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National Instruments NI PXI-5422 Calibration Procedure

National Instruments NI PXI-5422 Calibration Procedure

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CALIBRATION PROCEDURE
NI PXI-5422
Contents
Download from Www.Somanuals.com. All Manuals Search And Download.
This document contains step-by-step instructions for writing a calibration
procedure for the NI PXI-5422 arbitrary waveform generator.
Conventions ............................................................................................ 1
Introduction ............................................................................................. 2
What Is Calibration? ........................................................................ 2
Self-Calibration ........................................................................ 2
External Calibration.................................................................. 2
Why Should You Calibrate? ............................................................ 2
How Often Should You Calibrate? .................................................. 3
Software and Documentation Requirements........................................... 3
Software ........................................................................................... 3
Documentation................................................................................. 5
Self-Calibration Procedures .................................................................... 5
MAX ................................................................................................ 5
FGEN Soft Front Panel.................................................................... 6
NI-FGEN ......................................................................................... 6
External Calibration Options .................................................................. 7
Complete Calibration ....................................................................... 7
Optional Calibration ........................................................................ 9
External Calibration Requirements......................................................... 11
Test Equipment ................................................................................ 11
Test Conditions ................................................................................ 11
External Calibration Procedures ............................................................. 12
Writing Your Calibration Procedure................................................ 12
Calibration Procedures in LabVIEW........................................ 12
Calibration Procedures in LabWindows/CVI........................... 12
Calibration Procedures in C...................................................... 12
Verifying NI PXI-5422 Specifications ............................................ 13
Verifying the Oscillator Frequency Accuracy.......................... 15
Verifying the DC Gain and Offset Accuracy ........................... 17
Adjusting the NI PXI-5422.............................................................. 31
Initializing the External Calibration Session ............................ 35

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  • Page 1: Table Of Contents

    CALIBRATION PROCEDURE NI PXI-5422 This document contains step-by-step instructions for writing a calibration procedure for the NI PXI-5422 arbitrary waveform generator. Contents Conventions .................... 1 Introduction ..................... 2 What Is Calibration? ................ 2 Self-Calibration ................ 2 External Calibration..............2 Why Should You Calibrate? ............2 How Often Should You Calibrate? ..........

  • Page 2: Conventions

    Introduction This document contains instructions for calibrating the NI PXI-5422 arbitrary waveform generator. This calibration procedure is intended for metrology labs. It describes specific programming steps for writing an external calibration procedure for the NI PXI-5422.

  • Page 3: What Is Calibration

    Self-calibration can be performed as necessary to compensate for environmental changes. Caution Although you can use self-calibration repeatedly, self-calibrating the NI PXI-5422 more than a few times a day may cause excessive wear on the relays over time. © National Instruments Corporation NI PXI-5422 Calibration Procedure...

  • Page 4: Software And Documentation Requirements

    The output accuracy requirements of your application determine how often you should externally calibrate the NI PXI-5422. NI recommends that you perform a complete external calibration at least once every two years. You can shorten this interval based on the accuracy demands of your application.
  • Page 5 The calibration process is described in the Self-Calibration Procedures External Calibration Procedures sections, including step-by-step instructions on calling the appropriate calibration functions. © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 6: Documentation

    NI signal generators. The NI Signal Generators Help includes detailed information about the NI PXI-5422 and the NI-FGEN functions. You can access this help file by selecting Start»Programs»National Instruments»NI-FGEN» Documentation»NI Signal Generators Help. For the latest versions of NI documentation, refer to ni.com/manuals...

  • Page 7: Fgen Soft Front Panel

    Select the device that you want to calibrate using the Device Configuration dialog box (Edit»Device Configuration). Open the Calibration dialog box (Utility»Calibration). Click Perform self-calibration. NI-FGEN To self-calibrate the NI PXI-5422 programmatically using NI-FGEN, complete the following steps: Call (niFgen Initialize VI) to open an NI-FGEN session niFgen_init using the following parameters: •...

  • Page 8: External Calibration Options

    Complete Calibration Performing a complete calibration is the recommended way to guarantee that the NI PXI-5422 meets or exceeds its published specifications for a two-year calibration interval. At the end of the complete calibration procedure, you verify that the output error falls within the calibration test limits.
  • Page 9 Document Post-Adjustment Verify Results Meets Calibration Test Limits? Review Verification/ Calibration/ Adjustment Verification Procedure or Complete Return Device Figure 1. Complete Calibration Programming Flow © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 10: Optional Calibration

    In this case, you can update the calibration date, effectively resetting the calibration interval, without actually performing an adjustment. Refer to the Adjusting the NI PXI-5422 section for more information. If all of the output errors determined during the first verification fall within the published specifications, but not within the calibration test limits, adjustment is also optional.
  • Page 11 Document Verify Post-Adjustment Results Meets Calibration/ Calibration Verification Test Limits? Complete Review Verification/ Adjustment Procedure or Return Device Figure 2. Optional Calibration Programming Flow © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 12: External Calibration Requirements

    This section describes the test equipment and test conditions required for calibration. Test Equipment External calibration requires different equipment for each applicable specification. Refer to Table 2 for a list of equipment. Table 2. Equipment Required for Calibrating the NI PXI-5422 Applicable Minimum Recommended Instrument...

  • Page 13: External Calibration Procedures

    External Calibration Procedures The complete external calibration procedure consists of self-calibrating, verifying the performance of the NI PXI-5422, adjusting the calibration constants, and verifying again after the adjustments. In some cases, the complete calibration procedure may not be required. Refer to the...

  • Page 14: Verifying Ni Pxi-5422 Specifications

    Note If any of these tests fail immediately after you perform an external adjustment, verify that you have met the required test conditions before you return the NI PXI-5422 to NI for repair. Refer to Table 2 for information about which instrument to use for verifying each specification.
  • Page 15 NI PXI-5422 16-Bit 200 MS/s AWG ACCESS ACTIVE CH 0 PFI 0 PFI 1 Figure 3. NI PXI-5422 Front Panel Connectors © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 16: Verifying The Oscillator Frequency Accuracy

    This test verifies the frequency accuracy of the oscillator on the NI PXI-5422. The verification involves generating a 10 MHz sine wave with the NI PXI-5422 and measuring the sine wave frequency with one of the instruments from Table 2.
  • Page 17 • vi: The session handle returned from niFgen_init 10. Measure the frequency out of the NI PXI-5422. © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 18: Verifying The Dc Gain And Offset Accuracy

    Verifying the DC Gain and Offset Accuracy This test verifies the DC gain and offset accuracy of the NI PXI-5422 into a high-impedance load by generating a number of DC voltages and offsets, measuring the voltage with a DMM, and comparing the NI PXI-5422 to the error limits.
  • Page 19 (niFgen property node: Basic Operation»Output Impedance) using the following parameters: • vi: The session handle returned from niFgen_init • channelName: "0" • attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE • value: © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 20 10 • wfmHandle: The variable passed by reference through this parameter receives the value (waveform handle) that identifies the waveform created by this function (negative full-scale handle). NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 21 13. Repeat steps 14 through 24 for each of the 24 iterations listed in Table 4, changing the Gain value for each iteration. You can use Table 4 to record the results of these steps. © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 22 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 23 © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 24 The session handle returned from niFgen_init 17. Measure the DC voltage out of the NI PXI-5422. Record this value in the Measured Positive Full-Scale value column of Table 4. 18. Subtract the Ideal Positive Full-Scale value from the Measured Positive Full-Scale value and record the result under Error Positive Full-Scale.
  • Page 25 Published Specification, perform an external adjustment. Verifying the Main Analog Path Offset To verify the offset of the NI PXI-5422 main analog path, complete the following steps: Create an array of waveform samples for the mid-scale DC waveform (0 VDC).
  • Page 26 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 27 © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 28 • vi: The session handle returned from niFgen_init Measure the positive DC voltage out of the NI PXI-5422. Record the positive DC voltage out measurement in the Measured Positive Offset column of Table 5. Subtract the Ideal Positive Offset from the Measured Positive Offset and record the result under Error Positive Offset.
  • Page 29 If any of the errors are greater than the Calibration Test Limit or the Published Specification, perform an external adjustment. Verifying the Gain of the Direct Path To verify the gain of the NI PXI-5422 Direct path, complete the following steps: The offset is not adjustable for the Direct path.
  • Page 30 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 31 • vi: The session handle returned from niFgen_init Measure the positive DC voltage out of the NI PXI-5422. Record the positive DC voltage out measurement in the Measured Positive Full-Scale Value column of Table 6. Call...

  • Page 32: Adjusting The Ni Pxi-5422

    11. Measure the negative DC voltage out of the NI PXI-5422. Record the negative DC voltage out measurement in the Measured Negative Full-Scale Value column of Table 6. 12. Call (niFgen Abort Generation VI) to niFgen_AbortGeneration abort the waveform generation using the following parameter: •...
  • Page 33 NI-FGEN session to ensure that the device operates within its specifications. You must close an external calibration session by using (niFgen Close Ext Cal VI), as shown in Figure 4. niFgen_CloseExtCal © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 34 Adjust Direct Path Gain Initialize Oscillator Frequency Calibration Adjust Oscillator Frequency Initialize Calibration ADC Calibration Adjust Calibration ADC Close Ext Cal Session Figure 4. NI PXI-5422 External Calibration Procedure NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 35: Initializing The External Calibration Session

    Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • value: © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 36 (niFgen property node: Calibration»Pre-Amplifier Attenuation) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION • value: NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 37 (niFgen property node: Output Attributes»Analog Path) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_ANALOG_PATH • value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 38 Analog Filter Pre-Amplifier Iteration Enable Attenuation Current Configuration VI_FALSE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_0DB VI_FALSE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_3DB VI_FALSE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_6DB VI_FALSE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_9DB VI_FALSE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_OFF_12DB VI_TRUE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_0DB VI_TRUE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_3DB VI_TRUE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_6DB VI_TRUE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_9DB VI_TRUE NIFGEN_VAL_CAL_CONFIG_MAIN_PATH_FILTER_ON_12DB NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 39 NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION • value: The Pre-Amplifier Attenuation value for the current iteration from Table 7. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load: Call to set the gain DAC value niFgen_SetAttributeViInt32 (niFgen property node: Calibration»Gain DAC Value) using the...
  • Page 40 Wait 500 ms for the output to settle. m. Use the DMM to measure the voltage output of the device. This measurement is , which is used in step 8. measurement 2 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 41 (niFgen property node: Calibration»Post-Amplifier Attenuation) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION • value: © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 42 The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_ANALOG_FILTER_ENABLED • value: The Analog Filter Enable value for the current iteration from Table 8. NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 43 NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION • value: The Pre-Amplifier Attenuation value for the current iteration from Table 8. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load: Call to set the gain DAC value niFgen_SetAttributeViInt32 (niFgen property node: Calibration»Gain DAC Value) using...
  • Page 44 32000 • measuredOutputs: An array containing two elements—the two output voltages ( ) that measurement 0 measurement 1 you measured in the order that you measured them NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 45 Repeat steps 6 through 9 for each of the eight iterations listed in Table 9, changing the Analog Path, Post-Amplifier Attenuation, and Current Configuration values for each iteration. © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 46 • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION • value: The Post-Amplifier Attenuation value for the current iteration from Table 9 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 47 Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load: Call to set the offset DAC niFgen_SetAttributeViInt32 value (niFgen property node: Calibration»Offset DAC Value) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal •...
  • Page 48 (niFgen property node: Calibration»Offset DAC Value) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_OFFSET_DAC_VALUE • value: 32767 NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 49 (niFgen property node: Basic Operation»Output Enabled) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_OUTPUT_ENABLED • value: VI_TRUE © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 50 • vi: The session handle returned from niFgen_InitExtCal 11. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel connector into a high-impedance load: Call (niFgen niFgen_WriteBinary16AnalogStaticValue Write Binary 16 Analog Static Value VI) to set the main DAC value using the following parameters: •...
  • Page 51 Wait 500 ms for the output to settle. Use the DMM to measure the voltage output by the device. This measurement is , which is used in step 12. measurement 3 © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 52: Adjusting The Oscillator Frequency

    The session handle returned from niFgen_InitExtCal • channelName: "0" • attributeID: NIFGEN_ATTR_ARB_GAIN • value: Note You can adjust this value based on which measuring device you use. NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 53 200 MS/s and because there are 20 samples per cycle, the resulting waveform is a 10 MHz sine wave. The sample values of this waveform must fall between –1.0 and 1.0. © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 54 The measured frequency should converge on the desired frequency. If the measured frequency does not converge on the desired frequency within 16 iterations, a problem may exist with your measurement device or the NI PXI-5422. Call (niFgen Abort Generation VI)

  • Page 55: Adjusting The Calibration Adc

    The session handle returned from niFgen_InitExtCal Adjusting the Calibration ADC The NI PXI-5422 has an onboard calibration ADC that is used during self-calibration. Adjusting the calibration ADC involves characterizing the gain and offset associated with this ADC so that performing self-calibration results in an accurately calibrated device.
  • Page 56 • channelName: "0" • attributeID: NIFGEN_ATTR_OUTPUT_IMPEDANCE • value: 10. Call to enable the analog output niFgen_SetAttributeViBoolean (niFgen property node: Basic Operation»Output Enabled) using the following parameters: NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 57 ADC using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • numberOfReadsToAverage: © National Instruments Corporation NI PXI-5422 Calibration Procedure Download from Www.Somanuals.com. All Manuals Search And Download.
  • Page 58 The session handle returned from niFgen_InitExtCal 21. Wait 500 ms for the output to settle. 22. Use the DMM to measure the NI PXI-5422 voltage output directly into the DMM into a high-impedance load. This measurement is , which is used in step 32.
  • Page 59 The session handle returned from niFgen_InitExtCal 30. Wait 500 ms for the output to settle. 31. Use the DMM to measure the NI PXI-5422 voltage output directly into the DMM (into a high-impedance load). This measurement be , which is used in step 32.

  • Page 60: Closing The External Adjustment Session

    . This function discards NIFGEN_VAL_EXT_CAL_ABORT the new calibration constants and does not change any of the calibration data stored in the onboard EEPROM. NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 61: Calibration Utilities

    Calibration Utilities NI-FGEN supports several calibration utilities that allow you to retrieve information about adjustments performed on the NI PXI-5422, restore an external calibration, change the external calibration password, and store small amounts of information in the onboard EEPROM. You can retrieve some data using MAX or the FGEN SFP;...

  • Page 62: Ni-Fgen

    The utility functions include: • niFgen_RestoreLastExtCalConstants • niFgen_GetSelfCalSupported • niFgen_GetSelfCalLastDateAndTime • niFgen_GetExtCalLastDateAndTime • niFgen_GetSelfCalLastTemp • niFgen_GetExtCalLastTemp • niFgen_GetExtCalRecommendedInterval • niFgen_ChangeExtCalPassword • niFgen_SetCalUserDefinedInfo • niFgen_GetCalUserDefinedInfo • niFgen_GetCalUserDefinedInfoMaxSize NI PXI-5422 Calibration Procedure ni.com Download from Www.Somanuals.com. All Manuals Search And Download.

  • Page 63: Where To Go For Support

    Instruments trademarks. Other 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 ni.com/patents.
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