Agilent/Keysight U4204A

The Keysight U4204A is a 34-channel connectorless logic analyzer probe designed for direct connection to devices under test with minimal signal path impedance. Part of the Soft Touch Pro Series, this probe integrates with the 16850A Series portable logic analyzers to enable detailed digital signal analysis and hardware debugging of complex embedded systems. The U4204A accepts single-ended data signals and single-ended or differential clock signals through a 160-pin direct-connect interface, supporting measurement amplitudes of 200 mV Vmax-Vmin.

Engineers use this probe for signal integrity verification, system performance optimization, and combined hardware-firmware development workflows.

Technical Specifications

• Channels: 34


• Probe Series: Soft Touch Pro Series


• Probe Type: Connectorless, direct-connect


• Connector: 160-pin direct connect


• Data Signal Type: Single-ended


• Clock Signal Type: Single-ended or differential


• Amplitude Range: 200 mV Vmax-Vmin

Key Features

• Direct-connection design minimizes impedance and preserves signal fidelity on the target system


• Low-impact probing reduces loading effects during measurement


• Supports simultaneous single-ended data and differential clock acquisition


• Compatible with E5405-68702 retention modules for flexible deployment

Typical Applications

• Embedded system debug and verification


• Digital signal path analysis


• Multi-channel logic capture during firmware development


• Signal integrity assessment in high-speed designs

Compatibility & Integration

• Keysight 16850A Series portable logic analyzers


• E5405-68702 retention module (individual)


• E5403A retention module kit (five units)


• Detailed electrical characteristics and transmission behavior documented in the U4200A-Series Probes and Cables User Guide