| 摘要 |
an oscillating circuit being connected, through a digital/analog converter and a first amplifying circuit, to an output terminal of a microcomputer connected to a key manipulating unit and a display; an amplifying adjusting unit and a first comparator for receiving an output signal from the oscillating circuit via a first buffer, the first comparator transmitting an output frequency thereof to the microcomputer via a frequency/voltage converter and a second comparator; a measuring filter for receiving an output signal of the amplifying adjusting unit via a second buffer and for applying an output signal thereof to an analog/digital converter via a third buffer, a second amplifying circuit and a peak detector; and a latch circuit for transmitting output data from the measuring filter to the microcomputer.
|
