A highly-sensitive weak-signal complex-amplitude meter |
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| Authors: | V N V’yukhin |
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| Affiliation: | (1) Institute of Automatics and Electrometry, Siberian Division, Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk, 630090, Russia |
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| Abstract: | A measuring section of a multifrequency electromagnetic ground-probing device operating at discrete frequencies in a range of 2.5–250 kHz is described. The measuring section of the device contains a lownoise amplifier, complex-signal demodulator, and integrators based on δ-σ analog-to-digital converters. The following characteristics of the device are attained: the root-mean-square noise is 20 nV, the measurement range is ±500 μ V, the number of bit is 20, the measurement time is 80 ms, and the power-line noise suppression at 48–52 Hz is more than 120 dB. |
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