ABSTRACT
In the electronic field, frequency is a kind of most basic
parameter, and all there are close relations in the measurement schemes
of many other electric parameters and result of measuring. Because the
signal anti-interference ability of frequency is strong, easy to
transmit, can obtain higher measurement precision. So, the measurement
of frequency seems particularly important, the research of the method is
being paid attentionto.
The Frequency meter, as one kind of the measuring instrument, often
called the electronic counter, its basic function is that frequency and
application of cycle Frequency meter of measuring the signal are in a
very large range, it not only applies to general simple instrument
measurement but also apply to other fields such as teaching, scientific
research, high-accuracy instrument measuring, industrial control
extensively. With the rapid development of microelectric technique and
computer technology, especially appearance and development of the
one-chip computer, the instruments have all changed enormously in such
aspects as principle, function, precision and automatic level to enable
the traditional electronic side amount, form a kind of side amount
instrument of new generation that totally broke through the traditional
concept. The Frequency meter has adopted the high-speed integrated
circuit and large scale integrated circuit extensively, make the
instrument change greatly in such aspects as miniaturize, power
consumptive, dependability. At present, there are various digital
Frequency meter of multi-function, high precision, high frequency on the
market, but the price is high.
In order to meet the need of the real work, design and provide one
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