blocks are
designed for specific input types, including thermocouples, strain
gauges, and high-voltage inputs. See Table 1 to determine which SCXI
terminal blocks are compatible with your SCXI module.
You may also choose either the TC-2095 or BNC-2095
rackmount terminal blocks. These terminal blocks are ideal solutions
for large channel count temperature or voltage applications.
CJC 1
Terminal
Other Terminal
Module
Blocks
Sensor
Block Functions
–
SCXI-1121
SCXI-1320
SCXI-1321
Offset nulling and shunt calibration for strain gauges
SCXI-1327
Extends signal input range to 250 V rms , switch configurable per channel
SCXI-1328
Isothermal, high-accuracy design for thermocouples
–
SCXI-1305
BNC connectors, AC/DC coupling and signal ground referencing
–
SCXI-1122
SCXI-1322
–
SCXI-1127
SCXI-1331
–
SCXI-1128
SCXI-1332
Set up an 8 column by 4 row matrix
–
SCXI-1129
SCXI-1333
Configures SCXI-1129 as quad, 4 x 16 (2-wire) matrix
–
SCXI-1334
Configures SCXI-1129 as 4 x 64 (2-wire) matrix
–
SCXI-1335
Configures SCXI-1129 as 8 x 32 (2-wire) matrix
–
SCXI-1336
Configures SCXI-1129 as 16 x 16 (2-wire) matrix
–
SCXI-1337
Configures SCXI-1129 as a dual 8 x 16 (2-wire) matrix
–
SCXI-1339
Configures SCXI-1129 as a dual 4 x 32 (2-wire) matrix
––
SCXI-1124
SCXI-1325
––
SCXI-1140
SCXI-1301
SCXI-1304
–
AC/DC coupling and signal ground referencing (configurable per channel)
SCXI-1305
BNC connectors, AC/DC coupling and signal ground referencing
–
SCXI-1141
SCXI-1304
AC/DC coupling and signal ground referencing (configurable per channel) l
Terminal
CJC 1
Other Terminal
–
SCXI-1142
SCXI-1305
Module
Blocks
Sensor Block Functions
BNC connectors, AC/DC coupling and signal ground referencing
SCXI-1143
SCXI-1160
SCXI-1100
SCXI-1303 2
Isothermal, signal ground referencing, and open thermocouple detection
––
SCXI-1324
SCXI-1102
SCXI-1300
–
–
–
SCXI-1161
Screw terminals located in module
SCXI-1102B
SCXI-1308
–
Current Input, 249
resistor across each input
SCXI-1162/HV
SCXI-1326
SCXI-1102C
BNC-2095
–
BNC connectors, signal ground referencing
––
SCXI-1163/R
TC-2095
Thermocouple plugs, signal ground referencing, Isothermal
––
SCXI-1180
SCXI-1302
SCXI-1104/C
SCXI-1300
–
–
SCXI-1181
SCXI-1300
SCXI-1120
SCXI-1305
–
BNC connectors, AC/DC coupling and ground referencing
––
SCXI-1181K
SCXI-1301
SCXI-1120D
SCXI-1320
–
SCXI-1520
SCXI-1314
Quarter-bridge completion, 10-wire connections per channel
SCXI-1126
SCXI-1327
Extends signal input range to 250 V rms , switch configurable per channel
––
SCXI-1540
SCXI-1315
SCXI-1328
Isothermal, high-accuracy design for thermocouples
SCXI-1338
Current Input, 249
resistor across each input
1 Cold-junction compensation (CJC) sensor for thermocouple measurements.
2 Recommended for thermocouples; includes isothermal design and high-precision CJC sensor.
SCXI-1125
SCXI-1305
–
BNC connectors, AC/DC coupling and ground referencing
SCXI-1313
Extends signal input range to 300 V rms , programmable per channel
SCXI-1320
–
SCXI-1327
Module Connector and Shell Assembly
SCXI-1100, SCXI-1102B/C, SCXI-1140, SCXI-1141, SCXI-1181 SCXI-1310
SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1126, and SCXI-1181 SCXI-1330
Extends signal input range to 250 V rms , switch configurable per channel
SCXI-1328
Isothermal, high-accuracy design for thermocouples
SCXI-1338
Current Input, 249
resistor across each input
Table 1. Terminal Block Selection Guide
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
537
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SCXI Terminal Blocks
Descriptions
SCXI-1300 .............................................................................................................. 777687-00
The SCXI-1300 connects input signals to the SCXI-1100, SCXI-1102 Series, and SCXI-1104 Series modules. The SCXI-1300
is a general-purpose terminal block with an onboard temperature sensor for cold-junction compensation. You can also
use the SCXI-1300 with the SCXI-1181 and SCXI-1181K modules.
SCXI-1301 ..........................................................................................................................................777687-01
The SCXI-1301 is a terminal block with 20 screw terminals for use with the SCXI-1140, SCXI-1181, and SCXI-1181K modules.
SCXI-1302 ..........................................................................................................................................777687-02
The SCXI-1302 has 50 screw terminals for use with the SCXI-1180 feedthrough panel.
SCXI-1303 ..........................................................................................................................................777687-03
The SCXI-1303 (Figure 1) is a terminal block for use with the SCXI-1100 and SCXI-1102 Series modules. Designed
especially for high-accuracy thermocouple measurements, the SCXI-1303 includes isothermal construction that minimizes
errors caused by thermal gradients between terminals and the cold-junction sensor. The SCXI-1303 also includes circuitry
for open-thermocouple detection as well as automatic ground referencing for floating (nongrounded) thermocouples.
When used with the SCXI-1102 Series, the SCXI-1303 provides a high-impedance path (10 M Ω ) from the negative input
terminal to ground, so that the system works reliably with either floating or grounded thermocouples. You can configure
the channels of the SCXI-1303 for either floating or ground-referenced sources in blocks of eight channels.
Figure 1. SCXI-1303
Terminal Block
SCXI-1304 ..........................................................................................................................................777687-04
The SCXI-1304, for the SCXI-1140, SCXI-1141, SCXI-1142, and SCXI-1143 modules, includes AC coupling circuitry, with
switches on each channel. Each channel of the SCXI-1304 also includes a switchable connection to ground through a
100 k Ω bias resistor to provide a reference for floating input sources. The AC coupling circuitry on each channel has a corner
frequency of 0.16 Hz, rejection capacity of ±50 VDC, and input impedance of 2 M Ω
differential, 1 M Ω
common mode.
SCXI-1305 ..........................................................................................................................................777687-05
The SCXI-1305 (Figure 2) includes convenient BNC connectors for use with the SCXI-1120, SCXI-1120D, SCXI-1121,
SCXI-1125, SCXI-1126, SCXI-1140, SCXI-1141, SCXI-1142, and SCXI-1143 modules. Functionally equivalent to
the SCXI-1304 terminal block, the SCXI-1305 includes switchable AC coupling circuitry and ground referencing
on each channel.
Figure 2. SCXI-1305
Terminal Block
SCXI-1308 ..........................................................................................................................................777687-08
The SCXI-1308 is a current input terminal block for the SCXI-1100 and SCXI-1102 Series analog input modules. Each input
includes a 249 Ω
precision resistor, so you can read 0 to 20 mA and 4 to 20 mA current inputs.
SCXI-1310 ..........................................................................................................................................777687-10
The SCXI-1310 (Figure 3) connector and shell assembly can be used to create custom cabling solutions from the
SCXI-1100, SCXI-1102 Series, SCXI-1104 Series, SCXI-1140, SCXI-1141, SCXI-1142, SCXI-1143, and SCXI-1181 to
custom terminations. It is also a low-cost alternative to SCXI terminal blocks. A connector and shell assembly
consists of a hardened plastic enclosure and one connector with solder pins for signal connections.
SCXI-1313 ..........................................................................................................................................777687-13
With the SCXI-1313, you can extend the input range of the SCXI-1125 to 300 V rms or 300 VDC. The extended input voltage
range is enabled or disabled on a per-channel basis programmatically through software commands. The SCXI-1313 also
includes an onboard temperature sensor for cold-junction compensation with thermocouples. Using the SCXI-1313 will
reduce the input impedence of your SCXI module to 1 M Ω
Figure 3. SCXI-1310
Terminal Block
.
538
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
 
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SCXI Terminal Blocks
SCXI-1314 ..................................................................................................................................777687-14
The SCXI-1314 is a front-mounting terminal block for the SCXI-1520 universal strain gauge input module.
This terminal block includes a factory installed and socketed 350 Ω quarter-bridge completion resistor for each
channel. Eight 120 Ω resistors are included, but not installed for use with 120 Ω quarter-bridge strain gauges.
In addition, the terminal block includes two factory installed and socketed 100 K Ω shunt calibration resistors per
channel. All socketed resistors can be replaced by user-defined one-quarter Watt leaded resistors. This 8-channel
terminal block provides 11 screw terminals for each strain gauge channel, comprised of signal +, signal -,
power +, power -, remote sense +, remote sense -, quarter-bridge, two terminals for shunt calibration A, and
two terminals for shunt calibration B.
SCXI-1315 ..................................................................................................................................777687-15
The SCXI-1315 is a front-mounting terminal block for the SCXI-1540 LVDT input module. This 8-channel terminal
block provides six terminals for each LVDT channel, comprised of CH+, CH-, EX+, EX-, Synch, and GND.
Figure 4. SCXI-1320
Terminal Block
SCXI-1320 ..................................................................................................................................777687-20
The SCXI-1320 (Figure 4) is a general-purpose terminal block for connecting signals to the SCXI-1120 Series,
SCXI-1121, SCXI-1125, and SCXI-1126 modules. The SCXI-1320 includes an onboard temperature sensor for
measuring the reference junction temperature when using thermocouples. However, the SCXI-1328 is
recommended for precision thermocouple measurements.
SCXI-1321 ..................................................................................................................................777687-21
If you are using strain-gauge transducers with the SCXI-1121, (Figure 5), you can add offset nulling and shunt
calibration capability to your system with the SCXI-1321 terminal block. With a trimming potentiometer located on
the front panel of the SCXI-1321, you can manually null out the offset voltage of bridge transducers. Each channel
includes shunt calibration circuits, controllable as a group from software. When activated, a switch connects a 301
k Ω shunt resistor (R cal ) in parallel with the strain gauge. Both the nulling resistor (R null ) and the shunt resistor (R cal )
are socketed, so you can easily change their values to adjust the nulling range and shunt value.
SCXI-1322 ..................................................................................................................................777687-22
The SCXI-1322 is the terminal block required to connect signals to the SCXI-1122 module. The SCXI-1322 is a
general-purpose terminal block with an onboard temperature sensor for cold-junction compensation.
Figure 5. SCXI-1321
Terminal Block
SCXI-1324 ..................................................................................................................................777687-24
The SCXI-1324 is a high-voltage terminal block with 48 screw terminals for signal connections to the SCXI-1160
relay module.
SCXI-1325 ..................................................................................................................................777687-25
The SCXI-1325 is a terminal block with 26 screw terminals for signal connections to the SCXI-1124 module.
SCXI-1326 ..................................................................................................................................777687-26
The SCXI-1326 is a high-voltage terminal block with 48 screw terminals for signal connections to the SCXI-1162
Series and SCXI-1163 Series modules.
SCXI-1327 ..................................................................................................................................777687-27
With the SCXI-1327 (Figure 6) you can extend the input range of the SCXI-1120 Series and SCXI-1121 to ±250 V
and SCXI-1125 modules to 300 VDC or 300 V rms . You can also use the SCXI-1327 to extend the threshold level of
the SCXI-1126 module from 5 V up to 300 V. The extended input voltage range is enabled or disabled on a per
channel basis using switches located within the SCXI-1327. The SCXI-1327 also includes an onboard temperature
sensor for cold-junction compensation with thermocouples. Using the SCXI-1327 will reduce the input impedence
of your SCXI module to 1 M Ω
Figure 6. SCXI-1327
Terminal Block
.
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
539
 
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SCXI Terminal Blocks
SCXI-1328 ..........................................................................................................................................777687-28
If you are using thermocouples with the SCXI-1120 Series, SCXI-1121, or SCXI-1125 you can use the SCXI-1328 (Figure 7)
for maximum accuracy. The SCXI-1328 includes isothermal construction that minimizes errors caused by thermal gradients
between terminals and the high-precision cold-junction sensor.
SCXI-1330 ..........................................................................................................................................777687-30
The SCXI-1330 connector and shell assembly can be used to create custom cabling solutions from the
SCXI-1120/D, SCXI-1121, SCXI-1125, SCXI-1126, and SCXI-1181 to custom terminations. It is also a low-cost alternative to SCXI
terminal blocks. A connector and shell assembly consists of a hardened plastic enclosure and solder pins for signal connections.
SCXI-1331 ..........................................................................................................................................777687-31
The SCXI-1331 (Figure 8) is a general-purpose terminal block for use with the SCXI-1127 multiplexer/matrix module.
This terminal block provides 64 generic screw terminals for connection to the SCXI-1127 lines and a cold-junction
compensation sensor. Select the SCXI-1331 when using the SCXI-1127 as a multiplexer, or when you need matrix
configurations other than a multiple of 8 columns by 4 rows. The SCXI-1332 also includes sockets for matrix expansion cables.
Figure 7. SCXI-1328
Terminal Block
SCXI-1332 ..........................................................................................................................................777687-32
The SCXI-1332 (Figure 9) is a multiplexer/matrix terminal block for use with the SCXI-1127. This terminal block
configures the SCXI-1127 as an 8 column by 4 row switching matrix module. You can connect signals to both the
columns and rows using screw terminals.
SCXI-1333 ..........................................................................................................................................777687-33
SCXI-1334 ..........................................................................................................................................777687-34
SCXI-1335 ..........................................................................................................................................777687-35
SCXI-1336 ..........................................................................................................................................777687-36
SCXI-1337 ..........................................................................................................................................777687-37
SCXI-1339 ..........................................................................................................................................777687-39
These terminal blocks are designed for use with the SCXI-1129 high-density matrix switching module. Each of these
terminal blocks gives the high-density matrix a different configuration. See page 530 for more information on how to
choose the appropriate series of terminal blocks for the SCXI-1129.
Figure 8. SCXI-1331
Terminal Block
SCXI-1338 ..........................................................................................................................................777687-38
The SCXI-1338 is a current input terminal block for the SCXI-1120 Series, SCXI-1125, and SCXI-1126 analog input
modules. Each input includes a 249 Ω
precision resistor, so you can read 0 to 20 mA or 4 to 20 mA current inputs.
BNC-2095 ............................................................................................................................................777508-01
The BNC-2095 has 32 labeled BNC connectors, one for each input channel of the SCXI-1100 Series, or SCXI-1104 Series.
The BNC-2095 also includes circuitry for configurable signal referencing. Specifically, the negative (-) input of each
channel is referenced to ground through a 10 Ω or 10 M Ω resistor, and each positive (+) input is pulled up to 5 V through
a 10 M Ω resistor. You can enable or disable both the pull-up and pull-down resistors on a per channel basis using
switches located on the rear of the BNC-2095.
TC-2095 ..............................................................................................................................................777509-01
The TC-2095 has 32 miniature uncompensated thermocouple plugs, one for each input channel of the SCXI-1100 or
SCXI-1102 Series. The TC-2095 also includes a thermistor for accurate cold-junction compensation. In addition, the
TC-2095 includes circuitry for configurable signal referencing. Specifically, the negative (-) input of each channel is
referenced to ground through a 10 Ω or 10 M Ω resistor, and each positive (+) input is pulled up to 5 V using a 10
M Ω resistor. You can enable or disable both the pull-up and pull-down resistors on a per channel basis using switches
located on the rear of the TC-2095. The TC-2095 is not recommended for use with the SCXI-1104. The TC-2095
requires the SH96-96 or R96-96 for connection to a SCXI module.
Figure 9. SCXI-1332
Terminal Block
540
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
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