Agilent / Keysight N8488A Thermocouple Power Sensors 10 MHz to 67 GHz -35 to +20 dBm

The Keysight N8488A is a thermocouple power sensor designed for precise RF and microwave power measurements from 10 MHz to 67 GHz across a dynamic range of -35 dBm to +20 dBm. It delivers <1% power linearity and high measurement repeatability, making it ideal for calibration, system characterization, and RF power analysis in laboratory and field environments.

Technical Specifications

• Frequency Range: 10 MHz to 67 GHz (not warranted 67–70 GHz)


• Power Measurement Range: -35 dBm to +20 dBm


• Connector: 1.85 mm male


• Measurement Type: Average/CW


• Power Linearity: <1%


• Temperature Compensation: 0 to 55 °C operational; zero procedure re-application recommended below -25 dBm if temperature variations exceed ±5 °C

Key Features

• EEPROM Calibration Storage: Onboard EEPROM eliminates manual calibration entry; factors auto-download to connected power meter


• Low SWR: Excellent standing wave ratio minimizes mismatch uncertainty


• Dual-Range Power Measurement: Enhanced sensitivity to fluctuating signal levels


• NIST Traceability: Calibration traceable to U.S. National Institute of Standards and Technology


• Annual Calibration Cycle: Keysight recommends yearly recalibration

Typical Applications RF and microwave power calibration, transmitter characterization, component testing, system validation, and broadband power measurement across commercial and millimeter-wave frequencies.

Compatibility & Integration Compatible Power Meters:

• Keysight EPM series (N1913/14B, N1913/14A, E4418/19B)


• EPM-P series (E4416/17A)


• P-Series (N1911/12A, N8262A)


• Not compatible with 400 Series power meters Control Codes: SCPI codes compatible with E-Series sensors and most 8480 Series codes. Option CFT provides 8480 Series compatibility (excluding N8488A).