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AO Waveform Calibration
Procedure for NI-DAQ mx
Contents
Conventions ............................................................................................ 2
Introduction ............................................................................................. 2
Software .................................................................................................. 3
Documentation ........................................................................................ 3
Test Equipment ....................................................................................... 4
Test Considerations................................................................................. 5
Calibration Process ................................................................................. 5
Calibration Process Overview ......................................................... 5
Initial Setup...................................................................................... 6
AO Verification Procedure .............................................................. 6
Analog Output Verification ...................................................... 6
Counter Verification ................................................................. 10
AO Adjustment Procedure............................................................... 12
AO Device Test Limits ........................................................................... 14
Using the Tables .............................................................................. 14
Range ........................................................................................ 14
Test Point .................................................................................. 14
24-Hour Ranges ........................................................................ 14
1-Year Ranges .......................................................................... 14
Counters.................................................................................... 14
NI 6711/6713-12-Bit Resolution................................................... 15
NI 6722/6723-13-Bit Resolution................................................... 15
NI 6731/6733-16-Bit Resolution................................................... 16
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Related Manuals for National Instruments NI-DAQ mx
Summary of Contents for National Instruments NI-DAQ mx
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Page 1: Table Of Contents
AO Waveform Calibration Procedure for NI-DAQ mx ™ Contents Conventions .................... 2 Introduction ..................... 2 Software ....................3 Documentation ..................3 Test Equipment ..................4 Test Considerations................. 5 Calibration Process ................. 5 Calibration Process Overview ............5 Initial Setup..................6 AO Verification Procedure .............. -
Page 2: Conventions
PCI/PXI/CompactPCI analog output (AO) devices. This document does not discuss programming techniques or compiler configuration. The National Instruments DAQmx driver contains help files that have compiler-specific instructions and detailed function explanations. You can add these help files when you install NI-DAQmx on the calibration computer. -
Page 3: Software
• The NI-DAQmx Help includes information about creating applications that use the NI-DAQmx driver. For more information about the device you are calibrating, refer to the Analog Output Series Help. © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx... -
Page 4: Test Equipment
AO GND AO EXT REF Calibrator Figure 1. Calibration Connections When performing calibration, National Instruments recommends that you use the following instruments for calibrating an AO device: • Calibrator—Fluke 5700A. If that instrument is unavailable, use a high-precision voltage source that is at least 50 ppm accurate for 12- and 13-bit boards and 10 ppm for 16-bit boards. -
Page 5: Test Considerations
AO Adjustment Procedure—Perform an external calibration that adjusts the device calibration constants with respect to a known voltage source. Perform another verification to ensure that the device is operating within its specifications after adjustment. © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx... -
Page 6: Initial Setup
These steps are described in detail in the following sections. Because a complete verification of all of the device’s ranges can take some time, you may wish to verify only the ranges of interest to you. Initial Setup NI-DAQmx automatically detects all AO devices. However, for the driver to communicate with the device, it must be configured in NI-DAQmx. - Page 7 AO 24 AO 24 (pin 17) AO GND (pin 51) AO 25 AO 25 (pin 16) AO GND (pin 50) AO 26 AO 26 (pin 49) AO GND (pin 15) © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx...
- Page 8 Table 2. Connecting the DMM to AO <8..31> on the NI 6723 (Continued) Output Channel DMM Positive Input DMM Negative Input AO 27 AO 27 (pin 14) AO GND (pin 48) AO 28 AO 28 (pin 13) AO GND (pin 47) AO 29 AO 29 (pin 46) AO GND (pin 12)
- Page 9 If the value is between these limits, the test is considered to have passed. Clear the acquisition using DAQmxClearTask (DAQmx Clear Task VI). NI-DAQ Function Call LabVIEW Block Diagram Call with the DAQmxClearTask following parameter: taskHandle: taskHandle © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx...
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Page 10: Counter Verification
Repeat steps 4 through 8 until all values have been tested. 10. Disconnect the DMM from AO 0, and reconnect it to the next channel, making the connections as shown in Table 1. 11. Repeat steps 4 through 10 until you have verified all channels. 12. - Page 11 Task VI). NI-DAQ Function Call LabVIEW Block Diagram Call with the following DAQmxClearTask parameter: taskHandle: taskHandle Disconnect the counter from your device. You have verified the counter on your device. © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx...
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Page 12: Ao Adjustment Procedure
AO Adjustment Procedure Use the AO adjustment procedure to adjust the analog output calibration constants. At the end of each calibration procedure, these new constants are stored in the external calibration area of the EEPROM. These values are password-protected, which prevents the accidental access or modification of any calibration constants adjusted by the metrology laboratory. - Page 13 After adjusting the device, you may want to verify the analog output operation. To do this, repeat the steps in the AO Verification Procedure section using the 24-hour test limits in the AO Device Test Limits section. © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx...
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Page 14: Ao Device Test Limits
AO Device Test Limits The tables in this section list the accuracy specifications to use when verifying and adjusting the NI 671X/672X/673X. The tables display the specifications for both 1-year and 24-hour calibration intervals. The 1-year ranges display the specifications that the devices should meet if it has been one year between calibrations. -
Page 15: Ni 6711/6713-12-Bit Resolution
9.9000000 9.8896747 9.9103253 9.8892582 9.9107418 –10 Neg FS –9.9000000 –9.9103253 –9.8896747 –9.9107418 –9.8892582 Table 7. NI 6722/6723 Counter Values Set Point (MHz) Upper Limit (MHz) Lower Limit (MHz) 5.0005 4.9995 © National Instruments Corporation AO Waveform Calibration Procedure for NI-DAQmx... -
Page 16: Ni 6731/6733-16-Bit Resolution
National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or...