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6703/6704 A
P
ROCEDURE
Version 1.0
Introduction: This Document's Scope
natinst.com
CVI™, LabVIEW™,
mentioned herein are trademarks or trade names of their respective companies.
371403A-01
O
NALOG
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
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.
™, NI-DAQ™, and PXI ™ are trademarks of National Instruments Corporation. Product and company names
© Copyright 1999 National Instruments Corp. All rights reserved.
D
UTPUT
EVICE
Requirements. This section describes what
C
ALIBRATION
May 1999
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Summary of Contents for National Instruments 6703
- Page 1 CVI™, LabVIEW™, ™, NI-DAQ™, and PXI ™ 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.
-
Page 2: Calibration Overview
All the output and calibration channels get scanned and refreshed together. The outputs of the calibration channels for the 6703 and 6704 are continuously compared to the onboard reference, and the 16-bit DAC’s offset and gain are adjusted to minimize the errors of the calibration channels. -
Page 3: External Calibration
DAC. This ensures that the output voltages and currents fall within the board specifications. Because of the 6703/6704 calibration circuitry, the only calibration adjustment you must make is to adjust the values of the calibration channels to account for time- or temperature-related drift of the onboard reference. - Page 4 For the 6703/6704 calibration procedure, you will need the latest version of the National Instruments NI-DAQ driver installed on the calibration system. This driver, which configures and controls the DAQ device, is available at www.natinst.com...
- Page 5 Configuring Your Board in NI-DAQ NI-DAQ automatically detects all 6703/6704 devices. However, to communicate with the boards, they must be configured in NI-DAQ. The following steps briefly explain how to configure NI-DAQ. Refer to the board user manual for detailed installation instructions. You can install this manual when NI-DAQ is installed.
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Page 6: Recommended Test Equipment
If you do not have custom connection hardware, you may need a connector block such as the National Instruments CB-68 and a cable such as the SH6868-D1. These components give you easy access to the individual pins on the 68-pin board I/O connector. - Page 7 This procedure checks the operation of the board by verifying that the output of voltage channel zero is within specifications. Because of the channel-to-channel matching of the 6703/6704 voltage channels, if voltage channel zero is operating within specifications, all the voltage channels should be operating within specifications.
- Page 8 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-6703/6704 User Manual for the pin numbers corresponding to each channel. To verify current output, make sure that you have read the...
- Page 9 You have now verified the current output of your board. Calibrating Your Board The 6703/6704 calibration procedure allows you to adjust the output calibration constants. At the end of each calibration procedure, these new constants will be stored in the user calibration area, ensuring that the board stores a permanent record of the calibration constants.
- Page 10 Set_DAQ_Device_Info and infoValue set to . This step ND_CALIBRATION_ENABLE ND_YES configures the board so you can access the calibration channels. Connect the DMM to the board as shown in the following table. 6703/6704 Calibration Procedure www.natinst.com...
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Page 11: Saving Calibration Values
To save the calibration constants and update the calibration dates, follow these steps: with operation set to and calibrationArea set AO_Calibrate . This stores the new calibration constants in the user calibration area of the board EEPROM. © National Instruments Corporation 6703/6704 Calibration Procedure... -
Page 12: Specifications
Specifications The following 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 following definitions describe how to use the specification tables in this section. - Page 13 Table 2. Current Output Specifications (6704 Only) 24-Hour Ranges 1-Year Ranges Test Point Lower Limit Upper Limit Lower Limit Upper Limit Value (mA) (mA) (mA) (mA) (mA) 0.0996875 0.1003125 0.0996875 0.1003125 19.998515 20.001485 19.993795 20.006205 © National Instruments Corporation 6703/6704 Calibration Procedure...
- Page 14 Flowcharts These flowcharts show the appropriate NI-DAQ function calls for verifying and calibrating your 6703/6704 board. Refer to the Calibration Process section of this document, the NI-DAQ Function Reference Manual for PC Compatibles, and the NI-DAQ User Manual for PC Compatibles for additional information on the software structure.
- Page 15 Current Output 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 to channel current channel 16. AO_VWrite(deviceNumber,16,voltage) Verify that the current read by the multimeter is within range.
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Page 16: Voltage Output Calibration
Set_DAQ_Device_Info(deviceNumber,ND_CALIBRATION_ENABLE,ND_YES) Connect the multimeter to channel voltage channel 0. AO_VWrite(deviceNumber,0,0.0) 6703: AO_VWrite(deviceNumber,16,voltage) Adjust voltage until the DMM reads 10.0 V. 6704: AO_VWrite(deviceNumber,32,voltage) Adjust voltage until the DMM reads 10.0 V. AO_VWrite(deviceNumber,0,10.0) 6703: AO_VWrite(deviceNumber,17,voltage) Adjust voltage until the DMM reads 10.0 V. -
Page 17: Current Output Calibration
Connect the multimeter to current channel 16. AO_VWrite(deviceNumber,16,0.1) AO_VWrite(deviceNumber,33,voltage) Adjust voltage until the DMM reads 0.1 mA. AO_VWrite(deviceNumber,16,20.0) AO_VWrite(deviceNumber,35,voltage) Adjust voltage until the DMM reads 20.0 mA. Figure 4. Current Output Calibration (6704 Only) © National Instruments Corporation 6703/6704 Calibration Procedure... - Page 18 Saving Calibration Values AO_Calibrate(deviceNumber,2,1) Set_DAQ_Device_Info(deviceNumber,ND_CALIBRATION_ENABLE,ND_NO) Copy_Cal(deviceNumber) Figure 5. Saving Calibration Values 6703/6704 Calibration Procedure www.natinst.com...
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