National Instruments Network Card 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.  
I
AI  
AI  
0
1
1
AI  
AI  
2
3
1
O
A
3
O
A
A
T
AR  
T
S
IG  
A
AMP  
K  
S
CTR  
0
OUT  
2
1
2
Access Door to Configuration Switches 3 SMB Connectors (Analog Signals)  
14-Pin I/O Connector (Digital Signals)  
Figure 1. TB-2708 Device View  
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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.  
2
3
1
1
2
Terminal Block Mounting Screws  
PXI Chassis  
3
68-Pin I/O Connector on PXI Device  
Figure 2. Connecting the TB-2708 to an S Series Device  
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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  
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Table 1. TB-2708 Signal Descriptions  
Signal Name  
AI <0..3>  
Reference  
Direction  
Input  
Description  
AI GND  
AO GND  
D GND  
Analog Input channels 0 through 3.  
Analog Output channels 0 and 1.  
AO <0..1>  
Output  
Input  
PFI 0/AI Start Trig  
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  
CTR 0 OUT  
D GND  
D GND  
Input  
As an input, this pin is a PFI.  
Output  
As an output, this pin is the AI Sample  
Clock signal.  
Output  
Counter 0 Output.  
Front Panel  
SMB Connectors  
DAQ Device  
Signals  
AI <0..3> +  
AI <0..3> –  
5 kΩ  
AI <0..3> GND  
0.1 μF  
AO <0, 1>  
AO <0, 1> GND  
AI Start Trig,  
AI SAMP CLK,  
CTR 0 OUT  
D GND  
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.  
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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 kΩ resistor in parallel with a 0.1 μF capacitor. Table 2  
shows the TB-2708 switch configuration options.  
Table 2. Configuration Summary  
Signal Source Types for S Series Devices  
TB-2708 Switch  
Configuration  
Floating Source  
Ground-Referenced Source  
Floating Source  
DAQ Device  
(Differential Input  
Mode)  
DAQ Device  
(Differential Input  
Signal  
Source  
Signal  
Source  
TB-2708  
Mode)  
TB-2708  
+
–
+
–
+
–
+
–
AI GND  
AI GND  
Recommended  
Not Recommended  
Ground-  
Referenced Source  
DAQ Device  
(Differential Input  
Mode)  
DAQ Device  
(Differential Input  
Mode)  
Signal  
Source  
Signal  
Source  
TB-2708  
TB-2708  
+
–
+
–
+
–
+
–
AI GND  
AI GND  
Recommended  
Improper Configuration  
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.  
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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.  
7
6
5
4
3
2
1
14  
13  
12  
11  
10  
9
GND  
CTR 0 OUT  
P0.3  
PFI 9  
CTR 1 OUT  
CHASSIS GND  
P0.7  
Pin 14  
Pin 8  
Pin 7  
Pin 1  
P0.2  
P0.1  
P0.6  
P0.0  
P0.5  
8
GND  
P0.4  
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  
GND  
1
2
3
4
Black  
White  
Red  
P0.0  
P0.1  
P0.2  
Green  
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Table 3. TB-2708 Wiring Information for 14-Pos MFIT-Pigtail Cable  
Assembly (Part Number 194123-01) (Continued)  
Pin Number  
Wire Color  
Orange  
Signal Name  
5
6
P0.3  
Blue  
CTR 0 OUT  
GND  
7
White/Black  
Red/Black  
Green/Black  
Orange/Black  
Blue/Black  
Drain Wire  
Red/White  
Green/White  
Blue/White  
8
P0.4  
9
P0.5  
10  
11  
12  
13  
14  
NC  
P0.6  
P0.7  
CHASSIS GND  
CTR 1 OUT  
PFI 9  
—
Table 4 lists the National Instruments cables available for connecting the  
TB-2708 to both analog and digital user signals.  
Table 4. TB-2708 Cabling Options  
Cable  
Length  
0.6 m  
Part Number  
SMB-100, SMB Female to BNC  
763389-01  
Female Coaxial, 50 Ω  
SMB110, SMB to BNC Male  
Coaxial, 50 Ω  
1 m  
1 m  
763405-01  
194123-01  
14-Pos MFIT-Pigtail Cable  
Assembly  
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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.)  
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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.  
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