The Keysight DAQM904A is a 4×8 two-wire matrix switch module for the DAQ970A and DAQ973A data acquisition systems. It provides 32 two-wire crosspoints rated to 300 Vrms and 1 A, supporting signal routing across automated test and data logging applications. Rows and columns can be cascaded between multiple modules to build larger matrices—up to 8×8, 4×16, or configurations reaching 96 crosspoints per mainframe. This architecture enables concurrent multi-instrument interfacing with multiple points on a device under test.
Technical Specifications
• Crosspoints: 32 two-wire per module
• Switching Voltage: Up to 300 Vrms
• Switching Current: Up to 1 A
• Maximum Bandwidth: 10 MHz
• Scan Rate: Up to 120 channels/sec (with DAQ970A/DAQ973A mainframe)
• Transient Voltage Limit: 1500 Vpk referenced to earth
• Measurement Category: CAT ‘Others’ (not for direct mains connection)
– Key Features
• Modular two-wire matrix design for flexible signal path configuration
• Expandable architecture supports 8×8, 4×16, and larger matrix configurations
• Up to 96 crosspoints achievable within a single mainframe using multiple modules
• 10 MHz bandwidth suitable for AC and transient measurements
• High scan rate minimizes test cycle time in high-channel-count systems
– Typical Applications
• Automated test equipment (ATE) requiring multi-point device connectivity
• Data logging and telemetry signal acquisition and routing
• Manufacturing test where parallel instrument access to multiple DUT nodes is required
• Environmental and reliability testing with centralized switching infrastructure
– Compatibility & Integration
The DAQM904A plugs directly into Keysight DAQ970A and DAQ973A mainframes alongside other compatible DAQ modules. Matrix expansion is achieved by connecting row or column terminals between adjacent DAQM904A modules within the same mainframe. Full SCPI programming support is provided through the DAQ970A/DAQ973A system controller.
