CompactDAQ

CompactDAQ
Name	CompactDAQ
Developer	National Instruments
Type	Data acquisition system
Release	2009
Operating system	Windows, NI Linux Real-Time
Connectivity	USB, Ethernet
Modules	C series I/O modules
Website	National Instruments

CompactDAQ is a modular data acquisition platform designed for signal measurement, control, and test systems, developed by National Instruments. It integrates chassis-based hardware, swappable input/output modules, and software drivers to address industrial, laboratory, and field measurement tasks across diverse engineering and scientific projects. CompactDAQ is often deployed alongside measurement instruments and automation frameworks from vendors, research institutions, and test laboratories.

Overview

CompactDAQ originated as part of National Instruments' product lineage alongside PXI and NI DAQ; it emphasizes portability and modularity suitable for bench-top and portable test environments. Typical customers include companies in automotive, aerospace, manufacturing, and energy sectors, as well as universities and national laboratories. CompactDAQ chassis house C Series modules that interface with sensors such as strain gauges, thermocouples, accelerometers, and analog voltage sources; the platform interoperates with software ecosystems like NI LabVIEW, NI-DAQmx, and TestStand. Competing products and adjacent platforms include PXI systems, LXI instruments, and DAQ devices from vendors such as Keysight, Tektronix, and Data Translation.

Hardware Architecture

The CompactDAQ architecture centers on a rugged chassis that provides power, timing, and communication backplane to C Series modules. Chassis variants offer USB and Ethernet connectivity for host communication; internal components include a timing bus, trigger lines, and a local processor in some Ethernet-enabled models. The C Series module form factor supports mixed-signal integration with isolation options and integrated signal conditioning. Mechanical and electrical designs reflect standards used by instrumentation manufacturers and are influenced by modular frameworks employed by the instrumentation industry and test labs worldwide.

Modules and Accessories

C Series modules span categories: analog input, analog output, digital input/output, counter/timer, and specialized sensors for strain, IEPE, RTD, and thermocouple measurements. Accessory components include terminal blocks, wiring harnesses, shrouds, and ruggedized enclosures for field deployment. Third-party vendors supply breakout boxes, signal conditioners, and custom front panels compatible with the C Series mechanical footprint. Popular complementary products and standards referenced by system integrators include IEEE timing standards, DIN-rail mounting hardware used by control system integrators, and connector systems from Amphenol and TE Connectivity.

Software and Programming

CompactDAQ integrates with NI-DAQmx drivers and LabVIEW graphical programming, supporting C, C++, Python, and .NET through vendor-provided APIs. Typical development workflows use LabVIEW for rapid prototyping, LabWindows/CVI for C-based applications, and Python bindings for scripts and automation in research labs. Test management and sequencing often employ TestStand or continuous integration tools used by engineering teams in industrial testing. Developers leverage timing and synchronization APIs to implement triggered acquisition, multi-device synchronization, and deterministic logging when paired with real-time operating environments used by instrumentation teams.

Applications and Use Cases

CompactDAQ is used in structural test rigs at aerospace suppliers, vibration and modal testing in automotive R&D centers, environmental chamber monitoring at materials laboratories, and process monitoring in power plants. Research groups at universities use CompactDAQ for biomechanics experiments, geotechnical sensor networks, and oceanographic instrumentation when portability and modular I/O are required. Field deployment scenarios include on-site vibration diagnostics at manufacturing facilities and portable emissions testing for regulatory compliance programs. System integrators combine CompactDAQ with actuators and controllers from control equipment manufacturers to implement closed-loop test stands and validation benches.

Performance and Specifications

Performance depends on chosen chassis and modules: analog input modules offer input ranges from microvolts to tens of volts, resolutions from 12-bit to 24-bit, and sampling rates from single samples per second to several hundred kilohertz per channel on high-speed modules. Digital I/O modules provide TTL, CMOS, and opto-isolated interfaces for interoperability with industrial control hardware. Counter/timer modules support quadrature encoders and pulse-width measurements used by motion control vendors. Specifications such as common-mode rejection ratio, input impedance, accuracy, and drift are documented in module datasheets and are comparable to requirements set by metrology labs and certification bodies.

Comparison with Other DAQ Systems

Compared with PXI systems favored in automated test equipment racks, CompactDAQ emphasizes portability and lower cost, while PXI offers tighter synchronization and higher chassis slot counts used by aerospace test programs. LXI instruments provide instruments-on-Ethernet for distributed test architectures in standards-driven test environments, whereas CompactDAQ focuses on modular I/O for sensor-dense applications encountered by manufacturing test engineers. USB-based DAQ devices from other vendors trade off channel density and industrial robustness relative to CompactDAQ chassis used by field service teams. System integrators weigh factors such as native software integration, form factor, and third-party accessory ecosystems when selecting between CompactDAQ, PXI, LXI, and vendor-specific DAQ products.

National Instruments LabVIEW NI-DAQmx TestStand LabWindows/CVI Python (programming language) C (programming language) C++ .NET Framework IEEE PXI LXI Keysight Technologies Tektronix Data Translation Amphenol TE Connectivity Aerospace industry Automotive industry Manufacturing Energy industry University of Cambridge Massachusetts Institute of Technology Stanford University National Laboratories Metrology Calibration Environmental testing Vibration testing Modal analysis Strain gauge Thermocouple RTD IEPE Accelerometer Encoder Quadrature encoder DIN rail Ruggedized enclosure Signal conditioning Terminal block Wiring harness Continuous integration Automation Process monitoring Power plant Emissions testing Structural testing Biomechanics Geotechnical engineering Oceanography Field service System integrator Instrumentation Test equipment Calibration laboratory Control system Actuator Controller Motion control Quadrature Sampling rate Resolution (computing) Input impedance Common-mode rejection ratio Signal-to-noise ratio Drift (metrology) National Instruments (company) USB Ethernet Real-time operating system NI Linux Real-Time Shroud (hardware) Breakout box Front panel Connector TE Connectivity (company) Amphenol Corporation Keysight Tektronix (company) Data acquisition Test bench Bench-top instrument Portable instrument Rugged hardware Sensor network Power measurement Temperature measurement Pressure sensor Displacement sensor Force sensor Torque sensor

Category:Data acquisition systems