The Keysight/Agilent/HP 44421A is a 20-channel relay multiplexer that expands signal routing capabilities in automated test systems. Designed to integrate with the 3497A Data Acquisition System, it delivers precise channel switching through reed relays with low thermal offset characteristics. Each of the 20 channels includes High, Low, and Guard lines for flexible signal conditioning. Channels are organized into two groups of ten, with the ability to close one channel per group independently. The architecture supports sequential and random channel closure between programmable limits, making it ideal for high-throughput test automation. Guard lines and dual-channel capability per decade enable four-terminal resistance measurements. Low thermal offset relays ensure accuracy in precision low-level applications including transducer and temperature sensor measurements.
Technical Specifications
• Channels: 20 total (organized as two groups of 10)
• Relay Type: Reed relays with low thermal offset
• Channel Configuration: Each channel: High, Low, and Guard lines
• Switching Capability: One channel closable per decade; supports random and sequential closure
• Four-Terminal Measurements: Supported via dual-channel closure per decade
• DC Isolation: Greater than 10 GΩ (channel-to-channel, channel-to-earth)
• Offset Voltage: Less than 3 µV
• Closed Channel Resistance: Typically < 1.5 Ω
– Key Features
• Independent channel selection within each 10-channel group
• Guard line implementation for enhanced signal integrity
• Low thermal offset for precision low-level measurements
• Reed relay technology for reliable, repeatable switching
• Programmable channel sequence and random access modes
– Typical Applications
• Multi-channel data acquisition and signal routing
• Transducer and temperature sensor measurement systems
• Automated test sequences requiring variable channel selection
• Four-terminal resistance measurements
• Low-level signal measurement and conditioning
– Compatibility & Integration
Primarily designed for integration with the Keysight/Agilent/HP 3497A Data Acquisition System. The modular design facilitates expansion of measurement capacity in existing test configurations.
