Anritsu 37225B Vector Network Analyzer (40 MHz to 13.5 GHz)

The Anritsu 37225B is a microprocessor-controlled vector network analyzer that integrates signal source, test set, and analyzer subsystem into a single compact unit for S-parameter measurements from 40 MHz to 13.5 GHz. Four independent measurement channels deliver configurable parameter sets (S11, S21, S22, S12, or custom a1/a2/b1/b2 combinations) across up to 1601 data points with 500 ms measurement time at 101 points typical. The instrument achieves 101 dB receiver dynamic range at 2 GHz and 13.5 GHz, with system dynamic range extending to 98 dB across the same band.

A large LCD color display or external VGA monitor presents results in multiple formats: log magnitude, phase, Smith chart (impedance/admittance), log polar, group delay, linear magnitude, real/imaginary components, and SWR. Six independent markers with delta measurement capability and user-definable single or segmented limit lines support critical component validation and production testing. Built-in hard-disk drive stores front panel setups, measurement data, and calibration records for rapid setup recall.

Technical Specifications

• Frequency range: 40 MHz to 13.5 GHz


• Measurement data points: Up to 1601


• Measurement channels: Four independent


• Measurement parameters: S11, S21, S22, S12, or user-defined combinations of a1, a2, b1, b2


• Measurement time: 500 ms for 101 data points across full span (typical)


• Port 1 output power: 0 dBm (40 MHz to 13.5 GHz)


• Maximum input to Port 2: +20 dBm @ 40 MHz; +3 dBm @ 2 GHz to 13.5 GHz


• Noise floor: −70 dBm @ 40 MHz; −98 dBm @ 2 GHz and 13.5 GHz


• Receiver dynamic range: 90 dB @ 40 MHz; 101 dB @ 2 GHz and 13.5 GHz


• System dynamic range: 70 dB @ 40 MHz; 98 dB @ 2 GHz and 13.5 GHz


• High level noise: <0.03 dB and <0.4° peak-to-peak (1 kHz IF bandwidth, typical)

Key Features

• Six independent markers with selectable reference for delta measurements


• Enhanced marker functions for level and bandwidth detection


• Marker sweep capability


• User-definable limit lines (single or segmented)


• Display format flexibility: log magnitude, phase, Smith chart, log polar, group delay, linear magnitude, real/imaginary, SWR


• Built-in hard-disk drive for data and setup storage

Compatibility & Integration

• Two GPIB ports: system GPIB (IEEE-488.2) for external controller programming; dedicated GPIB for plotters, frequency counters, synthesizers, power meters


• GPIB address range: 1 to 30


• Data transfer formats: ASCII, 32-bit floating point, 64-bit floating point