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CALIBRATION PROCEDURE
NI PXIe-5694
This document contains the verification and adjustment procedures for the National Instruments
PXIe-5694 IF conditioning module (NI 5694). Refer to
information about calibration solutions.
Contents
Software.................................................................................................................................... 2
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 8
Initial Setup............................................................................................................................... 8
As-Found and As-Left Limits................................................................................................... 8
Characterization........................................................................................................................ 9
Determining Power Splitter Reference Output................................................................. 9
Calibrating Power Sensor Zero Settings........................................................................... 9
Characterizing RF Source Power ..................................................................................... 9
Synchronizing the Signal Generators ....................................................................... 9
Configuring the Hardware ........................................................................................ 10
Characterizing the Source Signal Power Levels....................................................... 11
Characterizing the Source 2 Signal Correction Level .............................................. 12
Characterizing Cable Loss................................................................................................ 14
Verification............................................................................................................................... 22
Synchronizing the Components........................................................................................ 22
Configuring the Hardware ................................................................................................ 22
Verifying Third-Order Intercept Point Out-of-Band ........................................................ 24
Determining the Path Gain ....................................................................................... 24
At Multiple Input Power Levels ............................................................................ 27
Adjustment................................................................................................................................ 32
Configuring the Hardware ................................................................................................ 32
Adjusting IF Gain for Bypass Path................................................................................... 33
Adjusting IF Gain ............................................................................................................. 34
Adjusting IF Flatness........................................................................................................ 37
Reverification ........................................................................................................................... 40
Worldwide Support and Services ............................................................................................. 40
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Summary of Contents for National Instruments PXIe-5694
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Page 1: Table Of Contents
CALIBRATION PROCEDURE NI PXIe-5694 This document contains the verification and adjustment procedures for the National Instruments PXIe-5694 IF conditioning module (NI 5694). Refer to for more ni.com/calibration information about calibration solutions. Contents Software............................ 2 Documentation.......................... 2 Test Equipment......................... 2 Test Conditions......................... 8 Initial Setup.......................... -
Page 2: Software
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 the table. 2 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 3 Table 1. Recommended Equipment for NI 5694 Calibration Recommended Equipment Model Where Used Minimum Requirements Power meter Anritsu ML2438A Characterizing RF source power Display resolution: ≤0.01 dB Characterizing cable loss Settling: ±0.1% Verifying third-order intercept point Instrumentation accuracy: <±0.5% out-of-band Noise, zero set, and drift: ≤±0.5% full-scale Adjusting IF gain for bypass path (lowest range)
- Page 4 Table 1. Recommended Equipment for NI 5694 Calibration (Continued) Recommended Equipment Model Where Used Minimum Requirements IF digitizer NI PXIe-5622 Adjusting IF gain for bypass path 198941D-0XL Adjusting IF gain Adjusting IF flatness Signal generators Anritsu MG3692C Characterizing RF source power Frequency range: 8 MHz to 270 MHz (quantity: 2, Options 2A, 3, 4, 15A,...
- Page 5 Table 1. Recommended Equipment for NI 5694 Calibration (Continued) Recommended Equipment Model Where Used Minimum Requirements SMA (m)-to- MegaPhase Characterizing RF source power Length: 36 in. SMA (m) cable G916-SISI-36 Characterizing cable loss Frequency range: DC to 18 GHz (quantity: 4) Verifying third-order intercept point Insertion loss: ≤2 dB at 18 GHz out-of-band...
- Page 6 Table 1. Recommended Equipment for NI 5694 Calibration (Continued) Recommended Equipment Model Where Used Minimum Requirements 3.5 mm (m)-to- Huber+Suhner Verifying third-order intercept point Frequency range: DC to 33 GHz 3.5 mm (m) adapter 32_PC35-50-0-2/ out-of-band Impedance: 50 Ω 199_NE Adjusting IF gain for bypass path Return loss: Adjusting IF gain...
- Page 7 Table 1. Recommended Equipment for NI 5694 Calibration (Continued) Recommended Equipment Model Where Used Minimum Requirements Power splitter Aeroflex/Weinschel Characterizing RF source power Frequency range: DC to 26.5 GHz (2 resistor type) 1593 Characterizing cable loss Amplitude tracking: <0.25 dB Adjusting IF gain for bypass path Phase tracking: <4°...
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Page 8: Test Conditions
The as-left limits are equal to the published NI specifications for the NI 5694, less guard bands for measurement uncertainty, temperature drift, and drift over time. NI uses these limits to reduce the probability that the instrument is no longer calibrated at the end of the calibration cycle. 8 | ni.com | NI PXIe-5694 Calibration Procedure... -
Page 9: Characterization
Use a BNC (m)-to-BNC (m) cable. Configure the spectrum analyzer to use the external reference. On the Rohde & Schwarz FSU26 analyzer, press the Setup button and select External Reference. NI PXIe-5694 Calibration Procedure | © National Instruments | 9... -
Page 10: Configuring The Hardware
Connect channel A of the power meter to power sensor A. Figure 1. Configuration for Power Level Characterization RF Source 1 Low-Frequency Combiner Power Meter SMA (m)-to-SMA (m) Cable Power Sensor A 10 dB Attenuator RF Source 2 10 | ni.com | NI PXIe-5694 Calibration Procedure... -
Page 11: Characterizing The Source Signal Power Levels
Table 2. Retain this information for use during the verification procedures. Ensure that the RF source 1 generator output is OFF and the RF source 2 generator output is ON. NI PXIe-5694 Calibration Procedure | © National Instruments | 11... -
Page 12: Characterizing The Source 2 Signal Correction Level
Record the power level reading on the power meter in the Power Meter Reference cell corresponding to the appropriate frequency. Repeat steps 3 and 4 for the remaining frequency listed in Table 4. Remove the power sensor from the combiner. 12 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 13 12. For each of the two frequencies in Table 4, subtract the value in the Power Meter Reference cell from the value in the Spectrum Analyzer cell and record it in the Correction cell. NI PXIe-5694 Calibration Procedure | © National Instruments | 13...
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Page 14: Characterizing Cable Loss
Frequency: The first frequency listed in the Frequency column in Table 5 Table 5. Digitizer Cable Loss Reference Splitter RF Source Frequency Source Digitizer Cable Tracking Error Cable / Splitter (MHz) Measurement Loss (dB) Loss (dB) 14 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 15 Cable / Splitter (MHz) Measurement Loss (dB) Loss (dB) 107.5 109.1 110.7 112.3 113.9 115.5 117.1 117.5 119.1 120.7 122.3 123.9 125.5 127.1 128.7 130.3 131.9 133.5 135.1 136.6 138.2 NI PXIe-5694 Calibration Procedure | © National Instruments | 15...
- Page 16 Cable / Splitter (MHz) Measurement Loss (dB) Loss (dB) 139.8 141.4 144.6 146.2 147.8 149.4 152.5 152.6 154.1 155.7 157.3 158.9 160.5 162.1 163.7 165.3 166.9 168.5 170.1 171.6 173.2 174.8 176.4 16 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 17 Cable / Splitter (MHz) Measurement Loss (dB) Loss (dB) 179.6 181.2 182.8 184.4 187.6 189.2 190.8 192.4 193.6 195.2 196.8 198.4 201.6 203.2 204.8 206.4 209.6 211.2 212.8 213.5 214.4 215.1 NI PXIe-5694 Calibration Procedure | © National Instruments | 17...
- Page 18 Cable / Splitter (MHz) Measurement Loss (dB) Loss (dB) 216.7 218.3 219.9 221.5 223.1 224.7 226.3 228.6 230.2 231.8 233.4 236.6 238.2 239.8 240.5 241.4 242.1 243.7 245.3 246.9 248.5 250.1 251.7 253.3 18 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 19 Repeat steps 4 and 5 for each frequency listed in Table 5. Disconnect power sensor B from the RF source 1 output. Connect the 3.5mm (m)-to-3.5mm (m) digitizer cable to the RF source 1 output. NI PXIe-5694 Calibration Procedure | © National Instruments | 19...
- Page 20 14. Connect the RF source 1 output to the power splitter input. Use a 3.5 mm (m)-to-3.5 mm (m) RF source cable. 15. Connect the power splitter reference output to power sensor A. 20 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 21 RF Source Cable/Splitter Loss = Reference Source Measurement - Channel B Power where Reference Source Measurement is the corresponding measurement recorded in Table 5 for the frequency. 20. Repeat steps 17 through 19 for each frequency in Table 5. NI PXIe-5694 Calibration Procedure | © National Instruments | 21...
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Page 22: Verification
Connect the low-frequency combiner common connector to the NI 5694 IF IN connector. Use a 3.5 mm (m)-to-3.5 mm adapter. The 3.5 mm (m)-to-3.5 mm adapter is uncharacterized and represents an Note uncertainty. This uncertainty is absorbed into the product specifications. 22 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 23 +10 dBm NOM 12 VDC MAX SENSITIVE RF Source 1 Low-Frequency Combiner RF Source 2 SMA (m)-to-SMA (m) Cable NI 5694 Spectrum Analyzer 10 dB Attenuator SMA (m)-to-SMA (m) Cable NI PXIe-5694 Calibration Procedure | © National Instruments | 23...
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Page 24: Verifying Third-Order Intercept Point Out-Of-Band
Step gain: The value in the Step Gain column in Table 6 corresponding to the configured device instantaneous bandwidth Table 6. Path Gain, Downconversion Disabled Device Instantaneous IF OUT Power Bandwidth (Path) Step Gain (dBm) Path Gain Disabled 20 MHz Enabled Disabled 5 MHz Enabled 24 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 25 Reconfigure the spectrum analyzer as follows: • Center frequency: 21.4 MHz • Span: 0 Hz • Reference level: 10 dBm • Resolution bandwidth: 10 kHz • Video bandwidth: 30 kHz • Number of averages: 100 NI PXIe-5694 Calibration Procedure | © National Instruments | 25...
- Page 26 11. Use the formula from step 6 to compute the path gain and record it in the corresponding Path Gain cell in Table 7. 12. Repeat steps 9 through 11 for each of the remaining values in the Device Instantaneous Bandwidth column in Table 7. 26 | ni.com | NI PXIe-5694 Calibration Procedure...
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Page 27: Verifying Third-Order Intercept Point Out-Of-Band At Multiple Input Power Levels
TOI-OB (dBm) 223.6 253.6 20 MHz 163.6 133.6 201.1 208.6 5 MHz 186.1 178.6 195.7 197.8 1.4 MHz 191.5 189.4 194.2 194.8 400 kHz 192.4 193.765 193.93 110 kHz 193.51 193.27 NI PXIe-5694 Calibration Procedure | © National Instruments | 27... - Page 28 = The value recorded in the Path Gain column in Table 6 for the configured device instantaneous bandwidth with step gain disabled 11. Repeat step 10 for each combination of frequencies listed in Table 8. 12. Reconfigure the NI 5694, enabling step gain. 28 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 29 193.765 193.93 110 kHz 193.435 193.51 14. Reconfigure the spectrum analyzer for a frequency of 21.4 MHz. 15. Reconfigure the NI 5694, enabling IF conditioning downconversion and disabling step gain. NI PXIe-5694 Calibration Procedure | © National Instruments | 29...
- Page 30 Device RF Source 1 RF Source 2 IF OUT Instantaneous Frequency Frequency Power TOI-OB Bandwidth (Path) (MHz) (MHz) (dBm) (dBm) 201.1 208.6 5 MHz 186.1 178.6 195.7 197.8 1.4 MHz 191.5 189.4 30 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 31 * The as-left limits cannot be linearly combined with the measurement uncertainty values to equal the warranted device specifications. Refer to the As-Found and As-Left Limits section of this document for more information about as-left limits NI PXIe-5694 Calibration Procedure | © National Instruments | 31...
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Page 32: Adjustment
Complete the following procedures to adjust the NI 5694. Following the adjustment procedures automatically updates the calibration date and temperature in the EEPROM of the NI 5694. National Instruments recommends a complete adjustment of your device to Note renew the calibration interval. -
Page 33: Adjusting If Gain For Bypass Path
10. Read the power meter channel A power. 11. Calculate the NI 5694 IF input power using the following equation: IF Input Power = Channel A Power + Splitter Tracking at RF Source Frequency NI PXIe-5694 Calibration Procedure | © National Instruments | 33... -
Page 34: Adjusting If Gain
Initialize an external calibration session for the NI 5694. Initialize an IF attenuation calibration step. Configure the NI 5694 as follows: • Signal conditioning: Enabled • Reference source: PXI_Clk • IF conditioning downconversion: Disabled • Step gain: Disabled 34 | ni.com | NI PXIe-5694 Calibration Procedure... - Page 35 = Real part of the jth complex sample = Imaginary part of the jth complex sample 15. Query the NI 5622 digitizer frequency response and retrieve the value at 193.6 MHz by linear interpolation. NI PXIe-5694 Calibration Procedure | © National Instruments | 35...
- Page 36 In step 15, query the digitizer response at 21.4 MHz instead of 193.6 MHz • In step 19, add 30 kHz to the list of frequencies to measure 29. Close the IF attenuation calibration step. 30. Close the external calibration session. 36 | ni.com | NI PXIe-5694 Calibration Procedure...
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Page 37: Adjusting If Flatness
Reference source: PXI_Clk • Reference Clock rate: 100 MHz • DDC enabled: TRUE • Data processing mode: Complex • Frequency translation enabled: TRUE • Dither enabled: TRUE • Bandpass filter enabled: TRUE NI PXIe-5694 Calibration Procedure | © National Instruments | 37... - Page 38 14. Read the power meter channel A power. 15. Calculate the NI 5694 IF input power using the following equation: Input Power = Channel A Power + Splitter Tracking at Current RF Source Frequency 38 | ni.com | NI PXIe-5694 Calibration Procedure...
- Page 39 In step 23, add 30 kHz to the list of frequencies to measure 30. Reconfigure RF source 1 for a power level of -25 dBm. 31. Reconfigure the NI 5694, enabling step gain. NI PXIe-5694 Calibration Procedure | © National Instruments | 39...
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Page 40: Reverification
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.