The electronic counter can access all kinds of analog to digital converters in its input channel, and then make various digital instruments with the corresponding interchanges. The advantages of electronic counters are high accuracy, wide measuring range, many functions, simple operation, fast measuring speed, direct display of numbers, and easy realization of automation of measurement process, and have been widely applied in industrial production and scientific experiments.

Electronic counters have the following three basic functions:

1, frequency measurement: when the measured signal is input from the channel of the digital display frequency meter, if the input is 1 second, the reading N is the frequency fA of the unit. The standard frequency signal output from the crystal oscillator is divided into frequency by time base circuit to form the gate time signal and determine the measurement value.

2, cycle or time interval measurement: the measured signal is input from the channel to the digital display frequency meter, and the gate circuit is controlled, and the input signal of the path is the clock pulse signal provided by the time base circuit. The number of counters counted is gate opening time, that is, the period or time interval of the measured signal.

3. Cumulative count: the open gate is triggered by manual / machine, and the counter accumulates count of the channel signal.

On the basis of these functions, some auxiliary circuits or devices are added, and the counters can also perform the functions of multi period average, time interval averaging, frequency ratio and frequency expansion. The performance indicators of electronic counters mainly include: frequency, cycle, time interval measurement range, input characteristics (sensitivity, input impedance and waveform), accuracy, resolution and error (counting error, time base error and trigger error).

The SYN591 type multi counter is a multi-functional, highly reliable and special digital panel table. This product adopts the standard installation dimension, with a self pushing structure, which has beautiful appearance and convenient installation. Five button operation, central processor CPU control, can achieve a variety of parameter settings, with strong flexibility and practicality. It has stable and reliable operation in industrial and other strong interference environment. It has the characteristics of accurate measurement, fast speed, convenient reading, stable performance, clear display and excellent technology. Widely used in energy, machinery and chemical industry, light industry, all kinds of instrumentation, control equipment, etc., is the best product of all kinds of pointer list renewal. Typical application instrumentation, medical facilities, industrial control equipment product development, petroleum, chemical industry, environmental protection, mining system control point monitoring, industrial equipment operation measurement, monitoring and remote control, PLC, DCS system operation data acquisition and display;

The digital display frequency meter has 27 measuring functions, and supports all kinds of pulse measurement applications.

It can be equipped with all kinds of sensors, such as no voltage contacts, photoelectric switches, proximity switches, rotary encoders and so on.

The high precision measurement range is 0.0001Hz to 30kHz.

The memory function is reduced by counting value, maximum value and minimum value.

The measured value shows that the update cycle can be set, and the brightness of the display can be adjusted by one key to facilitate viewing.

2 sets of alarm output, alarm type, action return error, opening delay, closing delay can be set. Sound alarm can be set.

The input range or filter coefficient of the measurement interface can be set up to filter out the interface jitter of different signals.

Photoelectric isolation analog signal transmit output function, current output (4-20mADC, 0-20mADC, 0-10mADC);

Photoelectric isolation analog signal conversion output function, voltage output (0-10VDC, 0-5VDC, 1-5VDC);

Photoelectric isolation communication interface RS-485/RS-232C, baud rate range 2400 ~ 38400bps adjustable;

There are two ways to reduce the conversion error. First, the implementation of multi cycle measurement. Similar to the quantization error reduction method, the multi period measurement method of conversion error also doubles the period T. Assuming that the 10 cycle is measured, according to the periodic chart, the transformation errors generated by the two adjacent periods are mutually exclusive. That is, in the 10 measuring periods, the actual error is only the first cycle and the last cycle, and the error is the same as that of measuring a cycle, so the conversion error can be effectively reduced by the cycle doubling method. The second method is to increase the signal-to-noise ratio, that is, increase the ratio of the interference signal to the noise signal, so that the conversion error can also be reduced.

Although the error of industrial counter measurement cycle can not be fundamentally eliminated, but through in-depth analysis of the causes of the conversion error, quantization error and various errors, we can work out a relatively effective way to reduce the error. With the continuous improvement of the electronic counter and the continuous improvement of the method of error reduction, we believe that the measurement cycle error will be reduced to the minimum.

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