PXIE-2531 National Instruments

PXIE-2531 National Instruments Programmable controller

Product  Description：

The National Instruments PXIe-2531 is a high-density PXI Express reed relay matrix module designed for high-speed automated test systems. It features 512 crosspoints configured in a 1-wire $4 \times 128$ matrix format. By utilizing compact reed relays, the module offers significantly faster switching speeds compared to traditional armature relays, making it an ideal choice for applications requiring rapid scanning or high-volume signal routing within a PXI Express chassis.

Product Specifications

The PXIe-2531 is engineered for precision and speed. It operates as a 1-wire $4 \times 128$ matrix, meaning it can connect any of its four rows to any of its 128 columns. The maximum switching voltage for this module is $60 \text{ VDC}$ or $30 \text{ VACrms}$ (CAT I), and it supports a maximum switching current of $0.5 \text{ A}$. The maximum switching power per channel is $10 \text{ W}$.

In terms of performance, the module boasts an impressive relay toggle rate of up to 2,000 cycles per second. The hardware is designed with a high-bandwidth signal path that typically supports up to $30 \text{ MHz}$. For connectivity, the PXIe-2531 utilizes a high-density 160-pin DIN connector on the front panel to interface with mass termination accessories or custom cabling.

Product Advantages

One of the primary advantages of the PXIe-2531 is its high-density architecture. Providing 512 crosspoints in a single PXI Express slot allows engineers to build large-scale switching systems without consuming excessive rack space. The use of reed relays provides a significant performance boost, offering much shorter actuation times and a longer mechanical life (typically up to 1 billion cycles) compared to electromechanical armature relays.

Furthermore, being a PXI Express module, it benefits from advanced synchronization capabilities. The module can utilize the PXI Express backplane triggers to synchronize switching operations with other instruments, such as digital multimeters (DMMs) or high-speed digitizers, without requiring external wiring. It also features onboard relay counting, which helps track the usage of each relay to facilitate predictive maintenance and ensure system reliability over time.

Important Considerations and Precautions

When deploying the PXIe-2531, it is critical to adhere to the voltage and current limits specified in the documentation. Exceeding the $60 \text{ VDC}$ limit can cause permanent damage to the reed relays or lead to safety hazards. Users must also be mindful of "hot switching"—opening or closing relays while a high-power signal is present—as this can significantly shorten the lifespan of the reed contacts due to arcing.

Proper signal shielding and cabling are essential to maintain the $30 \text{ MHz}$ bandwidth and minimize crosstalk between channels. Since the PXIe-2531 uses a high-density connector, it is highly recommended to use NI-approved accessories, such as the TB-2643B terminal block, to ensure secure and low-noise connections. Finally, always ensure the PXI Express chassis has adequate cooling, as the high density of relays can generate heat during intensive switching operations.

Product Applications

The PXIe-2531 is widely used in industries requiring large-scale automated data acquisition and signal routing. In semiconductor testing, it serves as a reliable interface for routing signals between a device under test (DUT) and various measurement instruments. It is also extensively used in automotive electronics testing for validating complex wiring harnesses and control units.

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Warranty: one year

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