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CALIBRATION PROCEDURE
NI 5412
Contents
Introduction .............................................................................................................................. 2
Software.................................................................................................................................... 2
Documentation.......................................................................................................................... 3
Password................................................................................................................................... 4
Calibration Interval................................................................................................................... 4
Test Equipment......................................................................................................................... 4
Test Conditions................................................................................................................. 5
Self-Calibration Procedures...................................................................................................... 5
MAX................................................................................................................................. 6
FGEN Soft Front Panel..................................................................................................... 6
NI-FGEN .......................................................................................................................... 6
External Calibration Options .................................................................................................... 7
Complete Calibration........................................................................................................ 8
Optional Calibration ......................................................................................................... 8
External Calibration Procedures............................................................................................... 10
Writing the Calibration Procedure.................................................................................... 10
Calibration Procedures in LabVIEW........................................................................ 10
Calibration Procedures in LabWindows/CVI........................................................... 10
Calibration Procedures in C...................................................................................... 10
Verifying NI 5412 Specifications..................................................................................... 10
Verifying the Oscillator Frequency Accuracy.......................................................... 12
Verifying the DC Gain and Offset Accuracy ........................................................... 14
Verifying the AC Voltage Amplitude Absolute Accuracy....................................... 22
Verifying Frequency Response (Flatness)................................................................ 25
Adjusting the NI 5412 ...................................................................................................... 28
Initializing the External Calibration Session ............................................................ 29
Adjusting the Analog Output.................................................................................... 30
Adjusting the Oscillator Frequency .......................................................................... 39
Adjusting the Calibration ADC ................................................................................ 42
Closing the External Adjustment Session ................................................................ 46
Calibration Utilities .................................................................................................................. 47
MAX................................................................................................................................. 47
FGEN SFP ........................................................................................................................ 47
NI-FGEN .......................................................................................................................... 47
Where to Go for Support .......................................................................................................... 48
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Summary of Contents for National Instruments 5412
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Page 1: Table Of Contents
Verifying the DC Gain and Offset Accuracy ............14 Verifying the AC Voltage Amplitude Absolute Accuracy........22 Verifying Frequency Response (Flatness)..............25 Adjusting the NI 5412 ...................... 28 Initializing the External Calibration Session ............29 Adjusting the Analog Output..................30 Adjusting the Oscillator Frequency ................ -
Page 2: Introduction
National Instruments. Software Calibrating the NI 5412 requires installing NI-FGEN version 2.3 or later on the calibration system. You can download NI-FGEN from the National Instruments web site at ni.com/ . NI-FGEN supports programming the... -
Page 3: Documentation
Documentation Consult the following documents for information about the NI PXI-5412, NI-FGEN, and your application software. All documents are available on , and the Help files install with the ni.com... -
Page 4: Password
Password The default calibration password is Calibration Interval National Instruments recommends a calibration interval of one year for the NI PXI-5412. You should adjust the recommended calibration interval based on the measurement accuracy demands of your application. Test Equipment External calibration requires different equipment for each applicable specification. Refer to Table 2 for a list of equipment. -
Page 5: Test Conditions
Observe the 15 minute warm-up time. Self-Calibration Procedures The NI 5412 can perform self-calibration, which adjusts the gain and offset of the main analog path. Self-calibration uses only an onboard ADC to measure the output voltage. You can implement self-calibration on the NI 5412 by following procedures similar to the... -
Page 6: Max
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 5412 programmatically using NI-FGEN, complete the following steps: Call (niFgen Initialize VI) to open an NI-FGEN session using the following niFgen_init parameters: •... -
Page 7: External Calibration Options
The Optional Calibration section describes alternate procedures that allow you to skip adjustment if the device already meets its calibration test limits or published specifications. NI 5412 Calibration Procedure | © National Instruments | 7... -
Page 8: Complete Calibration
Complete Calibration Performing a complete calibration is the recommended way to guarantee that the NI 5412 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 (Adjustment Without Adjusting Optional) Adjust (Cal Dates and Adjust Temperatures Anyway? Updated) Document Verify Post-Adjustment Results Meets Calibration/ Calibration Verification Test Limits? Complete Review Verification/ Adjustment Procedure or Return Device NI 5412 Calibration Procedure | © National Instruments | 9...
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Page 10: External Calibration Procedures
Verification determines whether the device is performing within its specifications prior to external adjustment. Verification and external adjustment together compose a complete calibration. To verify that the NI 5412 still meets its specifications, you must use NI-FGEN to control the NI 5412. - Page 11 NI 5412 to NI for repair. Refer to Table 2 for information about which instrument to use for verifying each specification. Refer to Figure 3 for the names and locations of the NI PXI-5412 and the NI PCI-5412 front panel connectors.
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Page 12: Verifying The Oscillator Frequency Accuracy
This test verifies the frequency accuracy of the oscillator on the NI 5412. The verification involves generating a 10 MHz sine wave with the NI 5412 and measuring the sine wave frequency with one of the instruments from Table 2. - Page 13 (waveform handle) that identifies the waveform created by this function. 10. Call (niFgen Initiate Generation VI) to initiate the niFgen_InitiateGeneration waveform generation using the following parameter: vi: The session handle returned from • niFgen_init NI 5412 Calibration Procedure | © National Instruments | 13...
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Page 14: 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 5412 into a high-impedance load by generating a number of DC voltages and offsets, measuring the voltage with a DMM, and comparing the NI 5412 to the error limits. - Page 15 (positive full-scale handle). Create an array of waveform samples for the negative full-scale DC waveform. This array should contain 500 samples with each sample having the value (representation: -1.0 double). NI 5412 Calibration Procedure | © National Instruments | 15...
- Page 16 ±0.004500 ±0.010500 2.000000 2.000000 -2.000000 ±0.003700 ±0.008500 1.650000 1.650000 -1.650000 ±0.003140 ±0.007100 1.250000 1.250000 -1.250000 ±0.002500 ±0.005500 0.850000 0.850000 -0.850000 ±0.001860 ±0.003900 0.600000 0.600000 -0.600000 ±0.001460 ±0.002900 0.415000 0.415000 -0.415000 ±0.001164 ±0.002160 16 | ni.com | NI 5412 Calibration Procedure...
- Page 17 (niFgen property node: Arbitrary Waveform Output»Arbitrary Waveform Handle) using the following parameters: vi: The session handle returned from • niFgen_init channelName: • "0" • attributeID: NIFGEN_ATTR_ARB_WAVEFORM_HANDLE • value: The wfmHandle from step 8 (positive full-scale handle). NI 5412 Calibration Procedure | © National Instruments | 17...
- Page 18 • vi: The session handle returned from niFgen_init 20. Measure the DC voltage out of the NI 5412. This value is the Measured Negative Full-Scale Value. 21. Calculate the error for negative full-scale using the following formula: Error Negative Full-Scale = (Measured Negative Full-Scale Value) - (Ideal Full-Scale Value) Compare this error to the Published Specification or the Calibration Test Limit listed in Table 4.
- Page 19 Verifying the Main Analog Path Offset To verify the offset of the NI 5412 main analog path, complete the following steps: Create an array of waveform samples for the mid-scale DC waveform (0 VDC). This array should contain 500 samples with each sample having the value (representation: double).
- Page 20 Arbitrary Waveform Output»Arbitrary Waveform Offset) using the following parameters: • vi: The session handle returned from niFgen_init • channelName: "0" • attributeID: NIFGEN_ATTR_ARB_OFFSET value: The Ideal Positive Offset value listed in Table 5 for the current iteration. • 20 | ni.com | NI 5412 Calibration Procedure...
- Page 21 • vi: The session handle returned from niFgen_init 12. Measure the negative DC voltage out of the NI 5412. This value is the Measured Negative Offset Value. 13. Calculate the error for positive offset using the following formula: Error Negative Offset = (Measured Negative Offset Value) - (Ideal Negative Offset Value) Compare this error to the Published Specification or the Calibration Test Limit listed in Table 5.
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Page 22: Verifying The Ac Voltage Amplitude Absolute Accuracy
Connect the NI 5412 CH 0 front panel connector to the DMM using the SMB(m)-to-BNC(f) cable and the BNC(f)-to-banana(m) adapter. Connect the SMB connector of the cable to CH 0 of the NI 5412. Connect the BNC connector of the cable to the BNC(f)-to-banana(m) adapter. Connect the banana adapter to the DMM, maintaining the correct polarity. - Page 23 Test Limit Test Limit Iteration Gain (VRMS) (VRMS) (-VRMS) (+VRMS) 12.000000 8.485281 -0.085560 0.170413 10.000000 7.071068 -0.0714178 0.142128 7.000000 4.949747 -0.050205 0.099702 5.000000 3.535534 -0.036062 0.071418 3.500000 2.474874 -0.025456 0.050205 NI 5412 Calibration Procedure | © National Instruments | 23...
- Page 24 Waveform»Gain) to set the gain using the following parameters: • vi: The session handle returned from niFgen_init • channelName: "0" attributeID: • NIFGEN_ATTR_ARB_GAIN value: The Gain value listed in Table 6 for the current iteration • 24 | ni.com | NI 5412 Calibration Procedure...
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Page 25: Verifying Frequency Response (Flatness)
17. If any of the errors are greater than the test limits, perform an external adjustment. Verifying Frequency Response (Flatness) This test verifies the frequency response (flatness) of the NI 5412 using a power meter. To verify the flatness of the NI 5412, complete the following steps: Connect the NI 5412 CH 0 front panel connector to the power meter using the required adapter. - Page 26 Table 7. Wire the Sinusoidal Pattern output of the Sine Pattern VI to the Waveform Data Array input of the niFgen Create Waveform (DBL) VI. Table 7. NI 5412 Setup for Frequency Response (Flatness) Verification Published Specification Number...
- Page 27 14. Measure and record the reference (50 kHz) power (W ) of the positive output in Watts. 15. Configure the NI 5412 and power meter frequency according to the next iteration in Table 7. 16. Using the recorded power values, calculate the deviation from the reference (50 kHz) power using the following equation: ...
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Page 28: Adjusting The Ni 5412
EEPROM of the NI 5412. If the NI 5412 passed verification within the calibration test limits and you do not want to do an adjustment, you can update the calibration date and onboard calibration temperature without... -
Page 29: Initializing The External Calibration Session
Devices and Interfaces in MAX. password: The password required to open an external calibration session. If this password • has not been changed since manufacturing, the password is "NI" NI 5412 Calibration Procedure | © National Instruments | 29... -
Page 30: Adjusting The Analog Output
• value: 2000 Call to set the offset DAC value (niFgen property niFgen_SetAttributeViInt32 node: Calibration»Offset DAC Value) using the following parameters: • vi: The session handle returned from niFgen_InitExtCal • channelName: "0" 30 | ni.com | NI 5412 Calibration Procedure... - Page 31 (niFgen property niFgen_SetAttributeViInt32 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 NI 5412 Calibration Procedure | © National Instruments | 31...
- Page 32 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 5412 CH 0 front panel connector into a high-impedance load: Call to set the gain DAC value (niFgen property niFgen_SetAttributeViInt32 node: Calibration»Gain DAC Value) using the following parameters:...
- Page 33 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 6. measurement 2 NI 5412 Calibration Procedure | © National Instruments | 33...
- Page 34 DAC value (niFgen property niFgen_SetAttributeViInt32 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: 32000 34 | ni.com | NI 5412 Calibration Procedure...
- Page 35 NIFGEN_ATTR_PRE_AMPLIFIER_ATTENUATION value: The Pre-Amplifier Attenuation value for the current iteration from Table 9. • Call the following functions and take voltage measurements at the NI 5412 CH 0 front panel connector into a high-impedance load: Call to set the gain DAC value (niFgen property niFgen_SetAttributeViInt32 node: Calibration»Gain DAC Value) using the following parameters:...
- Page 36 (niFgen Write Binary 16 Analog niFgen_WriteBinary16AnalogStaticValue Static Value VI) to set the main DAC value using the following parameters: vi: The session handle returned from • niFgen_InitExtCal channelName: • "0" • value: 36 | ni.com | NI 5412 Calibration Procedure...
- Page 37 GAIN_ANALOG_PATH MAIN_PATH_LOW_GAIN_0DB NIFGEN_VAL_FIXED_LOW_ NIFGEN_VAL_CAL_CONFIG_ GAIN_ANALOG_PATH MAIN_PATH_LOW_GAIN_12DB NIFGEN_VAL_FIXED_LOW_ NIFGEN_VAL_CAL_CONFIG_ GAIN_ANALOG_PATH MAIN_PATH_LOW_GAIN_24DB NIFGEN_VAL_FIXED_LOW_ NIFGEN_VAL_CAL_CONFIG_ GAIN_ANALOG_PATH MAIN_PATH_LOW_GAIN_36DB NIFGEN_VAL_FIXED_HIGH NIFGEN_VAL_CAL_CONFIG_ _GAIN_ANALOG_PATH MAIN_PATH_HIGH_GAIN_0DB NIFGEN_VAL_FIXED_HIGH NIFGEN_VAL_CAL_CONFIG_ _GAIN_ANALOG_PATH MAIN_PATH_HIGH_GAIN_12DB NIFGEN_VAL_FIXED_HIGH NIFGEN_VAL_CAL_CONFIG_ _GAIN_ANALOG_PATH MAIN_PATH_HIGH_GAIN_24DB NIFGEN_VAL_FIXED_HIGH NIFGEN_VAL_CAL_CONFIG_ _GAIN_ANALOG_PATH MAIN_PATH_HIGH_GAIN_36DB NI 5412 Calibration Procedure | © National Instruments | 37...
- Page 38 NIFGEN_ATTR_POST_AMPLIFIER_ATTENUATION • value: The Post-Amplifier Attenuation value for the current iteration from Table 10. Call the following functions and take voltage measurements at the NI 5412 CH 0 front panel connector into a high-impedance load: Call to set the offset DAC value (niFgen niFgen_SetAttributeViInt32 property node: Calibration»Offset DAC Value) using the following parameters:...
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Page 39: Adjusting The Oscillator Frequency
• vi: The session handle returned from niFgen_InitExtCal • channelName: "0" attributeID: • NIFGEN_ATTR_ARB_GAIN value: • You can adjust this value based on which measuring device you use. Note NI 5412 Calibration Procedure | © National Instruments | 39... - Page 40 Because you set the sample rate to 100 MS/s and because there are 10 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. 40 | ni.com | NI 5412 Calibration Procedure...
- Page 41 (niFgen Initiate Generation VI) to initiate the niFgen_InitiateGeneration waveform generation using the following parameter: vi: The session handle returned from • niFgen_InitExtCal Measure the frequency of the generated waveform. This value is the Measured Frequency. NI 5412 Calibration Procedure | © National Instruments | 41...
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Page 42: Adjusting The Calibration Adc
Adjusting the Calibration ADC The NI 5412 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 43 (niFgen Write Binary 16 Analog niFgen_WriteBinary16AnalogStaticValue Static Value VI) to set the main DAC value using the following parameters: vi: The session handle returned from • niFgen_InitExtCal channelName: • "0" value: • 27232 NI 5412 Calibration Procedure | © National Instruments | 43...
- Page 44 • niFgen_InitExtCal 20. Wait 500 ms for the output to settle. 21. Use the DMM to measure the NI 5412 voltage output directly into the DMM into a high-impedance load. This measurement is , which is used external measurement 0 in step 31.
- Page 45 • niFgen_InitExtCal 29. Wait 500 ms for the output to settle. 30. Use the DMM to measure the NI 5412 voltage output directly into the DMM (into a high-impedance load). This measurement is , which is used external measurement 1 in step 31.
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Page 46: Closing The External Adjustment Session
If any errors occurred during the external adjustment procedure or if you want to abort the operation, use . 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. 46 | ni.com | NI 5412 Calibration Procedure... -
Page 47: Calibration Utilities
Calibration Utilities NI-FGEN supports several calibration utilities that allow you to retrieve information about adjustments performed on the NI 5412, 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 48: Where To Go For Support
NI product. 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. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.
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