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产品描述

The instrument is an electromagnetic signal digital recorder, which counts and saves the acquisition results every hour. When working, the instrument automatically and continuously receives and records electromagnetic signals at an interval of 10 milliseconds. The number of recording units does not change when there is no signal or when the signal is very weak. When there is a signal, the signal is amplified by the amplifier, and the useless signal higher than the 20HZ frequency is filtered by the eighth-order digital filter, and then A / D conversion is carried out to determine the amplitude of the signal. Then, according to the magnitude of the amplitude value and the current date time and probe number, the alternation times are recorded in the unit of the non-volatile memory corresponding to the amplitude value. It works in such a cycle so as to achieve the purpose of saving the number of times the signal traverses the amplitude value per hour according to different signal amplitudes.

产品介绍

The monitor divides the signal amplitude into four levels, for example, when the full amplitude range is 5V, it is divided into four amplitudes greater than 0V, more than 1.5V, more than 3V and more than 4.5V.For the electromagnetic signal, we only record two amounts of information, one is the four amplitude values, and the other is the number of times the signal passes through the amplitude value in a unit time (one hour).?After such digital quantization, the data is saved per hour, which is not only a small amount of data, but also easy to analyze, not only reduce the cost, but also improve the reliability.?

When judging, we can calculate the strength change of the received electromagnetic wave signal according to the recorded data: if the data are recorded in several amplitude levels, it means that the electromagnetic wave signal has strong energy and large amplitude; if the count