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CALIBRATION PROCEDURE
NI PXIe-5611
Contents
This document describes processes to calibrate the NI PXIe-5611 I/Q
modulator. This document provides performance tests to verify if the
instrument is performing within the published specifications. For more
information about calibration, visit
Conventions ............................................................................................ 2
Software Requirements ........................................................................... 2
Documentation Requirements................................................................. 3
Password ................................................................................................. 4
Calibration Interval ................................................................................. 4
Calibration Overview.............................................................................. 4
Test Equipment ....................................................................................... 6
Test Conditions ....................................................................................... 7
Calibration Procedures ............................................................................ 7
Initial Setup...................................................................................... 8
Verification ...................................................................................... 11
Verifying LO Filter Response .................................................. 11
Verifying LO Path Gain ........................................................... 12
Verifying Modulation Impairments.......................................... 13
Verifying Modulation Bandwidth and Impairments ................ 15
Verifying RF Path Gain ............................................................ 17
Adjustment....................................................................................... 21
Adjusting LO Filter Response .................................................. 21
Adjusting LO Path Gain ........................................................... 22
Adjusting Modulation Impairments.......................................... 23
Adjusting RF Path Gain............................................................ 24
Appendix A: Calibration Utilities ........................................................... 27
Calibration VI References ............................................................... 27
Where to Go for Support......................................................................... 28
ni.com/calibration
.
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Table of Contents
Summary of Contents for National Instruments PXIe-5611
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Page 1: Table Of Contents
CALIBRATION PROCEDURE NI PXIe-5611 This document describes processes to calibrate the NI PXIe-5611 I/Q modulator. This document provides performance tests to verify if the instrument is performing within the published specifications. For more information about calibration, visit ni.com/calibration Contents Conventions .................... 2 Software Requirements ................ -
Page 2: Conventions
Software Requirements To calibrate the NI PXIe-5611, you must install NI-RFSG version 1.6 or later on the calibration system. NI-RFSG includes all the VIs necessary for calibration. You can download the latest version of NI-RFSG at ni.com/idnet... -
Page 3: Documentation Requirements
These documents are installed with NI-RFSG. You can also download the latest versions of documentation at ni.com/manuals This calibration procedure calibrates the NI PXIe-5611 I/Q modulator as a stand-alone device. To calibrate the NI PXIe-5673 or NI PXIe-5673E, refer to their calibration procedures at ni.com/manuals... -
Page 4: Password
After calibrating the NI 5611 as a stand-alone device, NI strongly recommends that you calibrate the NI 5673, which includes the NI 5611. To calibrate the NI PXIe-5673 or NI PXIe-5673E, refer to their calibration procedures at ni.com/manuals NI PXIe-5611 Calibration Procedure ni.com... - Page 5 Verify Pre-Adjustment Results Adjust (Calibration Dates and Temperatures Updated) Document Post-Adjustment Verify Results Meets Test Limits? Review Verification/ Calibration/ Adjustment Procedure Verification or Return Device Complete Figure 1. Complete Calibration Programming Flow © National Instruments Corporation NI PXIe-5611 Calibration Procedure...
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Page 6: Test Equipment
Matched-length I/Q semi rigid SMA cable (4) Accessory Kit LO semi-rigid SMA cable (1) RF flexible SMA cable (1) SMA adapter Huber+Suhner VSWR: 1.05 : 1 plug/plug 32_N-SMA-50-1/11-_NE BNC (m) to BNC — — (m) cable (36 inches) NI PXIe-5611 Calibration Procedure ni.com... -
Page 7: Test Conditions
NI RF Signal Generators Getting Started Guide for more information about how to configure your device. Verification—Verify the existing operation of the device. This step confirms whether the device is operating within its specified range prior to adjustment. © National Instruments Corporation NI PXIe-5611 Calibration Procedure... -
Page 8: Initial Setup
Connect the power splitter input port to the NI 5652 RF OUT front panel connector without a cable, if possible. NI PXIe-5611 Calibration Procedure ni.com... - Page 9 10. Connect the other available port of the 6 dB attenuator to the spectrum analyzer RF INPUT front panel connector as shown in Figure 2. 11. Configure the reference level of the spectrum analyzer to –30 dBm. The spectrum analyzer is used only for termination. © National Instruments Corporation NI PXIe-5611 Calibration Procedure...
- Page 10 13. Subtract the power measurements from step 5 from the measurements in step 12 for each corresponding frequency. Store the resulting calculations. The result is an array representing the loss through the splitter for the entire needed frequency range in 5 MHz increments. NI PXIe-5611 Calibration Procedure ni.com...
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Page 11: Verification
Use the spectrum analyzer to measure the mean fundamental tone power using the following spectrum analyzer parameter settings: • Center Frequency: Frequency from step 3 • Reference level: +5 dBm • Frequency span: 0 Hz © National Instruments Corporation NI PXIe-5611 Calibration Procedure... -
Page 12: Verifying Lo Path Gain
Generate a signal with the following NI-RFSG property settings: • Frequency (Hz): 85 MHz • Power Level (dBm): 0 dBm • Generation Mode: CW • LO OUT Enabled: Enabled Use the power meter to measure the LO OUT power. NI PXIe-5611 Calibration Procedure ni.com... -
Page 13: Verifying Modulation Impairments
Zero-span mode shortens test time by avoiding unnecessary frequency sweeping. To obtain the average power, convert the zero-span trace data to linear volts, perform a mean calculation, and then convert the linear volts back to dBm. © National Instruments Corporation NI PXIe-5611 Calibration Procedure... - Page 14 Use Table 5 to compare the ISR and CSR from step 7 for each LO frequency. Table 5. Modulation Impairments Verification Upper Test Limits LO Frequency ISR (dBc) CSR (dBc) (MHz) Test Limit Test Limit 85 to 400 –43 –44 400 to 2,500 –50 –44 NI PXIe-5611 Calibration Procedure ni.com...
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Page 15: Verifying Modulation Bandwidth And Impairments
• Center frequency: frequency in step 3 – offset in step 3 • Reference level: +5 dBm • Frequency span: 0 Hz • Resolution bandwidth: 500 Hz © National Instruments Corporation NI PXIe-5611 Calibration Procedure... - Page 16 10. Repeat steps 3 through 9 for each LO frequency in Table 6. Table 6. Modulation Bandwidth Impairment Verification Test Limits Modulation Bandwidth Test Limits (dB) LO Frequency (GHz) Maximum Minimum –3 –3 –3 –3 NI PXIe-5611 Calibration Procedure ni.com...
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Page 17: Verifying Rf Path Gain
The power splitter must be characterized so that you can account for its loss. Refer to the Characterizing the Power Splitter section for more information about how to characterize your power splitter. © National Instruments Corporation NI PXIe-5611 Calibration Procedure... - Page 18 The port used to connect the power splitter to the power sensor in step 8 of the Characterizing the Power Splitter section must be the same port used to connect the power splitter to the power meter in step 3 of this section. NI PXIe-5611 Calibration Procedure ni.com...
- Page 19 Sweep time: 20 ms • Reference clock source: External • Attenuation: 5 dB • Preamplifier: On 12. Use the power meter measurements to calculate a correction for the spectrum analyzer inaccuracies and attenuator loss. © National Instruments Corporation NI PXIe-5611 Calibration Procedure...
- Page 20 Table 8. RF Path Gain Verification Test Limits Output Power (dBm) Power Accuracy Test Limits (dB) ±0.75 ±0.75 –30 ±0.75 –60 ±0.75 –90 ±0.75 If the results are within the selected test limit, the device has passed this portion of the verification. NI PXIe-5611 Calibration Procedure ni.com...
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Page 21: Adjustment
Measure (Hz) parameter of the niRFSG 5611 Configure LO Filter Calibration VI • Reference level: +5 dBm • Frequency span: 0 Hz • Resolution bandwidth: 500 Hz • Sweep time: 5 ms © National Instruments Corporation NI PXIe-5611 Calibration Procedure... -
Page 22: Adjusting Lo Path Gain
Repeat steps 4 through 6 until the LO Gain Calibration Complete parameter returns a value of TRUE. Call the niRFSG Close External Calibration VI to close the session and store the results to the EEPROM on the NI 5611. NI PXIe-5611 Calibration Procedure ni.com... -
Page 23: Adjusting Modulation Impairments
Repeat steps 5 through 7 until the Impairment Calibration Complete parameter returns a value of TRUE. Call the niRFSG Close External Calibration VI to close the session and store the results to the EEPROM on the NI 5611. © National Instruments Corporation NI PXIe-5611 Calibration Procedure... -
Page 24: Adjusting Rf Path Gain
9 Spectrum Analyzer 5 Power Splitter 10 RF INPUT Connector Figure 4. Connecting Hardware to Adjust RF Path Gain Connect the input port of the power splitter to the NI 5611 RF OUT front panel connector. NI PXIe-5611 Calibration Procedure ni.com... - Page 25 5611 Configure Impairment Calibration VI, measure the mean power of the generated tone at the frequency specified by the Frequency to Measure (Hz) parameter of the niRFSG 5611 Configure RF Gain Calibration VI. © National Instruments Corporation NI PXIe-5611 Calibration Procedure...
- Page 26 15. Call the niRFSG Close External Calibration VI to close the session and store the results to the EEPROM on the NI 5611. You have finished adjusting the NI 5611. Repeat the Verification section to reverify the performance of the NI 5611 after adjustments. NI PXIe-5611 Calibration Procedure ni.com...
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Page 27: Appendix A: Calibration Utilities
The VIs used in this procedure, including all calibration VIs and functions, are documented in the NI-RFSG VI Reference, which you can access from the NI RF Signal Generators Help at Start»All Programs»National Instruments»NI-RFSG»Documentation. © National Instruments Corporation NI PXIe-5611 Calibration Procedure... -
Page 28: Where To Go For Support
For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents.