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CALIBRATION PROCEDURE
NI PXI/PCI-5122
Contents
Conventions ............................................................................................ 2
Introduction ............................................................................................. 3
What Is Calibration? ........................................................................ 3
Self-Calibration ........................................................................ 3
External Calibration.................................................................. 3
Why Should You Calibrate? ............................................................ 3
How Often Should You Calibrate? .................................................. 4
Software and Documentation Requirements........................................... 4
Software ........................................................................................... 4
Documentation................................................................................. 6
Self-Calibration Procedures .................................................................... 6
MAX ................................................................................................ 6
Scope SFP ........................................................................................ 7
NI-SCOPE ....................................................................................... 7
External Calibration Options .................................................................. 8
Complete Calibration ....................................................................... 9
Optional Calibration ........................................................................ 10
External Calibration Requirements......................................................... 12
Test Equipment ................................................................................ 12
Test Conditions ................................................................................ 12
External Calibration Procedures ............................................................. 13
Verifying NI 5122 Specifications .................................................... 13
Vertical Offset and Vertical Gain Accuracy............................. 13
Programmable Vertical Offset Accuracy.................................. 19
Timing Accuracy ...................................................................... 21
Bandwidth and Flatness............................................................ 23
Trigger Sensitivity ........................................................................... 26
Adjusting the NI 5122...................................................................... 28
Calibration Utilities................................................................................. 30
MAX ................................................................................................ 30
NI-SCOPE ....................................................................................... 30
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Summary of Contents for National Instruments NI PCI-5122
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Page 1: Table Of Contents
CALIBRATION PROCEDURE NI PXI/PCI-5122 Contents Conventions .................... 2 Introduction ..................... 3 What Is Calibration? ................ 3 Self-Calibration ................ 3 External Calibration..............3 Why Should You Calibrate? ............3 How Often Should You Calibrate? ..........4 Software and Documentation Requirements........... 4 Software ................... -
Page 2: Conventions
Calibration Function References .............31 Technical Support Resources ..............31 NI Web Support................31 Worldwide Support ................31 Conventions The following conventions are used in this manual: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box. -
Page 3: Introduction
Calibration verifies that the digitizer still meets its specified accuracy and NI standards. If adjustments are necessary, calibration makes the adjustments to restore the accuracy of the digitizer. © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... -
Page 4: How Often Should You Calibrate
How Often Should You Calibrate? Self-calibration can be performed as necessary to compensate for environmental changes. Caution Although you can use self-calibration repeatedly, self-calibrating the NI 5122 more than a few times a day may cause excessive wear on the relays over time. The measurement accuracy requirements of your application determine how often you should externally calibrate the NI 5122. - Page 5 NI-SCOPE Function Reference Help or the NI-SCOPE VI Reference Help. These references can be found in the NI High-Speed Digitizers Help. To access this help file, go to Start»Programs»National Instruments» NI-SCOPE»Documentation»NI High-Speed Digitizers Help. Table 1. Calibration File Locations after Installing NI-SCOPE 2.6 or Later...
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Page 6: Documentation
Documentation You may find the following documentation helpful as you write your calibration procedure: • NI High-Speed Digitizers Getting Started Guide • NI High-Speed Digitizers Help • NI PXI/PCI-5122 Specifications • NI-SCOPE Function Reference Help or NI-SCOPE VI Reference Help These documents are installed when you install NI-SCOPE. -
Page 7: Scope Sfp
To initiate self-calibration from the Scope SFP, complete the following steps: Disconnect or disable any AC inputs to the digitizer. Launch the Scope SFP (Start»Programs»National Instruments» NI-SCOPE»Scope Soft Front Panel). Select the device you want to calibrate using the Device Configuration dialog box (Edit»Device Configuration). -
Page 8: External Calibration Options
External Calibration Options External calibration involves both adjustment and verification. 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 9: Complete Calibration
Verify Results Adjust (Cal Dates and Temperatures Updated) Document Post-Adjustment Verify Results Meets Calibration Test Limits? Review Verification/ Calibration/ Adjustment Procedure Verification or Return Device Complete Figure 1. Complete Calibration Programming Flow © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... -
Page 10: Optional Calibration
Optional Calibration You can choose to skip the adjustment steps of the calibration procedure if the measurement error is within the calibration test limits or the published specifications during the first verification. If all of the measurement errors determined during the first verification fall within the calibration test limits, the device is guaranteed to meet or exceed its published specifications for a full calibration interval. - Page 11 Adjust Adjust (Cal Dates and Anyway? Temperatures Updated) Verify Document 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/PCI-5122 Calibration Procedure...
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Page 12: External Calibration Requirements
External Calibration Requirements Test Equipment Table 2 lists the equipment required for externally calibrating the NI 5122. If you do not have the recommended instruments, use these specifications to select a substitute calibration standard. Table 2. Required Equipment Specifications for NI 5122 External Calibration Required Recommended Parameter... -
Page 13: External Calibration Procedures
NI 5122. To verify vertical offset accuracy, complete the procedures described in the Vertical Offset Accuracy section for each of the 39 iterations listed in © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... - Page 14 Table 3, then repeat the procedure for channel 1. The calibration test limits and published specifications are shown in Table 3. To verify vertical gain accuracy, complete the procedures described in the Vertical Gain Accuracy section for each of the 39 iterations listed in Table 3, then repeat the procedure for channel 1.
- Page 15 (niScope Configure Chan Characteristics VI) with the following parameters: • channelList: "0" • inputImpedance: The Input Impedance value for the current iteration from Table 3 • maxInputFrequency: The Maximum Input Frequency value for the current iteration from Table 3 © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure...
- Page 16 Call (niScope Configure niScope_ConfigureVertical Vertical VI) with the following parameters: • channelList: "0" • range: The Range value for the current iteration from Table 3 • offset: • coupling: NISCOPE_VAL_DC • probeAttenuation: • enabled: NISCOPE_VAL_TRUE Call (niScope Configure niScope_ConfigureHorizontalTiming Horizontal Timing VI) with the following parameters: •...
- Page 17 Vertical VI) with the following parameters: • channelList: "0" • range: The Range value for the current iteration from Table 3 • offset: • coupling: NISCOPE_VAL_DC • probeAttenuation: • enabled: NISCOPE_VAL_TRUE © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure...
- Page 18 Call (niScope Configure niScope_ConfigureHorizontalTiming Horizontal Timing VI) with the following parameters: • minSampleRate: 10,000,000 • minNumPts: 100,000 • refPosition: 50.0 • numRecords: • enforceRealtime: NISCOPE_VAL_TRUE Call (niScope Commit VI) with the following niScope_Commit parameter: • vi: The instrument handle you obtained from niScope_init Connect the calibrator test head directly to the channel 0 input of the digitizer and output the positive voltage from Table 5 that corresponds...
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Page 19: Programmable Vertical Offset Accuracy
• inputImpedance: NISCOPE_VAL_50_OHM • maxInputFrequency: 100,000,000 Call (niScope Configure niScope_ConfigureVertical Vertical VI) with the following parameters: • channelList: "0" • range: • offset: 0.75 • coupling: NISCOPE_VAL_DC • probeAttenuation: • enabled: NISCOPE_VAL_TRUE © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... - Page 20 Call (niScope Configure niScope_ConfigureHorizontalTiming Horizontal Timing VI) with the following parameters: • minSampleRate: 10,000,000 • minNumPts: 100,000 • refPosition: 50.0 • numRecords: • enforceRealtime: NISCOPE_VAL_TRUE Call (niScope Commit VI) with the following niScope_Commit parameter: • vi: The instrument handle you obtained from niScope_init Connect the calibrator test head directly to the channel 0 input of the digitizer and output 0.75 V with a 50 Ω...
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Page 21: Timing Accuracy
"0" • inputImpedance: NISCOPE_VAL_50_OHM • maxInputFrequency: 20,000,000 Call (niScope Configure niScope_ConfigureVertical Vertical VI) with the following parameters: • channelList: "0" • range: • offset: • coupling: NISCOPE_VAL_DC • probeAttenuation: • enabled: NISCOPE_VAL_TRUE © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... - Page 22 Call (niScope Configure niScope_ConfigureHorizontalTiming Horizontal Timing VI) with the following parameters: • minSampleRate: 100,000,000 • minNumPts: 1,000,000 • refPosition: 50.0 • numRecords: • enforceRealtime: NISCOPE_VAL_TRUE Call (niScope Commit VI) with the following niScope_Commit parameter: • vi: The instrument handle you obtained from niScope_init Connect the calibrator test head directly to the channel 0 input of the digitizer.
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Page 23: Bandwidth And Flatness
Wait 250 ms for the impedance matching of the calibrator to settle. Call (niScope Initiate niScope_InitiateAcquisition Acquisition VI) with the following parameter: • vi: The instrument handle you obtained from niScope_init © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure... - Page 24 Call (niScope Fetch niScope_FetchMeasurement Measurement VI) with the following parameters: • channelList: "0" • timeout: • scalarMeasFunction: NISCOPE_VAL_VOLTAGE_RMS Call (niScope Configure niScope_ConfigureHorizontalTiming Horizontal Timing VI) with the following parameters: • minSampleRate: 100,000,000 • minNumPts: 300,000 • refPosition: 50.0 • numRecords: •...
- Page 25 –3 at 35 MHz 35 MHz 50 Ω 20 MHz 15,100,000 –0.68 –2.72 –0.4 –3 20,100,000 –1.65 –4.35 –1.3 –4.7 You have finished verifying the bandwidth and flatness of the NI 5122. © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure...
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Page 26: Trigger Sensitivity
Trigger Sensitivity Complete the following steps using the entries for iterations 1 through 4 in Table 9 to verify trigger sensitivity for input channel 0. Call (niScope niScope_ConfigureChanCharacteristics Configure Chan Characteristics VI) with the following parameters: • channelList: "0" • inputImpedance: NISCOPE_VAL_50_OHM •... - Page 27 NISCOPE_VAL_POSITIVE pk-pk 50 MHz sine wave –1.25 mV NISCOPE_VAL_NEGATIVE with 50 Ω load impedance 1.25 mV 9.70 mV NISCOPE_VAL_POSITIVE pk-pk 100 MHz sine wave –1.25 mV NISCOPE_VAL_NEGATIVE with 50 Ω load impedance © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure...
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Page 28: Adjusting The Ni 5122
Table 9. Trigger Sensitivity Inputs (Continued) Iteration Trigger Source Level Slope Calibrator 1.25 mV 4.84 mV NISCOPE_VAL_POSITIVE pk-pk 50 MHz sine wave –1.25 mV NISCOPE_VAL_NEGATIVE with 50 Ω load impedance 1.25 mV 9.7 mV NISCOPE_VAL_POSITIVE pk-pk 100 MHz sine wave –1.25 mV NISCOPE_VAL_NEGATIVE with 50 Ω... - Page 29 Configure the calibrator to ground its output at channel 1. Call (niScope Cal Adjust Range VI) niScope_CalAdjustRange with the following parameters: • channelName: "1" • range: • stimulus: Disconnect or disable all inputs to the digitizer. © National Instruments Corporation NI PXI/PCI-5122 Calibration Procedure...
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Page 30: Calibration Utilities
Call (niScope Cal Self Calibrate VI) niScope_CalSelfCalibrate with the following parameters: • channelList: VI_NULL • option: VI_NULL 10. Call with the following parameters: niScope_CalEnd • sessionHandle: The instrument handle you obtained from niScope_CalStart • action: to save the results of the NISCOPE_VAL_ACTION_STORE calibration You have finished adjusting the NI 5122. - Page 31 Instruments»NI-SCOPE»Documentation). Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more.
- Page 32 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...