DAQ Modules & Cards

DAQ modules and cards are the plug-in measurement and switching components that define the specific capabilities of modular data acquisition and switching systems. These modules install into DAQ mainframes and switching platforms, providing targeted functions including multiplexing, relay switching, analog output, digital I/O, counter/timer operations, and specialized sensor interfaces for thermocouples, RTDs, and strain gauges. By selecting appropriate module combinations, engineers can assemble tailored multi-channel measurement solutions for a wide variety of test and measurement tasks within a single chassis, avoiding the cost and complexity of multiple standalone instruments.

Keysight's 34900-series modules, designed for the 34970A, 34972A, and 34980A platforms, represent one of the most widely deployed DAQ module families in the industry. The lineup spans 20- and 40-channel armature and reed relay multiplexers, actuator and general-purpose switch modules, multifunction I/O boards with analog output, counter/timer, and digital I/O, as well as high-density 40-channel analog input modules. Module selection is driven by signal type, channel count, required switching speed, isolation voltage, and relay lifetime requirements.

Typical Applications

High-channel-count voltage and temperature scanning in thermal characterization and burn-in testing
Relay-based signal routing in automated functional test and parametric measurement systems
Digital I/O and pulse counting for process control integration and event monitoring
Analog stimulus output for closed-loop stimulus-response test setups
Four-wire resistance measurement across multiple device under test (DUT) channels in production testing

Popular Brands

Keysight offers the most comprehensive DAQ module ecosystem, with 34900-series cards covering multiplexers, actuators, and multifunction I/O for the 34970A and 34980A platforms. National Instruments (NI) provides a broad range of PXI and CompactDAQ modules supporting high-speed analog input, digital I/O, and counter functions. Keithley supplies switch cards compatible with its 700-series scanner mainframes for precision low-level measurement applications.