Keysight Unveils EMI Test Receiver with Real-Time, 1 GHz Bandwidth

Keysight recently upgraded its PXE EMI Receiver, which now captures 30 MHz to 1 GHz in a single sweep with real-time, gapless analysis, slashing scan times and improving EMI sensitivity.

Keysight’s Electromagnetic Interference Test Receiver. Image (modified) used courtesy of Keysight Technologies

For design teams trying to keep pace with rapid product cycles, electromagnetic compatibility (EMC) testing is often where everything grinds to a halt. As circuit boards get more compact and devices more interconnected, tracking down electromagnetic interference (EMI) isn’t just tedious; it’s time-consuming and critical. Traditional receivers don’t make this easier, especially when they require multiple passes to cover common frequency ranges. Every extra step adds hours to the process and introduces more chances to miss short-lived emissions that might only appear occasionally.

That’s where Keysight’s latest upgrade to its PXE EMI Receiver steps in. The system now supports a full 1 GHz of real-time bandwidth, allowing engineers to scan from 30 MHz to 1 GHz in a single shot. No more stitching together segmented frequency chunks. This one-step scan doesn’t just save time; it changes how labs handle compliance and debugging. It's engineered to detect even low-level or intermittent signals without the usual delays or risk of blind spots.

Let's Talk Specs

The enhanced PXE (model N9048B) (datasheet linked) operates from 1 Hz to 44 GHz. For the upgraded scan, Keysight integrates a dedicated stream processor, the N9048BSPU, which enables continuous, real-time time domain scan (TDS) up to 1 GHz bandwidth. This means engineers can monitor EMI behavior live and with no signal gaps. Measurement precision is backed by -167 dBm displayed average noise level (DANL) at 1 GHz, with a phase noise figure of -114 dBc/Hz at 10-kHz offset.

When testing higher frequency bands, the PXE supports a 350-MHz, real-time bandwidth. It also provides multiple simultaneous views, such as frequency domain, time domain, and spectrogram. This allows users to get a complete picture of interference patterns.

There’s also a built-in pre-selector and low-noise amplifier (LNA) to ensure high dynamic range and sensitivity. The user interface is touch-based and intuitive. The whole system is built on Keysight’s X-Series platform, so it’s upgradeable for future requirements.

How the One-Step Scan Makes a Difference

Scanning the 30 MHz-to-1 GHz range once required three separate measurement passes. That alone could stretch testing time and leave small EMI events undiscovered between scans. Keysight’s one-step approach fixes that. Everything is captured in real time with no overlaps or missed frames. The benefits ripple outward.

A visual reference for how electromagnetic interference occurs. Image used courtesy of KEB

First, the test duration is cut dramatically; what once took hours now takes minutes. That’s a major productivity boost in high-volume environments. Second, real-time, gapless analysis improves test reliability, helping identify emissions from fast-switching power supplies, data buses, or mixed-signal ICs that might not consistently misbehave. It’s especially valuable for teams trying to isolate problems during development or failure analysis.

Built for Compliance Without the Guesswork

Beyond raw performance, the PXE receiver meets the latest EMC testing standards. It’s fully compliant with CISPR 16-1-1:2019, MIL-STD-461G, ANSI C63.2, and FCC regulations. Whether the use case is a consumer electronics device, an in-vehicle system, or a defense application, the PXE is ready for the certification process.

Depending on requirements, engineers can choose from configurations supporting 3.6 GHz, 26.5 GHz, or the full 44 GHz. All versions include time domain scanning and real-time analysis options. This makes the PXE platform suitable for both commercial labs and in-house testing environments. Real-time diagnostics, flexible frequency coverage, and software-driven control all contribute to a system that adapts to evolving certification needs without sacrificing accuracy.

A Faster Path Through EMI Testing

Electromagnetic interference isn’t going away, and as products evolve, testing is only getting more complicated. Keysight claims its upgraded PXE EMI Receiver cuts through that complexity with smarter bandwidth use, real-time data capture, and one-sweep coverage of crucial frequency bands. For engineers under pressure to meet deadlines without cutting corners, it’s a powerful tool that may turn compliance from a roadblock into a routine step.