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™,

 NI-DAQ™, and PXI 

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are trademarks of National Instruments Corporation. Product and company names 

mentioned herein are trademarks or trade names of their respective companies.

371403A-01 

©

 Copyright 1999 National Instruments Corp. All rights reserved. May 1999

6703/6704 A

NALOG

 O

UTPUT

 D

EVICE

 C

ALIBRATION

 

P

ROCEDURE

Version 1.0

Introduction: This Document’s Scope

The following procedure for verifying and calibrating the National 
Instruments 6703/6704 analog output products contains three main 
sections: 

Calibration Overview

. This introductory section tells you what 

calibration is, why you should calibrate, and how often you should do 
it. This section also explains internal and external calibration.

Equipment and Other Test Requirements

. This section describes what 

you need to do before you can calibrate your device, including an 
overview of the test equipment, software, calibration functions, and 
environment needed for calibration. 

Calibration Process

. This section provides detailed step-by-step 

instructions for verifying and calibrating your device. 

This document does not cover programming technique or compiler 
configuration because of the number of programming languages and styles 
that can be used to perform calibration. However, the National Instruments 
data acquisition driver, NI-DAQ, has many online help files that contain 
compiler-specific instructions and detailed function explanations. You can 
add these help files when NI-DAQ is installed on your calibration 
computer.

Summary of Contents for 6703

Page 1: ...it This section also explains internal and external calibration Equipment and Other Test Requirements This section describes what you need to do before you can calibrate your device including an over...

Page 2: ...of your application indicate how often the 6703 6704 products need to be calibrated to maintain accuracy National Instruments recommends that you perform a complete calibration at least once every ye...

Page 3: ...the calibration and verification process to approximately 10 minutes However manual calibration and verification can take as long as 1 hour You can automate the adjustment and verification procedure i...

Page 4: ...e detailed information on using the NI DAQ driver The function reference manual includes information on the functions in the driver The user manual provides instructions on installing and configuring...

Page 5: ...edure The calibration procedure in the Calibration Process section later in this document provides step by step instructions on calling the appropriate calibration functions These calibration function...

Page 6: ...as by picking up extra noise that would affect calibration Maintain the temperature between 18 28 C Keep relative humidity below 80 Use shielded copper wire for all cable connections to the device It...

Page 7: ...his procedure can be easily expanded to verify all the voltage channels by performing the procedure once for each voltage channel To do this perform the procedure once for each value of the channel pa...

Page 8: ...he procedure once for each value of the channel parameter from 16 to 31 You will also need to connect the appropriate channel to your multimeter each time you repeat the procedure See the PCI PXI 6703...

Page 9: ...make offset and gain adjustments You perform offset adjustment first followed by gain adjustment You will then perform both offset and gain adjustment again to ensure proper accuracy This second set...

Page 10: ...the voltage on voltage channel 0 Decreasing the voltage value will increase the magnitude of the voltage on voltage channel 0 You have now calibrated the voltage output Calibrating Current Output 6704...

Page 11: ...on current channel 16 Decreasing the voltage value will increase the magnitude of the current on current channel 16 You have now calibrated the current output Saving Calibration Values Once you comple...

Page 12: ...ng tables are the specifications you should use when calibrating and verifying the 6703 6704 The tables show the specifications for 1 year and 24 hour calibration intervals Using the Tables The follow...

Page 13: ...r Limit V Lower Limit V Upper Limit V 0 0 0 0003125 0 0003125 0 0003125 0 0003125 10 0 9 9992675 10 0007325 9 9990975 10 0009025 Table 2 Current Output Specifications 6704 Only Test Point Value mA 24...

Page 14: ...r additional information on the software structure Voltage Output Verification Figure 1 Voltage Output Verification Look at the 6703 6704 specification table to determine the appropriate ranges for th...

Page 15: ...tput Verification 6704 Only Look at the 6703 6704 specification table to determine the appropriate ranges for the voltages and currents to be verified Get_Cal_Date deviceNumber Connect the multimeter...

Page 16: ...IBRATION_ENABLE ND_YES AO_VWrite deviceNumber 0 0 0 AO_VWrite deviceNumber 0 10 0 6703 AO_VWrite deviceNumber 16 voltage Adjust voltage until the DMM reads 10 0 V 6704 AO_VWrite deviceNumber 32 voltag...

Page 17: ...6704 Only AO_VWrite deviceNumber 16 0 1 Connect the multimeter to current channel 16 AO_VWrite deviceNumber 33 voltage Adjust voltage until the DMM reads 0 1 mA AO_VWrite deviceNumber 35 voltage Adju...

Page 18: ...libration Procedure 18 www natinst com Saving Calibration Values Figure 5 Saving Calibration Values Set_DAQ_Device_Info deviceNumber ND_CALIBRATION_ENABLE ND_NO AO_Calibrate deviceNumber 2 1 Copy_Cal...

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