National Instruments SCXI-1300 Manual de usuario

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INSTALLATION GUIDE

SCXI™-1300/1301 TERMINAL BLOCK

This guide describes how to install and use the SCXI-1300 and SCXI-1301

terminal block with your SCXI module.

Introduction

The following sections describe the SCXI-1300/1301 terminal blocks and

their associated screw terminals.

SCXI-1300 Using the SCXI-1300 terminal block with 32-channel SCXI modules, you

can conveniently connect signals through screw terminals. Your terminal

block has the following features:

• Seventy-two screw terminals

• A cold-junction temperature sensor

• Thirty-two pairs of screw terminals that connect to the 32 differential

inputs of the SCXI module

• Two screw terminals that connect to the module functional chassis

ground pins

• A solder lug available as a safety chassis ground

• Additional screw terminals connect to the SCXI module OUTPUT,

the SCXI module AOREF, and to the SCXIbus GUARD

SCXI-1301 Using the SCXI-1301 terminal block, which has 20 screw terminals, you

can conveniently connect signals to the SCXI-1140 module. Your terminal

block has the following features:

• Eight pairs of screw terminals connect to the eight differential inputs

of the SCXI-1140 module

• Two screw terminals that connect to the AGND of the module

• Additional screw terminals that connect to the HOLD signal and

functional chassis ground

SCXI-1300/1301 Terminal Block 2 www.ni.com

What You Need to Get Started

To set up and use your SCXI-1300/1301 terminal block, you need the

following items:

❑SCXI-1300 or SCXI-1301 terminal block

❑SCXI-1300/1301 Terminal Block Installation Guide

❑SCXI chassis

❑SCXI module

❑Your SCXI module user manual

❑Number 1 and 2 Phillips-head screwdrivers

❑1/8 in. flathead screwdriver

❑Long-nose pliers

❑Wire cutter

❑Wire insulation stripper

©National Instruments Corporation 3 SCXI-1300/1301 Terminal Block

Connecting Signal Wires to the Terminal Block

Connect signal wires to the terminal block using the following procedure,

referring to Figures 1, 2, and 3 as necessary:

1. Unscrew the top cover screws and remove the top cover.

2. Loosen the strain-relief screws and remove the strain-relief bar.

Figure 1. SCXI-1300/1301 Parts Locator Diagram

3. Run the signal wires through the strain-relief opening. You can add

insulation or padding if necessary.

4. Prepare your signal wire by stripping the insulation to no more

than 7 mm.

5. Connect the signal wires to the screw terminals by inserting the

stripped end of the wire fully into the terminals and tighten the

screws with a flathead screwdriver. Tighten the screws to a torque

of 5 to 7 in.-lb.

Caution Uninsulated wire extending past the screw terminal increases the risk of short

circuiting adjacent signals, causing the circuit to fail.

1 Strain-Relief Bar

2 Strain-Relief Screws 3 Earth-Ground

Solder Lug 4 Mating Connector

5 Thumbscrew 6 Top Cover Screws

7 Top Cover

Back View Front View

SCXI-1300/1301 Terminal Block 4 www.ni.com

6. Reinstall the strain-relief bar and tighten the strain-relief screws.

7. Reinstall the top cover and tighten the top cover screws.

When connecting signals to the SCXI-1300 terminal block, follow the

labeling on the SCXI-1300 terminal block, as indicated in Figure 2.

Figure 2. SCXI-1300 Signal Connections

1 Screw Terminals 2 Mating Connector

©National Instruments Corporation 5 SCXI-1300/1301 Terminal Block

When connecting signals to the SCXI-1301 terminal block, follow the

labeling on the SCXI-1301 terminal block, as indicated in Figure 3.

Figure 3. SCXI-1301 Signal Connections

You are ready to connect the terminal block to the module front connector

as explained in the Connecting the Terminal Block to the SCXI Module

section.

1 Screw Terminals 2 Mating Connector

SCXI-1300/1301 Terminal Block 6 www.ni.com

Connecting the Terminal Block to the SCXI Module

ToconnecttheterminalblocktotheSCXImodulefrontconnector,perform

the following steps:

1. Connect the SCXI-1300/1301 terminal block to the mating connector

on the module front connector.

2. Tighten the top and bottom thumbscrews on the back of the terminal

block to hold it securely in place.

Using the SCXI-1300 with Thermocouples

This section describes how to use the thermocouple capability of your

SCXI-1300 terminal block.

Connecting Thermocouples

♦SCXI-1100

If you are using a ground-referenced thermocouple, connect the

thermocouple positive and negative leads to CH+ and CH– respectively.

Leave jumper W1 on the SCXI-1100 in the factory-default (parking)

position.

If you are using a non-referenced (floating) thermocouple, the SCXI-1100

instrumentation amplifier can be driven into saturation if the thermocouple

is not grounded properly. Choose one of the following two options to

ground the thermocouple:

• Ground the negative lead of the thermocouple near the thermocouple

junction. Leave jumper W1 on the SCXI-1100 in the factory-default

(parking) position.

• Ground the negative lead of the thermocouple inside the SCXI-1300

terminal block, by connecting CH– to CHSGND as shown in Figure 4.

In most applications, this is the most convenient grounding option.

Leave jumper W1 on the SCXI-1100 in the factory-default (parking)

position.

Note National Instruments does not recommend setting jumper W1 on the SCXI-1100

in the non-parking position. This grounds the negative terminal on the SCXI-1100

instrumentation amplifier through a 100 kΩresistor, possibly increasing measurement

noise and settling time.

©National Instruments Corporation 7 SCXI-1300/1301 Terminal Block

Figure 4. Connecting a Thermocouple to SCXI-1300 Channel 0

1 Channel 0 2 Chassis Ground 3 Thermocouple

SCXI-1300/1301 Terminal Block 8 www.ni.com

♦SCXI-1102/B/C

If you are using a ground-referenced thermocouple, connect the

thermocouple positive and negative leads to CH+ and CH– respectively.

If you are using a non-referenced (floating) thermocouple, choose one of

the two options to ground the thermocouple:

• Ground the negative lead of the thermocouple near the thermocouple

junction.

• Ground the negative lead of the thermocouple inside the SCXI-1300

terminal block, by connecting CH– to CHSGND as shown in Figure 4.

In most applications, this is the most convenient grounding option.

Caution Do not reference the thermocouple to ground at more than one point to avoid

measurement errors caused by ground loops.

Converting the Temperature Sensor Output Voltage to Temperature

The integrated-circuit temperature sensor outputs 10 mV/°C. If your

application software does not provide voltage-to-temperature conversion

for the cold-junction reference (CJR) of the SCXI-1300, you can determine

the CJR temperature using the following formulas:

where VTEMPOUT is the temperature sensor output voltage, and T(°F) and

T(°C) are the temperature readings in degrees Fahrenheit and degrees

Celsius, respectively.

Note Average a large number of samples to obtain the most accurate reading.

Reading the Temperature Sensor in LabVIEW

In LabVIEW, the channel address string used to read VTEMPOUT depends on

which module is connected to the SCXI-1300. For more information about

channel-string arrays and the SCXI channel-addressing syntax, see the

LabVIEW Data Acquisition Basics Manual.

♦SCXI-1100—use ob

!sc

!md

!mtemp. This channel-address string

cannot be in a channel-string array with other channels on the same

SCXI-1100 module.

♦SCXI-1102/B/C—use ob

!sc

!md

!mtemp. This channel-address

string can be in the same channel-string array as other channels on the same

T°C() 100 VTEMPOUT

()=

T°F() [T(

C)]9

----------------------- 32+=

©National Instruments Corporation 9 SCXI-1300/1301 Terminal Block

SCXI-1102/B/C module, but it must be the first element in the

channel-string array.

♦SCXI-1104/C—not applicable. Since the SCXI-1104/C is unsuitable for

use with thermocouples, VTEMPOUT is not routed through the module.

Cleaning the Terminal Block

To remove light dust, use a soft, nonmetallic brush. To remove other

contaminants, use deionized water and a stiff nonmetallic brush. The unit

must be completely dry and free from contanimants before returning to

service.

Specifications

All specifications are typical at 25 °C unless otherwise specified.

Electrical (Cold-Junction Sensor on the SCXI-1300)

Sensor type.............................................Integrated circuit (LM35CAZ)

Accuracy1...............................................± 1.3 °C from 0 to 50 °C

Repeatability ..........................................± 0.5 °C

Output.....................................................0 to 0.5 V from 0 to 50 °C (10

mV/°C)

Environment Operating temperature............................ 0 to 50 °C

Storage temperature ...............................–20 to 70 °C

Relative humidity...................................10 to 90%

Indoor use only

1 This includes the accuracy of the temperature sensor itself (± 0.9 °C) and the temperature difference between the temperature

sensor and any screw terminal (which may be as large as ± 0.4 °C ).

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