The Agilent/Keysight U1818B is an active differential probe engineered for high-frequency in-circuit measurements across RF and microwave applications. It delivers precise signal acquisition when paired with network analyzers, spectrum analyzers, and signal source analyzers. The probe supports both single-ended and differential signal measurement, enabling non-invasive probing of RF traces without component removal. Flexible power delivery—via instrument probe port or external benchtop supply—accommodates diverse lab environments.
Technical Specifications
Frequency Range: 100 kHz to 12 GHz
Frequency Response: ±1.5 dB flatness across operating band
Noise Floor: Less than −130 dBm/Hz (10 MHz to 12 GHz)
Input Impedance:
• Differential: 50 kΩ @ 1 MHz
• Single-ended: 25 kΩ @ 1 MHz
Probe Attenuation: −10 dB nominal
Power & Biasing: Accepts power from instrument probe port or standalone benchtop supply; on-board LED indicates operational status
– Key Features
• Measures both differential and single-ended signals across RF traces
• Broad bandwidth with flat frequency response for accurate high-speed digital and RF characterization
• Low noise floor enables small-signal detection in demanding RF/microwave environments
• Flexible power sourcing for lab and field deployment
• Female SMA connectors on probe heads
– Typical Applications
• Wireline and wireless communications circuit validation
• High-speed digital design characterization
• Aerospace and defense RF signal analysis
• In-circuit RF measurements without test point preparation
– Compatibility & Integration
Direct compatibility with Keysight network, spectrum, and signal source analyzers. Operates with a range of interchangeable probe heads (ordered separately) including the N5380B, N5381B, N2893A, N5425B, and N5426A, plus extension cables and inline attenuators.
