Agilent/Keysight N2798A

The Agilent/Keysight N2798A is a high-voltage differential probe designed for precision measurement of differential signals in power electronics, automotive testing, and industrial environments. It delivers 20 MHz differential bandwidth with selectable 100:1 or 1000:1 attenuation, supporting input voltages to 1000 V CAT III (100:1) or 2000 V CAT II (1000:1). The probe achieves superior common-mode rejection - exceeding 60 dB at 50/60 Hz - making it ideal for noisy measurement environments.

With ±2% DC accuracy and ±3% AC accuracy at 100 kHz, plus input impedance of 10 MΩ || 6 pF, the N2798A delivers reliable signal acquisition across a wide voltage range. Rise time of 17.5 ns typical and noise under 1 mV RMS ensure clean signal fidelity. The probe connects via BNC output to standard oscilloscope inputs and operates from oscilloscope power delivery (typically 5 V to 15 V), drawing less than 4.5 VA.

Technical Specifications

• Differential Bandwidth: 20 MHz


• Single-Ended Bandwidth: 100 MHz (typical)


• Attenuation Ratio: 100:1 / 1000:1 (selectable)


• DC Accuracy: ±2% of reading


• AC Accuracy: ±3% of reading (at 100 kHz)


• Common-Mode Rejection Ratio: > 60 dB at 50/60 Hz; > 40 dB at 100 kHz; > 20 dB at 20 MHz


• Input Voltage Range (Differential): 1000 V CAT III (100:1); 2000 V CAT II (1000:1)


• Maximum Common-Mode Voltage: 2000 V CAT III


• Input Impedance: 10 MΩ || 6 pF (differential and common-mode)


• Offset Voltage: ±100 V


• Offset Voltage Temperature Drift: ±0.1 mV/°C


• Propagation Delay: 50 ns (typical)


• Rise Time: 17.5 ns (typical)


• Noise: < 1 mV RMS (typical, at 100:1 attenuation, 20 MHz bandwidth)


• Output Impedance: 50 Ω


• Power Consumption: < 4.5 VA

Key Features

• Dual attenuation modes for flexible measurement ranges


• High CMRR performance across DC through 20 MHz


• Low output impedance (50 Ω) for clean oscilloscope integration


• Temperature-stable offset voltage specification


• Screw terminal inputs with safety covers

Typical Applications

• Power electronics testing and characterization


• Automotive high-voltage circuit analysis


• Industrial signal acquisition in high common-mode environments


• Gate-drive and switching node measurements

Compatibility & Integration The N2798A interfaces with oscilloscopes via standard BNC connectors and draws power directly from the instrument. It operates with Agilent/Keysight oscilloscopes and other platforms supporting equivalent BNC signal inputs and power delivery schemes.