TBX-68T National Instruments

TBX-68T National Instruments Analog Input Module

Product  Description：

National Instruments (NI) Analog Input Modules, prominently featured within the C Series, PXI, and SCXI hardware families, are high-performance data acquisition (DAQ) components designed to measure continuous physical phenomena. These modules capture continuous electrical signals—such as voltage, current, and resistance—from various sensors and convert them into precise digital data. Engineered for both laboratory research and rugged industrial deployment, NI analog input modules integrate advanced synchronization, filtering, and amplification technologies to deliver industry-leading measurement fidelity.

Product Parameters

The technical profile of an NI Analog Input Module centers on measurement resolution, sampling speed, and signal conditioning capabilities:

• Sampling Rate: Supports a broad spectrum of speeds, ranging from highly accurate low-speed modules at 10 samples per second to ultra-high-speed transient recorders running at tens of millions of samples per second (MS/s) per channel.

• Analog-to-Digital Converter Resolution: Utilizes high-precision architectures featuring 12-bit, 16-bit, or advanced 24-bit delta-sigma converters to capture extremely minute voltage fluctuations.

• Input Signal Voltage Ranges: Offers flexible software-selectable input ranges, commonly supporting standard spans such as ±10V, ±5V, ±1V, and down to millivolt levels (±200mV) for direct sensor connection.

• Channel Architecture: Available in various configurations, including high-density 32-channel single-ended configurations or highly accurate 4-channel to 16-channel fully differential designs.

• Isolation Ratings: Incorporates robust safety barriers, often rated up to 250V AC/DC continuous channel-to-earth or channel-to-channel isolation to prevent damage from high-voltage transients.

• Integrated Sensor Conditioning: Select modules include built-in excitation currents for Resistance Temperature Detectors (RTDs), bridge completion for strain gages, and IEPE power for accelerometers.

Product Advantages

NI analog input modules are favored in test, measurement, and validation applications due to their exceptional flexibility and data accuracy:

• Direct Sensor Connectivity: Many NI modules eliminate the need for external signal conditioning hardware by incorporating specialized amplification, filtering, and sensor power directly onto the card, saving space and cost.

• Nanosecond-Level Synchronization: Built on advanced backplane architectures like PXI Express or CompactDAQ, these modules can share clock signals to synchronize measurements across hundreds of channels simultaneously.

• High Linearity and Low Noise: Designed with strict low-noise floor characteristics and advanced digital filtering, ensuring that the digital output represents the exact physical phenomenon without distortion.

• Unified Software Integration: Fully supported by the NI-DAQmx driver framework and LabVIEW, allowing engineers to configure channels, execute calibration scales, and stream data to disk using minimal code.

• Ruggedized Mechanical Form Factors: C Series modules feature solid encapsulation capable of enduring up to 50g of operational shock and 5g of vibration, making them suitable for in-vehicle testing and harsh industrial environments.

Product Applications

These analog measurement modules are extensively deployed across advanced engineering and scientific domains:

• Structural Health Monitoring: Measuring real-time structural deformation, stress, and vibration on bridges, buildings, and aircraft wings using strain gages and accelerometers.

• Automotive and Aerospace Testing: Collecting temperature profiles, pressure data, and fuel flow metrics from engine test cells, wind tunnels, and operational prototype vehicles.

• Acoustic and Vibration Analysis: Capturing audio signals and structural resonance frequencies for noise, vibration, and harshness (NVH) testing in consumer electronics and machinery.

• Environmental and Power Monitoring: Recording fluctuations in power grids, solar array outputs, and weather station instruments over long-duration data logging operations.

• Biomedical Device Validation: Acquiring low-voltage biological signals, fluid dynamics data, and pressure metrics during medical device design and certification processes.

Important Precautions

To preserve the accuracy of measurements and protect the module hardware, users must adhere to the following operation guidelines:

• Single-Ended versus Differential Wiring: Carefully choose the input configuration based on the sensor ground strategy. Incorrectly grounding a single-ended input can create ground loops that inject massive noise or damage the module.

• Shielding and Twisted Pairs: Always use high-quality shielded twisted-pair cabling for analog inputs. Connect the cable shield to the designated ground terminal at the DAQ side only to prevent noise induction from nearby power lines.

• Overvoltage Mitigation: Never exceed the absolute maximum voltage limits specified on the input pins. Applying voltages beyond the rail limits can trigger internal protection diodes, overheat the module, or destroy adjacent channels.

• Antialiasing Filter Verification: When measuring high-frequency components, ensure the sampling rate is set to at least twice the highest frequency component of interest, or enable the module’s onboard analog low-pass filters to prevent aliasing errors.

• Calibration Intervals: To maintain the specified absolute accuracy, modules must undergo routine factory or field calibration, typically every one to two years, to compensate for component aging and thermal drift.

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Shipping Port:  China

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Warranty: one year

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