InfiniiMax Probes

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Meet the industry's highest bandwidth probes

Introducing the Keysight InfiniiMax 4 Series, the industry’s highest-bandwidth probes for digital debugging and validation using UXR-B Series oscilloscopes.

50+ GHz bandwidth: Measure high-speed signals including IEEE 802.3ck and PCIe® 6.0 — no custom test fixtures required.
Flexible, modular design: Probe anywhere in the link for quick analysis and debug with the head's flexible tip.
Bessel-Thomson filter: Test 400G / 800G systems with precise probing of 53 GBd PAM4 signals.

High-speed probing applications

PCIe 6.0 transmitter test

The InfiniiMax 4 probes make probing the 64 GT/s PAM4 signals of PCIe 6.0 possible. With their high bandwidth and exceptional signal fidelity, InfiniiMax 4 enables accurate signal integrity analysis and jitter characterization when optimizing and testing PCIe designs. When paired with an Infiniium UXR B-Series oscilloscope and Keysight's suite of PCIe debug and compliance test automation software solutions, digital developers can rely on InfiniiMax probes as essential tools for PCIe debugging and compliance.

Learn more about PCIe 6.0 testing

PCIe 6.0 Transmitter Compliance Test scope and monitor with software

400G / 800G electrical transceivers

As data center speeds approach 800G, precision probing is critical for validating systems without custom test fixtures. InfiniiMax 4 probes empower engineers to measure 112 GBd PAM4 signals accurately. Paired with a Keysight Infiniium UXR B-Series oscilloscope and analysis software, these probes are crucial for debugging high-speed data center network transceivers, helping to ensure compliance, reliability, and interoperability across the evolving IEEE and Optical Internetworking Forum (OIF) standards.

Learn more about Ethernet transceiver testing

800G test solution with oscilloscope, BERT, and AWG

DDR5 memory debug and validation

The InfiniiMax probes are instrumental in addressing the significant design and test challenges posed by high-speed double data rate (DDR) memory technologies. InfiniiMax probes feature low-loading capacitance to ensure accurate signal integrity analysis and jitter characterization, which are crucial for optimizing DDR5 designs. Versatile tips allow for probing individual traces or analyzing differential pairs when performing eye diagram analysis and compliance testing.

Learn more about DDR5 transmitter test

Find the InfiniiMax probe that's right for you

MX0032A InfiniiMax 4 RCRC Probe Amp, 52 GHz with 40 GHz Bessel-Thomson

The InfiniiMax 4 series probes, a recent innovation from Keysight, stand out as the market’s premier high-bandwidth probing solution. This probe incorporates Keysight's cutting-edge designs and leverages Keysight-proprietary InP IC process technology. It is meticulously engineered to tackle the complexities of assessing next-generation high-speed signals, delivering unparalleled performance and precision.

MX0031A InfiniiMax 4 RCRC Probe Amp, 52 GHz

MX0030A InfiniiMax 4 RCRC Probe Amp, 42 GHz

MX0041A InfiniiMax 4 Differential Solder-In Probe Head – 52 GHz

MX0042A InfiniiMax 4 Differential Solder-In Probe Head – 42 GHz

MX0040A InfiniiMax 4 Probe Head Connector

MX0020A InfiniiMax Ultra Probe Amplifier, 10 GHz

The best solution to easily and accurately probe small devices using the fully-integrated flexible micro probe head.

MX0021A InfiniiMax Ultra Probe Amplifier, 13 GHz

The best solution to easily and accurately probe small devices using the fully-integrated flexible micro probe head.

MX0022A InfiniiMax Ultra Probe Amplifier, 16 GHz

The best solution to easily and accurately probe small devices using the fully-integrated flexible micro probe head.

MX0024A InfiniiMax Ultra Probe Amplifier, 20 GHz

The best solution to easily and accurately probe small devices using the fully-integrated flexible micro probe head.

MX0025A InfiniiMax Ultra Probe Amplifier, 25 GHz

Best probes for measuring signals found in the latest DDR5 and MIPI standards.

N2830A InfiniiMax III+ Series Probe Amplifier, 4 GHz

Easily switch between differential, single-ended, and common mode without adjusting probe tip connections

N2831A InfiniiMax III+ Series Probe Amplifier, 8 GHz

Easily switch between differential, single-ended, and common mode without adjusting probe tip connections

N2832A InfiniiMax III+ Series Probe Amplifier, 13 GHz

Easily switch between differential, single-ended, and common mode without adjusting probe tip connections

N7000A InfiniiMax III+ Series Probe Amplifier, 8 GHz

Use for general-purpose, high-speed differential bus probing or to measure all the components of a differential signal.

N7001A InfiniiMax III+ Series Probe Amplifier, 13 GHz

Use for general-purpose, high-speed differential bus probing or to measure all the components of a differential signal

N7002A InfiniiMax III+ Series Probe Amplifier, 16 GHz

Use for general-purpose, high-speed differential bus probing or to measure all the components of a differential signal.

N7003A InfiniiMax III+ Series Probe Amplifier, 20 GHz

Use for general-purpose, high-speed differential bus probing or to measure all the components of a differential signal.

MX0109A InfiniiMax III GHz Extreme Temperature Solder-in Head, 26 GHz

Supports extreme temperature testing of circuits and devices in temperatures ranging from -55 to +150°C.

N2801A InfiniiMax III Series Probe Amplifier, 20 GHz

The InfiniiMax III probing system provides the highest bandwidth and incredibly low loading to allow for a completely new level of signal fidelity and accuracy.

N2802A InfiniiMax III Series Probe Amplifier, 25 GHz

The InfiniiMax III probing system provides the highest bandwidth and incredibly low loading to allow for a completely new level of signal fidelity and accuracy

N2838A InfiniiMax III PC Board ZIF Tips, 25 GHz

Offers a 6:1 attenuation ratio and plastic forks to aid in soldering the tips to the DUT; includes five tips.

N2803A InfiniiMax III Series Probe Amplifier, 30 GHz

The InfiniiMax III probing system provides the highest bandwidth and incredibly low loading to allow for a completely new level of signal fidelity and accuracy.

N2812B InfiniiMax III Cable, 35 GHz

Provides excellent flexibility with high quality measurements to match the performance of 90000 X-Series oscilloscope.

N2848A InfiniiMax III QuickTip Probe Head

Uses magnets to provide quick connect/disconnect when probing multiple high-speed test points.

N2849A InfiniiMax III QuickTip Tips

Connects magnetically to the matching probe head for a quick and secure connection; includes four tips.

InfiniiMax III Differential Connectivity Kit

Use with InfiniiMax III/III+ probe amps; includes probe heads and tips to get up to speed on evaluation and development

N5444A InfiniiMax III Probe Head

Connect two 2.92-mm, 3.5-mm, or SMA cables to make a differential measurement on a single oscilloscope channel.

N5445A InfiniiMax III Browser Head

Troubleshoot differential signals with Z-axis compliance and variable spacing from 20 to 125 mil.

N5439A InfiniiMax III ZIF Probe Head

Provides 28 GHz bandwidth in a replaceable tip form factor; ZIF tips can be left on the DUT as the probe head is moved.

1168B InfiniiMax II Series Probe Amplifier, 10 GHz

Provides a large common mode range and a large offset range for measuring differential and single-ended signals.

1169B InfiniiMax II Series Probe Amplifier, 12 GHz

Keysight 1169B probe is a 12 GHz real-time bandwidth probe that provides a large common-mode range and a large offset range for measuring differential and single-ended signals.

N5381B InfiniiMax II Differential Solder-In Probe Head, 12 GHz

Reach into tight spaces with 4-in lead length; offers a reliable semi-permanent connection and very low loading

N2833A InfiniiMax II Differential Connectivity Kit

Use with InfiniiMax II probe amps; includes probe heads and tips to get up to speed on evaluation and development

N2837A InfiniiMax II Browser Tip Kit

Includes 20 spring-loaded replacement tips and 20 solid replacement tips for secure probing contact with the N2839A.

N2839A InfiniiMax II Differential Browser, 12 GHz

Achieve the measurement fidelity of a solder-in probe head with handheld browsing and extremely low loading.

1130B InfiniiMax Probe, 1.5 GHz

Provides extremely low input capacitance, flat frequency response, and resistor probe tip technology.

1131B InfiniiMax Probe, 3.5 GHz

Provides extremely low input capacitance, flat frequency response, and resistor probe tip technology

1132B InfiniiMax Probe, 5 GHz

Provides extremely low input capacitance, flat frequency response, and resistor probe tip technology.

1134B InfiniiMax Probe, 7 GHz

Use for high-speed differential or single-ended probing in embedded designs

E2668B InfiniiMax Single-ended Connectivity Kit

Use for single-ended measurements; includes one single-ended browser, one solder-in probe head, and one socketed probe head

E2669B InfiniiMax Differential/Single-ended Connectivity Kit

Includes a differential browser, four solder-in differential probe heads, and two socketed differential probe heads

E2675B InfiniiMax Differential Browser, 6GHz

Use for general purpose hand-browsing and troubleshooting signals; includes 20 replaceable probe tips

E2676B InfiniiMax Single-ended Browser Probe Head

Troubleshoot single-ended signals with Z-axis compliance where the small size of the probe head is the primary concern

E2677B InfiniiMax Differential Solder-In Probe Head, 12 GHz

Reach into tight spaces with 4-in lead length; includes 20 full bandwidth and 10 medium bandwidth damping resistors.

E2678B InfiniiMax Single-ended/Differential Probe Head

Measure either differential or single-ended signals via a plug-on socket connection

E2679B InfiniiMax Single-ended Solder-in Probe Head

Reach into tight spaces with 4-in lead length; includes damping and 0 Ω ground resistors.

MX0100A InfiniiMax II Micro Probe Head Kit

Perform probing on high-speed devices with this small, high-performance, reusable probe head.

MX0104A Performance Verification and Deskew Fixture for InfiniiMax Probes

Calibrate and deskew probe amplifiers and verify the performance of the probe using a VNA

MX0105A InfiniiMax Differential SMA Probe Head, 21 GHz

The MX0105A is a differential SMA probe head that provides 21 GHz of bandwidth and allows you to connect two SMA cables to make differential measurements on an oscilloscope channel.

MX0106A InfiniiMax Differential Solder-in Head, 23 GHz

The MX0106A is a solder-in head allowing a soldered connection into the target for reliable hands-free connection. This probe head provides 23 GHz bandwidth and low capacitive loading.

N2851A InfiniiMax I/II QuickTip Probe Head

Uses magnets to provide quick connect/disconnect when probing multiple high-speed test points.

N2880A InfiniiMax In-line Attenuator Kit

Measure larger signals with faster edges by increasing the dynamic range and offset range of the probe system.

N2884A InfiniiMax Differential Fine-Wire Probing Tips

Debug and test ICs with this high-fidelity, high-bandwidth 12-GHz solution for R&D and test engineers

N2887A InfiniiMax Soft Touch Pro Probe Adapter

Adapt the Pro Series soft touch logic analyzer to the InfiniiMax I and II Series input connectors.

N2888A InfiniiMax Soft Touch Pro Half-Channel Probe Adapter

Adapt the Pro series half-channel soft touch logic analyzer footprint to the InfiniiMax I and II series input connectors.

N5425B InfiniiMax Differential ZIF Probe Head, 18 GHz

Probe signals with a considerable amount of test points in tight spaces, such as a DDR memory system.

N5426A InfiniiMax ZIF Tips, 20 GHz

Use this economical RoHS compliance solder-in probing solution for maximum bandwidth in a replaceable tip form factor.

N5450B InfiniiMax Extreme Temperature Extension Cable

Probe your device’s signals in extreme testing conditions with this 92-cm pair of matched cables.

N5451A InfiniiMax Differential Long Wire ZIF Tips

Extend your ZIF tip connection up to 11 mm with this economical, solder-in probe solution; set includes 10 ZIF tips.

Related products

Infiniium UXR‑B Series Oscilloscopes

From 5 GHz - 110 GHz, developing next generation technology requires world-class signal integrity from your test equipment with Keysight's UXR-Series oscilloscope.

Infiniium MXR B-Series Real-Time Oscilloscopes

Keysight's MXR-Series real time oscilloscope, from 500 MHz to 6 GHz on all 8 channels, a real time spectrum analyzer, 8 instruments integrated in one.

Infiniium EXR-Series Oscilloscopes

From 500 MHz to 6 GHz on all 8 channels, 7 instruments integrated in one, hardware accelerated plotting, and fully upgradeable.

Additional probes and accessories

In addition to the InfiniiMax Series RC and RCRC high-bandwidth oscilloscope probes, Keysight has a large collection of passive, active, current, optical, high-voltage, and other probes. Find the right tools for your project.

Oscilloscope probes and accessories