PXI-2585

The NI PXI-2585 is a high-current PXI switch module designed for applications that require routing significant power signals within an automated test system (ATE). Featuring 10 independent Single Pole Double Throw (SPDT) electromechanical relays, it can handle up to 12 A of continuous current and 300 V. This module is an essential component for engineers testing high-power electronics such as automotive motor controllers, industrial power supplies, and renewable energy systems where standard signal-level switches would fail.

1. Key Technical Specifications

Channel Count: 10

Relay Topology: SPDT (Form C)

Relay Type: Electromechanical (Non-latching)

Max Switching Voltage: 300 VDC / 300 VAC

Max Current: 12 A (Continuous per channel)

Max Switching Power: 300 W / 3600 VA

Path Resistance: < 0.02 $\Omega$ (Initial)

Switching Speed: 50 cycles per second

2. Detailed Technical Breakdown

High-Current Handling and Thermal Management

The defining feature of the PXI-2585 is its 12 A current capacity. To achieve this in the compact PXI form factor, the module utilizes heavy-duty copper traces and high-capacity electromechanical relays. The low path resistance of less than 20 $m\Omega$ is critical, as it minimizes voltage drops and heat dissipation even when the module is carrying full-rated current. This ensures measurement accuracy and protects the chassis backplane from thermal stress.

Flexible SPDT Topology

Unlike a dedicated multiplexer, the SPDT (Form C) configuration of the PXI-2585 allows each channel to act as a universal switch. Every channel has a “Common,” a “Normally Closed,” and a “Normally Open” terminal. This flexibility allows engineers to use the module for power rail switching, load simulation, or to build custom multiplexer/matrix architectures using external wiring.

Galvanic Isolation and Safety

With a 300 V rating and 12 A capacity, the PXI-2585 provides true galvanic isolation between the test signal and the PXI system. The electromechanical relays provide a physical air gap when open, which is necessary for safety during high-power functional testing and to prevent leakage currents from affecting the Unit Under Test (UUT).

3. Usage and Application Scenarios

Automotive Motor and Solenoid Testing

In automotive electronics, testing high-current loads like window motors, solenoids, and starter relays requires high-capacity switching. The PXI-2585 can route 12 A power signals to these components, allowing the ATE system to simulate real-world battery conditions and functional sequences.

Power Supply Burn-In and Validation

For industrial power supply manufacturing, the PXI-2585 acts as a load-routing hub. It can switch different resistive or electronic loads to the output of a power supply, enabling automated efficiency testing and long-term burn-in validation at full rated current.

Solar and Renewable Energy Systems

The module is frequently used in solar inverter and battery storage testing. Its 300 V rating allows it to handle the DC voltages typical of small-to-medium solar strings, while the 12 A capacity is sufficient for routing charging and discharging currents to test analyzers.

4. Product Comparison and Recommendations

NI PXI-2585 (The Current Leader)

10 channels, 300V/12A. Best for applications where current capacity (up to 12A) is the primary requirement.

NI PXI-2584 (High Voltage Specialist)

12 channels, 600V/2A. Best for applications requiring higher voltage isolation (up to 600V) rather than high current.

NI PXI-2586 (High Power Alternative)

10 channels, 300V/12A. Very similar to the 2585, but often used in slightly different connector configurations; check specific pinout requirements for your cable assemblies.

Summary

The NI PXI-2585 is a powerhouse module within the PXI ecosystem, bridging the gap between low-level signal switching and high-power industrial control. Its robust 12 A rating and 300 V isolation provide a reliable platform for the most demanding power-electronics test applications. We offer professional technical support for high-current system design and support project pricing for large-scale energy and automotive production line deployments.