NI SCXI-1100

Description

Product Parameters and Specifications

The SCXI-1100 is engineered with precise technical specifications for demanding measurement applications:

• Manufacturer: National Instruments (NI)

• Series: SCXI (Signal Conditioning eXtensions for Instrumentation)

• Part Number: NI SCXI-1100

• Product Type: Voltage Input Module / Signal Conditioning Module

• Input Channels:

  • 32 differential analog input channels

  • 64 single-ended analog input channels (configurable)

• Input Configuration: Software-selectable differential or single-ended per channel

• Input Voltage Ranges: Software-selectable ranges including:

  • ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V, ±0.15625 V, ±0.078125 V

  • ±100 mV, ±50 mV, ±25 mV, ±12.5 mV

• Amplification: Programmable gain instrumentation amplifier on each channel

• Gain Settings: Software-selectable gains of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000

• Bandwidth: 22 kHz (typical at gain 100)

• Accuracy: ±0.03% of reading ±0.01% of range (typical, gain 1-100)

• Input Impedance: 20 GΩ (typical)

• Common-Mode Rejection Ratio (CMRR): 100 dB minimum (DC to 60 Hz)

• Noise: 6 µVrms typical (gain 100, 0.1 Hz to 10 Hz)

• Multiplexing: Onboard scanning capability for sequential channel sampling

• Scan Rate: Up to 333 kS/s aggregate (with appropriate DAQ hardware)

• Backplane Interface: SCXI backplane connector for communication with DAQ module

• Front Connector: 96-pin male DIN connector for field wiring

• Operating Temperature: 0°C to 55°C (32°F to 131°F)

• Storage Temperature: -20°C to 70°C (-4°F to 158°F)

• Humidity: 10% to 90% non-condensing

• Dimensions: Standard SCXI module size (approximately 6.9″ x 1.2″ x 8.0″)

Advantages and Features

The NI SCXI-1100 offers a comprehensive set of features that make it a preferred solution for multi-channel voltage measurements:

• High Channel Density: With 32 differential or 64 single-ended channels in a single slot, the SCXI-1100 maximizes measurement capacity within the SCXI chassis, enabling compact, high-channel-count systems ideal for applications with space constraints.

• Programmable Gain Amplification: The onboard instrumentation amplifier with software-selectable gains from 1 to 2000 allows the NI SCXI-1100 to accommodate signals from millivolt-level sensors to ±10V industrial signals without external signal conditioning, simplifying system design and reducing component count.

• Flexible Input Configuration: Software-selectable differential or single-ended operation per channel provides versatility for different sensor types and wiring configurations. Differential inputs reject common-mode noise for improved accuracy with remote sensors, while single-ended mode maximizes channel count for local measurements.

• High Accuracy and Low Noise: Precision components and careful circuit design deliver exceptional measurement accuracy with low noise performance, ensuring reliable data even for low-level signals. The SCXI-1100 maintains accuracy across temperature variations, critical for long-term monitoring applications.

• Automatic Channel Scanning: Onboard scanning capability enables sequential sampling of multiple channels without host processor intervention, reducing software overhead and enabling deterministic sampling rates essential for dynamic measurements.

• Seamless DAQ Integration: The NI SCXI-1100 interfaces directly with NI DAQ devices through the SCXI backplane, appearing as a simple channel expansion to the DAQ hardware. This integration simplifies programming and ensures compatibility with NI’s extensive software ecosystem including LabVIEW, LabWindows/CVI, and Measurement Studio.

• Industrial-Grade Construction: Built with high-quality components and robust construction, the SCXI-1100 withstands the demands of industrial environments while maintaining long-term reliability. Gold-plated connectors resist corrosion and ensure reliable connections over years of service.

• Hot-Swappable Capability: The module can be inserted or removed from an energized SCXI chassis without powering down the system, facilitating maintenance and system reconfiguration without interrupting operations on other modules.

Application Fields and Cases

The NI SCXI-1100 is deployed across numerous industries requiring precision multi-channel voltage measurements:

• Research Laboratories: Used extensively in university and corporate research facilities for experiments requiring numerous simultaneous measurements. For example, materials science researchers use the SCXI-1100 to monitor strain gauges, thermocouples, and position sensors during mechanical testing, with the programmable gain accommodating various sensor types without external amplifiers.

• Automotive Testing: Applied in vehicle test cells, engine dynamometers, and durability testing where dozens of sensors monitor performance parameters. The NI SCXI-1100 enables simultaneous acquisition of temperature, pressure, vibration, and position signals, providing comprehensive data for vehicle development and validation.

• Aerospace and Defense: Employed in structural test laboratories for airframe fatigue testing, where hundreds of strain gauges require continuous monitoring. Multiple SCXI-1100 modules in a single chassis provide the channel density needed for these large-scale tests while maintaining the accuracy required for critical safety assessments.

• Industrial Machine Monitoring: Used in manufacturing facilities to monitor vibration, temperature, and electrical parameters on critical machinery. The NI SCXI-1100 provides the channel count and signal conditioning needed for comprehensive machine health monitoring, enabling predictive maintenance strategies that reduce unplanned downtime.

• Power Generation and Utility Applications: Applied in power plant performance testing and transformer monitoring where numerous analog signals require simultaneous measurement. The SCXI-1100 provides reliable signal conditioning in electrically noisy environments, ensuring accurate data for efficiency calculations and condition assessment.

Comparison with Competing Products

When evaluated against alternative multi-channel voltage measurement solutions, the NI SCXI-1100 demonstrates distinct advantages:

• vs. Keysight 34970A/34972A Data Acquisition Units: Keysight’s DAQ units offer integrated switching and measurement but typically provide fewer channels per slot and require external signal conditioning for low-level signals. The SCXI-1100 offers higher channel density and integrated programmable gain amplification, eliminating the need for external signal conditioning for most sensor types. Additionally, the SCXI platform’s modular architecture allows easier expansion and reconfiguration than fixed-size DAQ units.

• vs. Measurement Computing USB-2416: USB-based DAQ devices offer simplicity but limited channel counts and fixed input ranges. The NI SCXI-1100 provides superior channel density, programmable gain for each channel, and better noise performance, making it更适合 for applications requiring both high channel count and measurement precision. The SCXI platform also supports synchronized operation across multiple modules, while USB devices often have synchronization limitations.

• vs. ADwin Gold II Systems: ADwin offers high-speed data acquisition but at significantly higher cost. The SCXI-1100 provides an excellent balance of performance and value for applications requiring moderate scanning rates (up to 333 kS/s) and high channel counts. For users already invested in the NI ecosystem, the NI SCXI-1100 offers seamless integration with existing software and hardware investments.

Selection Suggestions and Precautions

When considering the NI SCXI-1100 for your application, keep these critical factors in mind:

• Chassis Compatibility: The SCXI-1100 requires a compatible SCXI chassis (such as SCXI-1000, SCXI-1001) with appropriate power supply and backplane capabilities. Verify that your chassis has available slots and sufficient power capacity for all installed modules before adding a NI SCXI-1100.

• DAQ Hardware Requirements: The SCXI-1100 requires a compatible DAQ module (such as NI 6052E, NI 6070E, or newer X Series devices) installed in the same chassis or connected via cable to an external DAQ device. Ensure your DAQ hardware supports the channel count and scanning rates required for your application.

• Terminal Block Selection: Field wiring requires a compatible terminal block such as the SCXI-1300 (screw terminal) or SCXI-1320 (high-accuracy) for connecting sensors to the NI SCXI-1100. Choose the appropriate terminal block based on your wiring requirements and desired accuracy.

• Gain Setting Optimization: Select gain settings appropriate for your expected signal levels to maximize resolution while avoiding saturation. The SCXI-1100 provides software-selectable gains, but optimal performance requires careful matching of gain to signal range for each channel.

• Noise Reduction Techniques: For low-level measurements, employ proper shielding, twisted-pair wiring, and differential connections to minimize noise pickup. The NI SCXI-1100 provides excellent CMRR, but system noise performance depends heavily on proper installation practices.

• Scan Rate Considerations: The maximum aggregate scan rate of 333 kS/s is shared across all active channels. Calculate required per-channel rates and ensure total sampling requirements do not exceed the SCXI-1100 capabilities when used with your specific DAQ hardware.

• Calibration Requirements: For precision measurements, verify calibration status of the SCXI-1100 and schedule periodic recalibration according to your quality system requirements. NI offers calibration services and procedures for maintaining measurement accuracy.

• Software Compatibility: Ensure your development environment (LabVIEW, LabWindows/CVI, C++, Python, etc.) has appropriate drivers for the SCXI-1100. NI-DAQmx provides comprehensive support, but verify compatibility with your specific software version and operating system.

• Source from Reputable Suppliers: Given the precision requirements of measurement applications and the potential for counterfeit or improperly tested modules, sourcing from a trusted vendor like AxControl is essential. They can provide verified, tested NI SCXI-1100 units with appropriate warranties and technical support to ensure reliable operation in your application.

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