Agilent/Keysight 33330C

The Agilent/Keysight 33330C is a broadband coaxial diode detector for signal detection and power monitoring across microwave and millimeter-wave frequencies. Built around a Low-Barrier Schottky (LBS) diode, it requires no external bias and operates without active amplification, making it ideal for integration into automated test systems and OEM instrumentation. This detector delivers stable performance from 10 MHz to 26.5 GHz with exceptional frequency response flatness: ±0.6 dB from 10 MHz to 20 GHz, and ±1.5 dB to 26.5 GHz.

Octave band flatness reaches ±0.2 dB to 8 GHz. Input matching is optimized across the band, with VSWR of 1.2 from 10 MHz to 4 GHz, 1.5 from 4 to 18 GHz, and 2.2 from 18 to 26.5 GHz.

Technical Specifications

• Frequency Range: 10 MHz to 26.5 GHz


• Measurement Range: −35 dBm to +20 dBm


• Dynamic Range: 55 dB


• Low-Level Sensitivity: >0.5 mV/µW (10 MHz to 18 GHz); >0.18 mV/µW (18 GHz to 26.5 GHz)


• Power Handling: 200 mW maximum operating input; 1 W typical short-term maximum (<1 minute)


• Output Noise: 50 µV


• Output Polarity: Negative


• DC Output Impedance: 10 kΩ


• Operating Temperature Range: −65°C to 100°C


• Weight: 14 g

Key Features

• No bias required - passive LBS diode architecture


• Flat frequency response with <1.5 VSWR to 18 GHz


• APC-3.5 mm RF input connector (SMA compatible); BNC female DC output


• Field-replaceable diode modules for reduced downtime


• MIL-STD-883 environmental ruggedness qualification


• 55 dB dynamic range supports both low-level and high-power measurements

Typical Applications

• Microwave power monitoring and signal detection


• Automated test system integration


• Broadband RF measurement in production and R&D environments


• OEM instrument subsystems requiring passive detection

Compatibility & Integration The detector integrates into systems via standard APC-3.5 mm connectors and outputs DC voltage on BNC female connectors. Field replacement of diode modules supports long-term system serviceability.