II. Model Interpretation

PXI: PXI Hybrid Bus (compatible with PXIe Hybrid Slot) NI

2547: Serial Number, representing 2.7 GHz, single 8×1, electromechanical RF multiplexer NI

Alias: NI-2547, 8x1 Mux, SP8T RF Switch NI

Function Positioning: Single group 8-select-1 RF switch, electromechanical low loss, no built-in terminal, high-density channels, preferred choice for multi-DUT testing NI

III. Technical Parameters Basic parameters

Topology: Single group 8×1 (SP8T) multiplexer, CH0 to CH7 → COMNI

Relay type: Electromechanical latch relay (EMR)

Frequency range: DC to 2.7 GHz (–3 dB) NI

Characteristic impedance: 50 Ω (nominal) NI

Terminal configuration: No built-in 50 Ω terminal (requires external terminal or matching load)

RF performance (typical / guaranteed values)

Insertion loss:

≤1 GHz: <1.05 dB (typical <0.7 dB)

≤2.7 GHz: <2.0 dB (typical <1.6 dB)

Isolation:

1 GHz: >50 dB NI

2.7 GHz: >40 dB NI

VSWR: <1.3 (within 2.7 GHz) NI

Maximum switching power: +24 dBm (continuous) NI

Terminal power: No built-in terminal, external load ≤ 1.5 W @25 °C

Electrical and dynamic

Maximum switching voltage: 30 VAC / 42 VDC

Maximum switching current: 0.5 A (per channel)

Switching time: Typical 5 ms (electromechanical)

Relay lifespan: 1,000,000 times (typical), onboard counter tracking NI

DC path resistance: Initial <0.25 Ω; end-of-life ≥1.0 Ω

Physical and environmental

I/O connector: RF 9×SMA female (8 channels + 1 common terminal, gold-plated)

Size: 3U PXI single slot (approx. 216×20×130 mm)

Weight: Approx. 255 g (9 oz)

Power consumption: 12 V ≈0.35 W

Operating temperature: 0 to 55 °C

Storage temperature: –40 to 70 °C

IV. Interface and Communication Configuration

Front-end interface

RF interface: 9×SMA female (gold-plated)

CH0 to CH7: 8-channel RF input

COM: Common output

Trigger interface: No independent trigger (supports PXI backplane hardware trigger) NI

Bus and control

Bus interface: Standard 3U PXI mixed bus (compatible with PXIe mixed slot) NI

Control software: Compatible with NI- SWITCH, MAX, LabVIEW, TestStand, Switch Executive NI

Driver support: NI-DAQmx, NI-VISA, provides VI and API function libraries NI

Trigger synchronization: PXI hardware trigger, nanosecond-level synchronization, supports multi-module cascading NI

Configuration method: Software sets channel mapping, scan sequence, relay count reading NI

Adaptation and expansion

Adaptation cable: SMA-SMA direct connection; optional SMA to BNC/SMB/MCX NI

Expansion capability: Multi-module cascading, expand channel quantity, build large-scale RF switch system NI

V. Core Functions

Single 8×1 high-density routing: 8-select-1 signal switching, 8-channel RF input per slot, significantly increase DUT test density, save chassis slots.

DC to 2.7 GHz wideband coverage: Covers Bluetooth, WiFi, ISM, 2G/3G, etc., mainstream medium and low-frequency RF frequency bands, suitable for consumer electronics and industrial RF testing NI.

Electromechanical relay low loss: Compared to solid-state, lower insertion loss, lower cost, suitable for scenarios with sensitive to loss and moderate switching frequency, mass production NI.

No built-in terminal design: Flexible adaptation to external matching load or terminal, suitable for scenarios requiring custom terminals or high-power routing.

Relay count: Onboard counter, real-time counts switching times, predicts lifespan, reduces unplanned downtime NI. PXI Standard Integration: Single-slot 3U size, seamlessly integrated with PXI chassis, compatible with automated test systems, supporting hardware-triggered synchronization NI.

Six. Application Scenarios

Consumer Electronics RF Testing: Bluetooth, WiFi, 2G/3G, NFC module function verification and mass production testing, multi-DUT parallel polling NI.

High-density Multi-channel RF Switching: Signal source / spectrum analyzer / network analyzer channel expansion, 8 DUTs sharing 1 instrument, reducing testing costs NI.

Mass Production ATE Testing: Cost-sensitive, medium-low frequency, medium switching times mass production line, single-slot achieving 8 channels, maximizing chassis utilization NI.

Research and Development Laboratory: RF signal routing, instrument interconnection, solution verification, low-loss design ensures test accuracy NI.

Semiconductor RF Chip Testing: Mid-low frequency RF IC function verification, parameter testing, aging screening, multi-chip parallel testing NI.

Seven. Usage and Maintenance Instructions

Usage Points

Installation: Standard 3U PXI single-slot, lock the panel, ensure reliable contact of the backplane; avoid strong vibration and electromagnetic interference NI.

Connection: SMA connectors are lightly inserted and removed, avoid violent operation; RF power ≤ +24 dBm,严禁 operating beyond power； unused channels are recommended to be connected to 50 Ω terminations.

Power-on Status： By default， all channels are disconnected from COM， no built-in terminal， external matching load is required to avoid reflection.

Software Control： Use NI- SWITCH or LabVIEW VI for Connect/Disconnect； regularly read relay counts NI.

Environment： 0 - 55 °C operating temperature， dust-proof， moisture-proof， and dew-proof； away from strong electromagnetic interference sources， ensure good grounding.

Maintenance Instructions

Regular Inspection： Check every quarter for any looseness， oxidation or damage of SMA connectors； clean the panel and ventilation ports， maintain good heat dissipation NI.

Life Management： Mechanical and electrical relays approximately 1 million times； regularly read onboard counters， plan for replacement in advance to avoid downtime NI.

Fault Troubleshooting： First check SMA connection， external terminal and grounding； use MAX diagnostic switch status； take precautions against static electricity to avoid module damage NI.

Storage： Power off when not in use， cover SMA connectors with dust caps， dry and dust-proof storage， avoid high temperature， high humidity and strong magnetic field environments NI.

Calibration： It is recommended to calibrate once a year to ensure that insertion loss， isolation， VSWR， etc. indicators meet specifications； contact NI or a third-party calibration institution NI.