II. Model Interpretation

PXI: PCI eXtensions for Instrumentation, a PCI expansion bus standard for instruments.

2503: 2500 series (PXI switch module), 03 represents 48 channels, electromechanical relays, 1/2/4 lines, medium voltage type.

Part Number: 777697-01 (standard model).

Status: In stock (NI's current mainstream switch module).

III. Technical Parameters

Channel Configuration (Software Configurable):

1 line: 48×1 multiplexer

2 lines: 24×1, dual 12×1, four 6×1 multiplexers

4 lines: 12×1 multiplexer

Matrix: 2 lines 4×6 matrix

Electrical Characteristics:

Maximum switching voltage: 60 VDC, 30 VAC (effective value)

Maximum switching/carrying current: 1 A (per channel)

Maximum switching power: 30 W (per channel)

Relay Type: Electromechanical, low thermal offset (<1 μV)

Conduction Resistance: <1.5 Ω (typical)

Dynamic Performance:

Bandwidth: ≥10 MHz (50 Ω termination)

Scan Rate: Up to 100 channels/second

Scan List: 1,024 steps (deterministic scan)

Relay Life: ≥10^6 times (rated load)

Physical and Environmental:

Size: 3U PXI (100 mm×160 mm)

Weight: Approximately 0.23 kg

Operating Temperature: 0–50 °C; Storage: −20–70 °C

Humidity: 10%–90% RH (no condensation)

Power Consumption: Typical 370 mA, maximum 700 mA (+5 V) Data acquisition channel expansion: Expansion of PXI DAQ module channels to achieve synchronous high-channel number acquisition.

Research and laboratory: Material testing, electrochemical measurement, multi-channel monitoring, and precise instrument calibration by NI.

VII. Installation and Maintenance Instructions

Installation and Wiring:

Module: Unplug and then plug in, insert into the 3U slot of the PXI chassis, and tighten the fixing screws.

Terminal block: Use TB-2605, connect according to the topology (1/2/4 wires), avoid short circuits.

Grounding: Reliable connection of signal ground to chassis ground to reduce noise.

Software Configuration:

Install NI-SWITCH driver, NI-MAX recognizes the module, configure topology and scan list by NI.

Programming: Directly call the switch VI in LabVIEW, or control channel switching and scanning using C#/Python.

Daily Maintenance:

Cleaning: After power off, wipe the panel with a soft cloth to avoid liquid entering the interface.

Environment: Working temperature 0–50 °C, avoid dust, moisture, and strong electromagnetic interference.

Relay lifespan: Avoid overpressure / overcurrent (>60 V/1 A), regularly check the contact status.

Static protection: Wear an anti-static wristband when plugging in and out the module, ensure good grounding of the chassis.