Contents. CALIBRATION PROCEDURE NI PXIe-5698

Transcription

1 CALIBRATION PROCEDURE NI PXIe-5698 This document contains the verification and adjustment procedures for the National Instruments PXIe-5698 (NI 5698). See ni.com/calibration for more information about calibration solutions. The procedures in this document are for the NI 5698 only. Refer to the NI PXIe-5668R Calibration Procedure document to calibrate the NI PXIe-5668R with the NI NI warrants the NI 5668R and NI 5698 to meet their published specifications if the individual modules are calibrated and operating within specifications. Consult the Letter of Conformance for more information about RF system calibration at ni.com/manuals. Contents Software... 2 Documentation... 2 Calibration Cycle... 2 Test Equipment... 2 Test Conditions... 7 Initial Setup... 7 Characterization... 7 Zeroing and Calibrating the Power Sensor... 8 Characterizing Power Splitter Reference Output... 8 Characterizing the RF Source Power... 8 As-Found and As-Left Limits Verification Verifying Bypass Insertion Loss Verifying Gain...13 Adjustment Initial Connections Adjusting Bypass Path Insertion Loss Calibration Adjusting RF Gain for Frequencies 10 MHz to 26.5 GHz Reverification Appendix A: NI 5698 Configuration Table Appendix B: Power Sensor Calibration Factor Uncertainty Worldwide Support and Services... 23

2 Software Calibrating the NI 5698 requires you to install the following software on the calibration system: NI-RFSA 15.6 or later NI Spectral Measurements Toolkit 2.5 or later You can download all required software from ni.com/downloads. The software supports programming the calibration procedures in the LabVIEW, C, and LabWindows /CVI application development environments (ADEs). When you install the software, you need to install support only for the ADE that you intend to use. Documentation You can consult the following documents as you perform the calibration procedure: NI PXIe-5698 RF Preamplifier Module Getting Started Guide NI PXIe-5698 Specifications NI PXIe-5668R RF Vector Signal Analyzer Getting Started Guide NI PXIe-5668R Specifications NI RF Vector Signal Analyzers Help, (includes LabVIEW VI and C/CVI programming references) You might also find the following documents helpful: NI PXIe-5653 Calibration Procedure NI PXIe-5624R Calibration Procedure The latest versions of these documents are available on ni.com/manuals. Calibration Cycle The measurement accuracy requirements of your application determine how often you should calibrate your device. NI recommends that you perform a complete calibration for the NI 5698 at least once every two years. You can reduce this calibration interval based on the accuracy demands of your application. Test Equipment Table 1 lists the equipment NI recommends for the performance verification and adjustment procedures. If the recommended equipment is not available, select a substitute using the minimum requirements listed in Table 1. 2 ni.com NI PXIe-5698 Calibration Procedure

3 Table 1. Recommended Equipment for NI 5698 Calibration Equipment Recommended Models Where Used Requirements NI PXIe-5698 Calibration Procedure National Instruments 3 Power meter Anritsu ML2438A Gain calibration Gain Power sensors (x2) Anritsu SC7413 Gain calibration Gain Display resolution: 0.01 db Setting: ±0.1% Instrumentation accuracy: <±0.5% Noise, zero set, and drift: ±0.5% full-scale (lowest range) Reference power uncertainty: ±0.9% Reference output VSWR: <1.04 : 1 Power range: -55 dbm to 20 dbm Frequency range: 100 khz to 26.5 GHz Input VSWR: <150 MHz... <1.17 : MHz to < 2 GHz... <1.08 : 1 2 GHz to < 12.4 GHz... <1.16 : GHz to < 18 GHz... <1.21 : 1 18 GHz to < 32 GHz... <1.29 : 1 Linearity: <18 GHz... <1.8% 18 GHz to < 40 GHz... <2.5% Calibration factor uncertainty (2 σ): refer to Appendix B: Power Sensor Calibration Factor Uncertainty

4 4 ni.com NI PXIe-5698 Calibration Procedure Table 1. Recommended Equipment for NI 5698 Calibration (Continued) Equipment Recommended Models Where Used Requirements RF source Anritsu MG3694C Options 1A, 2B, 4, 22, and 28B Gain Frequency range: 10 MHz to 26.5 GHz Level power: -50 dbm to 18 dbm Power accuracy: ±1.5 db Harmonics: 0.1 MHz to 10 MHz dbc >10 MHz to 10 MHz... <-40 dbc >100 MHz to 2.2 GHz... <-50 dbc >2.2 GHz to 16 GHz... <-30 dbc Nonharmonic spurious: 0.1 MHz to 10 MHz... <-30 dbc >10 MHz to 2.2 GHz... <-60 dbc >2.2 GHz to 16 GHz dbc Output VSWR: <2.0 : 1 PXI Express chassis NI PXIe-1075 or NI PXIe-1085 All procedures PXI Express controller NI PXIe-8133 or NI PXIe-8135 All procedures Spectrum analyzer NI 5668R Gain Frequency range: 10 MHz to 26.5 GHz Reference level: -50 dbm to 0 dbm Amplitude accuracy: ±1.5 db

5 Table 1. Recommended Equipment for NI 5698 Calibration (Continued) Equipment Recommended Models Where Used Requirements 2.92 mm (m)- to-2.92 mm (m) cables (x3) Frequency range: DC to 26.5 GHz Insertion loss: 10 db at 26.5 GHz Impedance: 50 Ω VSWR: at 26.5 GHz Length: 24 in. NI PXIe-5698 Calibration Procedure National Instruments mm (m)- to-2.92 mm (m) adapter SMA (f)-to-sma (f) adapter Anritsu K220B Frequency range: DC to 26.5 GHz Impedance: 50 Ω VSWR: <2.0 DC to 26.5 GHz Return loss: DC to 1.5 GHz db 1.5 GHz to 6.0 GHz db 6.0 GHz to 18.0 GHz db Fairview Microwave SM4953 Frequency range: DC to 26.5 GHz Amplitude tracking: <0.25 db Phrase tracking: <4 Insertion loss: 8.5 db (6 db, nominal) Power rating: 1 W Impedance: 50 Ω VSWR: <2.0 DC to 26.5 GHz

6 6 ni.com NI PXIe-5698 Calibration Procedure Table 1. Recommended Equipment for NI 5698 Calibration (Continued) Equipment Recommended Models Where Used Requirements Attenuator Anritsu 41KC-20 Frequency range: DC to 40 GHz Attenuation: 20 db (nominal) Power rating: 2 W average Impedance: 50 Ω VSWR: DC to 4 GHz : 1 4 GHz to 8 GHz : 1 8 GHz to 12.4 GHz : GHz to 18 GHz : GHz to 26.5 GHz : 1 Power splitter (two-resistors type) Weinschel 1534 Frequency: 10 MHz Frequency accuracy: 1 x 10-9 Torque wrench NI N m (9 lb in.)

7 Test Conditions The following setup and environmental conditions are required to ensure the NI 5698 meets published specifications: Keep cabling as short as possible. Long cables and wires act as antennas, picking up extra noise that can affect measurements. Verify that all connections, including front panel connections and screws, are secure. Use an appropriate torque wrench or torque screwdriver and SMA driver bit to tighten all module RF connectors (SMA or 2.92 mm). NI recommends use of 1 N m (9 lb in.). Maintain an ambient temperature of 23 C ± 5 C. Keep relative humidity between 10% and 90%, noncondensing. Ensure that the PXI Express chassis fan speed is set to HIGH, that the fan filters, if present, are clean, and that the empty slots contain filler panels. For more information about maintaining adequate air circulation in your PXI/PXI Express chassis, refer to the Maintained Forced-Air Cooling Note to Users document available at ni.com/manuals. Allow a warm-up time of at least 30 minutes after the chassis is powered on and the NI-RFSA is loaded and recognizes the NI The warm-up time ensures that the NI 5698 and test instrumentation are at a stable operating temperature. In each verification procedure, insert a delay between configuring all devices and acquiring the measurement. This delay may need to be adjusted depending on the instruments used but should always be at least 1,000 ms for the first iteration, and 100 ms for each other iteration. Lock all test equipment to the REF OUT signal on the back of the PXI Express chassis. Initial Setup Refer to the NI 5698 RF Preamplifier Module Getting Started Guide for information about how to install the software and hardware and how to configure the device in Measurement & Automation Explorer (MAX). Characterization Use the measured response of the test system during verification tests. The power splitter and attenuation response is measured at the RF input frequencies used in the verification tests. Caution The connectors on the NI 5698 and test equipment are fragile. Carefully perform the steps in these procedures to prevent damaging any DUTs or test equipment. NI PXIe-5698 Calibration Procedure National Instruments 7

8 Zeroing and Calibrating the Power Sensor 1. Connect channel A of the power meter to power sensor A. 2. Connect channel B of the power meter to power sensor B. 3. Zero and calibrate the power sensors using the built-in functions in the power meter. Characterizing Power Splitter Reference Output Designate one of the two outputs of the power splitter as the reference output. Consistently use the same output as the reference output throughout the characterization and verification procedures. Characterizing the RF Source Power Note Zero and calibrate the power sensor prior to starting this procedure using the Zeroing and Calibrating the Power Sensor section of this document. Direct Characterization 1. Connect the RF source output to the power sensor B input using the 2.92 mm (m)-to-2.92 mm (m) cable and SMA (f)-to-sma (f) adapter. Refer to Figure 1 for a diagram of the completed equipment setup. Figure 1. RF Source Output Power Characterization Equipment Setup RF Source mm (m)-to-2.92 mm (m) Cable 3 SMA (f)-to-sma (f) Adapter 4 Power Sensor B 5 Power Meter 2. Set the RF source frequency to MHz. 3. Set the RF source power to -15 dbm. 8 ni.com NI PXIe-5698 Calibration Procedure

9 ACCESS ACTIVE 0 VDC + 20 dbm MAX > 10 MHz +10 dbm MAX < 10 MHz ACCESS ACTIVE 5 V p-p MAX 1.5 V p-p MAX 1.5 V p-p MAX Synthesizer ESD SENSITIVE ALL PORTS Measure the channel B power using the appropriate calibration factor for power sensor B frequency. Record this measurement as RF Source Power Direct. 5. Repeat steps 2 through 4 for RF source frequencies up to 26.5 GHz in 100 MHz increments. Splitter and Attenuator Characterization Note Zero and calibrate the power sensor and define the power splitter reference output using the procedures in the Characterizing the RF Source Power section of this document prior to starting this procedure. 1. Connect the RF source output to the power splitter input using the 2.92 mm (m)-to-2.92 mm (m) cable. 2. Connect power sensor A to the power splitter reference output. 3. Connect the other power splitter output to the NI 5668R RF IN connector using the 2.92 mm (m)-to-2.92 mm (m) adapter and 20 db attenuator. Refer to Figure 2 for a diagram of the completed equipment setup. Figure 2. RF Source Power and Receiver (with Splitter and Attenuator) Characterization Equipment Setup NI PXIe-5653 REF IN 10 MHz REF OUT 10 MHz REF OUT 100 MHz 1 3 LO3 800 MHz LO2 4 GHz LO1 3.2 GHz GHz OUT 1 RF Source 2 Power Meter mm (m)-to-2.92 mm (m) Cable 4 Power Sensor A 5 Power Splitter 6 20 db Attenuator mm (m)-to-2.92 mm (m) Adapter 4. Set the RF source power to -15 dbm. 5. Create a new session for the NI 5668R. NI PXIe-5698 Calibration Procedure National Instruments 9

10 6. Configure the NI 5668R according to the following fixed property settings. These settings remain unchanged during the test: Acquisition Type: Spectrum Averaging Mode: RMS averaging Reference Level: -5 RF Attenuation: 10 Mechanical Attenuation: 10 Number of Averages: 10 Digital IF Equalization Enabled: False Digitizer Dither Enabled: Enabled Ref Clock Source: PXI_Clk Channel Coupling: AC coupled Span: 100 khz Resolution Bandwidth: 1 khz Preamp Enabled: Disabled Device Instantaneous Bandwidth: 300 khz Preselector enabled: Disabled 7. Set the NI 5668R center frequency and the RF source frequency according to the first row of Table Commit the NI 5668R settings to hardware. 9. Take five readings of the RF source amplitude using power sensor A. Calculate the average power. 10. Repeat step 9 until any two readings measured differ no more than 0.02 db and no two averages differ by no more than db. Record the average as Measured Average Power. Note More than 30 averages total indicate a test failure that you must diagnose. 11. Read the NI 5668R power spectrum. Record the peak value of the spectrum as NI 5668R Power. 12. Calculate the Adjust RF Input Characterization Factor at each RF frequency in Table 5 using the following formula: Adjust RF Input Characterization Factor = NI 5668R Power - Measured Average Power 13. Repeat steps 7 to 12 for all remaining frequencies Table. 14. Repeat steps 1 to 13 with power sensor B. 15. Close the NI 5668R session. 10 ni.com NI PXIe-5698 Calibration Procedure

11 As-Found and As-Left Limits The as-found limits are the published specifications for the NI NI uses these limits to determine whether the NI 5698 meets the device specifications when it is received for calibration. The as-left limits are equal to the published NI specifications for the NI 5698, less guard bands for measurement uncertainty, temperature drift, and drift over time. NI uses these limits to determine whether the NI 5698 meets the device specifications over its calibration interval. Verification The performance verification procedures assume that adequate traceable uncertainties are available for the calibration references. In the event of a failure during the verification of the NI 5698, perform a calibration of the individual modules. Return the NI 5698 module to NI for calibration and adjustment, if needed. Verifying Bypass Insertion Loss Note Prior to starting this procedure, zero and calibrate the power sensor according to the Splitter and Attenuator Characterization section of this document. 1. Connect the RF source output to the power splitter input using the 2.92 mm (m)-to-2.92 mm (m) cable. 2. Connect power sensor A to the power splitter reference output. 3. Connect the other power splitter output to the NI 5698 RF IN connector using the 2.92 mm (m)-to-2.92 mm (m) adapter and 20 db attenuator. Refer to Figure 4 for a diagram showing the completed equipment setup. 4. Set the RF source power to -15 dbm. 5. Create a new session for the NI 5668R. 6. Create a new session for the NI Configure the NI 5668R according to the following fixed property settings. These settings remain unchanged during the procedure: Acquisition Type: Spectrum Averaging Mode: RMS averaging Reference Level: -5 RF Attenuation: 10 Mechanical Attenuation: 10 Number of Averages: 10 Digital IF Equalization Enabled: False Digitizer Dither Enabled: Enabled Ref Clock Source: PXI_Clk NI PXIe-5698 Calibration Procedure National Instruments 11

12 Channel Coupling: AC coupled Span: 100 khz Resolution Bandwidth: 1 khz Preamp Enabled: Disabled Device Instantaneous Bandwidth: 300 khz Preselector enabled: Disabled 8. Configure the NI 5698 Preamp Enabled fixed property settings to Disabled. 9. Set the NI 5668R and NI 5698 center frequency and the RF source frequency according to the first row in Table Commit the NI 5668R settings to hardware. 11. Commit the NI 5698 settings to hardware. 12. Take five readings of the RF source amplitude using power sensor B. Calculate the average power. 13. Repeat step 12 until any two readings measured differ no more than 0.02 db and no two averages differ by no more than db. This average is the Measured Average Power. 14. Calculate the Corrected Input Power using the following formula: Corrected Input Power = Measured Average Power + Adjust RF Input Characterization Factor Note More than 30 averages total indicate a test failure that you must diagnose. Note Adjust RF Input Characterization Factor was measured in the Splitter and Attenuator Characterization equipment characterization procedure. 15. Read the NI 5668R power spectrum. Record the peak value of the spectrum as NI 5668R Power. 16. Calculate the NI 5698 Bypass Path Insertion Loss at each RF frequency using the following formula: NI 5698 Bypass Path Insertion Loss = NI 5668R Power - Corrected Input Power 17. Repeat steps 9 to 16 for all remaining frequencies in Table Repeat steps 4 to 17 after configuring the NI 5698 Preamp Enabled fixed property settings to Disabled. 12 ni.com NI PXIe-5698 Calibration Procedure

13 19. Compare the NI 5698 Bypass Path Insertion Loss to the verification test limits in Table 2. Table 2. Bypass Path Insertion Loss Verification Test Limits (Preamplifier Disabled) Frequency As-Found Limits (db) As-Left Limits (db) 10 MHz to 200 MHz >200 MHz to 1 GHz >1 GHz to 2 GHz >2 GHz to 3 GHz >3 GHz to 3.6 GHz >3.6 GHz to 6 GHz >6 GHz to 9 GHz >9 GHz to 14 GHz >14 GHz to 20 GHz >20 GHz to 24 GHz >24 GHz to 26.5 GHz Close the NI 5698 session. 21. Close the NI 5668R session. Verifying Gain Note Prior to starting this procedure, zero and calibrate the power sensor according to the Splitter and Attenuator Characterization section of this document. 1. Connect the RF source output to the power splitter input using the 2.92 mm (m)-to-2.92 mm (m) cable. 2. Connect power sensor A to the power splitter reference output. 3. Connect the other power splitter output to the NI 5698 RF IN connector using the 2.92 mm (m)-to-2.92 mm (m) adapter and 20 db attenuator. Refer to Figure 4 for a diagram of the completed equipment setup. 4. Set the RF source power to -15 dbm. 5. Create a new session for the NI 5668R. 6. Create a new session for the NI Configure the NI 5668R according to the following fixed property settings. These settings remain unchanged during the test: Acquisition Type: Spectrum Averaging Mode: RMS averaging NI PXIe-5698 Calibration Procedure National Instruments 13

14 Reference Level: -5 RF Attenuation: 10 Mechanical Attenuation: 10 Number of Averages: 10 Digital IF Equalization Enabled: False Digitizer Dither Enabled: Enabled Ref Clock Source: PXI_Clk Channel Coupling: AC coupled Span: 100 khz Resolution Bandwidth: 1 khz Preamp Enabled: Disabled Device Instantaneous Bandwidth: 300 khz Preselector enabled: Disabled 8. Configure the NI 5698 Preamp Enabled fixed property settings to Enabled. 9. Set the NI 5668R and NI 5698 center frequency and the RF source frequency according to the first row in Table Commit the NI 5668R settings to hardware. 11. Commit the NI 5698 settings to hardware. 12. Take five readings of the RF source amplitude using power sensor B. Calculate the average power. 13. Repeat step 12 until any two readings measured differ no more than 0.02 db and no two averages differ by no more than db. This average is the Measured Average Power. 14. Calculate the Corrected Input Power using the following formula: Corrected Input Power = Measured Average Power + Adjust RF Input Characterization Factor Note More than 30 averages total indicate a test failure that you must diagnose. Note Adjust RF Input Characterization Factor was measured in the Splitter and Attenuator Characterization equipment characterization procedure. 15. Read the NI 5668R power spectrum. The NI 5668R Power is the peak value of that spectrum. 16. Calculate the NI 5698 Preamp Gain at each RF frequency using the following formula: NI 5698 Preamp Gain = NI 5668R Power - Corrected Input Power 17. Repeat steps 9 to 16 for all remaining frequencies in Table ni.com NI PXIe-5698 Calibration Procedure

15 18. Repeat steps 4 to 17 after configuring the NI 5698 Preamp Enabled fixed property settings to Enabled. 19. Compare the NI 5698 Preamp Gain to the verification test limits in Table Close the NI 5698 session. 21. Close the NI 5668R session. If the gain verification procedures determines that the NI 5698 is outside its limits, refer to Worldwide Support and Services for information about support resources or service requests. Adjustment Table 3. Gain Verification Test Limits (Preamplifier Enabled) Frequency As-Found Limits (db) As-Left Limits (db) 10 MHz to 200 MHz >200 MHz to 1 GHz >1 GHz to 2 GHz >2 GHz to 3 GHz >3 GHz to 3.6 GHz >3.6 GHz to 6 GHz >6 GHz to 9 GHz >9 GHz to 14 GHz >14 GHz to 20 GHz >20 GHz to 24 GHz >24 GHz to 26.5 GHz 10 9 This section describes the steps needed to adjust the NI Following the adjustment procedure automatically updates the calibration date and temperature in the EEPROM of the NI When adjusting bypass path insertion loss, the RF frequency passes through the bypass path. When adjusting RF gain, the RF frequency is swept through the preamplifier paths. The meter measures the RF input power as shown in RF Source Power and Receiver (with Splitter and Attenuator) Characterization Equipment Setup. The NI 5668R measures the power output through the NI 5698 RF OUT terminal to determine the overall gain of the NI The digitizer and power meter provide the information you need to calculate gain through the NI NI PXIe-5698 Calibration Procedure National Instruments 15

16 Use the NI-RFSA calibration API for the following adjustment procedures. Using RF list mode on the RF signal generator improves the measurement speed. NI-RFSA calibration API stores the results in the EEPROM. Note NI recommends a complete adjustment of your device to renew the calibration interval. Adjustment corrects the following NI 5698 specifications: Insertion loss of bypass path RF gain for frequencies: 10 MHz to 26.5 GHz Initial Connections Refer to the NI 5698 RF Preamplifier Getting Started Guide for more information on how to install the NI 5698 with the NI 5668R. Figure 3. NI 5698 Connected to NI 5668R NI PXIe-5698 RF Preamplifier NI PXIe-5653 Synthesizer ACCESS ACTIVE ACCESS ACTIVE ACCESS ACTIVE NOISE SOURCE 0/28 VDC 0 VDC + 20 dbm MAX > 10 MHz +10 dbm MAX < 10 MHz REF IN 10 MHz 5 V p-p MAX REF OUT 10 MHz 1.5 V p-p MAX RF IN +17 dbm MAX ±10 VDC REF OUT 100 MHz 1.5 V p-p MAX LO3 800 MHz 1 RF OUT +25 dbm MAX 0 VDC LO2 4 GHz 10 MHz 26.5 GHz LO1 3.2 GHz GHz OUT ESD SENSITIVE ALL PORTS 50 1 Semi-rigid 2.92 mm-to-2.92 mm Coaxial Cable 16 ni.com NI PXIe-5698 Calibration Procedure

17 RF Preamplifier ACCESS 0/28 VDC ±10 VDC 0 VDC ACTIVE 10 MHz 26.5 GHz ACCESS ACTIVE 0 VDC + 20 dbm MAX > 10 MHz +10 dbm MAX < 10 MHz ACCESS ACTIVE 5 V p-p MAX 1.5 V p-p MAX 100 MHz 1.5 V p-p MAX Synthesizer ESD SENSITIVE ALL PORTS 50 Adjusting Bypass Path Insertion Loss Calibration Note Zero and calibrate the power sensor using the procedures in the Characterizing the RF Source Power section of this document prior to starting this procedure. 1. Create and initialize an external calibration session using the appropriate password. The default password for password-protected operations is NI. 2. Connect the RF source output to the power splitter input using the 2.92 mm (m)-to-2.92 mm (m) cable. 3. Connect power sensor B to the power splitter reference output. 4. Connect the other power splitter output to the NI 5698 RF IN connector using the 2.92 mm (m)-to-2.92 mm (m) adapter and 20 db attenuator. Refer to Figure 4 for a diagram of the completed equipment setup. Figure 4. Adjustment Setup for Insertion Loss and RF Gain NI PXIe-5698 NI PXIe-5653 NOISE SOURCE REF IN 10 MHz REF OUT 10 MHz RF IN +17 dbm MAX REF OUT LO3 800 MHz 1 3 RF OUT +25 dbm MAX LO2 4 GHz LO1 3.2 GHz GHz OUT 1 RF Source 2 Power Meter mm (m)-to-2.92 mm (m) Cable 4 Power Sensor A 5 Power Splitter 6 20 db Attenuator mm (m)-to-2.92 mm (m) Adapter 5. Set the RF source power to -15 dbm. 6. Create a new session for the NI 5668R. 7. Create a new session for the NI NI PXIe-5698 Calibration Procedure National Instruments 17

18 8. Configure the NI 5668R according to the following fixed property settings. These settings remain unchanged during the procedure: Acquisition Type: Spectrum Averaging Mode: RMS averaging Reference Level: -5 RF Attenuation: 10 Mechanical Attenuation: 10 Number of Averages: 10 Digital IF Equalization Enabled: False Digitizer Dither Enabled: Enabled Ref Clock Source: PXI_Clk Channel Coupling: AC coupled Span: 100 khz Resolution Bandwidth: 1 khz Preamp Enabled: Disabled Device Instantaneous Bandwidth: 300 khz Preselector enabled: Disabled 9. Configure the NI 5698 Preamp Enabled fixed property settings to Disabled. This setting remains unchanged during the test. 10. Set the NI 5668R and NI 5698 center frequency and the RF source frequency according to the first row in Table Commit the NI 5668R settings to hardware. 12. Commit the NI 5698 settings to hardware. 13. Take five readings of the RF source amplitude using power sensor B. Calculate the average power. 14. Repeat step 13 until any two readings measured differ no more than 0.02 db and no two averages differ by no more than db. This average is the Measured Average Power. Note More than 30 averages total indicate a test failure that you must diagnose. 15. Calculate the Corrected Input Power using the following formula: Corrected Input Power = Measured Average Power + Adjust RF Input Characterization Factor Note Adjust RF Input Characterization Factor was measured in the Splitter and Attenuator Characterization equipment characterization procedure. Use the values that correspond to the frequency range you are testing. 18 ni.com NI PXIe-5698 Calibration Procedure

19 16. Read the NI 5668R power spectrum. Record the peak value of the spectrum as NI 5668R Power. 17. Calculate the NI 5698 Bypass Gain at each RF frequency using the following formula: NI 5698 Bypass Gain = NI 5668R Power - Corrected Input Power 18. Repeat steps 10 to 17 for all remaining frequencies in Table Close the calibration session. 20. Close the NI 5698 session. 21. Close the NI 5668R session. Adjusting RF Gain for Frequencies 10 MHz to 26.5 GHz Note Zero and calibrate the power senor using the procedures in the Characterizing the RF Source Power section of this document prior to starting this procedure. 1. Create and initialize an external calibration session using the appropriate password. The default password for password-protected operations is NI. 2. Connect the RF source output to the power splitter input using the 2.92 mm (m)-to-2.92 mm (m) cable. 3. Connect power sensor B to the power splitter reference output. 4. Connect the other power splitter output to the NI 5698 RF IN connector using the 2.92 mm (m)-to-2.92 mm (m) adapter and 20 db attenuator. Refer to Figure 4 for a diagram of the completed equipment setup. 5. Set the RF source power to -15 dbm. 6. Create a new session for the NI 5668R. 7. Create a new session for the NI Acquisition Type: Spectrum Averaging Mode: RMS averaging Reference Level: -5 RF Attenuation: 10 Mechanical Attenuation: 10 Number of Averages: 10 Digital IF Equalization Enabled: False Digitizer Dither Enabled: Enabled Ref Clock Source: PXI_Clk Channel Coupling: AC coupled Span: 100 khz NI PXIe-5698 Calibration Procedure National Instruments 19

20 Resolution Bandwidth: 1 khz Preamp Enabled: Disabled Device Instantaneous Bandwidth: 300 khz Preselector enabled: Disabled 8. Configure the NI 5698 Preamp Enabled fixed property settings to Enabled. These settings remain unchanged during the test. 9. Set the NI 5668R and NI 5698 center frequency and the RF source frequency according to the first row in Table Commit the NI 5668R settings to hardware. 11. Commit the NI 5698 settings to hardware. 12. Take five readings of the RF source amplitude using power sensor B. Calculate the average power. 13. Repeat step 12 until any two readings measured differ no more than 0.02 db and no two averages differ by no more than db. This average is the Measured Average Power. Note More than 30 averages total indicate a test failure that you must diagnose. 14. Calculate the Corrected Input Power using the following formula: Corrected Input Power = Measured Average Power + Adjust RF Input Characterization Factor Note Adjust RF Input Characterization Factor was measured in the Splitter and Attenuator Characterization equipment characterization procedure. 15. Use the values that correspond to the frequency range you are testing. 16. Read the NI 5668R power spectrum. Record the peak value of the spectrum as NI 5668R Power. 17. Calculate the NI 5698 Preamp Gain at each RF frequency using the following formula: NI 5698 Preamp Gain = NI 5668R Power - Corrected Input Power 18. Repeat steps 10 to 17 for all remaining frequencies in Table Close the calibration session. 20. Close the NI 5698 session. 21. Close the NI 5668R session. 20 ni.com NI PXIe-5698 Calibration Procedure

21 Reverification Repeat the Verification section to determine the as-left status of the device. Note If any test fails reverification after performing an adjustment, verify that you have met the Test Conditions before returning your device to NI. Refer to Worldwide Support and Services for information about support resources or service requests. Appendix A: NI 5698 Configuration Table Table 4. NI RF Configuration Frequencies Start Frequency Stop Frequency Step Size 10 MHz 100 MHz 10 MHz 100 MHz 3.6 MHz 100 MHz 3.6 GHz 8.0 GHz 200 MHz 8.0 GHz 16.0 GHz 200 MHz 16.0 GHz 20.0 GHz 200 MHz 20.0 GHz 26.5 GHz 200 MHz Appendix B: Power Sensor Calibration Factor Uncertainty Table 5. Power Sensor Calibration Factor Uncertainty (2σ) Frequency (GHz) Calibration Factor Uncertainty (%) < < < < < < < <1.04 NI PXIe-5698 Calibration Procedure National Instruments 21

22 Table 5. Power Sensor Calibration Factor Uncertainty (2σ) (Continued) Frequency (GHz) Calibration Factor Uncertainty (%) 3.00 < < < < < < < < < < < < < < < < < < < < < < < < < ni.com NI PXIe-5698 Calibration Procedure

23 Worldwide Support and Services The NI website is your complete resource for technical support. At ni.com/support you have access to everything from troubleshooting and application development self-help resources to and phone assistance from NI Application Engineers. Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and other services. Visit ni.com/register to register your NI product. Product registration facilitates technical support and ensures that you receive important information updates from NI. A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer s declaration of conformity. This system affords the user protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC for your product by visiting ni.com/certification. If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration. NI corporate headquarters is located at North Mopac Expressway, Austin, Texas, NI also has offices located around the world. For telephone support in the United States, create your service request at ni.com/support or dial ASK MYNI ( ). For telephone support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, addresses, and current events. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI 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. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR , DFAR , and DFAR National Instruments. All rights reserved A-01 Apr16