# Keysight N2802A 25 GHz InfiniiMax III Probe Amplifier (Pre-Owned) # Keysight N2802A 25 GHz InfiniiMax III Probe Amplifier (Pre-Owned) ## Key Features At A Glance - Probe amplifiers from 4 GHz to 30 GHz across the InfiniiMax III/III+ series to match performance and budget - InfiniiMode (InfiniiMax III+) captures differential, single-ended, and common mode through one tip without reconnecting - Each probe amplifier carries its own measured S-parameters for more accurate probe response correction - InfiniiMax III amplifiers are bandwidth upgradable (16 to 20/25/30 GHz) at the Keysight service center - Probe heads include browser, ZIF, 2.92 mm/3.5 mm/SMA, solder-in, and magnetic QuickTip styles - MX0109A extreme-temperature solder-in head rated -55 to +150 °C per JEDEC JESD22-A104 revision E - Proprietary 200 GHz fT InP (indium phosphide) IC process for high bandwidth with extremely low loading 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. Every used unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer. ## 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 pre-owned 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. Model Bandwidth Probe System InfiniiMode **N2802A** 25 GHz InfiniiMax III No N2803A 30 GHz InfiniiMax III No N7003A 20 GHz InfiniiMax III+ Yes N2801A 20 GHz InfiniiMax III No Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Product Core & Specifications InfiniiMax III/III+ Warranted Specifications Probe Head Probe Amp Bandwidth DC Input N5440A\_N5439A ceramic 450 Ω ZIF tip and ZIF probe head N2803A 30 GHz probe amp 26 GHz Rdiff=100 kΩ ± 2%, Rse=50 kΩ ± 2% N5445A 450 Ω browser N2803A 30 GHz probe amp 28 GHz Rdiff=100 kΩ ± 2%, Rse=50 kΩ ± 2% MX0109A/N2836A 450 Ω solder-in probe head vertical orientation with no ground wires Differential mode N7003A 20 GHz probe amp 20 GHz Rdiff=100 kΩ ± 2%, Rse=50 kΩ ± 2% InfiniiMax III/III+ Probe Head Characteristics (−3 dB bandwidth / 10 to 90% transition time / 20 to 80% transition time) Probe Head Input C InfiniiMax III (N2803A 30 GHz amp) Differential Mode InfiniiMax III+ (N7003A 20 GHz amp) Differential Mode N5440A\_N5439A ceramic 450 Ω ZIF tip and ZIF probe head Cdiff=32 fF; Cse=44 fF 28 GHz, 15.5 pS, 11.0 pS 20 GHz, 21.7 pS, 15.4 pS N5447A\_N5439A ceramic 200 Ω ZIF tip and ZIF probe head Cdiff=32 fF; Cse=44 fF 28 GHz, 15.5 pS, 11.0 pS N/A N5445A 450 Ω browser Cdiff=35 fF; Cse=50 fF 30 GHz, 14.5 pS, 10.3 pS 20 GHz, 21.7 pS, 15.4 pS N2838A\_N5439A PC board 450 Ω ZIF tip and ZIF probe head Cdiff=95 fF; Cse=130 fF 25 GHz, 17.4 pS, 12.3 pS 20 GHz, 21.7 pS, 15.4 pS MX0109A/N2836A 450 Ω solder-in probe head vertical orientation with no ground wires Cdiff=108 fF; Cse=140 fF 27 GHz, 16.1 pS, 11.4 pS 20 GHz, 21.7 pS, 15.4 pS MX0109A/N2836A 450 Ω solder-in probe head flat orientation with minimum length ground wires Cdiff=108 fF; Cse=140 fF 27 GHz, 16.1 pS, 11.4 pS 20 GHz, 21.7 pS, 15.4 pS N2849A\_N2848A 450 Ω QuickTip and QuickTip probe head with ground wires connected Cdiff=340 fF; Cse=200 fF 16 GHz, 27.1 pS, 19.3 pS 20 GHz, 21.7 pS, 15.4 pS N5444A 2.92 mm, SMA, 3.5 mm probe head N/A 30 GHz, 15.5 pS, 11.0 pS 20 GHz, 21.7 pS, 15.4 pS InfiniiMax III/III+ Probe Amp Characteristics Features N280XA InfiniiMax III — 450 Ω probe heads N280XA InfiniiMax III — 200 Ω probe heads N280XA InfiniiMax III — N5444A 2.92 mm, SMA, 3.5 mm probe head N283XA InfiniiMax III+ — 450 Ω probe heads N283XA InfiniiMax III+ — N5444A 2.92 mm, SMA, 3.5 mm probe head DC input resistance Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% 55 Ω to Vterm Rse=50 kΩ ± 2% each input to ground, Rdiff=100 kΩ ± 2% and Rcm=25 kΩ ± 2% 55 Ω to Vterm Input resistance > 10 kHz Rse=500 Ω each input to ground, Rdiff=1 kΩ and Rcm=250 Ω Rse=500 Ω each input to ground, Rdiff=1 kΩ and Rcm=250 Ω 50 Ω to .901\*Vterm Rse=500 Ω each input to ground, Rdiff=1 kΩ and Rcm=250 Ω 50 Ω to .901\*Vterm Input voltage range (differential or single-ended), mains isolated 1.6 Vpp, ± 0.8 V (HD2&3 < −34 dbc), 2.5 Vpp, ± 1.25 V (HD2&3 < −38 dbc) 0.8 Vpp, ± 0.4 V (HD2&3 < −34 dbc), 1.6 Vpp, ± 0.8 V (HD2&3 < −38 dbc) 1.6 Vpp, ± 0.8 V (HD2&3 < −34 dbc), 2.5 Vpp, ± 1.25 V (HD2&3 < −38 dbc) 2.5 Vpp or ±1.25 V at 5:1 attenuation, 5.0 Vpp or ± 2.50 V at 10:1 attenuation 2.5 Vpp or ± 1.25 V at 5:1 attenuation, 5.0 Vpp or ± 2.50 V at 10:1 attenuation without violating max input power Max input power N/A N/A 125 mW calculated by {\[rms(vin-vterm)\]^2/55\]} for each input N/A 125 mW calculated by {\[rms(vin-vterm)\]^2/55\]} for each input Input common mode range ± 2 VDC to 250 Hz, ± 1.25 V > 250 Hz ± 6 VDC to 250 Hz, ± 0.65 V > 250 Hz ± 6 VDC to 250 Hz, ± 1.25 V > 250 Hz without violating max input power ± 7 VDC to 100 Hz, ± 1.25 V > 100 Hz at 5:1 attenuation, ± 2.5 V > 100 Hz at 10:1 attenuation ± 6 VDC to 100 Hz, ± 1.25 V > 100 Hz at 5:1 attenuation, ± 2.5 V > 100 Hz at 10:1 attenuation without violating max input power DC attenuation ratio 6:1 3:1 6:1 5:1 or 10:1 Automatically selected based on volts/division (all modes) 5:1 or 10:1 Automatically selected based on volts/division (all modes) Offset range (for probing a single-ended signal) ± 16 V ± 8 V ± 6 V without violating max input power ± 16 V ± 6 V without violating max input power Input referred noise spectral density 23.9 nV/rt (Hz) 12.0 nV/rt (Hz) 23.9 nV/rt (Hz) Diff 5:1 atten 33.5 nV/rt (Hz); Diff 10:1 atten 53.9 nV/rt (Hz); SE A or B 5:1 atten 27.8 nV/rt (Hz); SE A or B 10:1 atten 47.7 nV/rt (Hz); CM 5:1 atten 21.8 nV/rt (Hz); CM 10:1 atten 38.4 nV/rt (Hz) Diff 5:1 atten 33.5 nV/rt (Hz); Diff 10:1 atten 53.9 nV/rt (Hz); SE A or B 5:1 atten 27.8 nV/rt (Hz); SE A or B 10:1 atten 47.7 nV/rt (Hz); CM 5:1 atten 21.8 nV/rt (Hz); CM 10:1 atten 38.4 nV/rt (Hz) Input referred noise example 4 mVrms with 28 GHz probe head and 30 GHz probe amp 2 mVrms with 28 GHz probe head and 30 GHz probe amp 4 mVrms 4.5 mVrms in diff mode 5:1 atten with >= 18 GHz probe head and 13 GHz probe amp 4.5 mVrms in diff mode 5:1 atten with 30 GHz N5444A probe head and 13 GHz probe amp Maximum input voltage 18 Vpeak mains isolated 18 Vpeak mains isolated 8 Vpeak without violating max input power 18 Vpeak mains isolated 8 Vpeak without violating max input power > **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. ## About this Pre-Owned unit This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects. - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). 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.** ## Details - **Price:** 0.0 USD - **Vendor:** Keysight - **Type:** Act Prob - **Tags:** Act Prob, Agilent, Agilent Keysight, Amplifier, Inc., Keysight, Keysight Technologies, Manufacturers, Model 2802, N2802, N2802A, Other Equipment, Pre-Owned, Probe, product_manual_group_3, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | ## Images - Keysight N2802A 25 GHz InfiniiMax III Probe Amplifier (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/n2802a-agilent-probe-amplifier-used) > Updated: 2026-06-03