National Instruments NI PXI-5122 Calibration Procedure
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National Instruments NI PXI-5122 Calibration Procedure

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CALIBRATION PROCEDURE
NI 5122/5124/5142
This document contains information for calibrating NI 5122/5124/5142 high-speed digitizers.
For more information on calibration, visit
Contents
Software Requirements............................................................................................................. 1
Documentation Requirements .................................................................................................. 2
Password .................................................................................................................................. 2
Calibration Interval................................................................................................................... 3
Test Equipment......................................................................................................................... 3
Test Conditions......................................................................................................................... 3
Calibration Procedures ............................................................................................................. 4
Initial Setup....................................................................................................................... 4
Self-Calibration ................................................................................................................ 4
MAX......................................................................................................................... 4
NI-SCOPE Soft Front Panel ..................................................................................... 5
NI-SCOPE ................................................................................................................ 5
Verification....................................................................................................................... 5
Vertical Offset and Vertical Gain Accuracy............................................................. 6
Programmable Vertical Offset Accuracy ................................................................. 17
Timing Accuracy ...................................................................................................... 22
Bandwidth and Flatness............................................................................................ 26
Trigger Sensitivity .................................................................................................... 34
Adjustment........................................................................................................................ 39
Appendix A: Calibration Options............................................................................................. 42
Complete Calibration........................................................................................................ 43
Optional Calibration ......................................................................................................... 43
Appendix B: Calibration Utilities............................................................................................. 45
MAX................................................................................................................................. 45
NI-SCOPE ........................................................................................................................ 45
Worldwide Support and Services ............................................................................................. 45

Software Requirements

Calibrating the NI 5122/5124/5142 requires installing NI-SCOPE on the calibration system.
Refer to Table 1 for the hardware-specific version to use with your device. You can download
the NI-SCOPE instrument driver from the Instrument Driver Network Web site at ni.com/
idnet. NI-SCOPE supports programming a Self-Calibration and an External Calibration in the
LabVIEW and C application development environments (ADEs). When you install NI- SCOPE,
you only need to install support for the ADE that you intend to use.
ni.com/calibration
.

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  • Page 1: Table Of Contents

    CALIBRATION PROCEDURE NI 5122/5124/5142 This document contains information for calibrating NI 5122/5124/5142 high-speed digitizers. For more information on calibration, visit ni.com/calibration Contents Software Requirements......................1 Documentation Requirements ....................2 Password ..........................2 Calibration Interval........................3 Test Equipment......................... 3 Test Conditions......................... 3 Calibration Procedures ......................

  • Page 2: Documentation Requirements

    For the locations of files you may need to calibrate your device, refer to the NI High-Speed Digitizers Help, which is available on the NI-SCOPE DVD and from ni.com/manuals Table 1. Required Software for NI 5122/5124/5142 Calibration Device NI-SCOPE Version NI PXI-5122 2.5 or later NI PCI-5122 2.6 or later NI PXIe-5122 3.3.1 or later NI PXI/PCI-5124 2.7 or later...

  • Page 3: Calibration Interval

    NI 5122/5124/5142. You should adjust the recommended calibration interval based on the measurement accuracy demands of your application. Test Equipment National Instruments recommends that you use the equipment in Table 2 for calibrating the NI 5122/5124/5142. The delay times indicated in this procedure apply specifically to the Fluke Note 9500B calibrator.

  • Page 4: Calibration Procedures

    • Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry is at a stable operating temperature. Unless manually disabled, the NI-SCOPE driver automatically loads with the operating system and enables the device. This warm-up time ensures the digitizer is at a stable operating temperature.

  • Page 5: Ni-Scope Soft Front Panel

    If any of these tests fail immediately after you perform an external Note adjustment, make sure that you have met the requirements listed in the Test Equipment Test Conditions sections before you return the digitizer to National Instruments for repair. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 5...

  • Page 6: Vertical Offset And Vertical Gain Accuracy

    Vertical Offset and Vertical Gain Accuracy Table 3 contains the input parameters for verifying both vertical offset accuracy and vertical gain accuracy of the digitizer. To verify vertical offset accuracy, complete the procedures described in the Vertical Offset Accuracy section for each of the 39 iterations in Table 3 for channel 0, then repeat the procedures for channel 1.
  • Page 7 35,000,000 60,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 1 MΩ 20,000,000 20,000,000 NI 5122/5124/5142 Calibration Procedure | © National Instruments | 7...
  • Page 8 Vertical Offset Accuracy Complete the following steps to verify vertical offset accuracy of the NI 5122/5124/5142. You must verify both channels with each iteration in Table 3. Open a session and obtain a session handle using the niScope Initialize VI. Throughout the procedure, refer to the C/C++ function call parameters for the Note LabVIEW input values.
  • Page 9 100,000 Commit all the parameter settings to hardware using the niScope Commit VI. LabVIEW VI C/C++ Function Call Call with the niScope_Commit following parameter: vi: The instrument handle from niScope_init NI 5122/5124/5142 Calibration Procedure | © National Instruments | 9...
  • Page 10 Short-circuit the channel 0 input of the digitizer by connecting the calibrator test head directly to the digitizer and grounding the output of the calibrator. Wait 500 ms for the calibrator to ground its output. Initiate a waveform acquisition using the niScope Initiate Acquisition VI. LabVIEW VI C/C++ Function Call Call...
  • Page 11 Published Calibration Published Test Limits Specifications Test Limits Specifications Range ±0.0008 ±0.0013 ±0.0013 ±0.0018 ±0.0008 ±0.0013 ±0.0013 ±0.0018 ±0.0011 ±0.0015 ±0.0016 ±0.0021 ±0.0011 ±0.0015 ±0.0016 ±0.0021 ±0.00575 ±0.01 ±0.005 ±0.010 NI 5122/5124/5142 Calibration Procedure | © National Instruments | 11...
  • Page 12 Table 5. NI 5124 Vertical Offset Limits (Continued) NI PXI-5124 NI PCI-5124 Calibration Published Calibration Published Test Limits Specifications Test Limits Specifications Range ±0.00575 ±0.01 ±0.005 ±0.01 ±0.00575 ±0.01 ±0.005 ±0.01 Table 6. NI 5142 Vertical Offset Limits NI PXI-5142 NI PCI-5142 Calibration Published...
  • Page 13 The instrument handle from niScope_init channelList: "0" range: The Range value in Table 3 for the current iteration offset: enabled: NISCOPE_VAL_TRUE Configure the horizontal properties using the niScope Configure Horizontal Timing VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 13...
  • Page 14 LabVIEW VI C/C++ Function Call Call niScope_Configure with HorizontalTiming the following parameters: enforceRealtime: NISCOPE_VAL_TRUE numRecords: vi: The instrument handle from niScope_init minSampleRate: 10,000,000 refPosition: 50.0 minNumPts: 100,000 Commit all the parameter settings to hardware using the niScope Commit VI. LabVIEW VI C/C++ Function Call Call with...
  • Page 15 VI. This value is the Measured Negative Voltage used in step 14. LabVIEW VI C/C++ Function Call Call niScope_FetchMeasureme with the following parameters: timeout: vi: The instrument handle from niScope_init channelList: "0" scalarMeasFunction: NISCOPE_ VAL_VOLTAGE_AVERAGE NI 5122/5124/5142 Calibration Procedure | © National Instruments | 15...
  • Page 16 14. Calculate the error in the vertical gain as a percentage of input using the following formula:     –  error ----------- - –     – where a = the Measured Positive Voltage b = the Measured Negative Voltage c = the applied Positive Voltage d = the applied Negative Voltage Compare the resulting percent error to the Calibration Test Limits or the Published...

  • Page 17: Programmable Vertical Offset Accuracy

    The device name assigned by MAX idQuery: VI_FALSE resetDevice: VI_TRUE Configure the input impedance and the maximum input frequency using the niScope Configure Chan Characteristics VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 17...
  • Page 18 LabVIEW VI C/C++ Function Call Call niScope_ConfigureChan with the Characteristics following parameters: vi: The instrument handle from niScope_init channelList: "0" inputImpedance: NISCOPE_VAL_1_MEG_OHM maxInputFrequency: (for 100,000,000 NI 5122/5142), (for NI 5124) 150,000,000 Configure the common vertical properties using the niScope Configure Vertical VI. LabVIEW VI C/C++ Function Call Call...
  • Page 19 Fetch a waveform from the digitizer and perform a voltage average measurement using the niScope Fetch Measurement (poly) VI. Select the Measurement Scalar DBL instance of the VI. This value is the Measured Positive Voltage used in step 16. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 19...
  • Page 20 LabVIEW VI C/C++ Function Call Call niScope_FetchMeasuremen with the following parameters: timeout: vi: The instrument handle from niScope_init channelList: "0" scalarMeasFunction: NISCOPE_VAL_VOLTAGE_AVE RAGE 10. Set the calibrator to output -0.75 V. 11. Configure the common vertical properties using the niScope Configure Vertical VI. LabVIEW VI C/C++ Function Call Call...
  • Page 21 Table 9. NI 5122/5142 Programmable Vertical Offset Accuracy Limits NI PXI/PXIe-5122 and NI PXI-5142 NI PCI-5122/5142 Calibration Test Published Calibration Test Published Limits Specifications Limits Specifications ±0.36% ±0.4% ±0.36% ±0.5% NI 5122/5124/5142 Calibration Procedure | © National Instruments | 21...

  • Page 22: Timing Accuracy

    Table 10. NI 5124 Programmable Vertical Offset Accuracy Limits Calibration Test Limits Published Specifications ±0.36% ±0.4% 17. Move the calibrator test head to the digitizer input channel 1 and repeat steps 2 through 16, changing the value of the channelList parameter from "0"...
  • Page 23 Vertical parameters: coupling: NISCOPE_VAL_DC probeAttenuation: vi: The instrument handle from niScope_init channelList: "0" range: offset: enabled: NISCOPE_VAL_TRUE Configure the horizontal properties using the niScope Configure Horizontal Timing VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 23...
  • Page 24 LabVIEW VI C/C++ Function Call Call niScope_Configure with the HorizontalTiming following parameters: enforceRealtime: NISCOPE_VAL_TRUE numRecords: vi: The instrument handle from niScope_init minSampleRate: 100,000,000 refPosition: 50.0 minNumPts: 1,000,000 Commit all the parameter settings to hardware using the niScope Commit VI. LabVIEW VI C/C++ Function Call Call with...
  • Page 25 ±5.3 ppm ±25 ppm The same time source is used for both channel 0 and channel 1, so you only Note need to verify the timing accuracy on one channel. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 25...

  • Page 26: Bandwidth And Flatness

    12. End the session using the niScope Close VI. LabVIEW VI C/C++ Function Call Call with the niScope_close following parameter: vi: The instrument handle from niScope_init You have finished verifying the timing accuracy of the NI 5122/5124/5142. Bandwidth and Flatness Complete the following steps to verify the bandwidth and flatness of the NI 5122/5124/5142.
  • Page 27 The Range value in Table 12 (NI 5122/5142) or Table 13 (NI 5124) for the current iteration offset: enabled: NISCOPE_VAL_TRUE Configure the horizontal properties using the niScope Configure Horizontal Timing VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 27...
  • Page 28 LabVIEW VI C/C++ Function Call Call niScope_Configure with the HorizontalTiming following parameters: enforceRealtime: NISCOPE_VAL_TRUE numRecords: vi: The instrument handle from niScope_init minSampleRate: 10,000,000 refPosition: 50.0 minNumPts: 30,000 Commit all the parameter settings to hardware using the niScope Commit VI. LabVIEW VI C/C++ Function Call Call with the...
  • Page 29 Table 12 (NI 5122/5142) or Table 13 (NI 5124). Wait 2,500 ms for the impedance matching and frequency of the calibrator to settle. Initiate a waveform acquisition using the niScope Initiate Acquisition VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 29...
  • Page 30 LabVIEW VI C/C++ Function Call Call niScope_Initiate with the Acquisition following parameter: vi: The instrument handle from niScope_init Fetch a waveform from the digitizer and perform a voltage RMS measurement using the niScope Fetch Measurement (poly) VI. Select the Measurement Scalar DBL instance of the VI.
  • Page 31 100 MHz 50 Ω 20,100,000 -0.4 50,100,000 100,100,000 † † 100 MHz 1 MΩ 20,100,000 -0.4 40,100,000 † † 80,100,000 100 MHz 1 MΩ 20,100,000 -0.4 50,100,000 † † 100,100,000 NI 5122/5124/5142 Calibration Procedure | © National Instruments | 31...
  • Page 32 Table 12. NI 5122/5142 Bandwidth and Flatness Stimuli and Published Specifications (Continued) NI 5122/5142 Published Specifications Input Max Input Input Range Frequency Level Level Iteration Frequency Impedance (Hz) (dB) (dB) 35 MHz 50 Ω 16,000,000 -1.2 32,000,000 -1.6 † † 35,000,000 20 MHz 50 Ω...
  • Page 33 † Warranted value. Other values are typical. For definitions of warranted specifications and typical specifications, refer to the NI PXI/PCI-5124 Specifications document available online at ni.com/manuals. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 33...

  • Page 34: Trigger Sensitivity

    Trigger Sensitivity Complete the following steps to verify the trigger sensitivity of the NI 5122/5124/5142. You must verify channel 0, channel 1, and the external trigger channel using the corresponding iterations in Table 14. Open a session and obtain a session handle using the niScope Initialize VI. LabVIEW VI C/C++ Function Call Call...
  • Page 35 The instrument handle from niScope_init minSampleRate: 100,000,000 refPosition: 50.0 minNumPts: 1,000 Configure an edge trigger using the niScope Configure Trigger (poly) VI. Select the Analog Edge Ref Trigger instance of the VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 35...
  • Page 36 LabVIEW VI C/C++ Function Call Call niScope_Configure with the following TriggerEdge parameters: triggerCoupling: NISCOPE_VAL_DC slope: The Slope value in Table 14 for the current iteration vi: The instrument handle from niScope_init triggerSource: The Trigger Source value in Table 14 for the current iteration level: The Level value in Table 14 for the current iteration...
  • Page 37 14. End the session using the niScope Close VI. LabVIEW VI C/C++ Function Call Call with the niScope_close following parameter: vi: The instrument handle from niScope_init You have finished verifying the trigger sensitivity for the NI 5122/5124/5142. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 37...
  • Page 38 Table 14. NI 5122/5124/5142 Trigger Sensitivity Inputs Calibrator Signal Trigger Level Iteration Source (mV) Slope NI 5122/5142 NI 5124 1.25 4.84 mV 6.84 mV NISCOPE_VAL_ pk-pk pk-pk 50 MHz sine 50 MHz sine POSITIVE wave with wave with -1.25 NISCOPE_VAL_ 50 Ω...

  • Page 39: Adjustment

    " ". Wait 2,500 ms for the impedance matching and frequency of the calibrator to settle. Adjust the vertical range using the niScope Cal Adjust Range VI. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 39...
  • Page 40 LabVIEW VI C/C++ Function Call Call niScope_CalAdjust with the following Range parameters: sessionHandle: The instrument handle from niScope_CalStart channelName: "1" range: stimulus: Ground the calibrator. Wait 500 ms for the calibrator to ground its output to channel 1 of the digitizer. Adjust the vertical range using the niScope Cal Adjust Range VI.
  • Page 41 NISCOPE_VAL_ACTION_STORE You have finished adjusting the NI 5122/5124/5142. It is not necessary to adjust each channel individually; however, you should repeat the entire verification procedure to verify a successful adjustment. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 41...

  • Page 42: Appendix A: Calibration Options

    Appendix A: Calibration Options External calibration involves verification and if necessary, adjustment and reverification. Adjustment is the process of measuring and compensating for device performance to improve the measurement accuracy. Performing an adjustment updates the calibration date, effectively resetting the calibration interval. The device is guaranteed to meet or exceed its published specifications for the duration of the calibration interval.

  • Page 43: Complete Calibration

    However, you cannot update the calibration date, because the device will not necessarily operate within the published specifications for an additional two years. NI 5122/5124/5142 Calibration Procedure | © National Instruments | 43...
  • Page 44 Regardless of the results of the first verification, if you choose to perform an Note adjustment, you must verify that the measurement error falls within the calibration test limits at the end of the calibration procedure. Figure 2 shows the programming flow for the optional calibration. Figure 2.

  • Page 45: Appendix B: Calibration Utilities

    A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer’s declaration of conformity. This system affords the user protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC NI 5122/5124/5142 Calibration Procedure | © National Instruments | 45...
  • Page 46 For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product.

This manual is also suitable for:

Ni pci-5122Ni pxie-5122Ni pxi-5124Ni pci-5124Ni pxi-142Ni pci-5142

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