SU1226336A1 - Phase-meter - Google Patents

Abstract

The invention can be used to measure the phase difference between two signals in telemetry systems and in discrete information transmission equipment. The purpose of the invention is to improve the measurement accuracy. The phase meter contains a trigger, amplifiers - limiters 2 and 3 at the inputs, low-frequency filters 4 and 11, indicator 5, generator 6, amplitude detector 7, switches 8 and 10, and amplifier 9 with adjustable gain. The introduction of switches, an amplitude detector, a low-frequency filter 11, an amplifier with adjustable gain, and the formation of new connections between the elements of the device made it possible to adjust and stabilize the amplitudes of the trigger signal carried out by the amplifier with an adjustable gain amplifier. 1 il. S (l

Description

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The invention relates to a measurement technique and is used to measure the phase difference between two signals, in telemetry systems and in discrete information transmission equipment.

The purpose of the invention is to improve the measurement accuracy by adjusting and stabilizing the amplitude of the trigger signal carried out by amplifiers with an adjustable gain factor.

The drawing shows a structural diagram of the proposed phase meter.

It contains trigger 1, amplifiers, limiters 2 and 3 at the inputs, low-pass filter A, indicator 5, generator 6, amplitude detector 7, first switch 8, amplifier 9 with adjustable gain, second tator 10, and additional F1 ть ttr 11 low frequencies.

At the same time, the device inputs through limiting amplifiers 2 and 3 are connected to the inputs of trigger 1, respectively, and the output of trigger 1 is connected via a series-connected switch 8, amplifier 9, second switch 10, low-pass filter A to the indicator input 5. In addition, the input of the amplitude detector 7 is connected to the output of the trigger 1, and the output of the same detector is connected to the second input of the switch 8. The output of the generator 6 is connected to the control inputs of the switches 8 and 10, and the second output of the switch 10 through the low-pass filter is connected to the control at the input of the amplifier 9.

The phase meter works as follows.

Signals between which it is necessary to measure the phase shift arrive at the inputs of the limiting amplifiers 2 and 3, generating impulses whose fronts coincide with the moments of zero crossing of the investigated voltages. At the output of trigger 1, switchable by the fronts of the indicated pulses, while the duration of the logic level at the output of the trigger is proportional to the time shift between input voltages. Filter 4 nilsnyh frequency reduces the amount of ripple to a value that provides the required measurement accuracy.

However, the instability of the trigger output level causes

There is no additional measurement error, since the output of the filter 4 is proportional to the specified level. In a wide temperature range, stabilization of the latter is almost impossible. To eliminate this drawback, the signal from trigger input 1 is fed to an amplitude detector 7, the output of which produces a signal in the form of a constant voltage proportional to the level of the output signal of trigger 1. Signals from the outputs of trigger 1 and detector 7 using the first switch 8, control alternator 6, alternately connected to the input of amplifier 9 with adjustable gain. The second switch 10 performs the reverse division, i.e. the signal passed through amplifier 9 from the output of the detector 7 is fed to an additional low-pass filter 11, and the signal passed to amplifier 9 from the output of trigger 1 is fed through filter 4 to the indicator 5.

The output of the additional filter 1 1 forms a constant voltage proportional to the level of the output signal of the trigger 1, which goes to the control input of the amplifier 9. As a result, the gain of the latter becomes inversely proportional to the specified level, and the signal from the output of the trigger I, passes the amplifier 9 and the filter 5 becomes independent of the output level of the trigger 1.

Claims (1)

Invention Formula Phase meter whose inputs are connected to amplifier limiters whose outputs are connected to the trigger control inputs, containing a low-pass filter connected to the inductor, and a generator, characterized in that, in order to improve the measurement accuracy, two switches are inserted, amplitudes - ny detector, additional filter low-frequency amplifier with adjustable gain, while the trigger output is connected to the inputs of the amplitude detector and the first switch, the output of the amplitude detector is connected to the control input of the first switch, the output of which is through the amplifier with adjustable gain and the second switch connected to 312263364 The input of the low-frequency filter, the horn with adjustable gain, and the swarm of the output of the second switch through the inputs of the first and second switch, an additional filter of the low frequency relays are connected to the output of the header and connected to the control input of the amplifier.