National Instruments PXI Terminal Block NI TB-2708 User manual

INSTALLATION GUIDE
NI TB-2708
PXI Terminal Block for S Series Devices
This installation guide describes how to install and connect signals to the
NI TB-2708 terminal block for use with PXI-6115/6120 S Series devices.
Caution The connectors of the TB-2708 are sensitive to electrostatic discharge (ESD). The
user should ground themselves and/or design watchdog timing into their application prior
to connecting or disconnecting signals.
Introduction
The TB-2708 is a terminal block assembly consisting of nine SMB
connectors and a 14-pin I/O connector. The terminal block assembly
connects directly to the front panel of National Instruments PXI-6115
and PXI-6120 devices, eliminating the need for an external cable.
Figure 1. TB-2708 Device View
1 Access Door to Configuration Switches
2 14-Pin I/O Connector (Digital Signals)
3 SMB Connectors (Analog Signals)
AI 0
AI 1
AI 2
AI 3
AO 0
AO 1
AI
ST
ART
TRIG
AI
SAMP
CLK
CTR 0
OUT
I
1
2
3

NI TB-2708 Installation Guide 2 ni.com
The nine SMB connectors on the TB-2708 allow you to easily connect
analog input and analog output signals to your National Instruments device.
The 14-pin I/O connector located on the bottom of the TB-2708 allows
access to digital signals.
Caution The TB-2708 is not designed for input voltages greater than 42 Vpk/60 VDC,
even if you install a voltage divider that reduces the voltage to within the input range of the
DAQ device. Input voltages greater than 42 Vpk/60 VDC can damage the TB-2708, any
device connected to it, and the host computer. Overvoltage also can cause an electric shock
hazard for the operator. National Instruments is not liable for damage or injury resulting
from such misuse.
What You Need to Get Started
You need the following to set up and use your terminal block:
❑NI TB-2708 Terminal Block Assembly
❑NI TB-2708 Installation Guide
❑One of the following:
– NI PXI-6115
– NI PXI-6120
❑S Series User Manual
❑Number 1 Phillips screwdriver
Safety Information
Cautions Do not operate the device in an explosive atmosphere or where there may be
flammable gases or fumes.
Do not operate damaged equipment. The safety protection features built into this device
can become impaired if the device becomes damaged in any way. If the device is damaged,
turn the device off and do not use it until service-trained personnel can check its safety.
If necessary, return the device to National Instruments for service and repair to ensure that
its safety is not compromised.
Do not operate this equipment in a manner that contradicts the information specified in this
document. Misuse of this equipment could result in a shock hazard.

©National Instruments Corporation 3 NI TB-2708 Installation Guide
Do not substitute parts or modify equipment. Because of the danger of introducing
additional hazards, do not install unauthorized parts or modify the device. Return the
device to National Instruments for service and repair to ensure that its safety features
are not compromised.
You must insulate all of your signal connections to the highest voltage with which the
TB-2708 can come in contact.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum signal ratings on the terminal block can create a shock or fire hazard, or can
damage any or all of the boards connected to the host computer and the terminal block.
National Instruments is not liable for any damages or injuries resulting from incorrect
signal connections.
Clean the module and accessories by brushing off light dust with a soft non-metallic brush.
Remove other contaminants with a stiff non-metallic brush. The unit must be completely
dry and free from contaminants before returning it to service.
Installation
The TB-2708 connects directly to the front panel of the PXI DAQ device,
as shown in Figure 2.
Figure 2. Connecting the TB-2708 to an S Series Device
1 Terminal Block Mounting Screws
2 PXI Chassis
3 68-Pin I/O Connector on PXI Device
2
3
1

NI TB-2708 Installation Guide 4 ni.com
To connect the terminal block to the PXI module I/O connector, refer to
Figure 2 as you complete the following steps:
1. Install the PXI module into the chassis and tighten the two module
screws. You must install the PXI device before connecting the
TB-2708. Refer to the DAQ Getting Started Guide for instructions
on installing your PXI device.
2. Guide the terminal block onto the PXI module connector.
Caution Do not force the terminal block when inserting it into or removing it from the PXI
module I/O connector.
3. Tighten the two terminal block mounting screws.
Signal Descriptions
Figure 3 shows the front panel of the TB-2708, and Figure 4 shows the
TB-2708 block diagram. Refer to Table 1 for a brief description of each
signal available on the TB-2708.
Figure 3. NI TB-2708 Front Panel

©National Instruments Corporation 5 NI TB-2708 Installation Guide
Figure 4. NI TB-2708 Block Diagram
For more detailed descriptions of these signals, refer to the S Series User
Manual.
Additional signal configuration information is available in Measurement &
Automation Explorer (MAX). To access this information in MAX,
select your device under Devices and Interfaces, and click the Device
Routes tab.
Table 1. TB-2708 Signal Descriptions
Signal Name Reference Direction Description
AI <0..3> AI GND Input Analog Input channels 0 through 3.
AO <0..1> AO GND Output Analog Output channels 0 and 1.
PFI 0/AI Start Trig D GND Input As an input, this pin is a programmable
function input (PFI).
Output As an output, this pin is the AI Start
Trigger signal.
PFI 7/AI SAMP CLK D GND Input As an input, this pin is a PFI.
Output As an output, this pin is the AI Sample
Clock signal.
CTR 0 OUT D GND Output Counter 0 Output.
AI <0..3> +
AI <0..3> –
Front Panel
SMB Connectors
DAQ Device
Signals
AI <0..3> GND
AO <0, 1>
AO <0, 1> GND
AI Start Trig,
AI SAMP CLK,
CTR 0 OUT
D GND
5 kΩ
0.1 μF

NI TB-2708 Installation Guide 6 ni.com
Measuring Floating Signals
You can use the TB-2708 to measure floating and ground-referenced
analog input signals. To measure floating signal sources, move the switch
located under the rubber-sealed door on the enclosure cover for the AI
channel you are using to the ON (floating source) switch position. In the
floating source switch position, the amplifier negative terminal connects to
ground through a 5 kΩresistor in parallel with a 0.1 μF capacitor. Table 2
shows the TB-2708 switch configuration options.
Measuring Ground-Referenced Signals
It is possible to set the switch on the TB-2708 to either the floating or
ground-referenced source position to measure ground-referenced signals.
However, for best results, use the OFF (ground-referenced source) switch
position to avoid ground loops. Refer to the S Series User Manual for more
information on measuring floating and ground-referenced signals.
Table 2. Configuration Summary
TB-2708 Switch
Configuration
Signal Source Types for S Series Devices
Floating Source Ground-Referenced Source
Floating Source
Ground-
Referenced Source
+
–
Signal
Source TB-2708
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended
+
–
Signal
Source TB-2708
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Not Recommended
+
–
Signal
Source TB-2708
Improper Configuration
DAQ Device
(Differential Input
Mode)
+
–
AI GND
+
–
Signal
Source TB-2708
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended

©National Instruments Corporation 7 NI TB-2708 Installation Guide
Cabling Options
This section describes the cabling options for accessing signals on the
TB-2708.
A 14-pin connector on the bottom of the TB-2708 provides access to
digital I/O signals. Use the MFIT-Pigtail Cable Assembly (part number
194123-01) to access digital signals on the TB-2708. The MFIT-Pigtail
Cable Assembly features a 14-pin I/O connector on one end and pigtail
conductors on the other end. The pigtail conductors on the cable assembly
can be used to terminate digital signals to the connector(s) your application
requires. Figure 5 and Table 3 list the pin assignments and wiring
information necessary for connecting the TB-2708 to DIO signals.
Figure 5. 14-Pin Digital I/O Connector
Table 3. TB-2708 Wiring Information for 14-Pos MFIT-Pigtail Cable
Assembly (Part Number 194123-01)
Pin Number Wire Color Signal Name
1Black GND
2White P0.0
3Red P0.1
4Green P0.2
Pin 14
Pin 8
Pin 7
Pin 1
14
13
12
11
10
9
8
7
6
5
4
3
2
1
PFI 9
CTR 1 OUT
CHASSIS GND
P0.7
P0.6
P0.5
P0.4
GND
CTR 0 OUT
P0.3
P0.2
P0.1
P0.0
GND

NI TB-2708 Installation Guide 8 ni.com
Table 4 lists the National Instruments cables available for connecting the
TB-2708 to both analog and digital user signals.
5Orange P0.3
6Blue CTR 0 OUT
7White/Black GND
8Red/Black P0.4
9Green/Black P0.5
10 Orange/Black P0.6
11 Blue/Black P0.7
12 Drain Wire CHASSIS GND
13 Red/White CTR 1 OUT
14 Green/White PFI 9
NC Blue/White —
Table 4. TB-2708 Cabling Options
Cable Length Part Number
SMB-100, SMB Female to BNC
Female Coaxial, 50 Ω
0.6 m 763389-01
SMB110, SMB to BNC Male
Coaxial, 50 Ω
1 m 763405-01
14-Pos MFIT-Pigtail Cable
Assembly
1 m 194123-01
Table 3. TB-2708 Wiring Information for 14-Pos MFIT-Pigtail Cable
Assembly (Part Number 194123-01) (Continued)
Pin Number Wire Color Signal Name

©National Instruments Corporation 9 NI TB-2708 Installation Guide
Specifications
This section lists the specifications of the TB-2708. These specifications
are typical at 25 °C unless otherwise specified.
Input/Output
Refer to the documentation for your PXI-6115/6120 S Series device to
determine the input/output specifications for your application.
Caution Do not apply an input voltage greater than 42 Vpk/60 VDC to the TB-2708. Input
voltages greater than 42 Vpk/60 VDC can damage the TB-2708 and any device connected
to it, including the host computer. Overvoltage can also cause an electric shock hazard for
the operator. National Instruments is not liable for damage or injury resulting from such
misuse.
Physical
Dimensions
Height.............................................. 10.7 ×8.6 ×2.0 cm
(4.2 ×3.4 ×0.8 in.)
Weight............................................. 144.6 g (5.1 oz)
I/O connectors
68-position SCSI-II type................. 1, female
SMB jacks....................................... 9
14-pin auxiliary connector .............. 1, Molex 14-pin microfit
connector
Shock and Vibration
Operational shock .................................. 30 g peak, half-sine, 11 ms pulse
(Tested in accordance with
IEC-60068-2-27. Test profile
developed in accordance with
MIL-PRF-28800F.)
Random vibration
Operating ........................................ 5 to 500 Hz, 0.3 grms
Nonoperating .................................. 5 to 500 Hz, 2.4 grms
(Tested in accordance with
IEC-60068-2-64. Nonoperating
test profile exceeds
the requirements of
MIL-PRF-28800F, Class 3.)

NI TB-2708 Installation Guide 10 ni.com
Environment
The NI TB-2708 is intended for indoor use only.
Operating temperature ............................0 to 55 °C
Storage temperature................................–20 to 70 °C
Relative humidity ...................................10 to 90% noncondensing
Pollution Degree .....................................2
Safety
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement, control,
and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 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.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling
center. For more information about WEEE recycling centers and National Instruments
WEEE initiatives, visit ni.com/environment/weee.htm.
Where to Go for Support
The National Instruments Web site is your complete resource for technical
support. At ni.com/support you have access to everything from
troubleshooting and application development self-help resources to email
and phone assistance from NI Application Engineers.
A Declaration of Conformity (DoC) is our claim of compliance with the
Council of the European Communities using the manufacturer’s
declaration of conformity. This system affords the user protection for
electronic compatibility (EMC) and product safety. You can obtain the DoC
for your product by visiting ni.com/certification. If your product
supports calibration, you can obtain the calibration certificate for your
product at ni.com/calibration.

©National Instruments Corporation 11 NI TB-2708 Installation Guide
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