National Instruments SCXI-1313 User manual

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™,NI-DAQ

™, and SCXI™are trademarks of National Instruments Corporation. Product and company

names mentioned herein are trademarks or trade names of their respective companies.

INSTALLATION GUIDE

SCXI -1313 HIGH-VOLTAGE ATTENUATOR

TERMINAL BLOCK

This guide describes how to install and use the SCXI-1313 high-voltage

attenuator terminal block with an SCXI-1125 module.

Introduction

The SCXI-1313 high-voltage attenuator terminal block is shielded and has

screw terminals that connect to the SCXI-1125 input connector. Each

SCXI-1313 channel has a precision 100:1 resistive voltage divider that you

can use to measure voltages of up to 300 Vrms or ±300 VDC with the

SCXI-1125. You can individually bypass these dividers for low-voltage

measurement applications.

The terminal block has 18 screw terminals for easy signal connection. One

pair of screw terminals connects to the SCXI-1125 chassis ground. When

used with the SCXI-1125, the remaining eight pairs of screw terminals

connect signals to the eight analog inputs.

Conventions

The following conventions are used in this guide:

»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.

bold Bold text denotes items that you must select or click on in the software,

such as menu items and dialog box options.

™

SCXI-1313 Installation Guide 2 ni.com

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.

What You Need to Get Started

To set up and use your SCXI-1313 terminal block, you need the following

items:

❑SCXI-1313 high-voltage attenuator terminal block

❑SCXI-1313 High-Voltage Attenuator Terminal Block Installation

Guide

❑SCXI chassis

❑SCXI-1125 module

❑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-1313 Installation Guide

Safety Information

Cautions Do not operate the device in an explosive atmosphere or where there may be

flammable gases or fumes.

Keep away from live circuits. Do not remove equipment covers or shields unless you are

trained to do so. If signal wires are connected to the device, hazardous voltages can exist

even when the equipment is turned off. To avoid a shock hazard, do not perform procedures

involving cover or shield removal unless you are qualified to do so and disconnect all field

power prior to removing covers or shields.

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.

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.

Yo u must insulate all of your signal connections to the highest voltage with which the

SCXI-1125 can come in contact.

When using the device with high common-mode voltages, you must insulate your signal

wires for the highest input voltage. National Instruments is not liable for any damages or

injuries resulting from inadequate signal wire insulation. Use only 26-14 AWG wire with

a minimum voltage rating of 300 V and a temperature value of 60 °C for measuring up to

300 V.

When connecting or disconnecting signal lines to the SCXI terminal block screw terminals,

make sure the lines are powered off. Potential differences between the lines and the SCXI

ground can create a shock hazard while you connect the lines.

Connections, including power signals to ground and vice versa, that exceed any of the

maximum signal ratings on the SCXI device can create a shock or fire hazard, or can

damage any or all of the boards connected to the SCXI chassis, the host computer, and the

SCXI device. National Instruments is not liable for any damages or injuries resulting from

incorrect signal connections.

If hazardous voltages (≥30 Vrms and42.4V

peak or 60 VDC) are present, you must connect

a safety earth-ground wire to the terminal block safety-ground lug, shown in Figure 1.

This maintains compliance with UL-3111-1 and IEC-61010-1 and protects against electric

shock when the terminal block is not connected to the chassis. To connect the safety earth

ground to the safety-ground lug, run an earth-ground wire from the signal source to the

SCXI-1313 Installation Guide 4 ni.com

terminal block. National Instruments is not liable for any damages or injuries resulting

from inadequate safety earth-ground connections.

Do not loosen or re-orient the safety-ground lug hardware when connecting the safety

ground wire; to do so reduces the safety isolation between the high voltage and safety

ground.

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.

The terminal block must be used with a UL-listed SCXI chassis.

Configuring the High-Voltage Attenuator

Each channel has a 100:1 high-voltage attenuator. To enable or disable the

attenuator, either change the default configuration settings for the

SCXI-1313 in Measurement & Automation Explorer or adjust the input

limit ranges in your application. When using virtual channels, the input

limits configured in the virtual channel configurator are used to set the

attenuation circuitry appropriately.

The SCXI-1313 is factory calibrated to the specifications listed in the

Specifications section of this guide and is shipped with a calibration

certificate. The calibration EEPROM on the SCXI-1313 stores calibration

constants, which provide software correction values, that the application

development software uses to correct your measurements for gain errors in

the attenuation circuitry.

Table 1. Input Signal Range Versus Gain

Overall

Gain

Overall Voltage

Range

Module

Gain

Terminal

Block Gain

0.01 300 Vrms or VDC 10.01

0.02 ±250 Vpeak or VDC 20.01

0.05 ±100 Vpeak or VDC 50.01

0.1 ±50 Vpeak or VDC 10 0.01

0.2 ±25 Vpeak or VDC 20 0.01

0.5 ±10 Vpeak or VDC 50 0.01

1±5 Vpeak or VDC 1 1

2±2.5 Vpeak or VDC 2 1

2.5 ±2.0 Vpeak or VDC 250 0.01

©National Instruments Corporation 5 SCXI-1313 Installation Guide

Connecting Signals

Caution Refer to the Safety Information section before removing equipment covers or

connecting or disconnecting any signal wires.

To connect the signal to the terminal block, perform the following steps,

referringtoFigures1and2asnecessary:

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

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

5±1 Vpeak or VDC 5 1

10 ±500 mVpeak or VDC 10 1

20 ±250 mVpeak or VDC 20 1

50 ±100 mVpeak or VDC 50 1

100 ±50 mVpeak or VDC 100 1

200 ±25 mVpeak or VDC 200 1

250 ±20 mVpeak or VDC 250 1

500 ±10 mVpeak or VDC 500 1

1000 ±5 mVpeak or VDC 1000 1

2000 ±2.5 mVpeak or VDC 2000 1

Table 1. Input Signal Range Versus Gain (Continued)

Overall

Gain

Overall Voltage

Range

Module

Gain

Terminal

Block Gain

SCXI-1313 Installation Guide 6 ni.com

3. Prepare your signal wire by stripping the insulation no more than

7mm.

Figure 1. SCXI-1313 Parts Locator Diagram

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

insulation or padding if necessary.

Note When connecting your signals to the SCXI-1313, follow the labeling on the

SCXI-1313 for the appropriate module, as indicated in Figure 2.

1 Top Cover Screws

2TopCover

3Thumbscrew

4 Mating Connector

5 Strain-Relief Bar

6 Strain-Relief Screws

7 Safety-Ground Lug

Back View Front View

©National Instruments Corporation 7 SCXI-1313 Installation Guide

Figure 2. SCXI-1313 Signal Connections

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

stripped end of the wire fully into the terminal. No bare wire should

extend past the screw terminal. Exposed wire increases the risk of short

circuits and equipment failure.

6. Tighten the screws to a torque of 5–7in.-lb.

7. Connect the safety earth ground to the safety-ground lug. Refer to the

Safety Information section for connection information.

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

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

10. Connect the terminal block to the module front connector as explained

in the Installing the Terminal Block section.

1 Voltage Dividers

2 Product Name

3 Chassis Ground

4 Thermistor

5 Assembly Number and Revision Letter

6 Serial Number

7 Channel Labeling for SCXI-1123

8 Channel Labeling for SCXI-1125

9 Screw Terminals

10 Relays to Enable or Bypass the Attenuator

SCXI-1313 Installation Guide 8 ni.com

Installing the Terminal Block

To connect the terminal block to the SCXI module front connector, perform

the following steps:

1. Connect the module front connector to its mating connector on the

terminal block.

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

block to hold it securely in place.

Note For accurate cold-junction compensation, place the SCXI chassis away from an

extreme temperature differential.

Cleaning the Terminal Block

Clean the terminal block by brushing off light dust with a soft, nonmetallic

brush. Remove other contaminants with deionized water and a stiff

nonmetallic brush. The unit must be completely dry and free from

contaminants before returning it to service.

Calibrating the Terminal Block

For information on calibrating the SCXI-1313, see the SCXI-1313

High-Voltage Attenuator Terminal Block Calibration Procedure located

online at ni.com/calibration and follow the link for Manual

Calibration Procedures.

Specifications

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

Compatible module

SCXI-1125.......................................8 input channels

Input range

SCXI-1125.......................................300 Vrms or VDC

©National Instruments Corporation 9 SCXI-1313 Installation Guide

Cold-junction sensor

Sensor type...................................... Thermistor

Accuracy1........................................ ±0.5 °Cfrom15to35°C

±0.9 °Cfrom0to15°C

and35to55°C

Repeatability ................................... ±0.2 °Cfrom15to35°C

Output ............................................. 1.91 to 0.65 V

from0to50°C

Maximum temperature gradient

between sensor and any terminal .... ±0.4 °C (non-isothermal)

High-voltage divider

Accuracy ......................................... ±0.06% (for 100:1 setting)

Drift................................................. 15 ppm/°C

Resistance ....................................... 1 MΩ

Attenuation ratio ............................. 100:1 or 1:1

on programmatic basis

Common-mode isolation

Channel to channel.......................... 300 Vrms or ±300 VDC

Channel to ground........................... 300 Vrms or ±300 VDC

Coupling.......................................... DC only

Field-wiring connectors

Screw terminals

Signal terminals ....................... 16 (8 pairs)

Functional ground terminals .... 2

Maximum wire gauge.............. 16 AWG

Terminal spacing ..................... 0.5 cm (0.2 in.) center-to-center

Dimensions of front entrance.......... 1.2 by 7.3 cm (0.47 by 2.87 in.)

Solder pads for

additional components .................... None

Safety earth-ground lugs................. 1

Strain relief ..................................... Strain-relief bar at

terminal-block entrance

1The temperature sensor accuracy includes tolerances in all component values, effects caused by temperature and loading, and

self-heating. Errors caused by temperature gradients between terminals and the sensor are not included in this specification.

SCXI-1313 Installation Guide 10 ni.com

Mechanical

Dimensions .............................................17.8 by 7.94 by 3.0 cm

(7.0 by 3.125 by 1.2 in.)

Weight ....................................................200 g (7 oz)

Environment

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

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

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

Safety

Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA

C22.2 No. 1010.1 for electrical measuring and test equipment.

For use at altitudes up to 2000 meters.

Installation category II1

Pollution degree 2

Electromagnetic Compatibility

EMC/EMI ...............................................CE, C-Tick, and FCC Part 15

(Class A) Compliant

Electrical emissions ................................EN 55011 Class A at 10 m

FCC Part 15A above 1 GHz

Electrical immunity ................................Evaluated to EN 61326:1998,

Table 1

Note This device should only be operated with shielded cabling for full EMC and EMI

compliance. See the Declaration of Conformity for this product for any additional

regulatory compliance information.

1Category II refers to local-level power distribution, such as that provided by a standard wall outlet.

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