National Instruments PXI Terminal Block NI TB-2708 Bedienungsanleitung

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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

ART

TRIG

SAMP

CLK

CTR 0

OUT

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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.

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©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

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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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©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

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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 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

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©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

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

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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

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©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.)

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