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wobbulator

A wobbler is a generator whose output frequency changes in an adjustable rhythm. The output signal of the wobbler is a constant-amplitude AF signal or RF signal that changes continuously in frequency between a lower and an upper cut-off frequency, which is also referred to as a sweep.

The sweep range, i.e. the frequency range between the lowest and the highest sweep frequency, is adjustable, as is the output level or the sweep speed at which the frequency band is swept. Wobbling is used exclusively in quadripole measurement technology and is intended to investigate the amplitude behavior of quadripoles at different frequencies. In this context, the determination of the passband curves of filters and bandpass filters, of amplifiers, cables, demodulators, devices and systems of audio and RF technology up to microwave technology are to be mentioned.

Sweep of a sinusoidal signal between 50 Hz and 5 kHz, screenshot: Agilent

Sweep of a sinusoidal signal between 50 Hz and 5 kHz, screenshot: Agilent

In sweeping, the output signal of the sweeper is connected to the input of the quadripole and an oscilloscope or spectrum analyzer is connected to the output of the quadripole. The horizontal deflection of the connected measuring instrument is controlled by the sweep so that the display is synchronized in time and frequency with the frequency change of the sweep. The display on an oscilloscope screen shows the frequency-dependent envelope curve of the quadrupole.

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Englisch: wobbulator
Updated at: 23.10.2020
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Translations: DE