National Instruments SCXI-1121 User Manual
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National Instruments SCXI-1121 User Manual

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USER GUIDE
C
ALIBRATING THE
C
WITH
ALIBRATION
Contents
™
™
™
IVI
, National Instruments
, NI
herein are trademarks or trade names of their respective companies.
323050A-01
SCXI -1121
E
XECUTIVE
Introduction ............................................................................................. 2
What Is Calibration? ........................................................................ 2
Why Should You Calibrate? ............................................................ 2
How Often Should You Calibrate? .................................................. 2
Equipment and Other Test Requirements ............................................... 3
Test Equipment ................................................................................ 3
Connectors ................................................................................ 3
Documentation................................................................................. 4
Software ........................................................................................... 4
Test Conditions ................................................................................ 5
Calibration Procedures ............................................................................ 5
Configuring Your Module for Calibration....................................... 5
Configuring Gain Jumpers........................................................ 10
Configuring Filter Jumpers....................................................... 11
Configuring Excitation Jumpers ............................................... 11
Setting Up Your Module for Calibration ......................................... 14
Running the Calibration Procedure.................................................. 15
Technical Support Resources.................................................................. 19
NI Web Support ............................................................................... 19
Worldwide Support.......................................................................... 19
™
™
, ni.com
, and SCXI
are trademarks of National Instruments Corporation. Product and company names mentioned
Copyright © 2001 National Instruments Corp. All rights reserved.
™
March 2001

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Summary of Contents for National Instruments SCXI-1121

  • Page 1: Table Of Contents

    , 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. 323050A-01 Copyright © 2001 National Instruments Corp. All rights reserved.

  • Page 2: Introduction

    Introduction This document contains information and step-by-step instructions for loading and running a calibration procedure for the SCXI-1121 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.

  • Page 3: Equipment And Other Test Requirements

    If you do not have custom connection hardware, you may need the following connectors: • Terminal block such as the National Instruments SCXI-1320, SCXI-1327, or SCXI-1328 • SCXI-1349 shielded cable assembly, which includes an SH68-68-EP shielded cable and a cable adapter •...

  • Page 4: Documentation

    • SCXI Quick Start Guide • SCXI-1121 User Manual You can download these documents from the National Instruments Web site ni.com/manuals Software Complete the following steps to install Calibration Executive: Make sure that your computer and monitor are powered on and that you have installed Windows 2000/NT/Me/9x.

  • Page 5: Test Conditions

    Configuring Your Module for Calibration This section describes the analog input jumpers, gain jumpers, filter jumpers, and excitation jumpers on your SCXI-1121 module and explains how to configure these jumpers for calibration. Refer to Figure 1 and Figure 2 to locate the jumpers on the SCXI-1121 module.
  • Page 6 If you move any jumpers, be sure to restore them to their original positions after Note calibration. The SCXI-1121 has five digital signal connection jumpers and 45 analog configuration jumpers. The jumper configurations for each input channel and each excitation channel are similar—only the jumper numbers are different.
  • Page 7 Figure 1. SCXI-1121 Jumper Locator Diagram © National Instruments Corporation Calibrating the SCXI-1121 with Calibration Executive...
  • Page 8 Figure 2. SCXI-1121 Parts Locator Diagram Calibrating the SCXI-1121 with Calibration Executive ni.com...

  • Page 9: Configuring Digital Signal Connection Jumpers

    • • • Factory setting; • connects MISO to SERDATOUT. • • Factory setting • (Revision A and B modules only). • • Factory setting. • • • © National Instruments Corporation Calibrating the SCXI-1121 with Calibration Executive...

  • Page 10: Configuring Gain Jumpers

    1, 2, 5, 10, and 20. To change the gain setting of a specified channel on the module, move the appropriate jumper on your module to the position indicated in Table 3. Table 3. SCXI-1121 Gain Jumper Positions Gain Setting...

  • Page 11: Configuring Filter Jumpers

    Configuring Filter Jumpers Table 5 shows the filter jumper allocation on the SCXI-1121. Two filter bandwidths are available—10 kHz and 4 Hz. Always make sure to set both stages to the same bandwidth to ensure that you achieve the required bandwidth.
  • Page 12 W14 and W15 W22 and W23 W34 and W35 W46 and W47 Each excitation channel of your SCXI-1121 has two different current or voltage levels. Set a given channel to the following level modes: • in the current mode—0.150 or 0.4501 mA •...
  • Page 13 After selecting the excitation mode of operation you want—voltage or current—use Table 7 to set the level of operation of your SCXI-1121. Table 7. Excitation Level Jumper Selection Excitation 3.333 V or 0.150 mA Channel Jumpers (Factory Setting) 10 V or 0.450 mA W16 and W26 •...

  • Page 14: Setting Up Your Module For Calibration

    Remove the side plate of the SCXI chassis and the cover of the SCXI-1120/1120D module to access the potentiometers and jumpers. Install the SCXI-1121 in slot 1 of the SCXI chassis. Install the E Series DAQ device in your host computer.

  • Page 15: Connecting Your Calibrator, Dmm, And Scxi Module

    DMM, and SCXI-1121 module. The first connections are as follows: Connect all negative inputs of each SCXI-1121 channel together on the SCXI-1320, SCXI-1327, or SCXI-1328 terminal block. Connect all positive inputs of each channel together on the same terminal block.
  • Page 16 EX0+ EX0+ EGND0 CH1+ CH1– EX1+ EX1– EGND1 CH2+ CH2– EX2+ EX2– EGND2 CH3+ CH3– EX3+ EX3– EGND3 RSVD SCAL RSVD +5 V MTEMP CGND DTEMP Figure 4. SCXI-1121 Front Connector Pin Assignments Calibrating the SCXI-1121 with Calibration Executive ni.com...
  • Page 17 When you adjust the analog inputs of your SCXI-1121, refer to Table 8 for the potentiometer reference designators. Table 8. Calibration Potentiometers Reference Designators Input Channel Number Input Null Output Null When you adjust the excitation levels of your SCXI-1121, refer to Table 9 for the potentiometer reference designators.
  • Page 18 • Terminal Block—The SCXI terminal block that you are using • Channels to Verify and Adjust—The SCXI-1121 channels you are testing; refer to the Calibration Executive Software User Manual to learn how to perform verification only. When the procedure is loaded, click Run Procedure to begin. Follow any instructions you receive when prompted by Calibration Executive.

  • Page 19: Technical Support Resources

    Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more. Web support is available through the Technical Support section of ni.com...

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