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CALIBRATION PROCEDURE
NI 5122/5124
Contents
Conventions ............................................................................................ 2
Introduction ............................................................................................. 2
Self-Calibration ........................................................................ 3
External Calibration.................................................................. 3
Calibration Interval................................................................... 3
Software and Documentation Requirements........................................... 3
Software ........................................................................................... 3
Documentation................................................................................. 5
Self-Calibration Procedures .................................................................... 5
MAX ................................................................................................ 6
Scope SFP ........................................................................................ 6
NI-SCOPE ....................................................................................... 6
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 5122/5124 Specifications ........................................... 13
Vertical Offset and Vertical Gain Accuracy............................. 13
Programmable Vertical Offset Accuracy.................................. 20
Timing Accuracy ...................................................................... 22
Bandwidth and Flatness............................................................ 24
Trigger Sensitivity ........................................................................... 29
Adjusting the NI 5122/5124 ............................................................ 31
Calibration Utilities................................................................................. 33
MAX ................................................................................................ 33
NI-SCOPE ....................................................................................... 34
Calibration Function References............................................................. 34
Where to Go for Support......................................................................... 34
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Table of Contents
Related Manuals for National Instruments 5124
Summary of Contents for National Instruments 5124
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Page 1: Table Of Contents
External Calibration Requirements............12 Test Equipment ................12 Test Conditions ................12 External Calibration Procedures ............. 13 Verifying NI 5122/5124 Specifications ........... 13 Vertical Offset and Vertical Gain Accuracy......13 Programmable Vertical Offset Accuracy........20 Timing Accuracy ..............22 Bandwidth and Flatness............24 Trigger Sensitivity ................ -
Page 2: Conventions
NI PXI/PCI-5124 digitizers. This calibration procedure is intended for metrology labs. This document describes specific programming steps for writing an external calibration procedure for the NI 5122/5124. The NI 5122/5124 supports two types of calibration: self-calibration (or internal calibration) and external calibration. NI 5122/5124 Calibration Procedure... -
Page 3: Self-Calibration
Caution Although you can use self-calibration repeatedly, self-calibrating the NI 5122/5124 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 5122/5124. - Page 4 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 2.7 or Later...
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Page 5: Documentation
NI Web site at ni.com/manuals Self-Calibration Procedures The NI 5122/5124 includes precise internal circuits and references used during self-calibration to adjust for time and temperature drift. The digitizer gain, offset, flatness, and trigger timing are all corrected in self-calibration. -
Page 6: Max
(Edit»Device Configuration). Launch the Calibration dialog box (Utility»Self Calibration). Click OK to begin self-calibration. NI-SCOPE To self-calibrate the NI 5122/5124 programmatically using NI-SCOPE, complete the following steps: Disconnect or disable any AC inputs to the digitizer. Call (niScope Initialize VI) to obtain an instrument niScope_init session handle. - Page 7 EEPROM. Therefore, you can include this procedure in any application that uses the digitizer. Call (niScope Close VI) to close the session handle. niScope_close Set the following parameter: • vi: The instrument handle you obtained from niScope_init © National Instruments Corporation NI 5122/5124 Calibration Procedure...
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Page 8: External Calibration Options
The Complete Calibration section describes the recommended calibration procedure. The Optional Calibration section describes alternative procedures that allow you to skip adjustment if the device already meets its calibration test limits or published specifications. NI 5122/5124 Calibration Procedure ni.com... -
Page 9: Complete Calibration
Complete Calibration Performing a complete calibration is the recommended way to guarantee that the NI 5122/5124 will meet or exceed its published specifications for a two-year calibration interval. At the end of the complete calibration procedure, you verify that the measurement error falls within the calibration test limits. -
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 5122/5124 section for more information. If all of the measurement errors determined during the first verification fall within the published specifications, but not within the calibration test limits, adjustment is also optional. - 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 5122/5124 Calibration Procedure...
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Page 12: External Calibration Requirements
Test Equipment Table 2 lists the equipment required for externally calibrating the NI 5122/5124. If you do not have the recommended instruments, use these specifications to select a substitute calibration standard. Table 2. Required Equipment Specifications for NI 5122/5124 External Calibration... -
Page 13: External Calibration Procedures
Note This section describes the program you must write to verify either the calibration test limits or the published specifications for the NI 5122/5124. Refer to the External Calibration Options section to determine which limits to use in these procedures. - Page 14 Table 3 for channel 0, then repeat the procedures for channel 1. The Calibration Test Limits and Published Specifications for vertical accuracy are shown in Table 4 (NI 5122) and Table 5 (NI 5124). 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 for channel 0, then repeat the procedures for channel 1.
- Page 15 Table 3. NI 5122/5124 Input Parameters for Vertical Offset Accuracy and Vertical Gain Accuracy Verification (Continued) Max Input Frequency (Hz) Input Iteration Impedance NI 5122 NI 5124 Range 1 MΩ 100,000,000 150,000,000 1 MΩ 100,000,000 150,000,000 1 MΩ 100,000,000 150,000,000 1 MΩ...
- Page 16 Compare the resulting average voltage to the value listed in the Calibration Test Limits column or the Published Specifications column in Table 4 (NI 5122) or Table 5 (NI 5124) that corresponds to the vertical range used. The inputImpedance and maxInputFrequency NI 5122/5124 Calibration Procedure ni.com...
- Page 17 ±0.008 ±0.0033 ±0.008 ±0.0033 ±0.008 ±0.0033 ±0.008 ±0.0039 ±0.01 ±0.0039 ±0.01 Table 5. NI 5124 Vertical Offset Calibration Test Limits and Published Specifications NI PXI-5124 NI PCI-5124 Calibration Test Published Calibration Test Published Range Limits (V) Specifications (V) Limits (V) Specifications (V) ±0.00080...
- Page 18 Connect the calibrator test head directly to the channel 0 input of the digitizer and output the positive voltage from Table 6 (NI 5122) or Table 7 (NI 5124) that corresponds to the vertical range used. Be sure to configure the load impedance of the calibrator to match the input impedance of the digitizer.
- Page 19 Compare the resulting percent error to the Calibration Test Limits or the Published Specifications listed in Table 6 (NI 5122) or Table 7 (NI 5124). If the result is within the selected test limit, the device has passed this portion of the verification.
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Page 20: Programmable Vertical Offset Accuracy
1 through 12 for every configuration in Table 3, replacing "0" with for the channelList parameter. "1" You have finished verifying the vertical gain accuracy of the NI 5122/5124. Programmable Vertical Offset Accuracy Complete the following steps to verify the programmable vertical offset accuracy for each digitizer channel. Call... - Page 21 12. Wait 750 ms for the output of the calibrator to settle. 13. Call (niScope Initiate niScope_InitiateAcquisition Acquisition VI) with the following parameter: • vi: The instrument handle you obtained from niScope_init © National Instruments Corporation NI 5122/5124 Calibration Procedure...
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Page 22: Timing Accuracy
Compare the resulting percent to the Calibration Test Limits or the Published Specifications listed in Table 8. If the result is within the selected test limit, the device has passed this portion of the verification. Table 8. NI 5122/5124 Programmable Vertical Offset Accuracy Calibration Test Limits Published Specifications ±0.36%... - Page 23 Compare the result to the Calibration Test Limits or the Published Specifications listed in Table 9. If the result is within the selected test limit, the device has passed this portion of the verification. Table 9. NI 5122/5124 Timing Accuracy Calibration Test Limits Published Specifications ±5.3 ppm...
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Page 24: Bandwidth And Flatness
You have finished verifying the timing accuracy of the NI 5122/5124. Bandwidth and Flatness Complete the following steps for each of the six configurations listed in Table 10 (NI 5122) or Table 11 (NI 5124) to verify the bandwidth and flatness for each digitizer channel. Call... - Page 25 11. Wait 500 ms for the output of the calibrator to settle. 12. Repeat steps 12a through 12d for each Input Frequency listed for the current iteration in Table 10 (NI 5122) or Table 11 (NI 5124). Configure the calibrator to output the Input Frequency for the current iteration from Table 10 (NI 5122) or Table 11 (NI 5124).
- Page 26 RMS voltage in step 8. If the result is within the test limits from Table 10 (NI 5122) or Table 11 (NI 5124), the device has passed this portion of the verification. Move the calibrator test head to the digitizer input channel 1 and repeat...
- Page 27 –1.2 32,100,000 1.27 –1.27 –1.6 36,100,000 –3 3 at –3 at 35 MHz 35 MHz 50 Ω 20 MHz 15,100,000 –3 –3 at 20 MHz 25,100,000 –3 –20 –3 at 20 MHz © National Instruments Corporation NI 5122/5124 Calibration Procedure...
- Page 28 Table 11. NI 5124 Bandwidth and Flatness Stimuli and Limits NI 5124 Calibration NI 5124 Published Test Limits Specifications Input Max Input Input Range Frequency Level Level Level Level Iteration Frequency Impedance (Hz) (dB) (dB) (dB) (dB) 50 Ω 150 MHz 20,100,000 0.33...
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Page 29: Trigger Sensitivity
• slope: The Slope value from Table 12 • triggerCoupling: NISCOPE_VAL_DC • holdoff: 0 • delay: 0 Note The trigger level is set to center the trigger hysteresis window at 0.0 V. © National Instruments Corporation NI 5122/5124 Calibration Procedure... - Page 30 12. Do not change the channelList inputs. Connect the calibrator test head to the external trigger channel (TRIG) in step 6. You have finished verifying the trigger sensitivity for the NI 5122/5124. Table 12. NI 5122/5124 Trigger Sensitivity Inputs Calibrator...
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Page 31: Adjusting The Ni 5122/5124
EXTERNAL NEGATIVE Adjusting the NI 5122/5124 If the NI 5122/5124 successfully passed each of the verification procedures within the calibration test limits, then an adjustment is recommended but not required to guarantee its published specifications for the next two years. - Page 32 3 and 10 in this section. Complete all of the following steps to externally adjust the NI 5122/5124. Connect the calibrator to the NI 5122/5124. ♦...
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Page 33: Calibration Utilities
NISCOPE_VAL_ACTION_STORE calibration You have finished adjusting the NI 5122/5124. It is not necessary to adjust each channel individually. However, you should repeat the entire verification procedure to verify a successful adjustment. Calibration Utilities... -
Page 34: Ni-Scope
NI-SCOPE VI Reference Help, both of which you can access from the NI High-Speed Digitizers Help (Start»Programs»National Instruments»NI-SCOPE»Documentation). Where to Go for Support The National Instruments Web site is your complete resource for technical support. At you have access to everything from ni.com/support troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers. - Page 35 South Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51, Taiwan 886 02 2377 2222, Thailand 662 992 7519, United Kingdom 44 0 1635 523545 © National Instruments Corporation NI 5122/5124 Calibration Procedure...
- Page 36 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.