SU1318929A1 - Phase-meter - Google Patents

Abstract

The invention relates to a measurement technique and is intended to measure phase shifts in analog form, preferably in the low frequency range. The goal is to increase the measurement accuracy by reducing the ripple level of the moving part of the measuring mechanism. The phase meter contains input buses 1, 2, limiter amplifiers 3, 4, differentiating circuit 5, trigger 6, low pass filter 7, subtraction unit 8, top filter 9, having first order, indicator 10. 1 Cp. lts, 1 il.

Description

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The invention relates to a measurement technique and is intended to measure phase shifts in analog form, preferably in the low frequency range.

The aim of the invention is to measure the overall languor by lowering the Pulsation Levels of the moving part of the measuring mechanism.

The drawing shows a structured schematic of the device.

.SOD device, with input bus 1 and 2, KQTOpibie connected, respectively, etc. limiting amplifiers 3 and 4 s. The differentiating circuit 5, the outputs are connected to the inputs of the trigger 6, the direct output of which is connected through the low-pass filter 7 to the first input of the subtraction unit 8, performed, for example, by an operational amplifier, outputted through the high-pass filter 9, The second order is associated with its second input, and directly with the indicator 10.

The essence of the operation of the proposed device is as follows.

The signals on busbars 1 and 2 are converted by means of limiting amplifiers 3 and 4 into square voltages. The output pulses of the differentiating circuit 5 formed by duration control the trigger 6 so that it is in the unit state for an interval T equal to the time shift between the signals on tires 1 and 2. The period T of switching-trigger 6 is equal to the period of signals on tires 1 and 2 .. Low-pass filter 7 extracts the average value of the voltage at the direct output t

trigger 6 u

wed

E (where E is ampli

Compiled by S. Kulish Editor L, Gratilo Tehred M. Khodanych

2505/38

Circulation 730 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

189292

there are trigger pulses 6), which is proportional to the phase shift of the si-channels on tires 1 and 2. The voltage has pulsations, the amplitude of which J depends in general on the value of period T and the time constant of filter 7, as well as on the transmission coefficient of filter 7.

The variable component (ripple) is extracted and amplified from the output signal of the calculator 8 using the high-pass filter 9 and subtracted from the output signal. So the resulting pulsations,

J5 acting on indicator 10 is significantly attenuated. This reduces the amplitude of oscillation of the movable part and increases the accuracy of measurements.

20

Claims (2)

1. Phase of the ether containing the indicator, high-pass filter, two input 25 wired, connected via limiting amplifiers with inputs to a differentiating circuit, the outputs of which are connected to. the first and second inputs of the trigger, the direct output of which is connected to the input of a low-pass filter, characterized in that, in order to improve the measurement accuracy, a subtraction unit is additionally inserted, and the output of the low-pass filter is soeg dinene the output of which is directly connected to the input of the indicator, and through a high-pass filter to its second input. 40 2. Phase meter according to claim 1, about tl and h a yu shch and so that the high-pass filter is made in the form of a filter of the first order. Proofreader S. Cherni