The Keysight/Agilent 41800A is an active probe delivering high input impedance and minimal circuit loading for precision in-circuit measurements from 5 Hz to 500 MHz. Designed for use with network and spectrum analyzers, it enables detailed signal analysis, design evaluation, and quality control across audio, video, HF, and VHF frequency bands.
Technical Specifications
• Frequency Range: 5 Hz to 500 MHz
• Input Impedance: 100 kΩ with low input capacitance
• Gain: 0 dB
• Output Connector: Type N male (50 Ω)
• Maximum Allowable Input:
– AC+DC: ±40 V (probe alone)
– AC: 0.5 Vrms (probe alone)
– AC: 0.5 Vrms (with 1:1 divider)
– AC: 5 Vrms (with 10:1 divider)
– AC: 30 Vrms (with 100:1 divider)
• Average Noise Level: 10 nV/√Hz at ≥300 kHz
• 2nd Harmonic Distortion: < –50 dBc at –20 dBm (250 MHz input)
• 3rd Order Intermodulation Distortion: +3 dBm input at 500 MHz
• Weight: 0.3 kg (probe alone)
• Length: Approximately 1.2 m
• Operating Temperature: 0 °C to 55 °C
• Operating Humidity: ≤95% RH (at 40 °C)
• Power Requirements: +15 V / 60 mA, –12.6 V / 60 mA
– Key Features
• High 100 kΩ input impedance minimizes circuit loading effects
• Low input capacitance ensures accurate measurements without probe-induced errors
• 0 dB gain preserves signal integrity across the measurement chain
• Retractable metal sleeve protects the probe tip from physical damage and ESD
• Switchable attenuator dividers (1:1, 10:1, 100:1) extend voltage measurement range up to 30 Vrms AC
• Low noise performance (10 nV/√Hz at ≥300 kHz) suitable for sensitive circuit characterization
– Typical Applications
• Circuit signal analysis with network and spectrum analyzers
• Spurious level, harmonic, and noise measurement in circuit quality evaluation
• Gain, phase, and group-delay measurements at the circuit level
• Design evaluation for audio, video, HF, and VHF band applications
– Compatibility & Integration
The 41800A connects directly to Keysight network and spectrum analyzers equipped with front-panel probe power. Integration with other analyzer platforms requires the Keysight 11899A probe power supply. ESD sensitivity demands proper handling—avoid touching the probe pin and maintain contact with the protective metal sleeve during operation.
