Agilent/Keysight 1131B

The Keysight 1131B is an InfiniiMax Series probe amplifier delivering high-fidelity signal acquisition for electronic testing and design validation. This active probe amplifier minimizes loading on the Device Under Test while maintaining superior signal integrity across high-speed differential and single-ended measurements. As the RoHS compliant successor to the 1131A, It has direct form, fit, and function compatibility with Infiniium oscilloscopes in the 2.5 to 3 GHz range.

Technical Specifications

• Probe Bandwidth: 3.5 GHz


• System Bandwidth: 1 GHz (with 1 GHz oscilloscopes)


• Attenuation Ratio: 10:1 / 5:1 selectable


• Dynamic Range: ±2.5 V


• DC Offset Range: ±12 V (with probe offset)


• Maximum Input Voltage: ±30 V


• Input Impedance (Differential): 50 kΩ resistance, 0.27–0.34 pF capacitance


• Input Impedance (Single-Ended): 25 kΩ resistance, 0.44–0.67 pF capacitance

Key Features

• Patented resistor probe tip technology for low DUT loading


• Flat frequency response and minimal input capacitance for accurate signal fidelity


• AutoProbe Interface enables automatic configuration, attenuation control, and DC power delivery to probe circuitry


• RoHS compliant design

Typical Applications High-speed differential and single-ended probing on Infiniium oscilloscopes supporting active probe interfaces. Suitable for signal integrity analysis and precision measurements in the 1 to 3.5 GHz bandwidth range.

Compatibility & Integration Designed for Infiniium 2.5 to 3 GHz oscilloscopes with AutoProbe Interface support. Requires one or more probe heads or connectivity kits (such as E2669B or E2668B) to form a complete probing system. The InfiniiMax 1130B-34B Series supports extensive probe head and accessory options.