# Keysight 4285A Precision LCR Meter (Pre-Owned)

# Keysight 4285A Precision LCR Meter (Pre-Owned)

## Key Features At A Glance

-   Test frequency range from 75 kHz to 30 MHz with 100 Hz resolution and ±0.01% frequency accuracy
-   Measures impedance, admittance, inductance, capacitance, resistance, conductance, dissipation factor, quality factor, reactance, susceptance, and phase angle
-   Four-terminal pair measurement configuration with selectable 0 m, 1 m, or 2 m test cable length
-   Programmable test signal: 5 mVrms to 2 Vrms voltage and 200 µArms to 20 mArms current with ALC constant-level mode
-   Ten-bin comparator with sequential and tolerance sorting modes plus list sweep of up to ten frequencies or signal levels
-   GPIB interface (IEEE-488.1 and 488.2 compliant) with SCPI/TMSL programming for automated test integration
-   Optional internal DC bias (Option 001) provides ±0.000 to ±40.00 V bias with up to 100 mA bias current
-   Six-digit LCD dot-matrix display with maximum count of 999999 for high-resolution readback

The Keysight 4285A Precision LCR Meter is a benchtop impedance measurement instrument that characterizes passive components and materials across a 75 kHz to 30 MHz test signal range. It measures the full set of impedance parameters — |Z|, |Y|, L, C, R, G, D, Q, Rs, Rp, X, B, and phase angle — under user-programmable test signal and equivalent-circuit conditions, with both series and parallel measurement models available. The instrument uses a four-terminal pair connection at the UNKNOWN terminals and supports selectable test cable lengths of 0 m, 1 m, or 2 m with corresponding cable correction.

The 4285A is built for component characterization, incoming inspection, and production component sorting where the device under test must be measured across a defined frequency range with controlled signal level. Its ten-bin comparator function supports both sequential (unnested) and tolerance (nested) sorting modes with absolute or percent limits for the primary parameter and IN/OUT decision output for the secondary parameter. A list sweep function programs up to ten frequencies or test signal levels — and DC bias voltages when Option 001 is installed — for sequenced or single-point measurements. With Option 002 the instrument can also control the Keysight 42841A bias current source or the 42851A precision Q adapter for extended application coverage.

ValueTronics International, LLC stocks, tests, and ships precision LCR and impedance instruments from its 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois. Every unit moves through our in-house inspection and performance verification process before it leaves the facility, and our team can package the instrument with the test fixtures, leads, and adapters needed for its intended application rather than asking the buyer to source those pieces separately. That single-source capability — instrument, fixtures, and condition documentation arriving together — is what separates a verified professional purchase from a marketplace listing.

## Brand Heritage

Keysight Technologies inherits the test and measurement instrument lineage of Hewlett-Packard. HP spun off its test and measurement business as Agilent Technologies in 1999, and Agilent further separated its electronic measurement division as Keysight Technologies in 2014. Instruments originally introduced under the HP or Agilent brand — including precision LCR meters in the 428x family — are part of this continuous engineering and product-support lineage.

## Accessories Supplied

-   Power cord (depends on the country where the 4285A is being used)
-   100 Ω resistor box (Keysight P/N 04285-61001)
-   BNC female-female Adapter (Keysight P/N 1250-0080, 4 ea.)
-   Fuse, only for Option 4285A-201 (Keysight P/N 2110-0046, 2 ea.)

## Product Core & Specifications

Specification

Value

Measurement Functions

Measurement parameters

|Z|, |Y|, L, C, R, G, D, Q, Rs, Rp, X, B, φ

Mathematical functions

Deviation and percent of deviation of measurement values from a programmable reference value

Equivalent measurement circuit

Parallel and series

Ranging

Auto and manual (hold/up/down)

Trigger

Internal, external, BUS (GPIB), and manual

Delay time

0 to 60.000 s in 1 ms steps

Measurement terminals

Four-terminal pair

Test cable length

0 m, 1 m, and 2 m selectable

Integration time

Short, medium, and long selectable

Averaging

1 to 256, programmable

Test Signal

Frequency

75 kHz to 30 MHz, 100 Hz resolution

Frequency accuracy

±0.01%

Signal modes

Normal and Constant

Voltage level (Normal)

5 mVrms to 2 Vrms

Voltage level (Constant, ALC ON)

10 mVrms to 1 Vrms

Current level (Normal)

200 µArms to 20 mArms

Current level (Constant, ALC ON)

100 µArms to 20 mArms

Display Range

|Z|, R, X

0.00001 Ω to 99.9999 MΩ

|Y|, G, B

0.00001 µS to 99.9999 S

C

0.00001 pF to 999.999 µF

L

0.001 nH to 99.9999 H

D

0.000001 to 9.99999

Q

0.01 to 99999.9

θ

−180.000° to 180.000°

Δ

−999.999% to 999.999%

Correction Functions

Zero open

Eliminates measurement errors due to parasitic stray admittance (C, G) of the test fixture

Zero short

Eliminates measurement errors due to parasitic residual impedances (L, R) of the test fixture

Load

Improves measurement accuracy using a working standard as reference

List Sweep

List sweep points

Maximum of ten frequencies or test signal levels

Comparator Function

Primary parameter sorting

Ten-bin sorting

Secondary parameter

IN/OUT decision output

Sorting modes

Sequential mode and Tolerance mode

Bin count

0 to 999999

Interface

GPIB

IEEE-488.1 and 488.2 compliant; ASCII and 64-bit binary data format

GPIB buffer memory

Up to 128 measurements

Programming language

Test and Measurement Systems Language (TMSL)

GPIB interface functions

SH1, AH1, T5, L4, SR1, RL1, DC1, DT1, C0, E1

Power Requirements

Line voltage

100, 120, 220 Vac ±10%, 240 Vac +5% −10%

Line frequency

47 to 66 Hz

Power consumption

200 VA max.

Operating Environment

Temperature

0 °C to 55 °C

Humidity

≤ 95% R.H. at 40 °C

Physical

Dimensions

426 (W) x 177 (H) x 498 (D) mm

Weight

Approximately 16 kg (35.3 lb., standard)

Display

LCD dot-matrix display

Number of display digits

6-digits, maximum display count 999999

Supplemental Performance Characteristics

Stability |Z|, |Y|, L, C, R (≤ 1 MHz)

< 0.01%/day

Stability |Z|, |Y|, L, C, R (30 MHz)

< 0.05%/day

Stability D (≤ 1 MHz)

< 0.0001/day

Stability D (30 MHz)

< 0.0005/day

Temperature coefficient |Z|, |Y|, L, C, R (≤ 1 MHz)

< 0.004%/°C

Temperature coefficient |Z|, |Y|, L, C, R (30 MHz)

< 0.05%/°C

Settling time (frequency)

< 50 msec.

Settling time (test signal level)

< 100 msec.

Settling time (measurement range)

< 50 msec./range shift

Measurement time (SHORT)

30 ms

Measurement time (MEDIUM)

65 ms

Measurement time (LONG)

200 ms

GPIB data output time

Approx. 10 ms

**Important:** Measurement accuracy specifications apply after ≥30 minutes warm-up and after OPEN, SHORT, and (where applicable) LOAD corrections have been performed. For test frequencies ≥1.001 MHz, the accuracy reference plane is the 1-port terminal of the 16085B Terminal Adapter connected to the UNKNOWN terminals or to the end of the 16048A/16048D test leads.**Important:** Test fixture and test leads are not included as standard furnished accessories. The appropriate test fixture or test lead set (16034E, 16044A, 16047A/D, 16048A/D/G/H, 16334A, 16451B, or other listed fixture) must be selected and ordered separately based on the DUT geometry and frequency range. See Accessories Available.**Important:** Measurement accuracy is specified after OPEN and SHORT corrections have been performed, with appropriate warm-up time (≥ 30 minutes) and CABLE CORRECTION when using 1 m (16048A) or 2 m (16048D) test leads.**Important:** For test frequencies ≥ 1.001 MHz, the Keysight 16085B Terminal Adapter is required at the reference plane for the specified measurement accuracy.Recommended pairing: when extended Q characterization or bias-current operation is required, the 4285A Option 002 interface supports control of the Keysight 42841A Bias Current Source and the 42851A Precision Q Adapter as named in the datasheet's accessories list.

## About this used unit

-   Warranty included
-   Functional verification included
-   Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
-   Note that unnecessary accessories may not be included (contact Test Architect to confirm).

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 0.0 USD
- **Vendor:** Keysight
- **Type:** Lcr Meter
- **Tags:** Agilent, Agilent Keysight, LCR, Manufacturers, Meters & DAQ, product_manual_group_1, Product_used

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 0.00 USD | In stock |
| NIST Traceable with Full Data | 0.00 USD | In stock |
| ISO IEC 17025 Accredited | 0.00 USD | In stock |

## Images

- Keysight 4285A Precision LCR Meter (Pre-Owned)

---

> Source: [ValueTronics](https://valuetronics.com/products/4285a-agilent-lcr-meter-used)
> Updated: 2026-05-30