NI FP-AI-100 Manual de usuario
FieldPoint™, National Instruments™,NI
™,and ni.com™are trademarks of National Instruments Corporation. Product and company names mentioned
herein are trademarks or trade names of their respective companies.
323124A-01 Copyright ©2001 National Instruments Corp. All rights reserved. July 2001
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
123 4 5678
123 4 5678
123 4 5678
123 4 5678
123 4 5678
123 4 5678
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.
VV
CC
+
–
To DC V Power Supply
©National Instruments Corporation 9 Calibrating FieldPoint AI Modules with Calibration Executive
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
VV
CC
5
3 4
1
2
6
7
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