II. Model Interpretation

PXI: Standard PXI bus, compatible with PXIe mixed slots.

2585: NI high-power multiplexer series code, representing 10-channel 12 A single-wire multiplexer.

Full name: PXI-2585 10-channel 12 A single-wire PXI multiplexer module.

Topology: Fixed 1-Wire 10×1 (10 input channels → 1 common output channel), the topology cannot be reconfigured by software - NI.

III. Technical Parameters

(1) Switch and Electrical Characteristics

Topology: 10×1 single-wire multiplexer (10 SPST non-retentive relays) NI.

Relay type: Electromechanical single-sided stable (non-retentive), silver-nickel contacts.

Maximum switching voltage: 300 VDC / 300 Vrms (CAT II); channel-to-ground isolation 300 V; channel-to-channel isolation 300 V.

Single-channel maximum switching/carrying current: 12 A (resistive load).

Maximum switching power: DC 360 W; AC 3 kVA (60 Hz).

On-state resistance: Typical value **< 0.1 Ω** (low contact resistance).

Thermal offset: Typical value **< 50 µV**.

Operating bandwidth: ≥ 1 MHz (‑3 dB, 50 Ω).

Action time: Typical 8 ms, maximum 15.4 ms.

Channel isolation: 10 kHz > 80 dB; 100 kHz > 60 dB; 1 MHz > 40 dB.

Minimum load: 1 V / 10 mA.

(2) Life and Scan Parameters

Mechanical life: 1×10⁷ on-off cycles (1 V/10 mA).

Electrical life (resistive load):

30 VDC/10 A: 1×10⁵ times.

30 VDC/12 A: 3×10⁴ times.

Scan list: Maximum 32,000 programmable scan sequences.

Full-channel scan rate: Up to 65 times/second.

(3) Trigger and Control

Trigger channels: Supports PXI backplane Trigger 0~Trigger 7 hardware trigger bus.

Minimum trigger pulse width: 150 ns (disable digital filtering).

Built-in functions: Each relay has an independent counter, supporting life monitoring.

(4) Physical and Environmental Parameters

Form specification: Standard 3U PXI single-slot module, compatible with PXIe mixed slots.

Front-end connector: 20-pin Positronic GMCT series plug.

Form size: 216 mm × 20 mm × 130 mm.

Weight: Approximately 0.4 kg.

Power supply: PXI backplane 3.3 V/5 V; typical power consumption 2.5 W (3.3 V) + 5 W (5 V).

Operating temperature: 0 ℃ ~ 55 ℃.

Storage temperature: –20 ℃ ~ 70 ℃.

Relative humidity: 5% ~ 85%, no condensation.

IV. Interfaces and Topology Configuration

Front-end I/O interface

Connected through 20-pin Positronic GMCT connector:

10 input channels (CH0~CH9);

1 common output terminal (COM);

Power, ground and shielding pins, electrical isolation between channels.

Bus and software communication

Bus interface: Standard PXI backplane, compatible with PXIe mixed slots, automatically acquires power, clock, trigger.

Driver: Standard NI-SWITCH, compliant with IVI specification. Software support: LabVIEW, TestStand, LabWindows/CVI, Python, etc.

Basic functions: NI MAX can perform hardware recognition, channel status reading, scan editing, trigger configuration, and life count query.

Synchronization capability: The PXI trigger bus enables high-precision synchronous switching of multiple modules.

VII. Core functions

12 A current switching: Single channel 12 A capacity, suitable for high-power loads such as batteries, power supplies, and motors.

300 V high voltage isolation: CAT II 300 Vrms, 300 V isolation for both channel-to-ground and channel-to-channel, safe and reliable.

Low contact resistance: Typical < 0.1 Ω, reducing power loss and thermal errors.

Long-life electromechanical relays: Mechanical life of 1×10⁷ times, meeting long-term testing requirements.

Hardware triggering and scanning: 32,000-step scanning list, hardware automatically executes, improving high-power test throughput.

Relay life monitoring: Onboard counter records the number of on/off cycles, supporting predictive maintenance.

VI. Applicable scenarios

Battery testing: Large current charging and discharging switching, cycle life testing, equalization testing for lithium batteries / battery packs.

Automotive electronics: ECU, vehicle lights, motors, wiring harness, etc. high-power load switching and fault injection testing.

Power supply testing: DC-DC, AC-DC, battery simulator, etc. power supply module load switching and aging testing.

Industrial control: Electromagnetic valves, relays, heaters, etc. signal routing for large-power actuators.

ATE equipment: High-power function testing, reliability testing, power supply load testing system.

VII. Usage and maintenance instructions

Usage points

Installation: Insert into the 3U standard slot, tighten the panel screws, keep away from strong vibration / strong electromagnetic interference; PXIe chassis prefer mixed slots.

Connection: Match 20-pin Positronic GMCT cable, use thick wire diameter (≥1.5 mm²) for large current circuits and ensure reliable grounding.

Electrical limits: Strictly follow the 300 V/12 A rated parameters; for inductive loads (motors, solenoid valves), an external shunt diode must be connected to prevent high-voltage spikes from damaging contacts.

Topology selection: Fixed 10×1 single line, connect the common terminal to the load, input channels to different power sources / signal sources.

Heat dissipation: Ensure good ventilation of the chassis during high current operation to avoid overheating.

Maintenance instructions

Regular inspection: Inspect the 20-pin connector every quarter, clean dust, check for loose oxidation, and focus on temperature rise in large current circuits.

Life management: Regularly read the number of on/off cycles, plan to replace relays when approaching the electrical life limit.

Environmental control: Maintain dry and ventilated conditions, temperature 0~55 ℃, avoid condensation and dust accumulation.

Fault handling: First check wiring, grounding, and load type for abnormal channels; single-channel faults can be replaced with relays on-site.

Storage requirements: Disconnect cables when long-term in use, protect interfaces from dust, store in a dry environment at -20~70 ℃.

Calibration: It is recommended to calibrate once a year, test the on/off state, conduction resistance, isolation performance, and temperature rise.