Agilent/Keysight 4195A

The Agilent/Keysight 4195A is a dual-function vector network analyzer and spectrum analyzer operating from 10 Hz to 500 MHz. It delivers simultaneous network and spectral characterization in a single instrument, making it suitable for component and circuit validation across audio, baseband, HF, VHF, and IF applications.

Technical Specifications

• Frequency range: 10 Hz to 500 MHz


• Source power: –50 dBm to +15 dBm with 0.1 dB resolution


• Two outputs with selectable sweep modes (linear, log, CW, program, partial)


• DC bias capability: ±40 V, 10 mV resolution


• Four 50 Ω receiver inputs


• Magnitude ratio dynamic range: > 100 dB; resolution 0.001 dB; accuracy ±0.05 dB (–70 to –30 dBm test input, –30 dBm reference input)


• Phase measurement: ±180° range, 0.01° resolution, ±0.3° accuracy (–70 to –30 dBm)


• Delay measurement: 10 ps to 500 s range; 10 ps resolution at 3.6 MHz aperture


• Calibration modes: normalization, 1-port partial, 1-port full, and port extension Spectrum Analysis


• Frequency range: 10 Hz to 500 MHz


• Resolution bandwidth: 3 Hz to 300 kHz (1-3-10 steps)


• Amplitude range: –135 dBm to +20 dBm


• Amplitude accuracy: ±1.0 dB at 50 MHz


• Average noise level: typically –140 dBm at 10 Hz RBW, ≥2 MHz


• Second harmonic distortion: ≤ –70 dBc at ≥2 MHz


• Third-order intercept distortion: ≤ –80 dBc at ≥2 MHz


• Frequency response: ±1.5 dB


• Sweep time: approximately 500 ms/span to 1800 s/span; 3.5 s typical at 500 MHz span, 300 kHz RBW

Key Features

• Color CRT display for multi-trace differentiation


• Softkey operation and marker functions


• User-programmable functions with 3.5-inch disk drive storage


• Frequency resolution to 1 mHz


• Multiple sweep modes and manual control

Typical Applications Component characterization, impedance measurement, filter analysis, amplifier validation, and spectral content assessment in research, development, and manufacturing environments.

Compatibility & Integration The 4195A accepts external programming and supports user-defined measurements through internal function libraries.