PXI-6238 National Instruments

PXI-6238 National Instruments Programmable controller

Product  Description：

The NI PXI-6238 is a specialized M Series multifunction data acquisition (DAQ) module designed by National Instruments for use in PXI environments. It is distinct from standard DAQ modules due to its bank-isolated architecture, which provides a high degree of protection and signal integrity in industrial settings. This module is specifically engineered to interface with current-based sensors and actuators, featuring analog inputs and outputs that operate within the standard $4 \text{ mA}$ to $20 \text{ mA}$ range. It offers a combination of analog I/O, digital I/O, and counter/timer functionality on a single 3U PXI card.

Product Parameters

• Analog Inputs: 8 differential channels designed for current measurements.

• Input Range: Standard $4 \text{ mA}$ to $20 \text{ mA}$.

• ADC Resolution: 16-bit resolution for high-precision data conversion.

• Sampling Rate: Maximum aggregate sampling rate of $250 \text{ kS/s}$ (kilo-samples per second).

• Analog Outputs: 2 channels supporting current output.

• Output Range: $4 \text{ mA}$ to $20 \text{ mA}$ with 16-bit resolution.

• Digital I/O: 6 sink/source protected digital input lines and 4 sink digital output lines.

• Counter/Timers: Two 32-bit counters for frequency measurement, pulse generation, and position encoding.

• Isolation: $60 \text{ VDC}$ continuous bank-to-bus isolation, providing a safety barrier between the measurement circuitry and the PXI backplane.

• Bus Interface: PXI (Peripheral Component Interconnect eXtensions for Instrumentation).

• Operating System Support: Compatible with Windows and Linux via NI-DAQmx driver software.

Product Advantages

The NI PXI-6238 offers significant advantages for industrial test and measurement. Its bank isolation is a primary benefit, as it protects the PXI chassis and the host PC from voltage spikes and ground loops, which are common in factory environments. Because it is designed for direct current measurement, users do not need to install external shunt resistors to convert current signals to voltage, which simplifies the wiring and reduces potential error sources. Furthermore, as an M Series module, it utilizes the NI-STC 2 system controller, which provides advanced timing and synchronization capabilities, allowing it to work in tandem with other PXI modules with microsecond precision. The integration of analog and digital I/O on a single board saves valuable slot space in a PXI chassis.

Important Considerations and Precautions

When using the NI PXI-6238, several precautions must be observed to ensure accurate data and equipment safety. First, ensure that the external power supply for the current loops is correctly sized and regulated, as the module requires an external source to drive the $4 \text{ mA}$ to $20 \text{ mA}$ signals. Second, while the module features $60 \text{ VDC}$ isolation, this is bank isolation, meaning all channels share the same common ground; if individual channel-to-channel isolation is required, a different module series must be selected. Third, users must ensure they are using the correct NI-DAQmx driver version to support the PXI-6238 hardware features. Lastly, always verify the current limits of the digital output lines to avoid "blowing" the internal protection fuses when driving inductive loads like relays.

Product Applications

The NI PXI-6238 is predominantly used in industrial automation and process control applications. It is an ideal choice for monitoring industrial sensors such as pressure transducers, flow meters, and temperature transmitters that output standard current signals. In the field of Control System Prototyping, it allows engineers to simulate or control industrial actuators like motorized valves and variable frequency drives (VFDs). It is also widely used in Automated Test Equipment (ATE) for verifying the performance of industrial electronics. In Environmental Monitoring, the module's isolation makes it suitable for long-distance signal transmission where ground potential differences might otherwise corrupt the data.

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