Agilent/Keysight P9371B

The Keysight P9371B is a 2-port vector network analyzer delivering S-parameter measurements across 9 kHz to 6.5 GHz in a portable, faceless form factor. Controlled via external PC through Thunderbolt 3, this instrument combines benchtop VNA capability with reduced physical footprint and sub-2 kg weight. It operates with 1 Hz frequency resolution and 8 dBm typical output power, employing measurement science and GUI architecture shared with higher-end Keysight VNA platforms to ensure consistency across instrument families.

Technical Specifications

• Frequency Range: 9 kHz to 6.5 GHz


• Frequency Resolution: 1 Hz


• Output Power: 8 dBm (typical)


• Ports: 2


• Test Port Connectors: 3.5 mm (female)


• Dimensions: 48 mm × 176 mm × 333 mm


• Weight: Less than 2 kg


• Primary Interface: Thunderbolt 3 to external PC


• Secondary Interfaces: USB, MCX

Key Features

• Measures all four S-parameters (S11, S12, S21, S22) for two-port devices


• Time domain analysis via software applications

TDR and TDT modes supported

• Automatic Fixture Removal (AFR) application for passive component characterization


• Electronic calibration (ECal) module support for rapid calibration cycles


• Mechanical calibration module support for enhanced measurement accuracy


• Scalar mixer/converter calibrated measurements via software applications


• Cascadable architecture: two P93xxB units can be configured for up to 8-port operation with additional licensing and cabling


• No internal data storage - design suitable for secure or restricted-access environments


• VNA activation software included; multiport calibration assistant software available

Typical Applications S-parameter characterization of RF and microwave components and subsystems across consumer, industrial, and aerospace frequency ranges. Time-domain reflectometry for transmission line analysis and impedance discontinuity localization. Passive filter, amplifier, and mixer evaluation.

Compatibility & Integration Requires Windows 10 (64-bit only), Version 1909 or later. PC-controlled operation via Thunderbolt 3 provides measurement data processing and instrument control from standard workstation hardware.