Keysight (Agilent) E4990A

The Keysight (Agilent) E4990A is a precision impedance analyzer designed for accurate characterization of electronic components and materials across a broad frequency spectrum. It delivers impedance, admittance, reflection coefficient, and insertion loss measurements with ±0.08% basic accuracy, supported by open/short/load compensation. The instrument operates from 100 kHz to 120 MHz and measures impedance values from 1 mΩ to 1 GΩ, making it suitable for R&D, quality control, and manufacturing environments requiring detailed component behavior analysis.

– Technical Specifications

• Frequency range: 100 kHz to 120 MHz
• Impedance measurement range: 1 mΩ to 1 GΩ
• Admittance measurement range: 1 nS to 1000 S
• Basic impedance accuracy: ±0.08%
• Measurement speed: Up to 5 ms/point at 120 MHz
• Signal source level: 5 mVrms to 1.0 Vrms (60 dB range), adjustable in 10 mVrms steps
• DC bias voltage: 0 V to ±40 V (optional)
• Four-terminal pair, two-terminal, and shunt-through measurement configurations
• Operating temperature: 0 °C to 40 °C
• Operating humidity: 20% to 80% RH (non-condensing)
• Power supply: 100–240 VAC, 50/60 Hz; <400 VA consumption

– Key Features

• Measures impedance (Z), admittance (Y), phase angle (θ), reflection coefficient (Γ), and return/insertion loss
• High-resolution color LCD with multiple display formats: Log Magnitude, Real, Imaginary, Smith Chart, Nyquist, Bode
• List sweep mode for rapid data acquisition
• Equivalent circuit analysis, curve fitting, and limit testing functions
• Internal memory and USB external storage

– Connectivity

• GPIB, LAN, USB, and handler interfaces for automation and remote control
• External trigger input/output

– Typical Applications

• Component characterization and validation
• Material property measurement
• Production quality control
• Temperature-dependent impedance testing with optional chambers