The Wayne Kerr 6425 is a precision impedance analyzer delivering accurate measurement of impedance parameters across electronic components and materials. It characterizes capacitance, inductance, resistance, dissipation factor, quality factor, and reactance in research, quality control, and production environments.
Technical Specifications
Measurement Parameters
• Primary: L, C, R, Z, Y, Phase Angle (θ), D (Dissipation Factor), Q (Quality Factor), G (Conductance), B (Susceptance), X (Reactance)
• Equivalent circuit representation: series and parallel configurations
• Frequency range: 42 discrete frequencies from 20 Hz to 300 kHz
• Frequency accuracy: ±0.01%
• Basic accuracy: 0.05% at 1 kHz (Capacitance 20 pF to 1800 µF); doubles for Fast Speed measurements
Drive and Measurement Control
• AC drive level: 10 mV to 5 V or 1 mA to 100 mA, automatically selected by impedance range
• Restricted voltage drive at 300 kHz: maximum 3 V
• Automatic voltage/current drive selection
• DC bias: integral bias programmable to 20 V; external bias to 50 V at 1 A maximum
Measurement Timing
• Normal Speed: ~400 ms above 300 Hz; ~600 ms at 20 Hz; 750 ms at ≥100 kHz
• Fast Speed: ~125 ms above 300 Hz, scaling to ~600 ms at 20 Hz (with doubled accuracy specifications)
User Interface and Control
• Display: 7-inch (18 cm) CRT with numerical and graphical output; automatic digit adjustment up to six digits
• Microprocessor-controlled with soft-key selection of measurement functions and conditions
• Non-volatile memory for functions, trim values, limits, and binning data
• Keyboard lockout protection
Connections and Calibration
• Four BNC connectors supporting 2, 3, and 4-terminal measurement configurations; screens at ground potential
• Auto-Trim function compensates residual series impedance
– Key Features
• Selectable series and parallel equivalent circuit analysis
• Programmable internal DC bias to 20 V for electrolytic capacitor testing
• External bias capability to 50 V
• Discrete 42-frequency test set from 20 Hz to 300 kHz
• Fast and Normal measurement speed modes
• Graphical and numerical display on 7-inch CRT
– Typical Applications
Component characterization in R&D, incoming inspection, process control, and manufacturing environments requiring multi-parameter impedance analysis at fixed frequencies.
