SU631842A1 - Two-channel phase meter - Google Patents

Description

one

 The invention relates to a phase-measuring technique, which can be used in two-channel phase difference meters with the conversion of a phase shift into a time interval.

Known avuhkanalny phase meter containing amplifiers-limiters and differentiating circuits in the reference and measurement channels l,

Known phase meter has a complex scheme.

A phase meter is also known, containing limiting amplifiers, differentiating circuits, averaging block, phase reading block, and sign indicator 2,

The known phase meter has a low speed over the sign channel. This is due to the fact that information about the phase sign is obtained from the averaging block containing integrating elements,

The purpose of the invention is to increase the frequency of the phase meter.

To achieve this goal, two bistable multivibrators and a three-channel switch, the common busbar of which is connected to the input of the first bistable multivibrator connected to the output, are inserted into a two-channel phase meter containing serially connected amplifiers limiting and differentiating circuits in the reference and measuring channels. with phase reading unit. The first input of the three-channel switch is connected to the output of the amplifier-limiting device of the measuring channel, the second input is connected to the output of the amplifier of the reference channel limiter, the third one is connected to the input of the second bistable multivibrator, the output of which is connected

To sign indicator; the first control input of the three-channel switch is connected through a diode to the output of the reference circuit differentiating circuit; the second and third control inputs are combined

and are connected via a diode to the output of the differentiating circuit of the measuring channel.

Claims (2)

The drawing shows a phummental phase meter diagram. The Phasometer will couple amplifiers-limiters 1 and 2 in the measuring and reference channels: the differentiating circuits of the measuring and reference channels are formed by elements 3-6; a three-channel switch 7 including transistor switches 8-10; bistable) 1Be multivibrators 11 and 12, reading unit 13 phase, incicatir 14 phase sign, diodes 15 and 16. The device works as follows. When the input terminals of the device are connected to the sources of the reference and measured voltages, rectangular pulses are formed at the outputs of the limiters 1 and 2, the fronts of which correspond to the moments of transition of the sinusoidal signals through zero values. At the outputs of the differentiating circuits 3-6, short pointed pulses are formed, which are used to control the switch 7. Negative pulses through the pins 15, 16 are fed to the gates of the keys 8-10 and unlocked them for the duration of the negative pulses. As a result, short bipolar pulses are generated on the common busbar of the switch 7, controlling the state of the bistable multivibrator 11. At the output of the multivibrator, negative pulses of duration T characterize the magnitude of the phase shift module between the reference and measured voltages. The magnitude of the phase shift is determined by the reading unit 13 by measuring C. The sign of the phase shift is defined in the sign 1 scale formed by the key 1O, the multivibrator 12 and the indicator 14 of the phase sign. Key 10 is locked synchronously with key 9, since their control inputs are combined. Thus, the pulsed multivibrator 12c of the common bus switch 7 passes only those pulses that coincide in time with negative pulses at the gate of the 1O key. In advance, the measured pulses of the reference multivarter 12 receive positive pulses, and at its output a negative DC voltage is established that controls the operation of the indicator 14 of the signs of the phase angle. When the phase shift changes sign, multivibrator 12 receives negative pulses that switch it to another stable state. The positive voltage from the multivibrator 12 controls the indicator 14, which is judged on the sign of the phase angle. The described phase meter does not contain an averaging block, which allows to increase the speed of the sign channel. Claims of the invention A two-channel phase meter comprising a series-connected amplifier limiting and differentiating circuits in the reference and measurement channels, a phase reading unit and a sign indicator, characterized in that, in order to improve speed, two multivibrator bistables are inserted and a three-channel switch, whose common bus is connected the input of the first bistable multivibrator connected by the output with the reporting phase unit, while the first input of the three-channel switch is connected to the force input Ate of the measuring channel limiter, the second input — with the output of the reference-channel amplifier limiter; The second and third control inputs are combined and connected via a diode to the output of the measuring circuit's differentiating circuit. Sources of information taken into account during the examination: 1. Author's testimony in the USSR, NO 471554, Q 01 R 25/00, 1975. 2. USSR author's certificate 3 481854, Q 01 R 25/00, 1975.