Agilent/Keysight 85025A

The Agilent/Keysight 85025A is a coaxial detector for scalar network analyzer signal measurement across RF and microwave frequencies. It detects both modulated (AC) and unmodulated (DC) signals, delivering the dynamic range and precision required for accurate RF component characterization. Built with 50 Ohm input impedance and rated for +20 dBm maximum input power, the detector integrates directly with Keysight 8757 series analyzers via Type-N male connector (Option 001 available with precision 7 mm connector).

Technical Specifications

Frequency Range: 10 MHz to 18 GHz Dynamic Range:

• AC Mode: +16 dBm to −55 dBm


• DC Mode: +16 dBm to −50 dBm Input Impedance: 50 Ohms Maximum Input Power: +20 dBm (100 mW), ±10 VDC Return Loss:


• 10 MHz to 40 MHz: 10 dB


• 40 MHz to 4 GHz: 20 dB


• 4 GHz to 18 GHz: 17 dB Frequency Response (DC mode, −10 dBm input):


• 10 MHz to 40 MHz: +0.25 dB / −0.75 dB


• 40 MHz to 18 GHz: ±0.5 dB Physical: 1.22 m cable length; Type-N male connector standard

Key Features

• Dual-mode detection: AC and DC signal measurement


• Stable return loss across extended frequency range


• Flat frequency response within ±0.5 dB above 40 MHz


• Precision 50 Ohm matched input


• Cable-integrated design for direct analyzer connection

Typical Applications

• Network analysis and S-parameter measurement


• RF component insertion loss characterization


• Microwave filter and amplifier gain verification


• Signal power monitoring in 10 MHz–18 GHz band

Compatibility & Integration Designed exclusively for Keysight 8757 series scalar network analyzers. Not compatible with 8756 or 8755 series.