MEASUREMENTS AT VERY LOW FLUX DENSITY AND POWER FREQUENCIES

Stan Zurek – Tomasz Kutrowski – Anthony J. Moses – Philip Anderson

   Dithering and averaging allows digital "suppression" of the noise in a detected signal by a factor √n, where n is the averaged readings number. If the signal contains sufficient random noise (requirement for dithering) the effective resolution of a data acquisition card can be increased. The measurements described in this paper were performed with a 12-bit data acquisition card and it was found that the voltage resolution could be improved by over 5 bits with averaging (from up to 10 000 cycles). This means voltages lower than the card’s resolution can be easily detected with the appropriate digital processing of the measured signals.

Keywords: measurement, low flux, dithering, averaging, noise

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