Model Explanation

PXI: PXI bus standard (PCI eXtensions for Instrumentation)

2555: Product serial number, specifically referring to a 4×1 75Ω RF multiplexer

Full Name: PXI-2555 / 778572-55 → 2.5 GHz 75Ω Terminated 4×1 Multiplexer (SP4T)

Topology Alias: NISWITCH_TOPOLOGY_2555_4X1_TERMINATED_MUXNI Technical Specifications

RF Performance

Bandwidth: DC～2.5 GHz

Characteristic Impedance: 75 Ω (suitable for video / CATV)

Terminal Matching: Built-in 75Ω terminal resistor for each channel

Insertion Loss: ≤0.6 dB @ 2.5 GHz

VSWR: ≤1.3:1 @ 2.5 GHz

Channel Isolation: ≥60 dB @ 2.5 GHz

Switching and Electrical

Topology: 4-channel input → 1-channel output (SP4T)

Relay Type: RF latching relay

Maximum Channel Current: 0.5 A (per channel)

Terminal Power: 1.5 W @ 25°C (temperature rating at high temperature)

Relay Life: ≥10⁶ times (typical value)

Control Interface: PXI bus (NI-SWITCH driver)

Physical and Environmental

Size: Standard PXI 3U single slot

Weight: Approximately 0.45 kg

Connectors: Front panel BNC (4×CH input, 1×COM output)

Operating Temperature: 0～55°C

Storage Temperature: –40～70°C

Interface and Communication Configuration

Front Panel Interface

CH1～CH4: 4-channel BNC input, with 75Ω terminal

COM: 1-channel BNC common output, with 75Ω terminal

Backplane and Control

PXI Backplane: 3U single slot, compatible with PXI-1/PXIe mixed slots

Power Supply: PXI backplane ±15 V, 5 V power supply

Trigger: Supports PXI TTL0～TTL4 hardware trigger, software immediate trigger

Driver: NI-SWITCH, supports LabVIEW, TestStand, CVINI

Core Function

75Ω RF Signal Routing: 4-out-of-1 switching, DC～2.5 GHz, suitable for video / CATV systems

Built-in Terminal Matching: 75Ω terminal for each channel, eliminating open-circuit reflections, protecting signal source

High-Fidelity Signal Transmission: Low insertion loss, low VSWR, high isolation, ensuring signal integrity

Relay Life Tracking: Built-in counter, predictive maintenance, reducing downtime

PXI Plug-and-Play: Standard driver, quick integration into automated test systems

Application Scenarios

Video / Cable Television (CATV) Testing: Signal routing, switching, and quality verification

RF Component Testing: Filters, amplifiers, attenuators within 2.5 GHz for automated testing

Aerospace / Defense: RF signal switching, satellite communication equipment testing

Semiconductor Testing: RF chips, transceivers verification

Industrial ATE: RF / Video function testing for mass-produced electronic products

User and Maintenance Instructions

Installation and Configuration

Insert into the 3U single slot of PXI, fix the panel

Install NI-SWITCH driver, identify the hardware

Configure the topology as 4×1 Terminated Mux

Connect BNC cables, avoid excessive force bending and twisting of NI

Operation Points

Terminal Power Limit: Single channel terminal power ≤1.5 W at 25°C, temperature rating at high temperature

Avoid Static Electricity: Ground before operation to prevent damage to RF relays by static electricity

Trigger Method: Software immediate trigger or PXI TTL hardware trigger, synchronize test process

Maintenance and Calibration

Life Monitoring: Read relay closing times via NI-SWITCH, warning when reaching 10⁶ times

Regular Calibration: Calibrate insertion loss, VSWR, and isolation every year to ensure test accuracy

Environmental Requirements: Operating temperature 0～55°C, humidity 10%～90% (no condensation)

Storage: –40～70°C, dry, dust-proof, long-term storage before cleaning connectors