Agilent/Keysight N2821A

The Keysight N2821A is a single-channel AC/DC current probe designed for precision measurement of low-level current flow in battery-powered devices, integrated circuits, and sub-circuit characterization. Its high sensitivity and dynamic range enable accurate signal reproduction with minimal loading effects across demanding measurement environments.

Technical Specifications

• Measurement Range: 50 µA to 5 A


• Bandwidth: 3 MHz (Zoom-Out Channel); 500 kHz (Zoom-In Channel)


• Dynamic Range: >1,000:1 (60 dB) normal; >20,000:1 (86 dB) with specific configurations


• Sensitivity: 50 mA


• Rise Time: <0.116 µs (Zoom-Out); 0.7 µs (Zoom-In)


• Noise Floor: 2 mA RMS (typical)


• Accuracy: ±1% of full scale ± probe gain accuracy, or ±1% of reading


• Maximum Input Voltage: 12 V (or ±300 V DC + peak AC with specific configurations)


• Input Coupling: AC/DC


• Output Connector: BNC


• Cable Length: 1.2 m


• Probe Length: 0.16 m


• Dimensions: 145 mm × 22.5 mm × 15.5 mm


• Weight: 70 g (without cable)

Key Features

• Interchangeable Rsense heads (20 mΩ, 100 mΩ, user-defined 1 mΩ to 1 MΩ)


• Make-Before-Break connector for non-destructive multi-point probing


• Compatible with Keysight AutoProbe high-impedance interface


• Powered by external Keysight oscilloscope or power supply


• Includes MBB receptacles, twisted leads, ground lead, and passive cable

Typical Applications

• Battery-powered device current consumption analysis


• IC power profiling and characterization


• Sub-circuit current measurement


• Low-level transient capture

Compatibility & Integration Compatible with 3000 X-Series, 4000 X-Series, Infiniium S-Series, 9000A Series, and 9000 H-Series oscilloscopes. Not compatible with Infiniium V, 90000A, 90000 X-, and 90000 Q-Series.