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.
371111A-01 Copyright ©2001 National Instruments Corp.All rights reserved. March2001
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
®
1
3
2
©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
W2 W3 W4
W2 W3 W4
1 2 3
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
AB
AB
1
2
3
AB
R0
R1
R2
AB
©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
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Pin
Number
Signal
Name
Column
ABC
Signal
Name
CGND
OUTPUT
AOREF
GUARD
DTEMP
MTEMP
+5 V
CGND
CGND
CGND
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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