SU395976A1 - DEVICE FOR DETERMINATION OF THE DIFFERENT DIFFERENT SIGN - Google Patents

Description

one

The known devices for displaying the sign of the difference of two frequencies, containing a low-pass filter and an oscilloscope, allow measuring the sign of the difference only in a narrow frequency range.

The purpose of the invention is the expansion of frequency dianzone.

This is achieved by triggering the device 5 and R, the outputs of which are connected to the first and second inputs of the device determining the sign of the difference of two frequencies, the output of the trigger is connected to the input of the LOW frequency filter, and the output of the latter is connected to the input os1,11l. ografa.

The drawing shows a block diagram of the proposed device.

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marked: oistac 1stema /, for example bilna electrical trigger S and R; () iltr 2 low frequencies; oscillograph 3.

The signals of the compared frequencies / i and / 2 alternately trigger a stable electric system, for example, trigger 1, the signals from which are fed through a low-pass filter 2 to the input of an oscillograph 3. At the same time, the angle of the part of sawtooth oscillations observed on the oscilloscope screen relative to the sweep line X, determines the difference. When this angle is less than 90 °, and when / i; f2 is greater than 90 °. A change of sign causes an abrupt change from an angle.

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Subject invention

A device for changing a sign 1 is the time of a two-frequency channel containing its low-pass filter and an oscilloscope, characterized in that, with the expansion of the first frequency range, you enter a trigger S c R, whose inputs are connected to the first second inputs of a character-determining device two frequencies, the output of the trigger with the input of the low-frequency filter, and the output of the latter is connected to the input of the osclograph 1.