The Agilent/Keysight N8481A is a thermocouple power sensor that delivers accurate average power measurements across wide frequency and dynamic ranges. Integrated EEPROM automatically stores calibration factors, eliminating manual entry and reducing measurement errors. The sensor achieves linearity of less than 1%, with linearity of ±0.52% from −1 dBm to +15 dBm and ±0.80% from +15 dBm to +20 dBm. Typical accuracy is 1% with maximum noise of 114 nW.
Technical Specifications
• Frequency Range: 10 MHz to 18 GHz
• Power Measurement Range: −35 dBm to +20 dBm
• Power Linearity: <1% ()
– −1 dBm to +15 dBm: ±0.52%
– +15 dBm to +20 dBm: ±0.80%
• Accuracy: Typically 1%
• Noise Floor: <114 nW (maximum)
• Standing Wave Ratio: 1.08 to 1.37 across frequency range
• RF Connector: Type-N (male)
• Dimensions: 38 mm (W) × 30 mm (H) × 130 mm (L)
• Weight: 0.181 kg
– Key Features
• Automatic calibration factor recall via integrated EEPROM
• NIST-traceable calibration and measurement standards
• Low mismatch uncertainty from excellent SWR performance
• High repeatability across dynamic range
– Compatibility & Integration
The N8481A interfaces with Keysight power meters including the EPM Series (E4418B, E4419B, N1913A, N1914A), EPM-P Series (E4416A, E4417A), and P-Series (N1911A, N1912A). Firmware upgrades may be required for some meters. Legacy compatibility with 8480 Series instruments is available via Option CFT. The sensor is not compatible with Keysight 43x, E1416A, N8262A power meters, 5314x microwave counters, or E7495x base station test sets.
