The National Instruments NI 9171 is a single slot USB CompactDAQ chassis and module carrier for C Series modules. It provides a compact platform for connecting one measurement module to a host computer over USB. The chassis is used in portable measurement, bench testing, educational laboratories, and focused data acquisition systems.
A module carrier holds and connects a C Series module to the system. The NI 9171 combines this carrier function with USB communication. Engineers can select the module that matches the measurement task and use the chassis as a dedicated acquisition interface.
Single Slot Carrier Architecture
The NI 9171 supports one C Series module. This single slot design keeps the system small and focused. Engineers can use a voltage, temperature, current, digital, or counter module depending on the requirement.
The carrier format simplifies module changes when test requirements vary. A module can be replaced without changing the host computer or software framework.
USB Connectivity
The chassis uses USB to communicate with a host computer. USB connectivity simplifies installation because many computers provide USB ports and standard drivers. Engineers should verify host USB capability and power requirements.
Proper cable management and strain relief help maintain reliable communication. For portable systems, the chassis can be placed near the sensors while the computer remains at a convenient location.
C Series Module Compatibility
The NI 9171 works with compatible C Series modules. Module selection should consider signal range, isolation, resolution, sampling rate, and connector type.
The module defines the measurement performance, while the chassis provides the USB and mechanical interface. This separation supports platform reuse and simplified spares planning.
Software and System Integration
The chassis is designed to work with NI data acquisition software and standard programming environments. Engineers can configure channels, acquire data, log results, and build user interfaces.
The chassis appears as part of the measurement system in software. Applications can run on a laptop or desktop computer and access the module through USB.
Applications
The NI 9171 is suitable for benchtop validation, sensor characterization, educational experiments, and portable diagnostics. In a laboratory, it can support focused measurements with one module.
Installation and Maintenance
Installation requires connecting the chassis to a compatible C Series module, attaching the USB cable, and verifying software recognition. The chassis should be placed in a location that avoids excessive heat, moisture, and mechanical stress.
Maintenance includes checking USB connections, inspecting module seating, and confirming software configuration. Documentation of module type and channel configuration helps maintain repeatability.
Summary
The National Instruments NI 9171 USB cDAQ Chassis provides a single slot carrier and USB interface for C Series modules. It supports compact and focused data acquisition, module flexibility, and simple software integration. The NI 9171 is a practical chassis for portable and bench measurement applications.
