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N5231A PNA-L Microwave Network Analyzer, 13.5 GHz
Category:
Network analyzer
Desktop network analyzer
Product Attachment:
- Product Description
- Selection
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- Brand: 是德科技
- Commodity name: N5231A PNA-L Microwave Network Analyzer, 13.5 GHz
- Brand: Keysight Technologies
In-depth Analysis of the Keysight N5231A PNA-L Microwave Network Analyzer
I. Core Technical Parameters and Positioning
II. Typical Application Scenarios and Adaptability Analysis
- Passive Component Testing ：
- S-parameter measurement of filters (such as 5G Sub-6GHz bandpass filters), couplers, and power dividers.
- Frequency response analysis of dielectric resonators (DROs), with accuracy up to 0.01Hz.
- Simple Active Component Evaluation ：
- Gain flatness testing of low-noise amplifiers (LNAs), such as gain fluctuation < 0.5dB for 6GHz Wi-Fi modules.
- Conversion loss and port isolation testing of mixers, such as LO-IF isolation > 30dB.
- Material and Cable Characterization ：
- Measurement of insertion loss (e.g., loss < 0.8dB/m at 13.5GHz) and voltage standing wave ratio (VSWR < 1.2) of RF cables.
- Extraction of complex permittivity of dielectric materials (such as FR4 substrates) using reflection/transmission methods.
- Cannot cover the millimeter-wave frequency band (such as above 24GHz). 76-81GHz automotive radar testing requires upgrading to the N5240A or higher model.
- For millimeter-wave expansion, an external down-conversion module can be used, but this will introduce additional loss (e.g., > 3dB at 20GHz).
III. Key Considerations for High-Frequency Testing
- Standard N-type (50Ω) interface. High-frequency testing requires the use of low-loss, phase-stable cables (such as the Keysight 85133D series) to avoid the loss of ordinary N-type cables above 10GHz (ordinary N-type cables have a loss > 0.6dB/m at 13.5GHz).
- Calibration Fixture Selection:
- Below 13.5GHz: Use the 125A series N-type precision calibration kit (covering 10MHz-18GHz).
- If an external module is used to expand to 20GHz: A 3.5mm precision calibration kit (such as 125B-265) is required.
- Electronic calibration (ECal) is implemented via the 85032E module for fast calibration (<30 seconds), reducing manual calibration errors (such as directivity error < 0.05dB).
- Testing is recommended at 23±2℃ to avoid temperature drift causing measurement fluctuations (a 1℃ drift causes a 0.01dB amplitude error).
- For higher frequency or extended functionality, consider upgrading to the N5231B (13.5GHz, supports touchscreen and automated testing) or N5222A (9kHz-20GHz, supports vector signal analysis).
IV. Discontinuation and Support Status
- The N5231A entered the "limited support" phase in June 2024, and repair and calibration services are gradually being reduced.
- Keysight Technologies hardware/firmware upgrade program is recommended for migration to the B model, at a cost of only 30-50% of a new product.
- Fully compatible with the N5230C; existing test codes and fixtures can be reused directly, protecting users' existing investments.
V. Summary: Selection Decision Reference
- Recommended Scenarios ：
- University laboratories or small and medium-sized enterprise R&D with limited budgets but requiring coverage of frequencies below 13.5GHz.
- Mass production testing of Sub-6GHz RF components (such as filters and antennas).
- Preliminary evaluation of simple active devices (such as LNAs and mixers).
- Pitfalls to Avoid ：
- Avoid use for testing above 13.5GHz (such as 5G millimeter wave).
- High-frequency testing requires low-loss cables and high-precision calibration components to ensure system error < 0.1dB.
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I. Hardware Characteristics and Option Configurations
1. Basic Parameters and Performance
- Frequency Coverage : 300 kHz to 13.5 GHz, suitable for testing wideband components such as filters, antennas, and amplifiers.
- Dynamic Range : At 20 GHz, it reaches 133 dB with trace noise as low as 0.004 dB rms (1 kHz IFBW), supporting high-precision, low-loss measurements.
- Output Power : Extended power range to -55 to +13 dBm with a built-in 60 dB step attenuator, meeting the needs of amplifier linearity/nonlinearity characteristic analysis.
- Scan Speed ： 6 ms/201 points supporting fast batch testing.
2. Calibration and Accessories
- Mechanical Calibration Kit
- 85052D : 3.5 mm calibration kit, covering 300 kHz to 20 GHz, supporting SOLT calibration.
- 85052D-001 : 2.4 mm calibration kit, suitable for high-frequency testing (such as 40/50 GHz expansion).
- Electronic Calibration (ECal) Module
- N4691A : Single-connection fast calibration, supporting 2 ports, reducing human operational errors.
- Test Cable
- 85131F : 3.5 mm flexible test cable, suitable for the 300 kHz to 20 GHz band, ensuring signal integrity.
3. Function Expansion Options
- -010 Time Domain Measurement : Supports pulse signal analysis (such as radar module dynamic response), with pulse width as low as 2 μs.
- -080 Frequency Offset Measurement : Analyzes the frequency conversion loss and distortion characteristics of mixers/amplifiers.
- -416 4-Port Configuration : Integrates a configurable test device, supporting S-parameter measurement of multi-port networks.
- -1CP Rack Mounting Kit : Adaptable to standard 19-inch cabinets, improving production line integration.
- -UK6 Calibration Certificate : Provides an official calibration report with test data, meeting quality certification requirements.
II. Software Functions and Application Scenarios
1. Advanced Measurement Functions
- Fixture De-embedding : Through TRL/LRM Calibration eliminates the influence of the test fixture, suitable for high-precision measurement of wafer-level and packaged devices.
- Mixer/Converter Testing : Built-in wizard automatically measures frequency conversion loss, local oscillator (LO) leakage, and other parameters, simplifying radio frequency front-end design verification.
- Multi-Mode Scanning : Supports linear/logarithmic/power scanning, adapting to the testing needs of different devices such as filters, antennas, and amplifiers.
2. Automation and Compatibility
- Built-in VBA Programming : Customizes test scripts, batch executes multi-port S-parameter scanning, data storage, and report generation.
- Spectrum Analysis Function : Through the option -090 integrates a spectrum analyzer, realizing joint analysis of signal integrity and frequency domain characteristics.
3. Typical Applications
- Wireless Communication
- Tests the in-band loss and out-of-band suppression characteristics of 5G intermediate frequency filters.
- Evaluates the S-parameters and signal integrity of Wi-Fi 6E antennas.
- Materials and Semiconductors
- Analyzes the dielectric constant and loss characteristics of high-frequency substrates (such as FR4, PTFE), supporting TRL calibration.
- Combines with a wafer probe station to perform S-parameter testing of on-chip components (such as radio frequency transistors).
- Education and Research
- Basic radio frequency teaching experiments (such as Smith chart analysis, impedance matching).
- Low-cost solution development, suitable for budget-sensitive laboratory environments.
III. Discontinued Status and Replacement Suggestions
- N5231B Supports an intuitive graphical interface and a fast calibration process, suitable for scenarios requiring high integration and ease of operation.
- N5232B Expands the frequency to 20 GHz, compatible with existing test fixtures and scripts, suitable for high-frequency component development.
IV. Configuration Suggestions
- Basic RF Testing Optional -010 (Time domain measurement) + 85052D Calibration kit + N4691A ECal module.
- Material Analysis Optional -010 + 85052D-001 High-frequency calibration kit + dielectric test fixture (e.g., Keysight 16453A).
- Automated Production Line Optional -1CP (Rack mount) + -416 (4-port configuration) + Customized VBA script.
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