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Sampling frequency meter

Lockerbie, N.A. (1984) Sampling frequency meter. Electronics & Wireless World, 90 (1576). pp. 37-40. ISSN 0266-3244

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Abstract

The author describes a low-cost battery-powered instrument based on the c-mos Motorola MC146805 E2P microprocessor. In this instrument the input is sampled repetitively and compared with a table of values stored in memory, so that over time, a distribution of the sampled input is built up in 21 internal memory channels (20 channels plus 1 'over-range' channel). The program controlling the microprocessor can be adapted to suit different needs by simply changing the values stored in this table, and/or by changing the measuring period.