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What is the Keysight XR3 XR3L4A?
The Keysight InfiniiVision XR3 (model XR3L4A) is a 1U rack-mountable low-profile oscilloscope with 4 analog and 16 digital channels, a 14-bit ADC, a noise floor under 50 µVrms and an update rate of more than 1.3 million waveforms per second. Multiple XR3 units synchronize into one system of more than 100 channels sharing a single timebase.
⬇ Download the Keysight XR3 data sheet (PDF)PDF, 25 pages, 1.9 MB, English
Keysight introduced the XR3 on 3 November 2026 for rack-based automated test systems where engineers need more channels in less rack space. It brings the signal integrity of a full-size bench oscilloscope into 1U, helping aerospace and defense, manufacturing and high-energy physics teams move from bench-level confidence to rack-based scale.
The XR3 belongs to Keysight’s Essential XR3 class together with the HD3 series, such as the Keysight HD304MSO oscilloscope.
14-bit ADC and digital trigger on the MegaZoom 5 ASIC
A custom 14-bit ADC and a low-noise front end deliver a noise floor under 50 µVrms at full bandwidth, a noise density under −161 dBm/Hz. The fully digital trigger works on acquired data, so it is jitter-free and sensitive down to a single LSB. The real-time zone trigger runs directly on the acquisition path and qualifies signals at 6.4 billion tests per second, so intermittent events that cross a drawn zone are always captured. Real-time zoom, floating magnify and color grading run in the ASIC without reducing the update rate.
More than an oscilloscope
The same 1U box adds a 16-channel logic analyzer, a protocol analyzer, five counter/totalizers with 12-digit resolution, four 4.5-digit DVMs and a frequency response analyzer with Bode sweeps up to 10 decades. A 100 MHz 14-bit arbitrary waveform generator is available as an option. Fault Hunter evaluates signals against user-defined criteria for anything from a few minutes to two days.
Scale XR3 to more than 100 channels
Through the autosensing 10 MHz reference in/out, every XR3 shares a common clock and trigger, so all channels use the same timebase. Three hardware automations handle multi-instrument setup:
- Auto-discover: each scope reports its own IP address, so the system finds and configures instruments without manual network setup.
- Auto-sync: the 10 MHz reference clocks align across all instruments, locking clock and trigger to one timebase.
- Auto-deskew: the MegaZoom 5 ASIC delay lines calibrate automatically to correct skew across the system.
Each unit runs the native InfiniiVision interface with protocol decode, power-supply testing and jitter analysis on the instrument, plus embedded VNC and web servers. To view many units on one screen, Infiniium 2026 software (a free download for Windows PCs) shows signals from multiple XR3 instruments in one UI and adds real-time and offline analysis.
Keysight XR3L4A specifications
| Model | XR3L4A — InfiniiVision XR3 Low Profile Oscilloscope |
|---|---|
| Channels | 4 analog + 16 digital (D0–D15) |
| Bandwidth (−3 dB) | 200 MHz (standard), 350 MHz, 500 MHz, 1 GHz |
| Rise time (10–90%) | ≤ 2.0 ns / ≤ 1.3 ns / ≤ 900 ps / ≤ 450 ps by bandwidth |
| Maximum sample rate | 3.2 GSa/s per channel (all channels); digital channels 1.6 GSa/s |
| Maximum memory depth | 100 Mpts per analog channel; 20 Mpts digital |
| Vertical resolution | 14 bits (16 bits in HD mode) |
| Noise floor | Under 50 µVrms at full bandwidth; noise density −161.2 dBm/Hz (−38 dBm range) |
| Waveform update rate | Over 1,300,000 waveforms per second |
| Input impedance | 50 Ω ± 1.5% or 1 MΩ ± 1% ‖ ~24 pF |
| Input sensitivity | 50 Ω: 100 µV/div – 1 V/div; 1 MΩ: 100 µV/div – 10 V/div |
| Maximum input voltage | 1 MΩ: 135 Vrms, 190 Vpk; 50 Ω: 5 Vrms, 15 Vpk (not rated for CAT II, III or IV) |
| Dynamic range | SFDR 79 dB; signal-to-noise dynamic range 96 dB |
| Timebase | 500 ps/div – 5,000 s/div; accuracy ±1.6 ppm + aging |
| Segmented memory | Up to 256,000 segments, 700 ns re-arm time |
| Trigger | Real-time zone trigger at over 1,300,000 triggers per second; edge, pulse width, runt, setup & hold, pattern, window… |
| Display | 3.2-inch 256 × 64 OLED status display; external Full HD 1920 × 1080 display over DisplayPort |
| Multi-scope sync | Autosensing 10 MHz reference in/out; auto-discover, auto-sync, auto-deskew; more than 100 channels |
| Connectivity | LAN 10/100/1000Base-T; 3 × USB 3.0 (2 front, 1 rear); 1 × USB 2.0 rear (USBTMC); Aux out BNC |
| Built-in tools | 5 counters with 12-digit resolution, 4 DVMs with 4.5 digits, frequency response analysis (Bode up to 10 decades), Fault Hunter, mask test, FFT |
| Waveform generator (option) | 100 MHz WaveGen, 14-bit AWG — option XR3LWAVEGEN |
| Internal storage | Up to 10 GB for instrument files; secure erase with option XR3LSECURE |
| Power | 100 – 240 V, 50/60 Hz; 275 W maximum |
| Environment | 0 – 50 °C, up to 3000 m |
| Dimensions (W × H × D) | 42.6 × 6.1 × 36.3 cm (1U) |
| Weight | 4.2 kg |
| Calibration | 3-year calibration interval; 1 year of KeysightCare Assured included |
⬇ Download the Keysight XR3 data sheet (PDF)PDF, 25 pages, 1.9 MB, English
Source: Keysight data sheet “InfiniiVision XR3 Low Profile Oscilloscope”, 3126-1847.EN, 3 November 2026. Values are typical unless the data sheet marks them as warranted; please check against your order configuration.
Choosing bandwidth and options
| Bandwidth (−3 dB) | Rise time (10–90%) | Order code |
|---|---|---|
| 200 MHz (standard) | 2.0 ns | XR3L4A-200 |
| 350 MHz | 1.3 ns | XR3L4A-350 |
| 500 MHz | 900 ps | XR3L4A-500 |
| 1 GHz | 450 ps | XR3L4A-01G |
Every unit includes 200 MHz, 100 Mpts and the 16-channel MSO interface. Bandwidth can be upgraded after purchase with licenses XR3LBW-001 to XR3LBW-006. System options are the 100 MHz WaveGen (XR3LWAVEGEN) and enhanced security (XR3LSECURE: disable non-volatile memory, disable USB and LAN ports, block firmware upgrades, password protection). The N3100A rackmount kit is optional.
| Package | Function | Model |
|---|---|---|
| Embedded | I2C, SPI, UART (RS232/422/485) trigger & decode | XR3LEMBA |
| Automotive | CAN, CAN FD, CAN XL, SENT, LIN, 10BASE-T1S | XR3LAUTA |
| Aerospace & defense | MIL-STD 1553, ARINC 429 | XR3LAERA |
| Power analysis | Power quality, current harmonics, switching loss, transient response, PSRR… | XR3LPWRA |
| USB | USB 2.0 and USB PD trigger, decode and search | XR3LUSBA |
| Quick jitter | Jitter analysis and clock recovery | XR3LQJTA |
| Ethernet | 10BASE-T, 100BASE-TX, 10BASE-T1S | XR3LETHA |
| Ultimate bundle | All 7 software packages above | XR3LBDLA |
Using the XR3 with the Keysight XR8
Pair the XR3 with the Keysight Infiniium XR804KA oscilloscope to build one system from two scopes: the XR8 handles high-speed signal integrity measurements and the XR3 adds low-noise high-impedance inputs for low-speed debug and power analysis. Engineers can probe power rails, clocks and control lines on the XR3 while every XR8 channel stays free for high-speed signals. XR3 channels appear next to the XR8 channels in Infiniium 2026, and systems scale to 4, 8 or more channels as needs grow.
What is the XR3L4A used for?
Rack-based automated test
Many synchronized channels in 1U for ATE systems and end-of-line production test stations.
Aerospace & defense
High channel density test systems, with MIL-STD 1553 and ARINC 429 decode in the XR3LAERA package.
High-energy physics
More than 100 time-correlated channels for experiments that need many simultaneous measurement points.
Frequently bought with the XR3L4A
Keysight recommends passive, active, power rail and current probes for the XR3, for example the N2843A passive probe, N2795A active probe, N7020A power rail probe and the Keysight 1147B AC/DC current probe. The N2756A 16-channel MSO cable and the N3100A rackmount kit complete a rack installation.
Keysight XR3 XR3L4A FAQ
How do you operate the Keysight XR3 without a large display?
How many XR3 units can be synchronized?
Can I upgrade the bandwidth of a 200 MHz XR3L4A later?
How does the XR3 work with the XR8 oscilloscope?
Where can I buy a genuine Keysight XR3 in Vietnam?
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