National Instruments SCXI-1100 Manuale utente

IVI™, National Instruments™,NI

™,ni.com™, and SCXI™are trademarks of National Instruments Corporation. Product and company names mentioned

herein are trademarks or trade names of their respective companies.

USER GUIDE

CALIBRATING THE SCXI -1100 WITH

CALIBRATION EXECUTIVE

Contents

Introduction............................................................................................. 2

What Is Calibration? ........................................................................ 2

Why Should You Verify? ................................................................ 2

How Often Should You Verify? ...................................................... 2

Equipment and Other Test Requirements ............................................... 2

Test Equipment ................................................................................ 2

Connectors ................................................................................ 3

Documentation................................................................................. 3

Software ........................................................................................... 3

Test Conditions ................................................................................ 4

Verification Procedure ............................................................................ 5

Setting Up Your Module for Verification........................................ 5

Connecting Your Calibrator and SCXI Module .............................. 9

Running the Calibration Executive Verification Procedure ............ 11

Technical Support Resources.................................................................. 12

NI Web Support ............................................................................... 12

Worldwide Support.......................................................................... 12

™

Calibrating the SCXI-1100 with Calibration Executive 2 ni.com

Introduction

This document contains information and step-by-step instructions for

loading and running a verification procedure for the SCXI-1100 using

Calibration Executive.

What Is Calibration?

Calibration consists of verifying the measurement accuracy of a module

and adjusting for any measurement error. Verification is measuring

performance of a module and comparing the results to the factory

specifications. Because the SCXI-1100 is not user-adjustable, calibrating

this module consists of verifying the performance only. National

Instruments Calibration Executive automates the verification of your

National Instruments measurement devices and modules.

Why Should You Verify?

The accuracy of electronic components drifts with time and temperature,

which can affect the measurement accuracy of the module. Verification

ensures that your module still meets National Instruments standards.

How Often Should You Verify?

The measurement accuracy requirements of your application determine

how often you should verify your SCXI-1100 module. National

Instruments recommends that you perform a complete calibration at least

once every year. You can shorten this interval to 90 days or six months

based on the demands of your application.

Equipment and Other Test Requirements

This section describes the equipment, documentation, and test conditions

needed for verification.

Test Equipment

Verification requires using a high-precision voltage standard with an

accuracy of at least 50 ppm and a 16-bit E Series data acquisition (DAQ)

device.

The Calibration Executive procedure runs in automated mode if you use

National Instruments IVI-supported calibrators. National Instruments

recommends you use the following equipment:

• Calibrator—Fluke 5700A

• 16-bit National Instruments E Series DAQ device

©National Instruments Corporation 3 Calibrating the SCXI-1100 with Calibration Executive

If you do not have these instruments, use the accuracy requirements listed

above to select a substitute calibration standard.

Note For an explanation of automated versus manual calibration, refer to the Automated

Versus Manual Calibration section in Chapter 2, Calibration Executive System Overview,

of your Calibration Executive Software User Manual.

Connectors

Although you can perform the verification procedure without any special

connectors, connecting and disconnecting your calibration hardware is

easier with the correct equipment. If you do not have custom connection

hardware, you may need the following connectors:

•Terminal block such as the National Instruments SCXI-1300.

•SCXI-1349 shielded cable assembly, which includes an SH68-68-EP

shielded cable and a cable adapter

Documentation

This section describes the documentation you need to calibrate your

SCXI-1100. The following documents contain information on installing

and using Calibration Executive and your SCXI-1100 module:

• Calibration Executive Software User Manual

• Getting Started with SCXI

• DAQ Quick Start Guide

• SCXI Quick Start Guide

• SCXI-1100 User Manual

You can download these documents from the National Instruments Web site

at ni.com/manuals

Software

Complete the following steps to install Calibration Executive:

1. Make sure that your computer and monitor are powered on and

that you have installed Windows 2000/NT/Me/9x.

2. Close all open applications.

3. Insert the installation CD into the CD-ROM drive.

4. Choose the Run option from the Start menu on the desktop task bar.

5. In the command line box, type x:\setup.exe (where xis the letter

of the CD-ROM drive you are using), and click OK.

6. Follow the instructions that appear in the dialog boxes.

Calibrating the SCXI-1100 with Calibration Executive 4 ni.com

The setup program installs Calibration Executive as well as

the associated files listed in Table 1.

Test Conditions

Follow these guidelines to optimize the connections and the environment

during verification:

•Keep connections to the SCXI module as short as possible. Long

cables and wires act as antennae, which conduct extra noise that can

affect measurements.

•Use shielded copper wire for all cable connections to the module.

Use twisted-pair wire to eliminate noise and thermal offsets.

•Maintain a temperature between 18 and 28 °C.

•Keep relative humidity below 80%.

•Allow a warm-up time of at least 30 minutes for the SCXI module and

the E Series DAQ device to ensure that the measurement circuitry is at

a stable operating temperature.

Table 1. Calibration Executive Directories and Supporting Files

Directory Name Contents

Calibration Executive\Procedures\SCXI-1100\Limits Microsoft Access

database that stores

the calibration

limits.

Calibration Executive\Procedures\SCXI-1100\Support Files Directory structure

that contains the

calibration

procedures.

Calibration Executive\Procedures\SCXI-1100\Support Files Required support

files.

©National Instruments Corporation 5 Calibrating the SCXI-1100 with Calibration Executive

Verification Procedure

This section explains how to set up and run the Calibration Executive

verification procedure. In automated mode, the procedure should take

approximately one hour. In manual mode, the calibration procedure can

take as long as two hours.

Setting Up Your Module for Verification

To make sure your module is ready for verification, refer to Figure 1 as you

perform the following steps:

1. Remove the side plate of the SCXI chassis.

2. Remove the cover of the SCXI-1100 to access the filter jumper.

3. Install the SCXI-1100 in slot 1 of the SCXI chassis.

4. Install the E Series DAQ device in your host computer.

5. Use the SCXI-1349 cable adapter to connect the SH68-68-EP cable

between the SCXI-1100 module and the E Series DAQ device

installed in your host computer.

6. Configure the hardware with Measurement & Automation Explorer

(MAX).

a. In the MAX Help file, select Help»Help Topics»NI-DAQ.

b. Double-click SCXI Devices.

c. Double-click the correct file for the hardware you want to

configure and follow the displayed instructions.

Calibrating the SCXI-1100 with Calibration Executive 6 ni.com

Figure 1. Connecting an SCXI Module to an E Series DAQ Device and an Adapter

The SCXI-1100 module has jumpers that you use to change the filter

settings, as shown in Table 2. During the verification procedure, you need

to change the filter settings to verify both the 4 Hz and 10 kHz measurement

accuracies. You can change the filter settings without powering down the

SCXI chassis.

Note Refer to Getting Started with SCXI, DAQ Quick Start Guide,andSCXI Quick Start

Guide if you need additional configuration information.

1 SCXI-1349 Cable Adapter

2 SH68-68-EP Shielded Cable Connector

3ESeriesDAQDevice

©National Instruments Corporation 7 Calibrating the SCXI-1100 with Calibration Executive

Table 3 shows the jumpers that you must set to the specified

(factory-default) settings.

Table 2. Filter Settings

Jumper Description Configuration

W2 Factory setting is full bandwidth (FBW)

andnofiltering

W3 10 kHz lowpass filter

W4 4 Hz lowpass filter

Table 3. Factory-Default Jumper Settings

Jumper Description Configuration

W1 Factory setting; parking position (used for

ground-referenced sources)

W5 Factory setting; connects MISO to

SERDATOUT

W2 W3 W4

1 2 3

Calibrating the SCXI-1100 with Calibration Executive 8 ni.com

W6 Factory setting; do not remove this jumper

W7 Factory setting; parking position.

Disconnects the front connector from the

module output

W8 Factory setting; parking position

W9 Factory setting; connects pullup to

SERDATOUT (revision C and higher

modules only)

W10 Factory setting; parking position (used

with MIO boards in differential mode)

W11 Factory setting; (Revision A and Revision

Bonly)

Table 3. Factory-Default Jumper Settings (Continued)

Jumper Description Configuration

321

©National Instruments Corporation 9 Calibrating the SCXI-1100 with Calibration Executive

Connecting Your Calibrator and SCXI Module

The Calibration Executive verification procedure steps you through the

connections between your calibrator and the SCXI module. The first

connections are as follows:

1. Connect the calibrator positive output to CH0+ of the SCXI-1300

terminal block.

2. Connect the calibrator negative output to CH0–of the SCXI-1300

terminal block.

3. Connect the calibrator guard and ground together, then connect these

to the CHO–of the terminal block.

4. Connect the terminal block to the front of the SCXI-1100.

Note If a terminal block is not available, you can connect to the pins on the front panel

using a 96-pin Euro-style connector. Refer to Figure 2 for the SCXI-1100 pin assignments.

Calibrating the SCXI-1100 with Calibration Executive 10 ni.com

Figure 2. SCXI-1100 Front Connector Pin Assignments

Number

Signal

Name

Column

ABC

Signal

Name

CGND

OUTPUT

AOREF

GUARD

DTEMP

MTEMP

+5 V

CGND

CH0–

CH0+

CH1–

CH3–

CH5–

CH7–

CH9–

CH11–

CH13–

CH15–

CH17–

CH19–

CH21–

CH23–

CH25–

CH27–

CH29–

CH31–

CH2–

CH4–

CH6–

CH8–

CH10–

CH12–

CH14–

CH16–

CH18–

CH20–

CH22–

CH24–

CH26–

CH28–

CH30–

CH1+

CH2+

CH3+

CH4+

CH5+

CH6+

CH7+

CH8+

CH9+

CH10+

CH11+

CH12+

CH13+

CH14+

CH15+

CH16+

CH17+

CH18+

CH29+

CH20+

CH21+

CH22+

CH23+

CH24+

CH25+

CH26+

CH27+

CH28+

CH29+

CH30+

CH31+

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