Keysight
4284 A Precision LCR Meter
The Keysight 4284 A Precision LCR Meter is a precision LCR meter. The Keysight 4284 A Precision LCR Meter has a 20 Hz to 1 MHz test frequency range. The Keysight 4284 A Precision LCR Meter includes GPIB interface support.[1][2]
What it is
The Keysight/Agilent 4284A is a precision LCR meter. The 4284A offers a test frequency range from 20 Hz to 1 MHz. The basic accuracy is 0.05% with 6-digit resolution. The instrument includes a GPIB interface. Options include an internal power amplifier and DC bias (Option 001), a bias current interface (Option 002), and cable length operation for 2 m/4 m (Option 006). Power requirements are 100, 120, 220, or 240 VAC at 47-66 Hz. Weight is 33 lb; dimensions are 177 mm high by 426 mm wide by 498 mm deep.[1][3]
How it works
General reference — not yet source-verifiedLCR meters operate by applying an AC test voltage at a selected frequency and measuring the resulting current and phase angle to calculate impedance components. The instrument selects the appropriate measurement range and corrects for parasitic effects using calibration data.
Applications
General reference — not yet source-verifiedTypical tested devices include capacitors, inductors, resistors, transformers, and other passive components. The instrument is also suitable for materials characterization where impedance measurements are required.
What do the numbers mean?
Power & electrical9
- Voltage Selector Positions:[3]
Optics & imaging1
Performance2
Control & software2
Dimensions & facilities1
Configuration & options8
Vintage & configurations
Documented models & variants
| Designation | Generation | Vintage | Changes | Source |
|---|---|---|---|---|
| 4284A 001 | — | — | Adds Power Amplifier/Internal DC Bias option. | bellnw.com[1] |
| 4284A 001 002 | — | — | Adds Power Amplifier/Internal DC Bias and Bias Current Interface options. | bellnw.com[1] |
| 4284A 006 | — | — | Adds 2 m/4 m Cable Length Operation. | bellnw.com[1] |
| 4284A 001 006 | — | — | Adds Internal Power Amplifier/DC Bias and 2 m/4 m Cable Length Operation. | bellnw.com[1] |
What does it need to run?
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
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
How does the instrument ensure accurate measurements?General reference — not yet source-verified
Accuracy is ensured through four-terminal Kelvin connections to eliminate lead resistance, open/short calibration to correct for parasitic effects, and load calibration to account for fixture characteristics. The instrument also offers averaging and selectable integration times.
What frequency range is available on such precision LCR meters?General reference — not yet source-verified
Precision LCR meters typically offer a range of discrete test frequencies from low kilohertz up to several megahertz, allowing characterization of components across their intended operating conditions.
Can this instrument measure components in-circuit?General reference — not yet source-verified
Generally no—these meters are designed for isolated component measurements. In-circuit measurements would be affected by parallel impedances from other circuit elements, reducing accuracy.
What accessories are commonly used with LCR meters?General reference — not yet source-verified
Common accessories include fixture adapters for different package types (axial, radial, SMD), temperature chambers for environmental testing, and measurement cables with Kelvin clips or tweezers.
Not publicly documented
The following facts about the 4284 A Precision LCR Meter 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 4284 A Precision LCR Meter are on record.
Answerable by: OEM historical records or a trade-press announcement
The control-system platform and OS era of the 4284 A Precision LCR Meter 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 4284 A Precision LCR Meter are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 4284 A Precision LCR Meter is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 4284 A Precision LCR Meter are on record.
Answerable by: an OEM parts catalog or a service engineer
No research found yet — worked with this tool? Share what you know.
Sources & citations
Sources (5)Every fact above is drawn from these public sources
- [1]bellnw.com — bellnw.combellnw.com
- [2]Agilent / HP 4284A Precision LCR Meter, 20 Hz to 1 MHz, Refurbished — testequipmentdepot.comtestequipmentdepot.com
- [3]Inventory photo
- [4]4284A Precision LCR Meter Operation Manual | Keysight — keysight.comkeysight.com
- [5]4284A Precision LCR Meter Service Manual | Keysight — keysight.comkeysight.com
Last updated Sep 29, 2026.
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