SU454502A1 - Phase meter - Google Patents

Description

The invention relates to the field of phase-measuring technology and is intended to measure the phase difference of intermittent voltages.

Known phase meters without frequency conversion, containing amplifiers-limiters, trigger, circuit, consisting of resistor R and capacitor C, indicator.

Such phase meters work only if the signals at the phase meter inputs are continuous oscillations, since the time / C-value constant is chosen so that the voltage on its output is equal to the average value of the output trigger pulses and provides the necessary speed.

The purpose of the invention is to reduce the error in measuring the phase shift at intermittent input voltages of a phase meter.

This is achieved by introducing into the phase meter two detectors, a coincidence circuit, an additional trigger, a phase inverter, and a bridge circuit, with two detectors connected between the outputs of the limiting amplifiers and the inputs of the coincidence circuit, the output of which is connected via series-connected additional trigger and phase inverter between a resistor R and a capacitor C.

The drawing shows a flowmeter diagram of the phase meter.

The circuit contains limiting amplifiers 1 and 2, trigger 3, indicator 4, detector 5, additional detector 6, coincidence circuit 7, additional trigger 8, phase inverter 9, bridge circuit 10, resistor R n capacitor C.

The input voltages are fed to the inputs of limiting amplifiers 1 and 2. The voltages from the outputs of the limiting amplifiers are fed to the inputs of the detectors. The voltage from the outputs of detectors 5 and 6 is fed to the input of the matching circuit 7 and from its output to the additional trigger 8. If the voltages in both channels of the phase meter are continuous, the additional trigger is in the initial state and the bridge circuit 10 is open.

At the time of the disappearance of the signal under study, at both inputs of the phase meter or in one of them the voltage at the output of the circuit

the coincidence is drastically reduced, and the additional trigger difference in this voltage is overturned. With the signal blip, the trigger returns to its original state. Thus, the pulse duration on

the output of the additional trigger is equal to the time of the absence of the signal under investigation both in both channels simultaneously and in one of them. If the time of absence of a signal in different

phase meter channels are different, then an additional trigger will generate a pulse, the duration of which is equal to the maximum time of absence of a signal. This pulse through the phase inverter is applied to the bridge circuit and closes it for the time when there is no signal at the phase meter inputs.

Subject invention

A phase meter containing limiting amplifiers connected to the trigger, a circuit consisting of a resistor R connected to the trigger, and a capacitor C connected

to the indicator, characterized in that, in order to improve the accuracy of measuring the phase shift with intermittent voltages in both channels, it is equipped with two detectors, a coincidence circuit, an additional trigger, a phase inverter and a bridge circuit, with two detectors connected between the outputs of the limiters and the inputs of the coincidence circuit, the output of which is connected in series with an additional trigger and a phase inverter with a bridge circuit connected between resistor R and capacitor C.

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