The Keysight 8471D is a planar-doped barrier diode detector engineered for RF and low microwave signal detection, power measurement, and wideband video applications. Operating from 100 kHz to 2 GHz, this zero-bias detector delivers ±0.2 dB frequency response to 1 GHz and handles continuous input power up to 100 mW with short-term peaks of 0.7 W. The 8471D combines low-level sensitivity of 0.5 mV/µW with noise performance below 50 µV peak-to-peak, making it suitable for precision leveling loops and power monitoring circuits.
Technical Specifications
• Detector Type: Planar-Doped Barrier (PDB) diode
• Frequency Range: 100 kHz to 2 GHz
• Frequency Response: ±0.2 dB (100 kHz to 1 GHz); ±0.4 dB (1 GHz to 2 GHz)
• Input Impedance (SWR): <1.23 (DC to 1 GHz); <1.46 (1 GHz to 2 GHz)
• Maximum Continuous Input Power: 100 mW
• Maximum Short-Term Input Power: 0.7 W (<1 minute)
• Low-Level Sensitivity: 0.5 mV/µW
• Noise Floor: <50 µV peak-to-peak (CW, 100 mV output, 400 kHz bandwidth)
• Output Polarity: Negative (standard); positive (Option 103)
• Input Connector: BNC male
• Output Connector: BNC female
– Key Features
• Zero-bias operation eliminates external power supply requirements
• Square-law region extends to –10 dBm with Option 102
• Compact form factor: 63.4 mm × 15.64 mm × 13.72 mm; 38.8 grams
• Environmental specifications comply with MIL-STD 883 standards
• Operating temperature range: –20°C to +85°C
• Rated for 50,000 ft altitude operation
• Vibration and shock hardened (MIL-STD 883 Method 2007 and 2002.1)
– Typical Applications
• Leveling loop detection elements
• Power monitoring and measurement
• Wideband video detection in RF/microwave instrumentation
• Signal detection circuits
– Compatibility & Integration
BNC connectors on both input and output enable direct integration into standard RF test equipment and systems. Optional positive polarity output and extended square-law load option support varied circuit topologies and measurement requirements.
