Agilent / Keysight 85037B Precision Detector, 10 MHz to 26.5 GHz

The Agilent/Keysight 85037B is a precision dual diode detector engineered for high-accuracy power measurements across the 10 MHz to 26.5 GHz frequency band. Designed exclusively for integration with the 8757D Scalar Network Analyzer, this detector delivers corrected absolute power accuracy of 0.11 dB through automatic frequency response correction via internal EEPROM calibration data. The detector operates in both AC and DC modes, supporting dynamic ranges of +20 dBm to −55 dBm (AC) and +20 dBm to −50 dBm (DC).

When used with the 8757D Option 002 internal power calibrator, the detector achieves dynamic power accuracy of ±0.11 dB across measurement transitions. A 3.5 mm male connector provides the RF interface. Temperature stability is maintained at 0.01 dB/°C linearity drift after calibration, ensuring consistent performance across operating conditions.

Without the Option 002 calibrator, absolute power accuracy defaults to 0.40 dB for a 6 dB power change referenced to +20 dBm. The embedded frequency correction factors automatically compensate for detector response variations, eliminating manual correction procedures and improving measurement fidelity across the full frequency range. Reflection and transmission measurement capability is supported when the detector is combined with directional bridges, couplers, and sweep oscillator systems.

Technical Specifications

• Frequency Range: 10 MHz to 26.5 GHz


• Connector: 3.5 mm (male)


• Detection Modes: AC and DC


• AC Mode Dynamic Range: +20 dBm to −55 dBm


• DC Mode Dynamic Range: +20 dBm to −50 dBm


• Absolute Power Accuracy (with 8757D Option 002): 0.11 dB typical for 6 dB power change from +20 dBm reference


• Absolute Power Accuracy (default): 0.40 dB typical for 6 dB power change from +20 dBm reference


• Dynamic Power Accuracy: ±0.11 dB typical (post-calibration via Option 002)


• Temperature Coefficient of Linearity: 0.01 dB/°C after calibration

Key Features

• Dual diode detector architecture optimized for scalar network analysis


• Internal EEPROM stores detector-specific frequency response corrections


• Automatic calibration data retrieval by 8757D eliminates manual compensation


• Operates in AC and DC detection modes for measurement flexibility


• Optional 8757D Option 002 calibrator delivers enhanced absolute accuracy

Typical Applications

• Absolute and relative power measurements in scalar network analysis


• Reflection coefficient and transmission measurements with directional components


• Frequency-dependent power characterization across microwave bands

Compatibility & Integration Compatible With: Agilent/Keysight 8757D Scalar Network Analyzer Not Compatible With: 8755, 8756, 8757A, 8757C, 8757E Scalar Network Analyzers