The InfiniiMax III/III+ probing system is a high-bandwidth oscilloscope probing solution for measuring differential and single-ended signals on today's high-density ICs and circuit boards. Four InfiniiMax III probe amplifiers ranging from 16 to 30 GHz let you match the probing solution to your performance and budget requirements. The N2830A/N7000A Series InfiniiMax III+ probing system is the next generation of InfiniiMax probing, expanding the measurement capabilities and usability of a probe capable of measuring all components of a differential signal.

An oscilloscope probe connects the device under test to the scope input while preserving signal fidelity, and at multi-gigahertz bandwidths the probe's loading and accuracy directly determine measurement quality. The InfiniiMax III/III+ heads support a wide variety of high-speed applications, from quick general-purpose troubleshooting of differential signals with the browser head to cabled measurements using 2.92 mm, 3.5 mm, or SMA coax, soldered connections for demanding measurements, and extended temperature testing across extreme temperature ranges.

ValueTronics stocks and holds its own inventory in a 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, giving buyers a single accountable source for this probing system and its accessories.

Brand Heritage

Keysight Technologies traces its roots to the Hewlett-Packard test and measurement business, which was spun off as Agilent Technologies in 1999 and then became Keysight Technologies in 2014. The InfiniiMax probe head topology was pioneered under that lineage.

Compare Other Models in This Series

The InfiniiMax III/III+ family spans a set of probe amplifiers and interchangeable probe heads built around a common architecture. Four InfiniiMax III amplifiers from 16 to 30 GHz address differing performance and budget needs, while the InfiniiMax III+ generation adds InfiniiMode and extends down to 4 GHz across the N2830A/N7000A Series. The InfiniiMax III+ works with the full array of InfiniiMax III probe heads and supports their full bandwidth.

All amplifiers share the proprietary 200 GHz fT InP IC process and per-amplifier S-parameter correction. Probe heads — browser, ZIF, 2.92 mm/SMA, solder-in, and QuickTip — are selected by use model rather than by tier, so the same head can be paired with different amplifiers within the family. InfiniiMax III and III+ amplifiers are not compatible with existing InfiniiMax I or II probe heads.

Each new model below is its own dedicated product page with condition-matched pricing. Select the probe amplifier or probe head that fits your bandwidth and connectivity requirements; the comparison table that follows summarizes how the family members differ.

The primary differences across the family are bandwidth tier and generation. InfiniiMax III amplifiers are offered at 16, 20, 25, and 30 GHz and are bandwidth upgradable at the service center; InfiniiMax III+ amplifiers, spanning 4 to 20 GHz in this lineup, add InfiniiMode for differential, single-ended, and common mode measurement through a single tip.

Probe heads also set the achievable bandwidth and loading: the browser reaches 30 GHz, the ceramic ZIF 28 GHz, the 2.92 mm/3.5 mm/SMA head 30 GHz, the solder-in heads 26 GHz, and the QuickTip 16 GHz, each with its own input capacitance. Refer to the comparison table for the specific bandwidth, transition time, and DC input figures associated with each head and amplifier pairing.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

Important: InfiniiMax III and III+ probe amplifiers are not compatible with InfiniiMax I or II probe heads, and InfiniiMax III/III+ probe heads are not compatible with InfiniiMax I or II probe amplifiers.

Important: The N5447A 200 Ω ZIF tip is not compatible with InfiniiMax III+ probes.

Important: The MX0104A performance verification and deskew fixture is required to calibrate and verify the performance of the InfiniiMax III probe. It comes with the 50 Ω through fixture only; order option 001 plastic stand or option N2787A 3D probe positioner. The MX0104A is a replacement of the N5443A.

Important: Probe bandwidth upgrades apply to InfiniiMax III only: purchase two or more upgrade options to go from 16 to 25 or 30 GHz and 20 to 30 GHz. To upgrade the probe bandwidth, send the probe to the Keysight service center.

Important: To use the InfiniiMax III+ probe on sampling oscilloscopes (86100C DCA-J), order the N1022B probe adapter and the 1143A probe offset control and power module.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.