Keysight
E 4990 A Impedance Analyzer
Provisional entry — research in progress
This page was generated automatically from cited public sources and hasn't completed the full research pass yet. Every specification shown carries its source; more detail is added as research completes.
What it is
What do the numbers mean?
Where are the manuals?
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
Not publicly documented
Field notes
No research found yet — worked with this tool? Share what you know.
Frequently asked questions
What does an impedance analyzer measure?General reference — not yet source-verified
An impedance analyzer measures the complex impedance (resistance and reactance) of a device under test (DUT) over a specific frequency range, providing parameters such as capacitance, inductance, and dissipation factor.
How does an impedance analyzer differ from an LCR meter?General reference — not yet source-verified
While both measure impedance, an impedance analyzer typically offers a wider frequency sweep and higher accuracy in characterizing components' frequency-dependent behavior, making it suitable for more detailed material and device analysis.
What types of components are commonly tested with this class of instrument?General reference — not yet source-verified
Common DUTs include capacitors, inductors, resistors, semiconductors, sensors, and dielectric materials, especially when their properties must be evaluated across multiple frequencies.
Is the instrument suitable for production line testing?General reference — not yet source-verified
Yes, impedance analyzers of this class are often used in both R&D and production metrology for quality control and incoming inspection, but their primary strength lies in high-accuracy benchtop characterization.
What accessories or fixtures are typically used with such analyzers?General reference — not yet source-verified
Test fixtures, cables, and calibration standards are commonly used to connect the DUT to the analyzer and ensure accurate measurements, especially for different component form factors or temperature-dependent testing.
Not publicly documented
The following facts about the E 4990 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.
Fewer than 3 independently cited specifications for the E 4990 A Impedance Analyzer are on record; the remainder await public documentation.
Answerable by: an OEM datasheet, a cleanroom equipment inventory, or an engineer who operated or installed it
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the E 4990 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 4990 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 4990 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 4990 A Impedance Analyzer are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
No research found yet — worked with this tool? Share what you know.
Sources & citations
Sources (7)Every fact above is drawn from these public sources
- [1]Inventory photo
- [2]Equipment inventory listing
- [3]Equipment inventory listing
- [4]Inventory photo
- [5]Inventory photo
- [6]Inventory photo
- [7]Inventory photo
Last updated Oct 2, 2026.
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