The Keysight N2839A InfiniiMax III+ differential probe head delivers solder-in probe measurement fidelity in a hand-held form factor. This high-performance accessory connects to InfiniiMax probe amplifiers to enable accurate capture and analysis of high-speed differential and single-ended signals across demanding laboratory and enterprise environments. Its extremely low input capacitance and minimal loading preserve signal integrity on the Device Under Test even at high frequencies.
Technical Specifications
Bandwidth
• Up to 21 GHz when paired with InfiniiMax Ultra MX0025A probe amplifier
• Up to 12 GHz when used with InfiniiMax II 1169A or 1169B probe amplifiers
• Actual bandwidth is the lesser of the N2839A and connected amplifier specifications
Input Impedance & Loading
• Input capacitance: 0.21 pF—comparable to solder-in probe heads
• Extremely low probe loading maintains signal fidelity in high-speed circuits
Mechanical Design
• Thumbwheel-controlled tip span: 0 mm to 3 mm adjustment range
• Spring-loaded probe tips ensure secure DUT contact
• Replaceable tips for maintenance and damage mitigation
• Low-inductance ground spring maintains constant frequency response across span settings
• Serial numbers US5900 and higher ship with both spring-loaded and straight tip options
Included Accessories
• Browser head
• 20× or 40× replaceable tips (configuration-dependent)
• Protective cap
• ESD-safe tweezer for tip replacement
– Key Features
The probe head combines spring-loaded connection mechanics with replaceable tip architecture to support field maintenance without sacrificing RF performance. The low-inductance ground spring design decouples frequency response from mechanical span positioning, critical for consistent measurements across different DUT geometries. Tip and span control elements are deliberately compact and require careful handling to preserve high-frequency performance.
– Typical Applications
Signal integrity analysis, high-speed differential measurements, single-ended signal probing, and laboratory characterization of advanced semiconductor and enterprise systems.
– Compatibility & Integration
Supported InfiniiMax Probe Amplifiers
• InfiniiMax Ultra: MX0020A, MX0021A, MX0022A, MX0024A, MX0025A
• InfiniiMax RC: MX0023A
• InfiniiMax II: 1168A, 1168B, 1169A, 1169B
• InfiniiMax I: 1130A, 1130B, 1131A, 1131B, 1132A, 1132B, 1134A, 1134B
Probe Positioners
• N2784/5A and N2787A positioners provide hands-free probe stability.
