II. Model Interpretation

PXI: Standard PXI bus, compatible with PXI/PXIe mixed-slot NI.

2797: NI high-frequency RF interface series code, representing 40 GHz, 50Ω, single SP6T, built-in termination multiplexer NI.

Full name: PXI-2797 40 GHz 50Ω 6×1 termination RF multiplexer module NI.

Topology: Single SP6T (6 select 1), 6 input channels, 1 output channel; Unselected channels automatically 50Ω termination NI.

III. Technical Parameters

(1) RF Core Characteristics

Topology: Single 6×1 (SP6T), 1 bank NI

Impedance: 50Ω NI

Bandwidth: DC～40 GHz NI

Insertion Loss: ≤1.1 dB @40 GHz NI

Isolation: ≥60 dB @40 GHz NI

Return Loss: ≥15 dB @40 GHz

Termination: Built-in 50Ω termination (all unselected channels) NI

Termination Power: 1 W/channel (25℃), total power ≤3 W NI

(2) Electrical Rated Values

Maximum Switching Voltage: 30 VAC (cold switching) NI

Relay Type: Electromechanical Relay (EMR) NI

Action Time: ≤5 ms

Mechanical Life: 1×10⁶ times (rated load)

(3) Physical and Environmental

Form: Standard 3U PXI single-slot module

Front-end Connector: SMA (female) ×7 (6 input + 1 common output) NI

Size: 216 mm × 20 mm × 130 mm

Weight: Approximately 0.45 kg

Power Supply: PXI backplane 5 V; Typical power consumption 4 W

Operating Temperature: 0 ℃～55 ℃

Storage Temperature: –20 ℃～70 ℃

Humidity: 5%～85%, no condensation

IV. Interface and Communication Configuration

(1) Front-end I/O Interface

SMA Female ×7:

CH1～CH6: 6 RF input channels

COM: Common output 

Compatible with 50Ω coaxial cable, supporting high-frequency signal transmission.

(II) Bus and Software Communication

Bus Interface: Only supports PXIe Hybrid Slot / PXI Peripheral Slot NI.

Driver: NI-SWITCH, compliant with IVI specification.

Software Support: LabVIEW, TestStand, LabWindows/CVI, Python, C, .NET.

Basic Functions: NI MAX hardware identification, channel switching configuration, relay status monitoring, life counting.

Trigger Capability: Supports PXI backplane Trigger 0-7, multi-module synchronous switching.

VII. Core Functions

6×1 Built-in termination multiplexing: Unselected channels automatically terminate at 50Ω to eliminate open-circuit reflection and protect front-end high-power devices NI.

40 GHz Bandwidth: Covers microwave and millimeter-wave frequency bands from DC to 40 GHz, supporting harmonic, radio frequency, and high-speed digital signal switching NI.

Low Insertion Loss + High Isolation: Insertion loss ≤ 1.1 dB at 40 GHz, isolation ≥ 60 dB, ensuring signal integrity and reducing crosstalk NI.

High Reflection Suppression: Built-in termination to avoid high-power signal reflection, suitable for high-power RF source, amplifier testing scenarios NI.

Single-slot High Density: 3U PXI single-slot realizes 6-in-1-out, saving cabinet space, suitable for multi-channel RF routing NI.

Relay Life Monitoring: Board-mounted counter records the number of on/off cycles, supports predictive maintenance, reducing downtime risks.

VI. Application Scenarios

RF Up/Down Conversion Testing: Transmit high-order harmonics of PXI RF up-converter or route multiple signal sources to down-converter NI.

5G / Millimeter Wave Equipment Testing: 40 GHz bandwidth compatible with 5G millimeter-wave frequency band, used for base station, terminal, RF chip switching testing.

High-Power RF Testing: Built-in termination to suppress reflection, suitable for high-power DUT testing of power amplifiers, transmitters, etc. NI.

Multi-source Synchronous Testing: Multiple signal sources (signal generators, antennas, sensors) access the analyzer in a time-sharing manner to improve testing efficiency.

Satellite / Aviation Electronics Testing: High-frequency signal routing, redundant switching, suitable for satellite communication, radar, aviation RF testing requirements.

VIII. Installation and Maintenance Instructions

(1) Installation and Power On

Only install in PXIe Hybrid Slot or PXI Peripheral Slot, do not use pure PXIe slot NI.

Before installation, turn off the power, fully insert the module and tighten the panel screws.

After powering on, confirm the device identification is normal and there are no errors in NI MAX.

(2) Connection and Operation

Use 50Ω SMA coaxial cable, ensure the connector is clean and tightened to avoid signal leakage and reflection.

Cold Switching Operation: Switch the relay when there is no signal to avoid arc damage to the contacts.

Termination Attention: Unselected channels have built-in termination, no additional load required; avoid exceeding 1 W/channel power NI.

Programming Control: Configure channel switching, scanning sequence, and trigger synchronization through NI-SWITCH API.

(3) Maintenance and Lifespan

Regularly read the relay on/off times through NI MAX, replace when approaching 1×10⁶ times.

Maintain ventilation and cooling, working temperature ≤ 55 ℃, avoid accelerating aging due to high temperature.

Avoid overpressure and overcurrent operations, prevent contact oxidation or adhesion.

When not in use for a long time, store in a dry environment (-20 ℃ to 70 ℃), cover the interface with a dust cap.