Agilent/Keysight DAQM902A

The Keysight DAQM902A is a 16-channel differential multiplexer module engineered for integration into Keysight DAQ970A and DAQ973A data acquisition mainframes. Built on reed relay switching technology, it delivers scanning rates up to 250 channels per second, enabling rapid automated testing, high-speed data logging, and continuous monitoring operations. The module supports both two-wire and four-wire measurement configurations with the ability to mix channel types on a single card, providing measurement flexibility without requiring separate modules.

Technical Specifications

• 16-channel differential multiplexer with reed relay switching


• Maximum scan rate: 250 channels/second


• Maximum voltage switching: 300 V


• Maximum current: 50 mA


• Closed channel resistance (2-wire, typical): 10 GΩ


• Channel-to-earth isolation: > 10 GΩ


• Power rating: 2 W

Key Features

• Supports 2-wire and 4-wire scanning configurations on the same module


• High-speed reed relay switching for rapid channel scanning


• Built-in thermocouple reference junction for temperature measurement applications


• Current measurement capability via user-provided shunt resistors


• Low closed-channel resistance minimizes measurement errors


• Excellent channel isolation for signal integrity in multi-channel environments

Typical Applications Automated test systems requiring high-speed multiplexing, industrial data acquisition networks, temperature monitoring with thermocouple inputs, multi-channel voltage and resistance measurements, and laboratory test benches performing simultaneous measurements across numerous signal sources.

Compatibility & Integration The DAQM902A integrates directly into Keysight DAQ970A and DAQ973A mainframe units via modular slot architecture. Physical connector specifications and detailed integration guidance are found in the respective mainframe documentation.