Table of Contents
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CALIBRATION PROCEDURE
NI USB-443x
Français
This document contains information about calibrating the National Instruments USB-4431 and
USB-4432. These devices are referred to in this document as NI USB-443x. For more information about
calibration, visit
Contents
Software Requirements........................................................................................................................ 2
Documentation Requirements.............................................................................................................. 2
Calibration Interval .............................................................................................................................. 2
Test Equipment .................................................................................................................................... 3
Test Conditions .................................................................................................................................... 4
Calibration Procedures......................................................................................................................... 4
Initial Setup.................................................................................................................................. 4
Changing Coupling on NI USB-443x Devices............................................................................ 5
Verification .................................................................................................................................. 6
Analog Input Performance Verification .............................................................................. 6
Analog Output Performance Verification............................................................................ 10
Timebase Frequency Accuracy Verification ....................................................................... 12
Adjustment................................................................................................................................... 13
Analog Input Adjustment..................................................................................................... 13
Analog Output Adjustment for the NI USB-4431 Device................................................... 16
Where to Go for Support ..................................................................................................................... 18
Deutsch
ni.com/manuals
ni.com/calibration
AI Offset Verification ................................................................................................. 6
AI AC Coupled Gain Accuracy Verification .............................................................. 7
AI DC Coupled Gain Accuracy Verification .............................................................. 8
AO Offset Verification for the NI USB-4431 Device ................................................ 10
AO Gain Verification for the NI USB-4431 Device .................................................. 11
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Related Manuals for National Instruments USB-443 Series
Summary of Contents for National Instruments USB-443 Series
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Page 1: Table Of Contents
CALIBRATION PROCEDURE NI USB-443x Français Deutsch ni.com/manuals This document contains information about calibrating the National Instruments USB-4431 and USB-4432. These devices are referred to in this document as NI USB-443x. For more information about calibration, visit ni.com/calibration Contents Software Requirements........................2 Documentation Requirements...................... -
Page 2: Software Requirements
These documents are installed with NI-DAQmx. You can also download the latest versions from the NI Web site at ni.com/manuals Calibration Interval National Instruments recommends a calibration interval of one year for the NI USB-443x. Adjust the recommended calibration interval based on the measurement accuracy demands of your application. NI USB-443x Calibration Procedure ni.com... -
Page 3: Test Equipment
Test Equipment Table 1 lists the equipment National Instruments recommends for calibrating the NI USB-443x. Table 1. Recommended Equipment Parameter Measured/ Equipment Recommended Model Adjusted Minimum Requirements Calibrator Fluke 5700A AI AC Coupled Frequency Range: 1 kHz Gain Voltage Range: up to 9 V AI DC Coupled AC Voltage Accuracy: ±... -
Page 4: Test Conditions
Test Conditions The following setup and environmental conditions are required to ensure the NI USB-443x meets published specifications: • Keep connections to the NI USB-443x as short as possible. Long cables and wires act as antennae, picking up extra noise that can affect measurements. Use 50 Ω... -
Page 5: Changing Coupling On Ni Usb-443X Devices
VIs. Perform the 30 seconds wait procedure described in this section when performing an AC-coupled acquisition after the device is powered on, and after calling any of the calibration adjustment VIs. © National Instruments Corporation NI USB-443x Calibration Procedure... -
Page 6: Verification
Verification This section provides instructions for verifying the NI USB-443x Specifications for gain, offset, and frequency accuracy. By completing this procedure, you can see how device accuracy has drifted over time, which helps you determine the appropriate calibration interval for your application. Note Limits in Tables 3, 4, 6, 8, 9, 11, 13, and 15 are for the specified calibration sample rates and temperatures, and are based on the March 2011 edition of the NI USB-443x Specifications. -
Page 7: Ai Ac Coupled Gain Accuracy Verification
Complete the following steps to verify AC coupled gain accuracy: Connect the output of the calibrator to the channel you want to verify on the device. Output a 1 kHz, 6.36 V AC signal from the calibrator. © National Instruments Corporation NI USB-443x Calibration Procedure... -
Page 8: Ai Dc Coupled Gain Accuracy Verification
Using Figure 2 as a guide, create and configure an AI voltage task on the NI USB-443x as shown in Table 5. Table 5. AI AC Coupled Gain Accuracy Verification Configuration for NI USB-443x Configuration Value Minimum value –10.0 Maximum value 10.0 Terminal configuration Pseudodifferential... - Page 9 9.018 –9 –9.018 –8.982 Repeat steps 1 through 5. In step 2, output –9 VDC instead of 9 VDC. Subtract the averaged value measured for 0 VDC from the –9 VDC measurement. © National Instruments Corporation NI USB-443x Calibration Procedure...
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Page 10: Analog Output Performance Verification
Compare the calculated value to the DC coupled gain accuracy limits. If verifying an NI USB-4431, compare the calculated value to the appropriate limits in Table 8. If verifying an NI USB-4432, compare the calculated value to the appropriate limits in Table 9. 10. -
Page 11: Ao Gain Verification For The Ni Usb-4431 Device
3.5 V amplitude. Subtract the value measured in step 6 of the AO Offset Verification for the NI USB-4431 Device procedure, and compare this value to the limits in Table 13. Stop and clear the AO task. © National Instruments Corporation NI USB-443x Calibration Procedure... -
Page 12: Timebase Frequency Accuracy Verification
Repeat steps 1 through 7. In step 3, set every element in the array to a value of –3.15 instead of 3.15. Compare the result to the limits in Table 13. Table 13. AO Gain Limits for NI USB-4431 Device Input Amplitude (One Year Limits) Device Output Amplitude (VDC) -
Page 13: Adjustment
Using Figure 3 as a guide, commit an AI voltage task on the NI USB-443x with the settings shown in Table 16. After the task is committed, clear the task and wait for 30 seconds. Figure 3. VI Showing How to Prepare a NI USB-443x for Analog Input Adjustment © National Instruments Corporation NI USB-443x Calibration Procedure... - Page 14 Table 16. AI Adjustment Configuration for NI USB-443x Configuration Value Minimum value –10.0 Maximum value 10.0 Terminal configuration Pseudodifferential Acquisition mode Continuous Rate 1000.0 Coupling Physical channel Dev_name/aix Dev_name is the name shown for the NI USB-443x in MAX. x refers to the channel number: 0:3 for the NI USB-4431, and 0:4 for the NI USB-4432.
- Page 15 The analog input of the device is now calibrated with respect to your external equipment. After calibrating the device, verify the analog input operation by repeating the Analog Input Performance Verification section. © National Instruments Corporation NI USB-443x Calibration Procedure...
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Page 16: Analog Output Adjustment For The Ni Usb-4431 Device
Analog Output Adjustment for the NI USB-4431 Device Complete the following steps to adjust the analog output of the NI USB-4431 device. Connect channel AO 0 on the device to the multimeter. Initialize the AO calibration using the DAQmx Initialize External Calibration VI as shown below. LabVIEW Block Diagram NI-DAQmx Function Call Call... - Page 17 The analog output of the device is now calibrated with respect to your external equipment. After calibrating the device, verify the analog output operation by repeating the Analog Output Performance Verification section. © National Instruments Corporation NI USB-443x Calibration Procedure...
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Page 18: Where To Go For Support
For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. Refer to the Export Compliance Information at ni.com/legal/ export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data.
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