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The HP 3580A Spectrum Analyzer is a low frequency high performance analyzer. Its 1 Hz bandwidth allows the user to examine noise and extraneous signal content close in to a signal of interest. For low frequency applications where sweep speeds can be slow and time-consuming, a special feature, adaptive sweep, allows the user to set a threshold above which only the spectra of interest are observed. In this mode, the CRT is rapidly swept. When a signal is encountered, the sweep slows down to reproduce full response. A factor of ten speed gain is possible. Digital storage is another important feature which enhances the display for slowly swept low frequency signals. The analyzed signals are digitized and stored in memory. Trace information is then read from memory at a rate appropriate for obtaining an analog-like display. Specifications. Range: 5 Hz to 50 kHz. Digital Frequency Display. Resolution: 1 Hz. Accuracy: ±3.5 Hz, 0 to 55°C. Typical stability: ± 1 0 Hz/ hr after 1 hour; ±5 Hz / °C. Dynamic range: 80 dB. IF feedthru: input level > 10 V, -60 dB; < 10 V, -70 dB. Spurious responses: >80 dB below input reference level. Smoothing: 3 positions, rolloff is a function of bandwidth. Scan width: 50 Hz to 50 kHz. Log sweep: 20 Hz to 43 kHz ± 20% after 3 sweeps. Sweep times: 0.1 s to 2000 s. Options. Opt 001: internal rechargeable battery. Opt 002: balanced input.
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