PXI-6238 National Instruments

PXI-6238 Instruments GPIB-RS232 GPIB Serial Port Converter

Brand：National Instruments Model number：PXI-6238

Country of origin: United States Product weight：0.12kg

HS code：8517623990

Product Details：

Product Dimensions：

The National Instruments PXI-6238 is an M Series multifunction data acquisition (DAQ) module designed specifically for industrial environments. It provides integrated high-current analog inputs and is engineered to maintain high measurement accuracy even in the presence of common-mode noise or ground loops. Unlike standard DAQ modules that measure voltage, the PXI-6238 is optimized for sensing current signals, making it an ideal interface for industrial sensors and transmitters.

Product Parameters

The PXI-6238 features a robust set of technical specifications tailored for precision measurement and control:

Analog Input Channels: 8 bank-isolated differential channels.
Measurement Range: Designed for current measurements, typically supporting 0 mA to 20 mA or 4 mA to 20 mA ranges.
ADC Resolution: 16 bits, ensuring high-fidelity signal conversion.
Sampling Rate: A maximum aggregate sampling rate of $250 \text{ kS/s}$ across all channels.
Isolation: Features $60 \text{ VDC}$ continuous bank isolation, which protects the PXI backplane and enhances signal integrity.
Analog Output: 2 channels with 16-bit resolution, capable of generating voltage signals.
Digital I/O: 6 industrially rugged digital input lines and 4 digital output lines, capable of handling up to $30 \text{ V}$ levels.
Counter/Timers: Two 32-bit counters for frequency measurement, pulse generation, and edge counting.
Bus Connector: Standard PXI (3U) form factor compatible with PXI and PXI Express hybrid slots.

Product Advantages

Direct Current Measurement: Unlike many DAQ boards that require external shunt resistors to measure current, the PXI-6238 allows for direct connection to 4-20 mA loops, reducing wiring complexity and potential error sources.
Industrial Ruggedness: The bank isolation feature significantly reduces the risk of damage to the host system caused by high-voltage transients or ground loops, which are common in factory floor environments.
High Accuracy: Using NI-M Series technology, the module incorporates the NI-PGIA 2 amplifier, which is optimized for fast settling times at high scanning rates, ensuring that accuracy is maintained even when multiple channels are sampled rapidly.
Flexible Triggering: The module includes the NI-STC 2 system controller, which provides advanced timing and synchronization capabilities, allowing for complex triggering schemes between different PXI modules.
Software Integration: It is fully compatible with NI-DAQmx driver software, allowing for easy configuration and programming within LabVIEW, C#, Python, and MATLAB.

Important Considerations and Precautions

Proper Grounding: Although the module features bank isolation, it is critical to ensure that the common-mode voltage does not exceed the specified $60 \text{ VDC}$ limit relative to the earth ground to prevent equipment failure.
Terminal Compatibility: The PXI-6238 typically requires specific shielded cables and connector blocks (such as the SCC series or standard 68-pin SCSI cables) to maintain the noise rejection benefits of its differential inputs.
Heat Dissipation: Ensure the PXI chassis has adequate cooling and airflow, as multifunction modules can generate significant heat during high-speed sampling or continuous output operations.
Current Limits: Never exceed the maximum rated current for the analog inputs. Applying high voltage directly to the current-sensing inputs without proper current-limiting impedance can damage the internal sensing circuitry.
Calibration: For mission-critical applications, the module should be calibrated annually to account for environmental drift and ensure measurements remain within the specified tolerance.

Product Applications

The NI PXI-6238 is widely used in sectors requiring precise monitoring of industrial sensors.

Industrial Process Monitoring: Directly interfacing with 4-20 mA transmitters used for measuring pressure, flow, temperature, and level in chemical or water treatment plants.
Automotive Testing: Monitoring current-based sensors in vehicle test cells where electrical noise from motors or dynamometers might interfere with standard voltage signals.
Power Management Systems: Tracking current consumption in industrial machinery to analyze efficiency or detect potential mechanical failures.
Control System Prototyping: Using the analog outputs and digital I/O to create closed-loop control systems for industrial actuators while simultaneously monitoring sensor feedback.
Factory Automation: Serving as a centralized data logging hub within a PXI chassis to synchronize measurements from various parts of an assembly line.

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