Agilent / HP / Keysight 3585A

The Agilent 3585A is a 20 Hz to 40.1 MHz, microcomputer controlled spectrum analyzer which can be used for spectrum analysis or network analysis applications.

As a spectrum analyzer, the Agilent 3585A provides a graphic display of the spectral components of the input signal. For network analysis measurements, the 3585A Tracking generator can be used as a drive signal for the network under test.

The network's output can then be applied to the 3585A input to obtain a graphic display of the network's amplitude versus frequency response.

The 3585A is structured as a conventional triple-conversion, swept super-heterodyne spectrum analyzer. The addition of microcomputer hardware control and data manipulation greatly enhances the analytical power of the 3585A.

The microcomputer control gives the 3585A several unique features. The most obvious feature is the keyboard entry of parameters which replaces more conventional knobs. Microcomputer further allows the operator to override the automatic features of the 3585A.

The 3585A's local oscillator is fully synthesized using HP's patented Fractional N technique. This provides frequency settability of 0.1 Hz over the 20 Hz to 40.1 MHz range.

The advanced design of the 3585A's Fractional N synthesized Local Oscillator also results in phase-continuous, linear sweeps with low spurious sidebands.

The amplitude accuracy of the 3585A is enhanced by and Automatic Calibration system, through which internal analog offsets and errors are removed using the internal 10 MHz reference as a level and frequency standard and the Tracking Generator with and internal calibrator as a flatness standard.

The trace information displayed on the 3585A CRT is digitally stored in memory. As a result, flicker-free, non-blooming displays are maintained independent of sweep time.

The 3585A keyboard controls are completely HP-IB programmable. In addition, commands are available to output information such as active or stored keyboard settings.