HP / Agilent 4275A LCR METER

The HP/Agilent 4275A is a precision microprocessor-based LCR meter for accurate impedance characterization across 10 kHz to 10 MHz. It measures inductance, capacitance, resistance, impedance, dissipation factor, quality factor, ESR, conductance, susceptance, reactance, and phase angle with 0.1% basic accuracy and 5½ digit resolution. The instrument supports auto, series, and parallel measurement modes with continuously variable test signal levels from 1 mVrms to 1 Vrms.

Typical measurement time is 140–180 ms above 1 kHz. A four-terminal pair configuration with guard terminal minimizes lead and fixture effects. Automatic zero-offset capability compensates for residual impedance.

Deviation measurement displays absolute or percentage difference from stored reference values.

Technical Specifications

• Measurement Parameters: L, C, R, |Z|, D, Q, ESR, G, X, B, and phase angle


• Frequency Range: 10 kHz to 10 MHz with 10 or 12 selectable spot frequencies in 1-2-4-10 sequence. Optional frequencies: 455 kHz and 10.7 MHz


• Test Signal Level: 1 mVrms to 1 Vrms continuously variable across 3 ranges


• Basic Accuracy: 0.1%


• Resolution: 5½ digits for primary parameters; 0.00001 for dissipation factor (D)


• Measurement Modes: Auto, Series, Parallel with supported parameter combinations


• Range Modes: Auto and manual


• Measurement Speed: 140–180 ms typical above 1 kHz; high resolution mode extends time


• Inductance (L): 100 nH to 10 H


• Capacitance (C): 1 pF to 100 µF


• Resistance (R), |Z|, ESR, Reactance (X): 1 Ω to 10 MΩ


• Conductance (G), Susceptance (B): 1 µS to 10 S


• Dissipation Factor (D): 0.00001 to 9.9999


• Quality Factor (Q): 0.01 to 9900


• Phase Angle: 0 to ±180°

Key Features

• Four-terminal pair configuration with guard terminal for enhanced accuracy


• Automatic zero-offset to eliminate test lead and fixture residuals


• Deviation measurement capability (absolute and percentage modes)


• DC bias options: 0 to ±35 V (Option 001, 1 mV resolution) or 0 to ±99.9 V (Option 002, 100 mV resolution)


• External bias support up to ±200 V


• Compatible with HP 16047A Direct Coupled Test Fixture

Compatibility & Integration HP-IB (IEEE-488) standard interface enables integration into automated test systems and remote control via HP-IB or optional 16023B Bias Controller.