The NI cDAQ-9174 is a portable, 4-slot CompactDAQ chassis designed for small-to-medium channel count data acquisition systems. Utilizing a high-speed USB 2.0 interface, it provides a flexible, modular platform to measure electrical, physical, mechanical, or acoustic signals right at your desktop or out in the field. By decoupling the timing engine from individual modules, it allows engineers to combine completely different measurement types into a single, synchronized measurement frame.
1. Key Technical Specifications
| Feature | Specification |
| Number of Slots | 4 (For NI C Series modules) |
| Bus Interface | USB 2.0 Hi-Speed |
| Timing Controller | NI-ST3 |
| Onboard Counters | 4 general-purpose 32-bit counters |
| Concurrent Tasks | Up to 7 hardware-timed tasks (AI, AO, DI, DO, counters) |
| Input Voltage Range | 9 VDC to 30 VDC |
| Power Consumption | 15 W maximum |
2. Detailed Technical Breakdown
Advanced NI-ST3 Timing Engine
The core processing power of the cDAQ-9174 comes from its integrated NI-ST3 timing controller. Unlike basic USB data acquisition devices that force all channels to sample at the exact same rate, the cDAQ-9174 can run up to 7 independent hardware-timed tasks concurrently. This means you can log high-speed structural vibrations at 50 kS/s on one module while slowly logging ambient temperatures at 1 S/s on an adjacent module, all without software cross-talk or timing conflicts.
Plug-and-Play USB Simplplicity
The chassis connects directly to any desktop PC or laptop using a standard USB cable, completely eliminating the need for specialized internal PCIe cards or network configuration arrays. It includes an integrated USB cable strain-relief mechanism to prevent accidental disconnects during active testing. Once plugged in, the device is immediately recognized by the NI-DAQmx driver framework, allowing for swift setup inside LabVIEW, Python, or C/.NET.
Rugged Industrial Enclosure
Despite its clean benchtop appearance, the cDAQ-9174 features a rugged A380 aluminum die-cast design. It can tolerate operational shocks up to 30 g and continuous operational vibrations up to 5 g. This makes it highly dependable when deployed inside vehicle test bays, factory automation control panels, or outdoor environmental testing kits.
3. Usage and Application Scenarios
Mixed-Signal Benchtop Testing
Perfect for laboratory validation benches where engineers need to evaluate a prototype device. In a single 4-slot footprint, you can combine an analog input module for voltage monitoring, a thermocouple module for temperature profiling, and a digital I/O module for sending control commands.
Portable NVH (Noise, Vibration, and Harshness) Analysis
Automotive and mechanical engineers frequently use the cDAQ-9174 for mobile diagnostics. Populating the slots with sound and vibration modules (such as the NI-9234) turns the chassis into a portable analyzer for measuring accelerometers and microphones inside a moving vehicle or aircraft.
Academic Engineering Labs
The combination of a 4-slot capacity, USB simplicity, and low relative cost makes it an ideal instructional baseline for university research facilities looking to teach multi-sensor data acquisition concepts.
4. Product Comparison and Recommendations
NI cDAQ-9174 (The Balanced USB Choice): 4 slots, USB powered via external supply. Best for portable systems requiring a few distinct measurement types.
NI cDAQ-9171 (The Ultra-Portable Single): 1 slot, USB bus-powered. Best for single-module tasks where external power is unavailable.
NI cDAQ-9178 (The High-Density USB Standard): 8 slots, USB. Features dual onboard BNC connections for external triggering and hardware synchronization. Choose this if you expect your sensor count to scale beyond 4 modules.
NI cDAQ-9185 (The Networked Alternative): 4 slots, Ethernet with TSN (Time-Sensitive Networking). Choose this if your chassis must be deployed over 5 meters away from the PC or synchronized over a local network.
Summary
The NI cDAQ-9174 is an exceptionally versatile, compact infrastructure foundation for modular data acquisition. By bridging the gap between ultra-portable single-slot units and large 8-slot frames, it provides exactly enough headroom for most everyday engineering verification challenges. We offer dedicated technical support for NI-DAQmx module scaling and support for project pricing on multi-bench lab setups and system integrations.
