The Keysight 4191A RF Impedance Analyzer measures impedance and related parameters across 1 MHz to 1 GHz with 1% basic accuracy. It delivers spot and swept measurements of impedance, admittance, resistance, reactance, inductance, capacitance, quality factor, and phase angle. The instrument combines fast measurement speed—250 ms in high-speed mode, 800 ms in normal mode—with flexible bias control and direct engineering parameter display.
Technical Specifications
Frequency and Resolution
• Operating range: 1 MHz to 1 GHz
• Frequency resolution: 100 Hz to 500 MHz or 200 Hz to 1000 MHz (Option 002)
• Frequency accuracy: 3 ppm (Option 002)
• Display resolution: 4 ½ digits maximum
Measurement Parameters and Ranges
• Impedance |Z| and Resistance R: 100 mΩ to 20 kΩ
• Admittance |Y|: 100 µS to 10 S
• Conductance G: 20 µS to 10 S
• Inductance L: 0.1 nH to 5 mH
• Capacitance C: 0.1 pF to 1 µF
• Reactance X: 100 mΩ to 20 kΩ
• Dissipation Factor D and Quality Factor Q: 0.001 to 1000
• Reflection Coefficient: 0.0000 to ±1.0000
• Phase Angle: ±0.01° to 180.00°
Measurement Speed
• Normal mode (running average): ~800 ms
• High-speed mode (instantaneous): ~250 ms
DC Bias
• Internal: ±40 V in 10 mV steps with auto-sweep function
• External: ±40 V maximum, 100 mA maximum input current
– Key Features
• Basic accuracy of 1% across many impedance elements
• Dual measurement modes for flexibility between speed and averaging
• Internal and external bias capability for component characterization under load
• IEEE-STD-488 (HP-IB) control and data transfer
• Optional analog voltage outputs for X-Y recorder interface (Option 004)
– Typical Applications
• RF component characterization and quality assurance
• Electronic material impedance profiling
• R&D circuit validation across MHz to GHz frequencies
• Systems integration validation
– Compatibility & Integration
HP-IB interface enables remote control and automated measurement sequences. Optional analog output channels support direct graphical recording. Operating temperature range 0°C to 55°C; power requirement 100/120/220/240 VAC, 48–66 Hz, 150 VA maximum. Dimensions: 425.5 mm × 230 mm × 574 mm; weight approximately 24 kg.
