National Instruments TB-2725 User manual

INSTALLATION GUIDE
TB-2725 Terminal Block
This guide describes how to install and use the National Instruments
TB-2725 terminal block with the PXI-4224 modules. The TB-2725 has
16 screw terminals for easy connection of up to eight pairs of input signals,
and one SMB connector for external triggering.
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.
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 icon is marked on the
product, refer to the Read Me First: and Radio-Frequency Interference
document, shipped with the product, for precautions to take.
When symbol is marked on a product, it denotes a warning advising you to
take precautions to avoid electrical shock.
When symbol is marked on a product, it denotes a component that may be
hot. Touching this component may result in bodily injury.
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.

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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.
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.
What You Need to Get Started
To set up and use the TB-2725 terminal block, you need the following
items:
❑Hardware
– TB-2725 terminal block
– PXI-4224 module
– PXI or PXI/SCXI combination chassis
– Cabling and sensors as required for your application
❑Documentation
–TB-2725 TerminalBlock Installation Guide
– Read Me First: Safety and Radio-Frequency Interference
– DAQ Getting Started Guide
– SCXI Quick Start Guide
– NI PXI-4224 User Manual
– PXI or PXI/SCXI combination chassis user manual
Note You can download needed documents from ni.com/manuals.
❑Tools
– Number 1 and 2 Phillips screwdriver
– 1/8 in. flathead screwdriver
– Long-nose pliers
– Wire cutter
– Wire insulation stripper

©National Instruments Corporation 3 TB-2725 Terminal Block
Connecting the Signals
Note Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting or disconnecting any signal wires.
To connect signals to the TB-2725 terminal block, refer to Figure 1 while
performing the following steps:
1. Unscrew the top cover screw, and remove the top cover.
2. Loosen the strain-relief screws, and remove the strain-relief bar.
3. Prepare the signal wire (16 to 26 AWG) by stripping the insulation no
more than 6.0 mm (0.24 in.).
4. Run the signal wires through the strain-relief opening. If necessary,
add insulation or padding.
5. Insert the stripped ends of the signal wires into the terminals. Make
sure no bare wire extends from the terminal.
6. Tighten the screws to a torque of 0.5 to 0.6 N · m (4.4 to 5.3 lb - in.).
7. Soldier a ground wire to the Earth ground lug, as needed.
8. Reinstall the strain-relief bar, and tighten the strain-relief screws.
9. Reinstall the top cover, and tighten the top cover screws.
10. Refer to the SCXI Quick Start Guide for TB-2725 installation
instructions.

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Figure 1. PXI-2725 Parts Locator Diagram
1 Chassis Screws
2 Strain-Relief Opening
3 Strain-Relief Bar
4 Signal Cables
5 Strain-Relief Screw
6 Top Cover
7 Top Cover Screw
8 Rear Connector
9 Earth Ground Lug
10 Screw Terminals
12345678910 11 12 13 14 15 16
7
6
8
10
5
1
1
42
3
9

©National Instruments Corporation 5 TB-2725 Terminal Block
Specifications
All specifications are typical at 25 °C unless otherwise specified.
Electrical
Coupling................................................. DC1
Terminal wire size.................................. 16 to 26 AWG
Field-wiring connectors
Number of screw terminals............. 16
Earth ground lugs............................ 1
Strain relief ..................................... Strain relief at
terminal-block entrance
Mechanical
Dimensions............................................. 10.4 ×8.9 ×1.8 cm
(4.1 ×3.5 ×0.7 in.)
Weight.................................................... 285 gm (10 oz)
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the
common-mode voltage.
Channel-to-earth..................................... 42.4 Vpeak, 60 VDC,
Measurement Category I
Channel-to-channel ................................ 42.4 Vpeak, 60 VDC,
Measurement Category I
Environmental
Operating temperature............................ 0 to 50 °C
Storage temperature ............................... –20 to 70 °C
Humidity ................................................ 10 to 90% RH, noncondensing
Maximum altitude .................................. 2,000 meters
Pollution Degree (indoor use only)........ 2
1 In instrumentation terminology, DC coupling means that both DC and AC signals are passed.

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Safety
The TB-2725 terminal block meets the requirements of the following
standards for safety and electrical equipment for measurement, control,
and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1
• CAN/CSA C22.2 No. 61010-1
Note For UL and other safety certifications, refer to the product label or visit
ni.com/certification, search by model number or product line, and click the
appropriate link in the Certification column.
Electromagnetic Compatibility
Emissions................................................EN 55011 Class A at 10 m
FCC Part 15A above 1 GHz
Immunity ................................................EN 61326:1997 + A2:2001,
Table 1
EMC/EMI ...............................................CE, C-Tick, and FCC Part 15
(Class A) Compliant
Note For EMC compliance, operate this device with shielded cabling.
CE Compliance
The TB-2725 meets the essential requirements of applicable European
Directives, as amended for CE marking, as follows:
Low-Voltage Directive (safety)..............73/23/EEC
Electromagnetic Compatibility
Directive (EMC) .....................................89/336/EEC
Note Refer to the Declaration of Conformity (DoC) for this product for any additional
regulatory compliance information. To obtain the DoC for this product, visit
ni.com/certification, search by model number or product line, and click the
appropriate link in the Certification column.

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© 2005 National Instruments Corporation. All rights reserved. 373824B-01 Jul05