HP 3582A High-Resolution, Low-Frequency Spectrum Analyzer 0.02 Hz to 25.6 kHz
This used HP 3582A spectrum analyzer is in very good operational and cosmetic condition. It is a dual-channel spectrum analyzer covering the frequency range of 0.02 Hz to 25.6 kHz. By combining advanced digital processing techniques and a powerful micro-computer, it can provide measurement capability previously found only in complicated computer systems.
The performance features of the instrument provide optimal solutions to the problems of low frequency spectrum analysis. Frequency spans from 1 Hz to 25 kHz full scale allow great flexibility in selecting the portion of the spectrum to be analyzed. The spans from 5 Hz up to 25 kHz can be positioned anywhere within the frequency range of the instrument to provide exceptionally good frequency resolution.
Without resorting to external signal conditioning, the instrument can measure input from + 30 dBV (31.6 volts) down to - 120 dBV (1 microvolt). Even with this high sensitivity, the input circuits are protected against overloads of up to 100 volts. For measurements where the signal of interest exists in the presence of large unwanted signals, the wide 70 dB dynamic range of the instrument is important.
These spectrum measurements are made with "real-time" speed for frequency spans less than 500 Hz. Here real-time means that processing time is less than data acquisition time so that no input data is "lost" while waiting for processing. Data acquisition time must be increased for narrower spans to provide the required resolution. For broader spans, data acquisition time is small and processing speed becomes the limiting factor.
The Model 3582A can also measure the phase of the various spectral components or transfer function. This makes it possible to fully characterize a signal and can provide new insight into the operation of complex electrical or mechanical devices. The most significant additional measurement capabilities of the instrument result from having two input channels that operate simultaneously. Not only can independent input signals be examined for common characteristics, but also device input/output relationships can be evaluated. The instrument directly provides both amplitude and phase information of the transfer function of a device. A built-in pseudo-random noise or a built-in random "band limited white noise" source can be used to drive the device under test to perform low frequency network analysis.
Many signals cannot be analyzed with conventional spectrum analyzers because they are not stable. Digital signal processing techniques allow the Model 3582A to capture and analyze transient signals that last for only a few milliseconds. In the Model 3582A, the large-screen CRT makes the measurement results avilable in a highly usable form. In addition to two simultaneous information traces, the display provides four lines of alphanumeric data giving measurement configuration and results. The alphanumeric marker makes it possible to read results directly in absolute or relative units.
In addition to measurement results, the CRT is also used to display operational diagnostic messages.
In order to provide maximum confidence in the operation of the instrument, self test routines have been built in. These tests, in conjunction with the internal calibration signal, make it possible to quickly verify the calibration of the instrument before beginning a critical measurement sequence.
Virtually all of the measurement functions of the Model 3582A are remotely programmable via the Hewlett-Packard Interface Bus (HP-IB). Since actual measurement data can be remotely input or output, it is possible with a computing controller to extend the basic measurement capability.