Basic components of electronic counter

Basic components of electronic counter:

(1) the channel for the transport

The input channel is the input circuit, the function is to receive the measured signal, and to amplify the signal to be measured, and then into the gate (that is, the main door or signal door). The transmission channel typically consists of A, B two independent unit circuits.

A channel is a channel for counting the pulse signal. It on discovery signal amplification shaping and transformation, the output of the counting pulse signal. Counting pulse signal through the gate into the decimal counter, decimal counter trigger pulse source.

The B channel is the channel of the gate time signal, which is used to control the opening and closing of the gate. The output signal is then used to trigger the gating circuit (bistable trigger), which is used to trigger the gating circuit, and the state of the output signal is reversed. A gate is opened with a pulse and a gate is closed for the next one. In the period, the decimal counter is counted by counting pulses passing through the A channel. In order to ensure that the signal can be triggered at a certain level, the input signal can be continuously adjusted to the level of the input signal, and can be arbitrarily selected for the required impulse polarity.

Some general counter gate signal channel has B, C two channels. B channel is used as the starting channel of the gating circuit, so that the gating circuit is turned over, and the C channel is used to stop the channel, so that it can be recovered.

(2) counting display circuit

It is a decimal counter display circuit for counting the pulses (i.e., counting pulses) of the gate, and the result is displayed in decimal form.

(3) standard time generating circuit

The standard time signal is provided by a quartz crystal oscillator as the internal time reference for the electronic counter. The standard time signal is amplified and shaped and frequency doubled, which is used for the measurement of the time signal. Frequency measurement, standard time signal after amplification shaping and a series of frequency by controlling the time base signal of the gating circuit, time base signal after gating circuit form a gating signal.

(4) logic control circuit

Generate various control signals for controlling the coordination of various unit circuits of electronic counters. In general, the working procedure of each measurement is: prepare ~ ~ ~ show ~ ~ ~ ~ ~ to prepare the next measurement, etc..

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