NI FP-AI-100 Manual de usuario

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USER GUIDE

CALIBRATING FIELDPOINT ANALOG INPUT MODULES

WITH CALIBRATION EXECUTIVE

Contents

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

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

Why Should You Calibrate? ............................................................ 2

How Often Should You Calibrate?.................................................. 2

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

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

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

Software ........................................................................................... 4

Test Conditions ................................................................................ 5

Calibration Procedures............................................................................ 5

Configuring Your FieldPoint AI Module for Calibration................ 6

Connecting the Calibrator to an FP-TC-120 Module ...................... 10

Connecting the Calibrator to an FP-AI-1xx Module ...................... 11

Connecting the Calibrator to an FP-RTD-122 Module ................... 12

Running the Calibration Executive Procedure................................. 13

Troubleshooting and Common Questions............................................... 14

Technical Support Resources.................................................................. 15

NI Web Support ............................................................................... 15

Worldwide Support.......................................................................... 15

™

Calibrating FieldPoint AI Modules with Calibration Executive 2 ni.com

Introduction

This document contains step-by-step instructions for loading and running

National Instruments Calibration Executive to calibrate FieldPoint analog

input (AI) modules, including the FP-AI-100, FP-AI-110, FP-AI-111,

FP-RTD-122, and FP-TC-120.

What Is Calibration?

Calibration consists of verifying the measurement accuracyof adevice

and adjusting for anymeasurement error.Verification is measuring

performance of a device and comparing the results to the factory

specifications. Calibration Executive automates the verification and

adjustment of National Instruments (NI) measurement devices.

Why Should You Calibrate?

The accuracy of electronic components drifts with time and temperature,

which can affect measurement accuracy as the device ages. Calibration

restores the device to its specified accuracy and ensures that it still meets

National Instruments standards.

How Often Should You Calibrate?

The measurement accuracy requirements of your application determine

how often you should calibrate a FieldPoint AI module. NI 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, software, and test

conditions you need to calibrate a FieldPoint module using Calibration

Executive.

Test Equipment

Calibration requires using a high-precision calibrator with the voltage

accuracy in parts per million (ppm) listed in Table 1.

©National Instruments Corporation 3 Calibrating FieldPoint AI Modules with Calibration Executive

NI recommends that you use the following instruments for calibration:

• FieldPoint FP-1000 network module

• FP-TB-CAL FieldPoint Calibration Terminal Base (part

number 777519-90), a modified FieldPoint base that allows you to

write new calibration constants to the module EEPROM

• 11-24 V power supply—NI PS-2 power supply

• RS-232 serial cable

If a Fluke 5700A is not available, use the accuracy specifications to choose

a substitute calibration standard.

Documentation

This section describes the documentation you need to calibrate a FieldPoint

AI module. In addition to this calibration procedure, you may need to refer

to the following documentation:

•Calibration Executive Software User Manual

•FP-1000/1001 User Manual

•FP-1000/1001 Quick Start Guide

• Operating instructions for the AI module

You can download these documents from the NI Web site at

ni.com/manuals.

Table 1. Test Equipment Specifications and Recommended Models

FieldPoint Module Voltage Accuracy (ppm) Recommended Calibrator

FP-AI-100 500 ppm Fluke 5500A or better

FP-AI-110 100 ppm Fluke 5500A or better

FP-AI-111 100 ppm Fluke 5500A or better

FP-RTD-122 20 ppm Fluke 5700A

FP-TC-120 30 ppm Fluke 5520A or better

Calibrating FieldPoint AI Modules with Calibration Executive 4 ni.com

Software

To calibrate the FieldPoint AI modules with Calibration Executive, you

need to install the FieldPoint calibration procedure for Calibration

Executive and FieldPoint Explorer on your system.

Complete the following steps to install the FieldPoint calibration procedure

for Calibration Executive:

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

that you have installed Windows NT/Me/98/95.

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, enter x:\setup.exe (where xis the letter

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

6. Follow the onscreen instructions to complete the installation.

The setup program installs Calibration Executive as well as

the associated files listed in Table 2.

Complete the following steps to install FieldPoint Explorer:

1. Insert the FieldPoint Explorer CD into the CD-ROM drive on your

computer.

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

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

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

4. Follow the onscreen instructions to complete the installation.

Table 2. Calibration Executive Directories and Supporting Files

Directory Name Contents

Calibration Executive

\Procedures\FP-XX-XXX\Limits

Microsoft Access database that

stores the calibration limits for

FieldPoint AI modules (excluding

FP-TC-120)

Calibration Executive\Procedures\FP-XX-XXX Directory structure that contains the

calibration procedures

Calibration Executive\

Procedures\FP-XX-XXX\Support Files

Required support files

©National Instruments Corporation 5 Calibrating FieldPoint AI Modules with Calibration Executive

Test Conditions

Follow these guidelines to optimize connections and test conditions during

calibration:

•Keep connections to the module short. Long cables and wires act as

antennae, picking up extra noise that can affect measurements.

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

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

•Maintain a temperature between 18 and 28 °C. To operate the module

at a specific temperature outside this range, calibrate the module at that

temperature.

•Keep relative humidity below 80%.

•Allow a warm-up time of at least 15 minutes to ensure that the

measurement circuitry is at a stable operating temperature.

Calibration Procedures

This section explains how to configure and set up the module for

calibration, and how to run the Calibration Executive procedure. Refer

to Table 3 for the approximate times to complete the procedure in both

automated and manual modes.

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 the Calibration Executive Software User Manual.

Table 3. Approximate Time to Complete Calibration Executive Procedure

Module Automated Mode Manual Mode

FP-TC-120 10 minutes 15 minutes

FP-AI-100 70 minutes 120 minutes

FP-AI-110 20 minutes 30 minutes

FP-AI-111 30 minutes 45 minutes

FP-RTD-122 10 minutes 15 minutes

Calibrating FieldPoint AI Modules with Calibration Executive 6 ni.com

Calibration consists of two main steps:

1. Configuring the module for calibration, which is described in the

Configuring theFieldPointAI Module forCalibration section ofthis

document.

2. Running the procedure to calibrate the module, which is described in

the Running the Calibration Executive Procedure section of this

document.

Configuring the FieldPoint AI Module for Calibration

To verify the operation of the test fixture, build a FieldPoint bank with a

network module, calibration terminal base, power supply, and the

FieldPoint AI module you are calibrating. Build the FieldPoint bank as

follows:

1. Attach the network module to the calibration terminal base as shown

in Figure 1.

Figure 1. Connecting FieldPoint Terminal Bases

2. Place the FieldPoint AI module on top of the calibration terminal base.

3. Connect the bank to the host computer using an RS-232 cable.

4. Select the appropriate baud rate that your computer supports on the

network interface module. Table 4 shows the available baud rates.

The default baud rate for the FP-1000 is 115,200, which provides the

fastest performance. You do not need to change this setting unless you

experience communications problems.

Protective

Cover

Local Bus Connectors

Firmly Mated

©National Instruments Corporation 7 Calibrating FieldPoint AI Modules with Calibration Executive

Table 4. Baud Rate Switch Settings for the FP-1000/1001

Switch Positions 6–8 Network Module Baud Rate

300

1,200

2,400

9,600

19,200

38,400

57,600

115,200

123 4 5678

Calibrating FieldPoint AI Modules with Calibration Executive 8 ni.com

5. Connect the positive wire of the power supply into the first V terminal

of the network module. Connect the negative wire of the power supply

into the first C terminal of the FP-1000 network module (see Figure 2).

Figure 2. FP-1000/1001 Power Connector Pinout

6. Launch FieldPoint Explorer.

7. Expand the + directory tree, which is on the left side of the FieldPoint

Explorer window (see Figure 3).

Figure 3. FieldPoint Explorer

8. Right-click the FieldPoint icon and select Add a comm resource to

this server.

9. In the Comm Resource Configuration dialog box, which is shown in

Figure 4, select the port to which the FieldPoint system is connected.

Make sure the baud rate matches what the network module is set to use,

then click Find Devices.

–

To DC V Power Supply

Figure 4. Comm Resource Configuration

10. Expand the view to show the devices found on the network, as shown

in Figure 5. If you do not see the module that you want to calibrate, the

network module is not communicating correctly with either the host or

the FieldPoint module.

Figure 5. Expanding the View of the + Directory Tree

11. Close FieldPoint Explorer before you go on to the next section. You do

not need to save the new comm resource.

Calibrating FieldPoint AI Modules with Calibration Executive 10 ni.com

Caution Yo u must close FieldPoint Explorer and keep it closed during the remainder of

this procedure to prevent a system crash.

Connecting the Calibrator to an FP-TC-120 Module

If you are calibrating the FP-TC-120, make the following connections as

showninFigure6:

1. Connect the positive output (voltage) of the calibrator to terminal 1 of

the calibration terminal base

2. Connect the negative output (voltage) of the calibrator to terminal 2 of

the calibration terminal base.

Figure 6. FP-TC-120 Connections to Calibrator

1 FP-1000 Network Module

2 TB-Cal Calibration Terminal Base

3 Connect to positive output (voltage) of calibrator

4 Connect to negative output (voltage) of calibrator

5 Connect to DC V power supply

6 Connect RS-232 serial cable to COM port

7 Baud Rate Switches

67892345 141516V10 11 12 13V1

22 23 24 2518 19 20 21 30 31 32 C26 27 28 29C17

3 4

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