CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks

CB-27T, TBX-68T, AND CB-68T ISOTHERMAL
TERMINAL BLOCKS INSTALLATION GUIDE
This installation guide describes how to install and connect signals to
the CB-27T, TBX-68T, and CB-68T isothermal terminal blocks for use
with the NI 435X products, which includes the NI USB-4350 for computers
that are USB compatible, NI PCMCIA-4350 for computers that are
PCMCIA compatible, NI PXI-4351 for PXI and CompactPCI chassis, and
NI PCI-4351 for PCI bus computers.
The CB-27T isothermal terminal block is a shielded board with screw
terminals that connects to the NI PCMCIA-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 and digital
signal conditioning accessory connections. It connects to the I/O connector
on the NI USB-4350, NI PXI-4351, and NI PCI-4351.
The CB-68T isothermal terminal block is a CA-1000 enclosure-mountable
terminal block that consists of a shielded board with screw terminals and
digital signal conditioning accessory connections. It connects to the I/O
connector on the NI USB-4350, NI PXI-4351, and NI PCI-4351.
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 TBX-68T and CB-68T also have connectors for cables from selected
relay and digital signal conditioning modules.
The terminal blocks provide connections to all digital I/O (DIO) lines on
the NI 435X devices. The terminal blocks also provide connections to all
except two analog input channels (CH)—CH0 is dedicated for the
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company names mentioned herein are trademarks or trade names of their respective companies. For patents covering
National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file
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© 1997–2002 National Instruments Corp. All rights reserved.
October 2002
321613D-01
cold-junction sensor and CH1 is dedicated for auto-zeroing circuitry. Refer
to the NI 435X User Manual for further details on these two channels.
Conventions
The following conventions are used in this guide:
»
The » symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.
♦
The ♦ symbol indicates that the following text applies only to a specific
product, a specific operating system, or a specific software version.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this symbol is marked on
the product, see the Read Me First: Safety and Radio-Frequency
Interference document, shipped with the product, for precautions to take.
bold
Bold text denotes items that you must select or click in the software, such
as menu items and dialog box options. Bold text also denotes parameter
names.
monospace
Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.
italic
Italic text denotes variables, emphasis, a cross reference, or an introduction
to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.
What You Need to Get Started
You need the following to set up and use the accessories:
❑ One of the following NI 435X devices:
–
NI PCMCIA-4350 or NI USB-4350
–
NI PXI-4351 or NI PCI-4351
❑ NI 435X User Manual
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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❑ CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Installation Guide
❑ Read Me First: Safety and Radio-Frequency Interference
❑ One of the following isothermal terminal blocks:
–
NI PCMCIA-4350
•
–
CB-27T isothermal terminal block
NI USB-4350, NI PXI-4351, and NI PCI-4351
•
TBX-68T isothermal terminal block
•
CB-68T isothermal terminal block
❑ One of the following cable assemblies:
–
NI PCMCIA-4350
•
–
PSH32-30F shielded cable
NI USB-4350, NI PXI-4351, and NI PCI-4351
•
SH6868 shielded cable (recommended)
•
R6868 ribbon cable
❑ Tie wraps (for CB-27T installation only)
❑ 1/8 in. flathead screwdriver
❑ Number 1 Phillips screwdriver
❑ Wire cutters
❑ Wire insulation strippers
For the CB-68T only:
❑ CA-1000 accessory enclosure
❑ CA-1000 Configurable Connector Accessory Enclosure
Installation Guide
For digital signal conditioning only:
❑ Digital signal conditioning accessory and its documentation
❑ NB7 or NB8 cable as required
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Installing the CB-68T into the CA-1000 Enclosure
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting/disconnecting any signal wires.
Refer to Figure 1 as you complete the following steps to install the CB-68T
into the CA-1000 enclosure:
1.
Remove the top cover of the CA-1000 by unscrewing the eight screws
with a Phillips screwdriver.
2.
Remove the rear panel of the CA-1000 enclosure by unscrewing the
four screws at the top of the panel using a Phillips screwdriver.
3.
Remove one of the half-panelettes (either the left or the right) by
removing the screw at the top of the panelette. If installing two
CB-68T units, remove both half-panelettes.
Note The CA-1000 holds up to two CB-68T units or one CB-68T unit and one digital
signal conditioning accessory.
4.
Install the custom panelette provided with the CB-68T on the side that
the half panelette was removed from in step 3.
5.
Insert the CB-68T in the CA-1000 enclosure so that the 68-pin
connector comes through the opening in the custom panelette. Attach
the CB-68T with the screws provided.
6.
Place the washer on the screw and screw it into the oval slot in the
CB-68T board.
7.
Install up to five blank panelettes in the rear of the CA-1000 enclosure
to fill openings. Tighten the screws with a Phillips screwdriver.
8.
Install the desired connector panelettes in the front of the CA-1000
enclosure. Many connector panelettes are available including
thermocouple connectors, BNC connectors, and banana jacks. Refer
to the CA-1000 Configurable Connector Accessory Enclosure
Installation Guide for more information.
9.
Connect the signal wires as directed in the Connecting the Signals to
the TBX-68T, CB27T, and CB-68T section of this document.
10. Replace the top cover.
Note To enable direct cabling on the CB-68T to an accessory in the same CA-1000
enclosure, you can optionally install two standard vertical 50-pin connectors on the
CB-68T in the locations provided. Do not connect an accessory to the external accessory
connector if you are using the internal accessory connector.
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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00
10
A-
2
C
5
4
1
Front
3
6
1
7
1
2
Half-Panelette
Top Cover
3
Custom Panelette
for CB-68T
4
5
CB-68T
Oval Slot
6
7
Blank Panelettes
Rear Panel
Figure 1. Installing the CB-68T
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Connecting the Signals to the TBX-68T, CB27T, and
CB-68T
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting/disconnecting any signal wires.
Refer to Figures 2, 3, and 4 as you complete the following steps to connect
the signals to the terminal block:
1.
Remove the CB-27T or TBX-68T terminal block cover by unscrewing
the four cover screws using the Phillips screwdriver.
2.
Remove the front panel of the CB-27T.
3.
Use wire cutters and wire insulation strippers to strip 6 mm (.25 in.)
from the end of the signal wires to connect them to the screw terminals.
4.
Loosen the screws in the screw terminals with a 1/8 in. flathead
screwdriver.
5.
Insert the stripped wires into the screw terminals. Tighten the screw
terminals with the 1/8 in. flathead screwdriver.
Note If you use digital signal conditioning accessories on the TBX-68T or CB-68T, lock
the cable connectors in place with the ejector ears.
6.
Make sure the signal wires can exit through the CB-27T or TBX-68T
terminal block cover panel opening. On the CB-27T, you can use
tie wraps to tie the wires to the strain-relief tabs. On the CB-68T,
you can use a strain-relief panelette or wire the signals to a variety
of available connector panelettes. Many connector panelettes are
available including thermocouple connectors, BNC connectors, and
banana jacks. Refer to the CA-1000 Configurable Connector
Accessory Enclosure Installation Guide for more information.
Note The TBX-68T and CB-68T terminal blocks do not provide strain relief for signal
wires. Add strain relief and insulation for the signal wires, if necessary.
7.
Replace the front panel of the CB-27T.
8.
Replace the terminal block cover and tighten the cover screws.
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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1
2
3
10
6
7
9
5
4
8
1
2
3
4
5
Cover
Front Panel
Cover Panel Opening
Signal Wires
Tie Wrap
6
7
8
9
10
Screw Terminals
Strain-Relief Tabs
Cover Screws
S1, S2 Switches
Ejector Ears
Figure 2. CB-27T Parts Locator Diagram
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
1
2
4
11
5
6
3
10
7
9
8
1
2
3
4
Cover
Cover Opening
External Power Screw Terminals
S3 Switch
5
6
7
8
SW1, SW2 Switches
DIO Selectable Connector
Buffered Digital Output Connector
Signal Wires
9 Screw Terminals
10 S1, S2 Switches
11 Cover Screws
Figure 3. TBX-68T Parts Locator Diagram
2
3
1
4
5
7
8
9
1
6
1
2
3
4
5
6
Screw Terminals
S1, S2 Switches
DIO Combo Connector
Footprint for Optional DIO Selectable Connector
Footprint for Optional Buffered Digital Output Connector
6
7
8
9
Breadboard Area
SW1, SW2 Switches
S3 Switch
External Power Screw Terminals
Figure 4. CB-68T Parts Locator Diagram
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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Connecting the TBX-68T, CB-27T, and CB-68T
to the NI 435X
Note To minimize the temperature gradient inside the terminal block and thus maintain its
isothermal nature for accurate cold-junction compensation, place the terminal block away
from extreme temperature differentials.
Refer to Figures 5, 6, and 7 as you complete the following steps to connect
the terminal block to the NI 435X connector:
1.
Attach one end of the cable to the NI 435X device.
2.
Attach the other end of the cable to the terminal block.
♦
On the CB-27T, use the ejector ears to lock the cable connector in place.
♦
On the TBX-68T and CB-68T, if you use the SH6868 cable, the two
connectors snap together. The R6868 ribbon cable has no latches and
simply joins together without a snap.
To disconnect the cable from the CB-27T and accessories from the
TBX-68T or CB-68T, press outward on the ejector ears; the cable will pop
out. To disconnect the SH6868 cable from the TBX-68T or CB-68T, push
the two ejector ears on the backshell of the cable and gently pull on the
backshell. Do not pull the cable.
The connectors of both the NI 435X device and the cable are keyed for correct
attachment. Do not force the cable when inserting it into or removing it from the NI 435X
connector.
Caution
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
1
2
3
4
5
7
6
1
2
3
Portable Computer
PCMCIA Slot
NI PCMCIA-4350
4
5
PSH32-30F Shielded Cable
CB-27T
6
7
Signal Wires
NI PCMCIA-4350 I/O Connector
Figure 5. Connecting the CB-27T Cable Assembly
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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1
6
2
5
4
3
1
2
3
SH6868 Shielded Cable (Shown) or R6868 Ribbon Cable
NB7 Ribbon Cable (Shown) or NB8 Ribbon Cable
Signal Wires
4
5
6
TBX-68T
Ejector Ears
NI 435X (USB, PXI, PCI)
Figure 6. Connecting the TBX-68T Cable Assembly
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
1
2
3
2
6
4
5
1
2
3
NI 435X (USB, PXI, PCI)
Ejector Ears
SH6868 Shielded Cable (Shown)
or R6868 Ribbon Cable
4
5
6
NB7 Ribbon Cable (Shown) or NB8 Ribbon Cable
Signal Wires
CB-68T
Figure 7. Connecting the CB-68T Cable Assembly
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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Rack-Mounting the TBX-68T or CB-68T
When you have completed signal connections and terminal block
installation, you can mount the TBX-68T assembly into the rack. If you are
using the National Instruments TBX rack-mount assembly, refer to the TBX
Rack-Mount Kit Installation Guide for instructions.
If you are not using this rack-mount assembly, mount the TBX assembly
directly onto the DIN rail by snapping the TBX-68T bottom onto the DIN
rail with a firm push.
To remove the TBX-68T from the DIN rail, place a flathead screwdriver
into the slot above the terminal block base and pry it away from the rail.
If you are using the CB-68T, refer to the CA-1000 Configurable Connector
Accessory Enclosure Installation Guide for instructions.
Note You cannot mount the CB-27T onto a rack.
Using the Current Source
You can use the current sources on the NI 435X devices to provide
excitation for RTDs, thermistors, and other resistors. Follow the
instructions in the NI 435X User Manual to connect the signals.
The screw terminals on the terminal block labeled IEX+, IEX0+, IEX1+,
IEX–, IEX0–, and IEX1– provide external access to this current source.
IEX+, IEX0+, and IEX1+ are the current outputs and IEX–, IEX0–, and
IEX1– are the current returns. To enable external access of the current
source IEX or IEX0, push both slide switches S1 and S2, shown in
Figures 2 and 3, to the ON position.
Note To measure the cold-junction temperature sensor while you are not using the current
source externally through IEX+ and IEX–, push the slide switches S1 and S2 to the OFF
position.
IEX+ and IEX– are equivalent to IEX0+ and IEX0– on the TBX-68T
and CB-68T.
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Cold-Junction Temperature Sensor
The CB-27T, TBX-68T, and the CB-68T cold-junction temperature
sensors consist of a precision thermistor powered by the 25 µA current
excitation source on the NI 435X device. At 25 °C, the resistance of the
thermistor is 5,000 Ω. The thermistor resistance varies from
16,305 to 1,492 Ω over a 0–55 °C temperature range. The corresponding
sensor output voltage varies from 408–37 mV over this temperature range.
To select and read the temperature sensor, refer to the software
documentation for programming information.
Alternatively, you can use the following formulas to convert the
cold-junction sensor voltage to cold-junction temperature:
T(°C) = TK – 273.15
where TK is the temperature in kelvin.
1
T K = ----------------------------------------------------------3
a + b ln R T + c [ ln ( R T ) ]
where
a = 1.295361 × 10 –3
b = 2.343159 × 10 –4
c = 1.018703 × 10 –7
RT = resistance of the thermistor in ohms
T ( °C ) ]9- + 32
T ( °F ) = [----------------------5
where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit
and degrees Celsius, respectively.
Note When you have configured the NI 435X device with the correct accessory in
Measurement & Automation Explorer, NI-DAQ can automatically perform cold-junction
compensation on measurements taken on thermocouple channels.
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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Using Digital Signal Conditioning Accessories
You can connect the TBX-68T and the CB-68T to up to two of the
following accessories at one time:
•
SSR 8-channel backplane for use with SSR (Solid-State Relay) Series
digital signal conditioning modules
•
SC-206X Series digital signal conditioning boards
•
ER-8 electromechanical relay accessory
Use one of the following cable assemblies to connect these accessories to
the TBX-68T or CB-68T. Refer to Table 1 for connection information.
•
Use the NB8 ribbon cable for the SSR 8-channel backplane. Refer
to the SSR Series Modules and Backplanes User Guide for more
information.
•
Use the NB7 ribbon cable for the SC-206X Series digital conditioning
boards and the ER-8 electromechanical relay accessory. Refer to the
SC-206X Series User Manual and the ER-8/16 User Manual for more
information.
Table 1. Configuration Guide for the TBX-68T and CB-68T
Digital Signal
Conditioning Connector
Nonbuffered Individual
Line Switch-Selectable
Input/Output
Function
Input
Output
Buffered Output
Output
Accessory
Cable
SC-2060—8 optically isolated digital inputs
NB7
SSR-8—8 solid-state input relays
NB8
ER-8—8 low-cost electromechanical relays
NB7
SC-2061—8 optically isolated digital outputs
NB7
SC-2062—8 electromechanical relays
NB7
ER-8—8 low-cost electromechanical relays
NB7
SC-2061—8 optically isolated digital outputs
NB7
SC-2062—8 electromechanical relays
NB7
SSR-8—8 solid-state output relays
NB8
Refer to Figures 3 and 4 to locate the following:
•
A 26-pin individual channel, switch-selectable (SW1 and SW2)
buffered output/nonbuffered I/O connector
•
26-pin buffered output connector
•
Switch-selectable (S3) NI 435X/external 5 V power source for
accessories screw terminal (J15)
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Refer to Figures 8 and 9 for switch settings.
DIO Screw Terminal
DIOn
NI 435X
68-Pin
Connector
Buffer
Buffered Digital Output Connector DOn
DIO Selectable Connector SDIOn
BUFF OUT
SW2
0
1
2
3
DIO
Non-Buffered I/O Switch Position
Buffered Output Switch Position
DIOn
SW1
4
5
6
7
Figure 8. DIO-Selectable Connector Switches (SW1 and SW2) on the
TBX-68T and CB-68T
Note Digital input accessories attached to the DIO SELECTABLE connector control the
state of the corresponding digital lines of the BUFFERED DIGITAL OUTPUT connector.
PWR 435X
PWR 435X
+5 V from NI 435X
+5 V from External
Source at J15
+5 V EXT
+5 V EXT
Figure 9. Switch-Selectable 5 V Power Source for Accessories
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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Figures 10 and 11 show the pin assignments for the DIO-selectable and
buffered digital output 26-pin connectors.
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
Buffered DO 7
Buffered DO 6
Buffered DO 5
Buffered DO 4
Buffered DO 3
Buffered DO 2
Buffered DO 1
Buffered DO 0
PWR 435X/+5 V EXT
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
Figure 10. 26-Pin Buffered Digital Output Connector Pin Assignments
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
PWR 435X/+5 V EXT
DIO 7/Buffered DIO 7
DIO 6/Buffered DIO 6
DIO 5/Buffered DIO 5
DIO 4/Buffered DIO 4
DIO 3/Buffered DIO 3
DIO 2/Buffered DIO 2
DIO 1/Buffered DIO 1
DIO 0/Buffered DIO 0
PWR 435X/+5 V EXT
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
Figure 11. 26-Pin DIO-Selectable Connector Pin Assignments
© National Instruments Corporation
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CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
Specifications
Cold-junction temperature
sensor accuracy1 .....................................0.06 °C from 15 to 35 °C
0.2 °C from 0 to 15 °C and
35 to 55 °C
Isothermal accuracy ................................0.1 °C
Compatible DIN rails..............................DIN EN 50 022
DIN EN 50 035
Terminal block dimensions
CB-27T ............................................11.7 × 7.0 × 2.3 cm
(4.6 × 2.75 × 0.9 in.)
TBX-68T .........................................16.28 × 12.57 × 8.43 cm
(6.41 × 4.95 × 3.32 in.)
CB-68T ............................................16.7 × 16.5 × 3.2 cm
(6.6 × 6.5 × 1.25 in.)
Max working voltage2
(signal + common mode) ........................Each input should remain
within ±42 V of ground
Digital Output Specifications
Max non-buffered digital I/O3 ................8 mA source/8 mA sink
Max buffered digital output ....................15 mA source/64 mA sink
Safety
The CB-27T, TBX-68T, and CB-68T are designed to meet the
requirements of the following standards for safety and electrical equipment
for measurement, control, and laboratory use:
1
2
3
•
EN 61010-1, IEC 61010-1
•
UL 3111-1, UL3121-1
•
CAN/CSA C22.2 No. 1010.1
Includes only the thermistor accuracy. The combined effects of the temperature sensor accuracy, as well as the current source
tolerances due to tolerances in all component values in the NI 435X devices, the effects caused by temperature and loading,
and self-heating and current leakage are discussed in the NI 435X User Manual.
Refer to the NI 435X maximum working voltage specification; use the lower number of the two.
Refer to the NI 435X User Manual.
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
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Electromagnetic Compatibility
EMC/EMI............................................... CE, C-Tick, and FCC Part 15
(Class A) Compliant
Electromagnetic emissions..................... EN 55011 Class A at 10 m
FCC Part 15A above 1 GHz
Electromagnetic immunity ..................... Evaluated to EN 61326:1997/
A1:1998, Table 1
Note For full EMC compliance, you must operate this device with shielded cabling.
In addition, all covers and filler panels must be installed. Refer to the Declaration of
Conformity (DoC) for this product for any additional regulatory compliance information.
To obtain the DoC for this product, click Declaration of Conformity at
ni.com/hardref.nsf/. This Web site lists the DoCs by product family. Select the
appropriate product family, followed by your product, and a link to the DoC appears in
Adobe Acrobat format. Click the Acrobat icon to download or read the DoC. FCC
Regulatory Compliance Statements are contained in the Read Me First: Safety and
Radio-Frequency Interference document for this product.
Technical Support Resources
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installation, configuration, and application problems and questions. Online
problem-solving and diagnostic resources include frequently asked
questions, knowledge bases, product-specific troubleshooting wizards,
manuals, drivers, software updates, and more. Web support is available
through the Technical Support section of ni.com.
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National Instruments has offices located around the world to help address
your support needs. You can access our branch office Web sites from the
Worldwide Offices section of ni.com. Branch office Web sites provide
up-to-date contact information, support phone numbers, email addresses,
and current events.
© National Instruments Corporation
19
CB-27T, TBX-68T, and CB-68T Isothermal Terminal Blocks
If you have searched the technical support resources on our Web site
and still cannot find the answers you need, contact your local office or
National Instruments corporate. For telephone support in the United States,
dial 512 795 8248. For telephone support outside the United States, contact
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*321613DA-01
321613D-01
Oct02