The HP/Agilent 34933A is a dual/quad 4×8 reed matrix module purpose-built for the 34980A Multifunction Switch/Measure Unit. It delivers flexible signal routing across up to 64 2-wire cross-points or 128 1-wire cross-points, with switching speeds of 500 channels/second and 30 MHz bandwidth. The module supports dual 2-wire or quad 1-wire configurations, scalable to larger matrices via analog bus expansion. High-speed reed relays maintain thermal offset under 50 µV, critical for precision measurement systems. Integrated 100 Ω in-rush resistors protect against reactive load damage; bypass capability exists for applications sensitive to series resistance. Maximum simultaneous channel closure reaches 20 (2-wire) or 40 (1-wire) channels, governed by power dissipation limits. The module includes an integrated relay counter and safety interlock, plus direct internal DMM connections for voltage and resistance measurement on designated channels.
Technical Specifications
• Module Type: Dual/Quad 4×8 Reed Matrix
• Switching Speed: 500 channels/second
• Bandwidth: 30 MHz
• Thermal Offset: <50 µV
• Maximum Switching Voltage: ±150 V peak
• Maximum Switching Current: 0.5 A
• Maximum Carrying Current: 1.5 A
• In-rush Resistors: 100 Ω per column (bypassable)
• 2-Wire Cross-points: 64 (dual 4×8 configuration)
• 1-Wire Cross-points: 128 (quad 4×8 configuration)
• Simultaneous Channel Closure: 20 channels (2-wire), 40 channels (1-wire)
• Analog Buses: Four 2-wire buses for matrix expansion
• Safety Interlock: Integrated
• Relay Counter: Integrated tracking
– Key Features
• Configurable 2-wire differential or 1-wire single-ended operation
• Expandable to 1024 1-wire cross-points in single mainframe with multiple modules
• Internal DMM connections for direct voltage and resistance measurement
• Bypass-capable in-rush resistors for reduced series impedance
• Low thermal offset ensures measurement repeatability in precision applications
– Compatibility & Integration
Designed for integration with the Agilent/Keysight 34980A Multifunction Switch/Measure Unit. Cascadable via analog buses for larger switching matrices.
