Description
Product Introduction
The National Instruments cDAQ-9174 is a four-slot CompactDAQ USB chassis designed for modular, small-channel data acquisition systems. Built around a rugged aluminum enclosure, it integrates timing, synchronization, and power routing for National Instruments C Series I/O modules. It sees heavy deployment in portable test benches, automotive validation rigs, and benchtop laboratory measurements.
To be honest, the real value here is flexibility. Unlike monolithic data loggers, this chassis lets you mix and match thermocouple, voltage, digital, and IEPE accelerometer modules on the same backplane. It uses NI’s traditional USB 2.0 streaming architecture, making it a reliable workhorse when you need deterministic timing without messing with complex network switches or PXI subracks.
Key Technical Specifications
| Parameter | Value |
| Number of Slots | 4 C Series I/O slots |
| Bus Interface | USB 2.0 (High-Speed) |
| Maximum Sample Rate | Dependent on installed C Series modules |
| Timing/Trigger Cores | 4 counter/timers (32-bit) |
| Power Supply Input | 9 VDC to 30 VDC |
| Power Consumption | 10 W max (operational with modules) |
| Operating Temperature | -40^\circC to 70^\circC |
| Shock and Vibration | 30 g peak, half-sine (operating) |
| Enclosure Material | Die-cast aluminum alloy |
| Dimensions | 25.4 \times 8.8 \times 10.2 cm (10.0 \times 3.5 \times 4.0 in) |
| Weight | 965 g (34.0 oz) |
Application Scenarios & The “Trench” Experience
Picture this: It is 11 PM on a Friday. Your team is running a final thermal endurance test on a prototype gearbox, and suddenly the legacy data acquisition interface drops offline with a bus timeout error. The old PCI card in your desktop workstation fried its slot. You cannot afford to halt testing over the weekend. You pull a spare cDAQ-9174 off the shelf, snap in your existing thermocouple and strain gauge modules, plug in the USB cable, and DAQmx recognizes the tree instantly. Test resumed. Crisis averted.
- Automotive – Component Durability Testing: Used in mobile test vans to log vibration and strain data from suspension linkages using dynamic bridge modules.
- Aerospace – Wind Tunnel Instrumentation: Deployed locally near wind tunnel test articles to reduce analog cable run lengths and minimize noise pickup.
- Manufacturing – End-of-Line Quality Test Stands: Integrates pressure, current, and digital I/O modules to run rapid, automated pass/fail checks on sub-assemblies.
- Energy – Turbine Vibration Monitoring: Collects high-frequency accelerometer data for temporary diagnostic field audits.
cDAQ-9174
cDAQ-9174
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual NI racks. Every cDAQ-9174 that enters our inventory undergoes a rigorous evaluation process:
- Inbound Inspection: Visual check for anti-tamper seals, board corrosion, and connector pin integrity.
- Live Rig Testing: Powered up on a dedicated bench using NI Measurement & Automation Explorer (MAX) to verify USB handshake and device self-test routines.
- Electrical Parameter Checks: Verification of internal power rail voltages and isolation barrier resistance.
- Firmware Verification: Checking and logging the onboard microcontroller and timing controller firmware revisions.
- Final QC & Anti-static Packaging: Sealed in humidity-controlled, static-shielding bags with protective port covers.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ USB Cable Lock: Do not use standard, unbranded USB cables. The cDAQ-9174 relies on a thumbscrew locking mechanism on the chassis side. If you use a generic cable without physical strain relief, plant vibration will cause intermittent USB disconnects mid-test. Use the OEM locking cable.
❗ DAQmx Driver Mismatch: Verify your NI-DAQmx version before plugging this into an older engineering workstation. If your software suite is too old, it won’t recognize the device enumeration, forcing an emergency driver update in the middle of a commissioning window.
⚠️ Module Power Budget: Remember that the chassis supplies limited power to the modules. If you load up all four slots with high-draw specialty modules, calculate the total power consumption carefully or use an external auxiliary power supply to avoid dropped frames.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the cDAQ-9174 hot-swappable?
A: Yes, you can hot-swap C Series I/O modules while the chassis is powered on and connected via USB, provided your DAQmx application handles dynamic device addition/removal correctly.
Q: Can I use this chassis with NI LabVIEW and Python?
A: Absolutely. It runs on the standard NI-DAQmx driver stack. You can write your acquisition scripts in LabVIEW, C++, C#, or use the NI-DAQmx Python API.
Q: Why is this unit priced lower than ordering direct from National Instruments?
A: We source surplus and excess inventory from industrial liquidations, factory cancellations, and plant upgrades. These are genuine, factory-original hardware units available off-the-shelf without long factory lead times.
Q: What warranty is included?
A: Every unit comes with our standard 12-month replacement warranty. If it fails due to hardware defects under normal operating conditions, we swap it out.
Q: Does this unit include the power supply and USB cable?
A: It ships with the chassis and screw terminal power connector. Industrial locking USB cables and desktop power supplies can be added upon request—just check with our sales desk.
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