Keysight (Agilent) N1921A

The Keysight N1921A is a P-Series wideband power sensor for precise average power measurements across 50 MHz to 18 GHz. It delivers a dynamic range of –35 dBm to +20 dBm (peak power, >500 MHz) with average power measurement accuracy of ±0.2 dB or ±4.5%. The sensor integrates a DC reference source and switching circuits, enabling internal zeroing and calibration without disconnecting from the Device Under Test. This eliminates external calibration sources, reducing connector wear and measurement uncertainty.

The N1921A captures peak, peak-to-average ratio, average power, rise time, fall time, maximum power, minimum power, and statistical data of wideband signals. Video bandwidth and single-shot bandwidth both exceed 30 MHz, with rise time ≤13 ns at frequencies ≥500 MHz and minimum pulse width of 50 ns. Overshoot is held to ≤5%.

– Technical Specifications

• Frequency range: 50 MHz to 18 GHz
• Power measurement range: –35 dBm to +20 dBm (>500 MHz); –30 dBm to +20 dBm (50–500 MHz)
• Average power measurement accuracy: ±0.2 dB or ±4.5%
• Measurement uncertainty: 4% to 5% (frequency and temperature dependent)
• Video bandwidth: ≥30 MHz
• Single-shot bandwidth: ≥30 MHz
• Rise time: ≤13 ns (≥500 MHz)
• Minimum pulse width: 50 ns
• Overshoot: ≤5%
• Standing Wave Ratio: 1.2 typical; 1.2 to 1.26 (frequency dependent)
• Damage level (average): +23 dBm
• Damage level (peak, <1 μs): +30 dBm
• Internal trigger range: –20 to +20 dBm with 0.1 dB resolution
• Internal trigger latency: 160 ns ±10 ns; jitter ≤5 ns rms
• External trigger (TTL): 50 Ω impedance, 30 ns ±10 ns latency, ≤5 ns rms jitter
• Trigger delay range: ±1.0 s maximum
• Trigger hold-off: 1 μs to 400 ms
• Timebase accuracy: ±10 ppm; jitter ≤1 ns
• Zero set (CW): ≤0.175 ppm of input range
• Zero set (Peak): ≤150 ppm of input range

– Key Features

• Integrated DC reference source and switching circuits for in-situ calibration
• EEPROM storage of calibration factors, linearity data, temperature correction, and bandwidth correction
• Internal and external trigger capability with low jitter
• P-series connector

– Compatibility & Integration

Designed for test systems requiring simultaneous connection to the DUT during zeroing and calibration cycles.