Hewlett Packard 4195A
500MHz Network/Spectrum Analyzer, Refurbished

• Linear and non-linear device 
  measurement and analysis
• High accuracy and resolution
• User functions
• Color graphics, graphics analysis 
  and direct copy capability
• Direct save/recall with internal disc drive

The 4195A is a high performance, cost effective and intelligent analyzer with combined vector network and spectrum analysis capabilities.  The frequency is covered from 10Hz throughout 500MHz with an excellent 0.001Hz resolution for audio, baseband, HF, VHF and IF applications.  It directly measures amplitude ratio, phase, group delay and spectrum level needed for characterizing linear/non-linear analog circuits or components used in communications, telecommunications, consumer electronics and other equipment.

The 4195A's excellent accuracy and resolution meets the severe measurement requirements for developing advanced equipment.  A color display allows you to readily differentiate between multiple traces.  Convenient softkey operation and marker functions make deriving device parameters quick and easy.  Measurement results can be directly copied to printer or plotter without an external computer.  Furthermore, the 4195A has internal user functions for computing and self controlling capability.  User program, User Defined Function and User Math allows you to quickly customize the setups most suited to your application without using an external computer.  A built-in 3.5 inch disc drive can save the instrument state, data and user functions.

• Combined Vector Network and Spectrum Analysis
• High Accuracy and Resolution Measurement

• User Functions for Easy Customized Operation
• Advanced Marker Action on Color Graphics

Network analyzers and spectrum analyzers have become essential tools for evaluating subsystems or components used in electronic equipment.  Especially, the importance of phase and group delay measurements is rapidly increasing.  The 4195A offers full network and spectrum analysis from 10Hz to 500MHz at half the price.  It has very wide applications.  Network analysis functions include characterizing the gain/group delay ripple of filters and amplifiers.  Spectrum analysis functions include the harmonic, intermodulation distortion of amplifiers or IF subsystems in communications and telecommunications.  S-parameters can also be measured by using 2 transmission/reflection test sets, without changing direction of the device.

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The 4195A measures amplitude ratio and phase with an accuracy of ±0.05dB/ ±0.3 deg and a  resolution of 0.001dB/0.01 deg.  The amplitude and phase distortion of transmission devices, such as filters, amplifiers, delay lines and cables, affect the quality of information and create bit errors in PSK or QAM systems.  The 4195A can evaluate distortion with high accuracy and resolution.  For accuracy enhancement, 1 Port Full Cal, 1 Port Partial Cal, Normalization and Port Extension capabilities are available.  For spectrum analysis, high level accuracy of ±0.1dB and fully synthesized local OSC allow you to obtain stable and reliable C/N, harmonic distortion or intermodulation distortion measurements.  In addition the high speed shaped digital IF filter technique makes discrimination of closely spaced signals easy, so 50/60 Hz power-line sidebands can be measured using the 10Hz RBW.

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The 4195A has three user functions for customizing operations for your applications without using an external computer.  The User Program gives you a one key solution for performing your application.  You can program a sequence from measurement and marker control, computing, through printing and hard copying.  This function is very useful and improves efficiency for C/N (Carrier Noise ratio), THD (Total Harmonic Distortion) measurements or automatic vice parameter extraction, such as an amplifier's gain, group delay, gain compression or harmonic distortion.  The User Math function helps you put the result in the form you need by using the built-in math operators and arithmetic functions.  For example, you can display level in volt peak-to-peak instead of volts rms or perform differentiation of gain or max hold.  The User Defined Function gives you the power to define functions which can be called with softkeys as you like, such as input of step size, signal tracking, transmission/reflection alternate sweep or gain/level spectrum alternate sweep.  In addition, the 4195A has the Program Sweep function which can arbitrarily sweep the points programmed in the table.  This increases measurement efficiency by reducing excessive points in the Lin or Log sweep.  Also, the resolution bandwidth can be independently set for each programmed point.  The above user functions and program sweep mode can be saved into the built-in 3.5 inch disc, so you can start your application at any time.

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The application oriented marker functions are very useful for both network and spectrum measurements.  You can quickly obtain the desired results from the easy to see color graphics CRT.  The Next Peak is convenient for searching harmonic or spurious signals.  The marker target is used for extraction of SAW filter's 3dB bandwidth or an amplifier's - 1dB gain compression point.  The delta marker is used for C/N measurement, and the noise marker is used for noise measurements.  A maximum of four traces can be simultaneously displayed on the CRT, so it is easy to compare the data.  The smith/polar chart is convenient for impedance matching in circuit design.  In addition, the results can be directly copied to a compatible plotter or printer without an external computer.

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