Agilent/Keysight N1921A

The Keysight N1921A is a P-Series wideband power sensor engineered for precise power measurements across 50 MHz to 18 GHz. It measures average power, peak power, peak-to-average ratio, pulse characteristics, and statistical data with average power accuracy of ±0.2 dB or ±4.5%. The sensor integrates an internal DC reference source and switching circuits for zeroing and calibration without disconnecting from the device under test, reducing connector wear and measurement uncertainty.

All calibration factors, linearity, temperature, and bandwidth correction data are stored onboard in EEPROM for consistent performance across operating conditions.

Technical Specifications

• Frequency Range: 50 MHz to 18 GHz


• Power Range: −35 dBm to +20 dBm (−30 dBm to +20 dBm for 50–500 MHz)


• Average Power Measurement Accuracy: ≤ ±0.2 dB or ±4.5%


• Maximum Sampling Rate: 100 Msamples/sec continuous


• Video Bandwidth: ≥ 30 MHz (selectable: High, Medium, Low, Off)


• Single-Shot Bandwidth: ≥ 30 MHz


• Rise/Fall Time: <56 ns rise, <25 ns fall; ≤13 ns for frequencies ≥500 MHz


• Overshoot: <5%


• Maximum SWR: 1.2


• Minimum Pulse Width: 50 ns (recommended for meaningful measurements)


• Damage Level: +23 dBm average power; +30 dBm peak power (<1 μs duration)

Key Features

• Measures average power, peak power, peak-to-average ratio, pulse rise/fall time, pulse width, maximum/minimum power, and statistical data


• Internal zero and calibration eliminate need to disconnect from DUT


• EEPROM stores calibration, linearity, temperature, and bandwidth correction data


• Video output (BNC rear panel, 50 Ω impedance) provides DC voltage proportional to measured power


• Recorder output for user-defined upper/lower window measurements


• Precision Type-N male connector standard; 3.5 mm male option (N1921A-C35)


• Fixed sensor cable: 1.5 m standard; 3 m and 10 m optional lengths

Compatibility & Integration The N1921A is specifically compatible with Keysight P-Series power meters including the N1911A and N1912A.