Agilent/Keysight U8487A

The Keysight U8487A is a USB average power sensor delivering accurate CW RF power measurements from 10 MHz to 50 GHz. This thermocouple-based sensor measures average power across a 55 dB dynamic range (-35 dBm to +20 dBm) with linearity better than 0.8%. Onboard DC reference and switching circuits enable internal calibration without repeated connector cycles, while S-parameter and gamma correction functions compensate for impedance mismatch and component-insertion errors.

The sensor streams measurements at greater than 900 readings/second and integrates real-time measurement uncertainty calculation. Power is drawn directly from the USB port (400 mA), eliminating external supply requirements. The compact design measures 127.70 mm × 4 mm × 35.90 mm and connects via 2.4 mm female connector.

A standard 5 ft cable is included; 10 ft and 16.3 ft variants are available separately.

Technical Specifications

• Frequency Range: 10 MHz to 50 GHz


• Measurement Type: Average Power, CW RF Signals


• Power Range: -35 dBm to +20 dBm


• Dynamic Range: 55 dB


• Power Linearity: 900 readings/second (free run/fast buffer mode)


• Current Consumption: 400 mA (USB powered)


• Operating Temperature: 0 to 55 °C


• Storage Temperature: -40 to 71 °C


• Dimensions: 127.70 mm × 4 mm × 35.90 mm


• Weight: 0.22 kg


• Connector: 2.4 mm (female)

Key Features

• Real-time measurement uncertainty (MU) calculation


• S-parameter and gamma correction for impedance mismatch compensation


• Integrated DC reference and on-device calibration circuitry


• Direct USB power operation; no external power supply needed


• Built-in trigger-in function with BNC/SMB compatibility


• NIST/NPL-traceable calibration

Compatibility & Integration

• BenchVue software enabled


• N1918A power panel software included; N1918A power analysis manager available separately


• Windows 10, 8, 7, Vista, XP compatible


• Works with Keysight PNA/MXG and EPM power meters (N1913B/14B, N1913A/14A)


• Standard 1.5 m USB cable included; optional 3 m and 5 m extensions available