SU1437797A1 - Phase meter - Google Patents

Abstract

The invention relates to the field of phase-measuring equipment. The purpose of the invention is to improve the accuracy and noise immunity of the phase meter. The reference and measuring input signals of the phase meter using synchronizer 1 and switch 2 are alternately fed to the driver 3 pulses. The received reference pulse, the passage through the switch 4, resets the counter 5 to zero, counting the clock pulses received at its input from the synchronizer .1. The measurement pulse following the reference pulse passes through the switch 4 to the coincidence circuit 10 and then to the input of the register entry 6. At the same time, a code proportional to the phase shift is written from the counter 5 to the register 6. A notch filter 7 is introduced into the phase meter, the output of which produces pulse noise that does not coincide in frequency with the frequency of the input signal, the amplitude detector 8 and the D-flip-flop 9. The latter is triggered by the specified pulse noise. register entries 6. In this way, the phase meter is protected from impulse noise. 1 il. o (l

Description

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The invention relates to a measurement technique and can be used to measure the phase difference between two signals.

The purpose of the invention is to improve the accuracy and noise immunity of measurements.

In the drawing .brought structured phase diagram of the phase meter

The phase meter contains a series-connected synchronizer 1, switch 2, driver 3.

pulses, switch Ap counter 5 and regis -r b, the second input of counter 5 is connected to the second output of synchronizer 1, the third code of which is connected to the second input of the imaging unit 3j and the first output to the second input of the switch 4, and the series-connected relays the rotary filter 7, the amplitude discriminator 8, the trigger 9 and the coincidence circuit 10, the second code of which is connected to the second output of the 1 switch 4, the first output of which is connected to the KJ R input of the trigger 9, the D input of which. It is connected to the third output of the Is synchronizer at THIS switch output. 2 is connected to the input of the notch filter 7j and the output of the co-op circuit. Zero signal with inverse

pulses corresponding to the time interval between short pulses, i.e. phase difference between input signals. However, in many phase meter applications, the input signals were poured; they are impulse noise. Interference indicated. Entering the form

The 1-girovatel 3, displace the moments of the formation of short pulses at its output to even lead to the appearance of spurious. Both cause significant measurement errors. In order to eliminate this drawback, the signal from the output of the switch 2 is fed to the input of the notch filter 7, the zero transfer characteristic - which is tuned to the frequency of the input signals. In the absence of interference, the signal at the output of the notch filter 7 is zero (with the exception of sections of the switch). Pitch 1 in the input signals, the pulse interference passes

the filter 7 is almost without attenuation, fixed by the amplitude discriminator 8, the signal from the output of which is fed to the synchronous input of the trigger 9 and sets it to the unit

drop connected to the second input of register 6.

Phase meter works as follows

. . At the inputs of the phase meter, signals of the sound frequency are received, the phase difference between which is to be measured. Switch 2, controlled by synchronizer 1, alternately connects the specified input signals to the input of the pulse shaper 3. At the output of the imaging unit 3, short pulses are produced, corresponding to the zero-crossing times of the input signals. The imaging unit 3 is gated with a signal from the third output of synchronizer 1 to eliminate transients in the switching sections. KB is a good impulse J corresponding to one input signal, through commutator JTop 4 resets counter 5, which matches clock pulses from the output of syn- tronizer 1. A short impulse corresponding to another input signal, through KOMhjyTaTop 4 and circuit 10 coincidence enters the control input of register 6 and rewrites the contents of counter 5; As a result, register 6 records the number of clock

five

0

five

0

five

the trigger output closes the coincidence circuit 10, a write pulse to the register 6 from the switch A does not occur, and the measurement in the current period is commu- nated. In the next switching period, the trigger 9 is reset by a pulse from the output of the switch 4 "To eliminate the triggering of the trigger 9 during the switching of switch 2, a strobe pulse is received from its synchronizer 1,

The advantage of such a phase meter is TOMj, which excludes from measurement the portions of the input signals affected by impulse noise. Using it allows you to significantly improve the accuracy and noise immunity of measurements.

Claims (1)

Formula from obnom te.NIN An F1313 meter containing a synchronizer connected in series, a switch5 driver that is equipped with a YB switch, a counter and a register, the second counter input is connected to the second synchronizer output, the third output of which is connected to 3 1437797 to the second input of the driver, and first to the second output of the switch, the first the left output - to the second input of the switching output of which is connected to the R input torus, characterized in that the trigger, whose D-input is connected that, in order to increase the accuracy of the -, - to the third output of the synchronizer, measurement and noise immunity, while introducing the output of the switch that is connected in series to the switch is connected to the input of the notch filter, the same filter, amplitude of the bottom-and the output of the coincidence circuit is connected the criminator, the trigger and the scheme coincided to the second input of the register. NIN, the second input of which is connected