Keysight / Agilent / HP 34904A 4×8 Two-Wire Matrix Switch

The Keysight 34904A is a 4×8 two-wire matrix switch module that routes signals between a device under test and multiple test instruments within automated test systems. It delivers 32 crosspoints and integrates directly into the 34970A and 34972A Data Acquisition/Switch Units. The module supports voltage switching up to 300 V and current up to 1 A, with signal bandwidth extending to 10 MHz. Multiple 34904A modules can be combined to build larger matrix configurations—8×8, 4×16, and beyond—enabling up to 96 crosspoints within a single mainframe.

– Technical Specifications

• Matrix configuration: 4×8 two-wire
• Crosspoints: 32
• Maximum switching voltage: 300 V
• Maximum switching current: 1 A
• Bandwidth: 10 MHz
• Capacitance: 50 pF
• Input offset voltage: 3 µV
• Sampling rate: 120 sps

– Key Features

• Handles DC and AC signals up to 10 MHz bandwidth
• Low input offset voltage (3 µV) minimizes measurement error in low-level switching applications
• Modular design allows row and column interconnection across multiple units for custom matrix expansion
• Rated for both high-voltage (300 V) and standard signal-level routing in the same module

– Typical Applications

• Multi-point switching in device characterization and parametric testing
• Signal routing for concurrent multi-instrument measurement setups
• Complex test sequences requiring dynamic path reconfiguration
• Low-level analog signal acquisition with minimal crosstalk

– Compatibility & Integration

The 34904A plugs into Keysight 34970A and 34972A mainframes. Each chassis accommodates multiple modules, enabling custom test system architectures. Row and column connections between adjacent modules extend the switching matrix beyond single-module limits.