HP / Agilent 4285A Precision LCR Meter, 75 kHz to 30 MHz

The HP/Agilent 4285A Precision LCR Meter delivers high-accuracy component and material characterization across RF and general-purpose measurement applications. Operating from 75 kHz to 30 MHz with 100 Hz frequency resolution, this benchtop instrument supports 14 measurement parameters including impedance, inductance, capacitance, resistance, quality factor, and dissipation factor. Basic accuracy reaches 0.1% for Z, C, and L measurements, with D accuracy of 0.001.

Technical Specifications

• Impedance: 0.01 mΩ to 99.9999 MΩ


• Capacitance: 0.01 fF to 999.999 µF


• Inductance: 0.001 nH to 99.9999 H


• Admittance: 0.01 nS to 99.9999 S


• Quality Factor (Q): 0.01 to 99999.9


• Phase Angle: −180.000° to 180.000° Signal Generation


• Frequency Range: 75 kHz to 30 MHz at ±0.01% accuracy


• Voltage: 5 mVrms to 2 Vrms (normal mode); 10 mVrms to 1 Vrms (constant mode)


• Current: 200 µArms to 20 mArms (normal); 100 µArms to 20 mArms (constant)


• Measurement Time: 30 ms, 65 ms, or 200 ms per measurement DC Bias


• Internal DC Bias Option: ±(1 mV to 40 V) at ≤100 mA with 0.1% accuracy


• External Bias Current Source Option: 0.01 A to 10 A DC Power & Environment


• Supply: 100/120/220 Vac ±10%, 240 Vac +5%/−10%; 47–66 Hz


• Consumption: 200 VA maximum


• Operating Temperature: 0° to 55°C; Humidity: <95% RH


• Dimensions: 426 mm W × 177 mm H × 498 mm D


• Weight: 16 kg (35.2 lb)

Key Features

• 14 measurement parameters including Rs, Rp, reactance, susceptance, and deviation


• High-speed 30 ms measurement capability for production throughput


• Precision test signal generation with voltage and current mode flexibility


• Optional power amplifier: 5 mVrms to 20 Vrms, 50 µArms to 200 mArms

Compatibility & Integration

• GPIB interface for automated test system integration


• Handler interface options (201/202) for component handler connectivity


• Scanner interface option (301) for multi-point testing