The HP/Agilent 4191A RF Impedance Analyzer is a precision instrument for measuring impedance parameters across the MF to UHF spectrum. Operating from 1 MHz to 1000 MHz, it delivers 1% basic accuracy on impedance elements and characterizes resistance, reactance, inductance, capacitance, quality factor, dissipation factor, and reflection coefficients. The analyzer supports both spot frequency and swept measurements with automatic, manual, linear, and logarithmic sweep modes.
Technical Specifications
Frequency Coverage & Resolution
• 1 MHz to 1000 MHz with ±3 ppm accuracy
• Standard resolution: 100 kHz (1–500 MHz), 200 kHz (500–1000 MHz)
• Optional resolution: 100 Hz (1–500 MHz), 200 Hz (500–1000 MHz)
Measurement Parameters
• Impedance (|Z|): 1 mΩ to 100 kΩ
• Resistance (R): 100 mΩ to 20 kΩ
• Reactance (X), Conductance (G), Susceptance (B)
• Inductance (L): 0.1 nH to 5 mH
• Capacitance (C): 0.1 pF to 1 µF
• Dissipation Factor (D) / Quality Factor (Q): 0.001 to 1000
• Admittance (|Y|): 100 µS to 10 S
• Reflection Coefficient (|Γ|): 0.0000 to ±1.0000
• Display resolution: 4½ digits maximum (19,999 counts)
Test Signal
• Level: −20 ±3 dBm into 50 Ω
DC Bias Capability
• Voltage range: 0 V to ±40 V with 10 mV minimum steps
• Setting accuracy: 0.1% of setting +10 mV
• Output impedance: 3900 ±10% at 7.2 mA max; input impedance: 3900 ±10% at 100 mA max
• Linear and logarithmic voltage sweep modes supported
– Key Features
• Automatic calibration using reference terminations (0 Ω, 50 Ω, ∞ Ω) with cubic interpolation
• 51 selectable calibration frequencies or user-programmed start/stop frequencies
• Continuous memory preserves calibration data
• Internal self-test with diagnostic codes
• Manual or remote DC bias control
– Typical Applications
Research and development, quality control, and production testing of electronic components and circuits requiring detailed impedance characterization.
– Interfaces
HP-IB (IEEE-488) connectivity for remote control and data transfer.
