National Instruments TC-2095 Manuale utente

INSTALLATION GUIDE

BNC/TC-2095 Rack-Mount Adapter

This installation guide describes how to install the National Instruments

BNC-2095 and the TC-2095 rack-mount adapters and use them with

SCXI-1100, SCXI-1102/B/C, and SCXI-1104/C modules. The BNC-2095

also can be used with the SCXI-1581.

The BNC-2095 adapter has 32 BNC connectors to connect field signals to

the SCXI module inputs. The TC-2095 adapter has 32 uncompensated

miniconnectors to connect the thermocouples to the SCXI module inputs.

Both the BNC-2095 and TC-2095 adapters have the following features:

• A 96-pin connector to connect to the SCXI module using an SH96-96

shielded cable or an R9696 ribbon cable

• Rack-mount construction for use with 19-in. racks

• A shielded, metal enclosure to minimize noise

The TC-2095 also features isothermal construction to minimize the

temperature gradients across the thermocouple junctions and a

high-accuracy thermistor for cold-junction temperature sensing.

The BNC-2095 and the TC-2095 have pull-up resistors connected between

CH+ and +5 VDC and ground-referencing resistors connected between

CH– and chassis ground through switches located on the rear of the adapter.

The bias resistor is a ground-referencing pull-down resistor for referencing

floating signals; the pull-up resistor is used for open thermocouple

detection. The pull-up resistors enable open thermocouple detection by

detecting saturation in the SCXI module amplifier output and

ground-referenced floating signals.

BNC/TC-2095 Rack-Mount Adapter Installation Guide 2 ni.com

Conventions

The following conventions are used in this guide:

♦The ♦symbol indicates that the text following it applies only to a specific

product, a specific operating system, or a specific software version.

<> Angle brackets that contain numbers separated by an ellipsis represent a

range of values associated with a bit or signal name—for example,

DBIO<3..0>. Angle brackets also can denote a variable in a channel

name—for example, ACH<i>.

»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 symbol is marked on

the product, refer to the Read Me First: Safety 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 and hardware labels.

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, and code excerpts.

©National Instruments Corporation 3 BNC/TC-2095 Rack-Mount Adapter Installation Guide

What You Need To Get Started

To install and use the BNC/TC-2095, you need the following items:

❑One of the following:

– BNC-2095 rack-mount adapter with BNC connectors

– TC-2095 rack-mount adapter with thermocouple miniconnectors

❑BNC/TC-2095 Rack-Mount Adapter Installation Guide

❑Read Me First: Safety and Radio-Frequency Interference

❑Four 10 MΩ resistor networks

❑SCXI chassis and documentation

❑One of the following SCXI modules and its documentation:

– SCXI-1100

– SCXI-1102/B/C

– SCXI-1104/C

– SCXI-1581

❑One of the following cable assemblies:

– SH96-96 cable assembly (recommended)

– R9696 cable assembly

❑TBX cable adapter (included in cable assembly kit)

❑Number 1 Phillips screwdriver

❑1/8 in. flathead screwdriver

❑Long-nose pliers

Connecting Signals

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

This section describes how to connect field signals to the adapter and how

to connect the adapter to the SCXI module.

BNC/TC-2095 Rack-Mount Adapter Installation Guide 4 ni.com

Connecting Field Signals

♦BNC-2095

The BNC-2095 has 32 BNC connectors, one for each channel of a

SCXI module. Each BNC connector is labeled with the corresponding

channel number. The center pin of the BNC connector is the CH+, and

the outer shield is the CH– of each channel. The CH– is isolated from

the chassis ground, so you can use it for ground-referenced differential

signals. To ensure CH– is isolated from chassis ground, do not use bias

resistors.

Caution Do not force the BNC connector on the BNC-2095. If you have difficulty making

the connection, completely remove the connector and try again.

Connect the BNC connector of the cable to the BNC connector of the

BNC-2095 by aligning and inserting the connector and turning the

cable connector clockwise.

♦TC-2095

The TC-2095 has 32 universal thermocouple miniconnectors that you

can use to connect a thermocouple to each channel of the SCXI

module. Each connector is labeled with the corresponding channel

number. The miniconnector indicates the positive and negative

terminals.

Caution Do not force the miniconnector into the socket. If you have difficulty inserting the

miniconnector, check that the polarity is correct.

Connect the thermocouple wire to the TC-2095 by inserting the

miniconnector into the socket. Each miniconnector consists of two

spades of different widths. The differing widths guarantee correct

polarity if both connectors are correctly wired.

Both contacts of the thermocouple miniconnector are made of copper.

This could cause offset errors in T-, R-, and S-type thermocouple

measurements because each of these types of thermocouples has

one copper contact. Only one contact forms a cold junction with

T, R, and S-type thermocouples.

©National Instruments Corporation 5 BNC/TC-2095 Rack-Mount Adapter Installation Guide

Configuring Open-Thermocouple/Signal Detection and Signal

Ground-Referencing

Refer to Table 1 to configure the BNC/TC-2095 for operating with

open-thermocouple or signal detection, and for properly

ground-referencing the signals.

Table 1. Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing

Switch Settings Signal Type

Detects

Open

Thermocouple Comments

Floating signal or

thermocouple

Yes BNC-2095—Use this

setting for detecting

floating signals or open

signal leads. When

detecting open signal

leads, the positive input is

pulled to +5 VDC if the

measured signal is

<5 VDC. Only use this

setting or configuration

with signals between

±5 VDC.

TC-2095—Use this setting

to detect open

thermocouples and when

the thermocouple is

floating.

Ground-referenced

signal or

thermocouple

No BNC-2095 or

TC-2095—Use this setting

when the signal or

thermocouple is

ground-referenced and

you want to disable

open-thermocouple

detection.

23 45678

GND REF

OFF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

23 45678

GND REF

OFF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

BNC/TC-2095 Rack-Mount Adapter Installation Guide 6 ni.com

Caution Connecting an external ground-referenced signal with the 10 Ω resistor network

in place can cause permanent damage to the resistor network and the traces on the

BNC/TC-2095 printed circuit board. NI is not liable for any damage or injuries resulting

from improper signal connections. Refer to the Temperature Sensor Output and Accuracy

section for more information.

Connecting the BNC/TC-2095 to the SCXI Module

Complete the following steps to mount the SH96-96 cable assembly and

connect the BNC/TC-2095 to the SCXI module. Refer to Figures 1 and 2

as needed.

Floating

thermocouple or

signal

No BNC-2095 or

TC-2095—Use this setting

when the signal or

thermocouple is floating

and you want to disable

open-thermocouple

detection.

Ground-referenced

thermocouple or

signal

Yes BNC-2095—Use this

setting for detecting

ground-referenced signals

or open signal leads.

When detecting open

signal leads, the positive

input is pulled to +5 VDC

if the measured signal is

<5 VDC. Only use this

setting or configuration

with signals between

±5 VDC.

TC-2095—Use this setting

to detect open

thermocouples for

ground-referenced

thermocouples.

Table 1. Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing (Continued)

Switch Settings Signal Type

Detects

Open

Thermocouple Comments

23 45678

GND REF

OFF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

23 45678

GND REF

OFF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

GND REF

PULL-UP

©National Instruments Corporation 7 BNC/TC-2095 Rack-Mount Adapter Installation Guide

Caution Refer to the Connecting Signals section before connecting the signals. If signal

wires are connected to the terminal block, dangerous voltages can exist even when the

equipment is powered off.

1. Power off the SCXI chassis.

2. Power off the computer that contains the E Series data acquisition

(DAQ) device, or disconnect the computer from the SCXI chassis.

3. Connect the TBX cable adapter to the SCXI module, and secure the

adapter by tightening both thumbscrews.

4. Connect either end of the SH96-96 cable to the TBX cable adapter and

SCXI module, and secure the cable by tightening both backshell

mounting screws.

Figure 1. Connecting the SH96-96 Cable to the SCXI Module

5. Mount the BNC/TC-2095 onto a 19-in. rack or place it on a workbench

near the SCXI chassis. If you do not rack-mount the BNC/TC-2095,

attach the four adhesive rubber feet included in the kit to the bottom of

the adapter to keep it stationary.

1 Backshell Mounting Screws

2 SH96-96 Cable

3 Thumbscrews

4 SCXI Chassis

5 TBX Cable Adapter

ADDRESS

BNC/TC-2095 Rack-Mount Adapter Installation Guide 8 ni.com

Note To minimize the temperature gradient inside the TC-2095 and maintain its

isothermal properties for accurate cold-junction compensation, keep the adapter from

extreme temperature differentials.

6. Connect the other end of the 96-pin cable to the BNC/TC-2095 96-pin

connector and screw down the backshell.

Caution The cable connectors of the cables are keyed. Do not force the connection. If you

encounter difficulty, verify that the keying of the cable connectors is correct.

Figure 2. BNC/TC-2095 Connected to SCXI Module

Configuring the BNC/TC-2095

To access jumpers W1 and W2 and the resistor networks, refer to Figure 3

as you complete the following steps:

1. Remove the nine cover screws that secure the BNC/TC-2095 cover.

2. Remove the cover.

3. Set jumpers W1 and W2 as needed. For more information about setting

the jumpers, refer to the Configuring the Shield Ground Jumper and

Configuring the Cold-Junction Sensor (TC-2095 Only) sections.

4. Replace the cover and secure it with the cover screws.

1 BNC/TC-2095 2 96-Pin Backshell 3 SCXI Chassis

2345678

234567 8

2345678

ADDRESS

2 32

©National Instruments Corporation 9 BNC/TC-2095 Rack-Mount Adapter Installation Guide

Figure 3. BNC-2095 Parts Locator Diagram

Configuring the Shield Ground Jumper

Jumper W2 connects the metal case and shield to the analog ground of the

SCXI module directly or through a 100 Ω resistor. The factory-default

setting is through the 100 Ω resistor. Refer to Table 2 for configuration

options for jumper W2.

1) Cover

2) Cover Screws (9)

3) RP1

4) RP5

5) RP2

6) RP5

7) W1

8) W2

9) RP3

10) RP7

11) RP4

12) RP8

13) Switches

12 11 10 98

BNC/TC-2095 Rack-Mount Adapter Installation Guide 10 ni.com

Table 2. BNC/TC-2095 Shield Ground Jumper Configuration

Jumper W2 Configuration Description When to Use a Setting

100 Ω(factory-default)—

Connects the

BNC/TC-2095 housing

to SCXI chassis ground

through a 100 Ω resistor,

while minimizing any

potential ground loop

current.

Use this setting when you are using

the SH96-96 cable, and if one of the

following is true:

• You have not rack-mounted the

BNC/TC-2095.

• You have rack-mounted the

BNC/TC-2095, but are unsure

whether the rack and the

BNC/TC-2095 are grounded.

0 Ω—Connects the

BNC/TC-2095 housing to

SCXI chassis ground.

Use this setting only if the

factory-default setting is inadequate

for noise rejection, you are using the

R9696 cable, and if one of the

following is true:

• You have not rack-mounted the

BNC/TC-2095.

• You have rack-mounted the

BNC/TC-2095 and are sure that

the rack and the BNC/TC-2095

are not grounded.

Open—Disconnects the

BNC/TC-2095 metal

housing from SCXI

chassis ground.

Use this setting only if all of the

following are true:

• Factory-default setting was

inadequate for noise rejection.

• You are using either the SH96-96

cable or the R9696 cable.

• You have rack-mounted the

BNC/TC-2095.

• You are sure that the rack and the

BNC/TC-2095 are grounded.

0 Ω

100 Ω

OPEN

4321

0 Ω

100 Ω

OPEN

4321

0 Ω

100 Ω

OPEN

4321

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