Agilent
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The Agilent E 4991 A Impedance Analyzer is an RF impedance/material analyzer. The Agilent E 4991 A Impedance Analyzer measures from 1 MHz to 3 GHz. The Agilent E 4991 A Impedance Analyzer uses a 7 mm connector at the test head.[1][2][3]
The Agilent E4991A is a radio-frequency impedance and material analyzer used for electrical characterization of components and materials.[1][3]
The E4991A measures impedance and material parameters over a frequency range from 1 MHz to 3 GHz, and the product family includes an internal DC bias option and a material measurement firmware option.[1][2]
The E4991A uses an RF I-V measurement approach, and the instrument supports open, short, load, and low-loss capacitor calibration as well as fixture compensation at the test plane.[3][2]
The E4991A supports swept measurements, equivalent-circuit analysis, and internal programming through VBA, and the user interface includes a Windows-based graphical interface with trace display and marker functions.[3][1]
The E4991A is used for surface-mount device measurements and for dielectric and magnetic material measurements.[1][3]
The E4991A is applied to passive components such as chip capacitors, RF inductors, ferrite beads, resistors, and varactor diodes, and it is also used for permittivity and permeability evaluation of plastics, ceramics, printed circuit boards, ferrite, and amorphous materials.[3][1]
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Yes, with option E4991A-002 the instrument can measure dielectric permittivity and magnetic permeability parameters up to 1 GHz. The material measurement firmware supports permittivity and loss tangent measurements using the 16453A dielectric test fixture and permeability and loss tangent using the 16454A magnetic test fixture.[1][3]
The following facts about the E 4991 A Impedance Analyzer are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the E 4991 A Impedance Analyzer are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the E 4991 A Impedance Analyzer are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the E 4991 A Impedance Analyzer are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the E 4991 A Impedance Analyzer are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the E 4991 A Impedance Analyzer is not on record.
Answerable by: an OEM datasheet or a fab qualification report
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Last updated Oct 7, 2026.
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