SU494705A1 - Digital Phase Phase Meter - Google Patents

Description

one

The invention relates to devices for measuring the phase shift between two equal voltage voltages and can be used in automatic radio engineering systems.

A digital phase meter with a digital lagometer is known, comprising a time generator, a counting frequency generator, the outputs of which are connected to the inputs of controllable gates, a reversible counter, a three-position switch and a recording device. However, this phase meter has low accuracy and low speed.

The aim of the invention is to improve measurement accuracy and speed.

This goal is achieved in that the inputs of the reversible counter are connected to the outputs of two controllable gates, the inputs of the three-position switch are connected respectively to the driver, the reversible counter and the digital lagometer, the outputs of the three-position switch are connected to the controllable valves, and the input of the reading of the reversible counter is connected to the input a digital lagometer divider, with the divider input connected to the output of one of the controlled gates, and the output to the recording device.

FIG. 1 is a block diagram of the proposed phase meter.

The phase meter contains a shaper of time intervals 1, a generator of counting frequencies 2, gates 3, 4, 5, switch 6, reversible counter 7, digital lagometer 8, recording device 9.

FIG. 2 but a three-position electronic switch (optional) is shown, which contains a valve 10, a trigger 11, a valve 12, an inverter 13, a trigger 14, a valve 15.

Phase meter works as follows.

In the intervals corresponding to the period of the measured signal, which are formed by the shaper of time intervals 1, the digital lagometer 8 through the gate 5 receives pulses from the generator of counting frequencies 2. At the same time, in the intervals corresponding to the time shift between the signals, to the recording input of the reversible counter 7 through the gate 4 pulses are also coming from the generator

2. After the number of pulses specified by the program is recorded in the divider register of the digital lagometer 8, the resolution from the three-position switch 6 is transferred to the phase meter from the “write period codes and time shift to the“ read phase shift ”mode. Switch 6 makes a switch to the new mode during the period when gates 4 and 5 are closed, so as not to introduce errors due to incomplete recording

the code group, in the "read" position, the switch 6 removes the "permission" from the gates 4 and 5 and gives the "permission to the gate 3 connected between the counter frequency generator and the read input of the reversible counter. The same pulses are fed to the input of the divider of the digital lagometer. When the reversible counter returns to the bullet position, from its output to the three-position switch 6, a signal is received that puts the switch in the neutral position, at which all the gates are closed. The next switching of the phase meter into the "record" mode is made by the switch 6 when a signal arrives from the driver that the valve 5 does not have permission to encode the signal period. After that, the phase meter starts the next measurement.

If there is a coincidence. “The permissions from the digital lagometer and from the driver at the inputs of the valve 15 from the output of this valve receive a signal to transfer the trigger 14 to such a position that it receives a“ ban on valves 4 and 5 through the inverter 13 n ”permission to one of the inputs of the valve 10. In addition, the same trigger when switching throws the trigger 11 to the second position, from which the resolution “comes on the second input of the valve 10, resulting in the release of the valve 10 on the output“ resolution on the valve 3. On returning the reversible counter the bullet position (after the end of the reading) from its output on the trigger 11 receives a signal returning, Ayush, its trigger to its original state, resulting in

The permission from one of the inputs of the valve 10 is removed, and the valve 3 is locked.

However, the unlocking of the valves 4 and 5 will occur only after the coincidence of the permissions from the output of the trigger 11 and from the driver 1 at the inputs of the valve 12, as a result of which the trigger 14 is returned to its initial state.

Thus, the phase meter ensures stable operation in the frequency range of 0.1 - 30 KHz with a basic error of less than 0.2 °, determined mainly by the sampling resolution.

Subject invention

A digital phase meter with a digital lagometer containing a time interval generator, a generator of counting frequencies, the outputs of which are connected to the inputs of controlled ones

valves, reversible counter, three-position switch and recording device, characterized in that, in order to improve measurement accuracy and speed, the inputs of the reversible counter are connected

the outputs of two controllable gates, the inputs of the three-position switch are connected respectively to the driver, the reversible counter and the digital lagometer, the outputs of the three-position switch are connected to

the controlled valves, and the readout input of the reversible counter is connected to the divider input of the digital lagometer, the divider input connected to the output of one of the controlled gates, and the output to the recording device.