Agilent/Keysight 16451B

The Keysight 16451B is a dielectric test fixture for measuring the dielectric constant and dissipation factor of solid dielectric materials in compliance with ASTM D150. Operating on the parallel plate method, it forms a capacitor by sandwiching the test material between two electrodes and incorporates a guard electrode to suppress fringe capacitance effects. The fixture connects to LCR meters and impedance analyzers via 4-terminal pair BNC connectors and operates from DC to 30 MHz.

Four interchangeable electrode sets

A, B, C, and D - accommodate flat, smooth, rough, or extremely thin materials across sample diameters from 10 mm to 56 mm and thicknesses up to 10 mm. The 16451B withstands ±42 V peak maximum (AC + DC) and functions in ambient temperatures from 0 °C to 55 °C at humidity levels up to 95% RH at 40 °C. Complete with multiple electrode configurations, attachment for error compensation, and carrying case, this fixture delivers accurate characterization of dielectric properties across wide material variety and frequency spans.

Technical Specifications

• Frequency Range: DC to 30 MHz


• Maximum Voltage: ±42 V peak (AC + DC combined)


• Connector Type: 4-Terminal Pair, BNC


• Operating Temperature: 0 °C to 55 °C


• Operating Humidity: ≤95% RH at 40 °C


• Cable Length: Approximately 0.8 m


• Weight: Approximately 3.7 kg including accessories

Key Features

• Guard electrode design minimizes stray capacitance at electrode edges


• Four electrode sets for diverse material types and geometries


• Electrode A (38 mm diameter) for flat, smooth materials; sample diameter 40–56 mm


• Electrode B (5 mm diameter) for flat, smooth materials; sample diameter 40–56 mm


• Electrodes C and D for rough or extremely thin materials; sample diameter 10–56 mm


• Thin film electrode options for sample diameters up to 50 mm (Electrode C) and 14 mm (Electrode D)


• All sample types limited to thickness ≤10 mm


• Includes error compensation attachment and hex key for electrode replacement

Typical Applications

• Characterization of polymer films and sheets


• Evaluation of ceramic and composite dielectric properties


• Quality control testing of insulating materials


• Research and development of advanced dielectric systems

Compatibility & Integration Works with LCR meters and impedance analyzers supporting 4-terminal pair measurement configuration. Compatible with Keysight 4194A and 4294A impedance analyzers.