Keysight's 1U XR3 Puts 14-bit Scopes in the Rack, 100+ Channels

By Amara Osei

Keysight's new XR3 packs a 14-bit oscilloscope into one rack unit (1U), synchronizes to over 100 channels, and offers selectable bandwidths from 200 MHz to 1 GHz. That's the headline, and it's a rack-density story more than a bench-performance story — which is exactly the point.

The instrument targets automated test systems in aerospace and defense, manufacturing, and physics, where a single bench oscilloscope no longer suffices. Engineers there now run several instruments in synchronization, and each additional box costs rack space, adds cabling, and introduces signal skew (unwanted timing offsets between channels). Until now, buyers chose between full-featured flexibility and a compact, scalable form factor. Keysight's argument is that the XR3 removes that trade-off.

What does the silicon deliver?

At the core sits Keysight's MegaZoom 5 custom ASIC (application-specific integrated chip) feeding a 14-bit ADC (analog-to-digital converter). The company specifies a 50-microvolt root-mean-square noise floor and an update rate of 1.3 million waveforms per second. Each channel carries 100 Mpts of acquisition memory, enough to capture small signals and rare events without dividing the capture into sessions.

Notably, the analysis functions — zoom, filters, zone triggering, and color-graded persistence — run in hardware, in real time, and don't degrade the 1.3-million-waveform rate. Datasheet claims, plainly labeled as such; Keysight gave no independent test conditions. But hardware offload of those functions is the right architecture for a rack instrument nobody will babysit.

Takeaway: the numbers read like a bench scope's, in a chassis that slides into a rack.

How do you get 100+ synchronized channels?

Synchronization is the XR3's real pitch. An autosensing 10 MHz reference input/output locks clocks and triggers across multiple units, so a multi-blade system can time-correlate more than 100 channels. Hardware-based auto-sync, auto-discovery, and auto-deskew (automatic removal of inter-channel timing offsets) strip out the manual fiddling that multi-instrument setups usually demand.

Four channels per unit, mixed-signal capable, with bandwidth scaled per application — 200 MHz where that's enough, 1 GHz where it isn't. Scaling performance to the job, rather than paying for ceiling everywhere, is what shortens debug cycles. At least, that's the vendor's time-to-market claim, and it's a reasonable one.

Takeaway: sync used to be the tax on high-density systems; Keysight has largely automated the paperwork.

What about software and the XR8 pairing?

Native software covers protocol decode, power-supply test, and jitter analysis — the everyday debug diet. Infiniium 2026 software, native to Keysight's XR8 oscilloscope, also runs on an external controller and gives engineers one screen to visualize and control multiple XR3 units.

There's a hardware pairing too. The XR3 mates with the next-generation XR8 to add low-noise, high-impedance (Hi-Z) channels affordably, without converting to a high-speed channel through an adapter. Anyone who has bought an adapter to solve a probe problem will appreciate that sentence.

Takeaway: the XR3 plays nicely with its bigger sibling, and the single-screen control model matters once you're past a handful of channels.

The adoption question

For rack-based test builders, the XR3 reframes the buying decision: capacity per rack unit, channel count under one time base, and whether 14-bit resolution at 200 MHz–1 GHz covers the physics of the signals in question. Price and availability weren't disclosed; Keysight directs inquiries to keysight.com. The question buyers should now ask isn't bench scope or modular digitizer — it's how many XR3 blades their backplanes, and budgets, can hold.