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Complex material test and device characterization
Keysight ZA5-class impedance analyzers include the E4990A Series. They extend beyond general-purpose LCR measurements to provide deeper insights into demanding applications like equivalent circuit modeling, high-frequency characterization, and materials validation. Compared to our benchtop and handheld LCR meters, our impedance analyzers deliver extended analysis functions and flexible biasing, ideal for analyzing complex materials and performing device characterization. Choose one of our popular configurations or configure one specific for your application. Need help selecting? Check out the resources below.
Enhanced data analysis
Features like equivalent circuit modeling, parameter extraction, and limit line testing enable precise characterization and in-depth analysis of complex components and materials.
Material validation
Built-in permittivity, permeability, and loss tangent measurements for precise high-frequency impedance analysis, making it ideal for characterizing materials.
Integrated DC bias source
Provides stable DC bias up to ±40 V and ±100 mA, accurately replicating dynamic real-world electrical conditions for thorough component testing.
Enhanced graphical tools
Intuitive, 10.4-inch color touchscreen with multitrace views, marker functions, limit testing, and equivalent circuit analysis, enabling detailed impedance evaluation.
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Maximum frequency
120 MHz to 3 GHz
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Target DUT
General-purpose device, Material
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Type
Impedance Analyzer
Most popular configurations
ZA5-class Impedance Analyzer
ZA5-class Impedance Analyzer
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Frequently asked questions
An impedance analyzer is used to measure the electrical impedance of components, circuits, or materials across a broad frequency spectrum. Unlike LCR meters that operate at fixed frequencies, impedance analyzers can perform frequency sweeps, ranging from millihertz to gigahertz, to capture how a device's impedance, phase, and related parameters change with frequency.
Impedance analyzers are crucial in electrochemical and dielectric analysis, helping researchers evaluate the behavior of materials used in batteries, sensors, coatings, and biomedical devices. In RF and high-speed digital applications, they help ensure proper impedance matching, which is key to minimizing signal loss and reflection.
A network analyzer can be used to measure impedance, particularly at high frequencies, by converting reflection measurements (S11) into impedance values. This is commonly done in RF and microwave applications where you're analyzing antennas, filters, or transmission lines, and where signal behavior is best understood in terms of S-parameters. If you're already set up for network analysis and need impedance as part of broader signal integrity or matching work, a VNA can be a convenient and effective solution.
However, an impedance analyzer is the better tool when you need high-accuracy impedance measurements. It’s purpose-built for testing passive components like capacitors, inductors, and resistors, as well as for analyzing materials and electrochemical systems. Impedance analyzers provide direct measurements of parameters and include compensation functions (open/short/load) to improve accuracy by eliminating fixture-related errors.
Impedance measurement data helps you design circuits and systems that require specific resistance, capacitance, and inductance values to perform optimally. To maximize power transfer and minimize reflections in radio frequency (RF) devices, you need to match each component in the RF chain's impedance.
Impedance measurement is important because it provides a comprehensive view of how electrical components behave in real-world conditions, especially in AC or high-frequency applications. Unlike resistance alone, impedance captures how a device responds across different frequencies, which is critical for designing and troubleshooting circuits in RF, audio, power electronics, communications, and material testing. For example, impedance affects signal reflection in transmission lines, resonance in filters and oscillators, and efficiency in power delivery systems.