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 National Instruments Corporation

23

NI PXIe-5611 Calibration Procedure

Adjusting Modulation Impairments

This adjustment measures and corrects the NI 5611 RF fundamental, 
carrier, and image tones until the carrier and image tones are sufficiently 
suppressed.

Complete the following steps to calibrate the modulation impairments of 
the NI 5611 using a spectrum analyzer.

1.

Connect the NI 5611 RF OUT front panel connector to the spectrum 
analyzer RF INPUT front panel connector.

2.

Connect the PXI Express chassis 10 MHz REF IN rear panel connector 
to the spectrum analyzer 10 MHz REF OUT rear panel connector.

3.

Call the niRFSG Initialize External Calibration VI.

4.

Call the niRFSG 5611 Initialize Impairment Calibration VI. 

5.

Call the niRFSG 5611 Configure Impairment Calibration VI. 

Note

The default behavior of the niRFSG 5611 Configure Impairment Calibration VI is 

to calibrate all filters. If you choose to calibrate a single filter, repeat the entire RF path 
calibration procedure for each of the eight filters to complete a full calibration. 

6.

Use the spectrum analyzer to measure the mean tone power using the 
following spectrum analyzer parameter settings:

•

Center frequency: Value specified by the 

Frequency to Measure 

(Hz)

 parameter of the niRFSG 5611 Configure LO Filter 

Calibration VI

•

Reference level: Value specified by the 

Spectrum Analyzer 

Reference Level (dB) 

parameter of the niRFSG 5611 Configure 

Impairment Calibration VI

•

Frequency  span:  0  Hz

•

Resolution bandwidth: 500 Hz

•

Sweep time: 5 ms

7.

Call the niRFSG 5611 Adjust Impairment Calibration VI, and pass the 
measurement from step 6 to the 

Measured RF OUT Power (dBm)

 

parameter of the niRFSG 5611 Adjust RF Gain Calibration VI.

8.

Repeat steps 5 through 7 until the 

Impairment Calibration 

Complete 

parameter returns a value of TRUE.

9.

Call the niRFSG Close External Calibration VI to close the session and 
store the results to the EEPROM on the NI 5611.

Содержание PXIe-5611

Страница 1: ...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 Ga...

Страница 2: ...rd or value that you must supply monospace Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions monospace bold Bold text in this fo...

Страница 3: ... NI RF Signal Generators Getting Started Guide NI RF Signal Generators Help including LabVIEW VI programming references 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 calib...

Страница 4: ...s of testing to ensure that the accuracy of the device Perform verification post adjustment to determine if the adjustment was successful Adjustment is the process of measuring and compensating for device performance to improve the measurement accuracy Performing an adjustment updates the calibration date Perform a complete calibration to guarantee successful adjustment and performance of the NI 5...

Страница 5: ... complete calibration Figure 1 Complete Calibration Programming Flow Document Post Adjustment Results Document Pre Adjustment Results Calibration Verification Complete Yes No Verify Meets Test Limits Review Verification Adjustment Procedure or Return Device Adjust Calibration Dates and Temperatures Updated Verify ...

Страница 6: ... dBm Frequency range 50 MHz to 6 6 GHz Accuracy 0 5 Power splitter Aeroflex Weinschel 1593 SWR 1 25 Amplitude tracking 0 25 dB NI PXIe 5450 arbitrary waveform generator NI PXIe 5450 This device must be fully calibrated before calibrating the NI 5611 NI PXI 5652 RF signal generator NI PXI 5652 This device must be fully calibrated before calibrating the NI 5611 6 dB attenuator Anritsu 41KB 6 Frequen...

Страница 7: ...ative humidity between 10 and 90 noncondensing Maintain an ambient temperature of 23 C 5 C Allow a warm up time of at least 30 minutes after the chassis is powered on The warm up time ensures that the NI 5611 is at a stable operating temperature Perform a self calibration on the NI PXIe 5450 signal generator Each verification procedure requires a delay to be inserted in between configuring all dev...

Страница 8: ...Complete the following steps to characterize a splitter using an NI 5652 power meter and spectrum analyzer as shown in Figure 2 1 Disconnect the NI 5611 LO IN front panel connector from the NI 5652 RF OUT front panel connector 2 Connect the power meter power sensor to the NI 5652 RF OUT front panel connector 3 Generate a tone with the NI 5652 with the following NI RFSG property settings Frequency ...

Страница 9: ...nt 8 Connect one available port of the power splitter to the power sensor without a cable if possible 9 Connect one available end of the power splitter to the 6 dB attenuator 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...

Страница 10: ...ments 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 1 NI 5652 RF Signal Generator 2 Splitter 3 Power Sensor 4 Attenuator 5 Power Meter 6 CH A Connector 7 Spectrum Analyzer 8 RF...

Страница 11: ...cts Verification of the NI 5611 is complete only after you have successfully completed all tests in this section Verifying LO Filter Response Complete the following steps to verify the LO filter response of an NI 5611 module using a spectrum analyzer 1 Connect the NI 5611 LO OUT front panel connector to the spectrum analyzer RF INPUT front panel connector 2 Connect the PXI Express chassis 10 MHz R...

Страница 12: ... corresponding limit in Table 1 8 Repeat steps 3 through 7 for every frequency from 85 MHz to 2 2 GHz in 5 MHz increments including endpoints If the results are within the selected test limit the device has passed this portion of the verification Verifying LO Path Gain Complete the following steps to verify the LO path gain of the NI 5611 module using a power meter 1 Connect the NI 5611 LO OUT fro...

Страница 13: ...te a single sideband tone with a 1 MHz offset from the carrier signal with the following NI RFSG property settings Frequency Hz 85 MHz Power Level dBm 0 dBm Generation Mode Arb Waveform Reference Clock Source ClkIn The image appears at 84 MHz and the carrier leakage at 85 MHz 4 Use the spectrum analyzer to measure the mean power of the RF output using the following spectrum analyzer parameter sett...

Страница 14: ... Reference clock source External 7 Calculate the image suppression ratio ISR and carrier suppression ratio CSR according to the following formulas and save the values ISR Measured Image Power Measured RF Output Power CSR Measured Carrier Leakage Power Measured RF Output Power 8 Repeat steps 3 though 7 for each LO frequency from 85 MHz to 6 6 GHz in 10 MHz steps including endpoints Note With the ba...

Страница 15: ... the carrier with the following NI RFSG property settings Frequency Hz 200 MHz Power Level dBm 0 dBm Generation Mode Arb Waveform Reference Clock Source ClkIn 4 Use the spectrum analyzer to measure the mean output power of the RF output using the following spectrum analyzer parameter settings Center frequency frequency in step 3 offset in step 3 Reference level 5 dBm Frequency span 0 Hz Resolution...

Страница 16: ...te the relative modulation bandwidth flatness by subtracting the RF output power measured at 0 Hz offset from the RF output powers measured at each of the other offset frequencies 9 Compare each value calculated in step 8 to the limits in Table 6 and compare only the ISR values calculated for offset frequencies between 10 MHz and 10 MHz in step 5 to the limits in Table 7 Note Values calculated for...

Страница 17: ...nalyzer power splitter and 6 dB attenuator Note The attenuator is placed in front of the spectrum analyzer to improve the spectrum analyzer return loss 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 Table 7 Modulation Bandwidth Impairment Verifica...

Страница 18: ...t 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 1 NI 5450 Arbitrary Waveform Generator 2 Connection from NI PXI Express REF IN Rear Panel Connector to Spectrum Analyzer REF OUT Rear Panel Connector 3 NI 5611 I Q Modulator 4 NI 5652 RF Signal Gene...

Страница 19: ... with the following NI RFSG property settings Frequency Hz 85 MHz Power Level dBm 5 dBm Generation Mode Arb Waveform Reference Clock Source ClkIn 8 Use the power meter to measure power splitter compensated output power 9 Repeat steps 7 through 8 for every frequency from 85 MHz to 6 6 GHz in 20 MHz increments including endpoints 10 Set the NI RFSG Power Level property to 0 dBm and repeat steps 7 th...

Страница 20: ... 90 dBm and repeat steps 7 through 9 using only the spectrum analyzer and its measured correction to measure the power accuracy using the following spectrum analyzer parameter settings Center frequency frequency in step 7 1 MHz Reference level 30 dBm Frequency span 0 Hz Resolution bandwidth 500 Hz Sweep time 200 ms Reference clock source External Attenuation 5 dB Preamplifier On 15 Compare the mea...

Страница 21: ... INPUT front panel connector 2 Connect the PXI Express chassis 10 MHz REF IN rear panel connector to the spectrum analyzer 10 MHz REF OUT rear panel connector on the spectrum analyzer 3 Call the niRFSG Initialize External Calibration VI 4 Call the niRFSG Initialize LO Filter Calibration VI Note The Filter to Calibrate parameter on the niRFSG Initialize LO Filter Calibration VI is by default set to...

Страница 22: ...all the niRFSG Initialize External Calibration VI 3 Call the niRFSG 5611 Initialize LO Gain Calibration VI Note The Filter to Calibrate parameter on the niRFSG Initialize LO Gain Calibration VI is by default set to All Filters If you set the Filter to Calibrate parameter to another filter setting you must repeat steps 3 through 7 for each filter 4 Call the niRFSG 5611 Configure LO Gain Calibration...

Страница 23: ...bration VI is to calibrate all filters If you choose to calibrate a single filter repeat the entire RF path calibration procedure for each of the eight filters to complete a full calibration 6 Use the spectrum analyzer to measure the mean tone power using the following spectrum analyzer parameter settings Center frequency Value specified by the Frequency to Measure Hz parameter of the niRFSG 5611 ...

Страница 24: ...l connector 1 NI 5450 Arbitrary Waveform Generator 2 NI 5611 I Q Modulator 3 NI 5652 RF Signal Generator 4 Power Sensor 5 Power Splitter 6 Attenuator 7 Power Meter 8 CH A Connector 9 Spectrum Analyzer 10 RF INPUT Connector Q Q 5 Vp p MAX 50 Ω LVTTL LVTTL 50 Ω 50 Ω 50 Ω 50 Ω CLK IN CLK OUT PFI 1 ACCESS ACTIVE I I 0 7 Vp p NOM CH 1 CH 0 CH 0 CH 1 PFI 0 ESD SENSITIVE NI PXIe 5450 400 MS s I Q Signal ...

Страница 25: ...ttom of the power meter s accurate range Note The default behavior of the niRFSG 5611 Configure RF Gain Calibration VI is to calibrate all filters If you choose to calibrate a single filter repeat the entire RF path calibration procedure on each of the eight filters to complete a full calibration 9 Configure the spectrum analyzer using the following spectrum analyzer parameter settings Center freq...

Страница 26: ...ment parameter of the niRFSG 5611 Configure RF Gain Calibration VI returns a value of Power Meter The sweep time should alternate several times between 20 ms and 200 ms as these conditions are met Note Only the instrument indicated by the Measurement Instrument parameter is actually used Values passed for the inactive instrument are ignored The power meter is used for higher power measurements and...

Страница 27: ...Calibration Utility palette includes the following VIs niRFSG Change External Calibration Password VI niRFSG Close External Calibration VI niRFSG Get External Calibration Last Date And Time VI niRFSG Initialize External Calibration VI niRFSG Set External Calibration Last Date and Time VI Calibration VI References The VIs used in this procedure including all calibration VIs and functions are docume...

Страница 28: ...roduct by visiting ni com certification If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your support needs For telephone support in the Uni...

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