SU381038A1 - DIGITAL PHASOMETER FOR MEASURING THE AVERAGE VALUE OF SHIFT PHASES - Google Patents

Description

one

Digital phase meters are known for measuring the average phase shift value, comprising a trigger, electronic keys, a pulse shaper, a switch, counters, and a quantizing pulse generator.

The purpose of the invention is to improve the measurement accuracy by eliminating the start error and reducing the quantization error. It is achieved by the fact that the proposed phase meter is equipped with a coincidence circuit, a pulse counter and a prohibition circuit.

The drawing shows the block diagram of the device.

Phase meter contains keys 1 and 2, pulse shaper 3, trigger 4, switch 5, keys 6 and 7, counters of quantizing pulses 8 and 9, coincidence circuit 10, delay lines and and 12, period counter 13, generator 14 and prohibition circuit 15.

Input voltages are supplied to keys 1 and 2. Trigger 4 is in one steady state and holds key / open, and key 2 is closed. One of the input voltages through the key / enters the pulse shaper 3, the pulses of which are fed to the coincidence circuit 10 and to the counter of the number of periods 13. The circuit 10 is activated and one of the reference pulses of the generator 14 coincides with the pulse of the imager 3. At the moment of coincidence arriving at the switch a, opens the period counter 13 and transfers trigger 4, connecting another input voltage to pulse generator 3. The same impulse from the switch 5 opens the key 6, 7 and the counters 8, 9, to which quantizing pulses are received from the generator 14.

At the moment of coincidence of the pulse generated from the second input voltage, with

the pulse of the generator 14, from the output of the coincidence circuit 10, removes another pulse, which, having passed the switch 5, closes the key 7, stopping the arrival of the quantizing pulses in the counter 9. Thus, the counter corresponding to several periods and phase shift is generated in the counter 9. The same pulse transfers trigger 4 to the initial state, closes key 2 and opens the key /, supplying the first input voltage to the coincidence circuit 10. When one of the quantizing pulses coincides with one of the input voltages, the third pulse is removed. through switch 5 closes key 6, terminating

the access of quantizing pulses to the counter 5. At the same time, the same pulse blocks the driver 3 and, through the delay lines 11 and 12, supplies the information from the counters 8 a 9 to the PC. Circuit 15 is closed, and counter 13

starts counting periods only with the arrival

of the first impulse of the input voltage and ends with the arrival of the third impulse.

Subject invention

Digital phase meter for measuring the average phase shift value, containing input electronic switches, the control inputs of which are connected to the trigger outputs, and the outputs to the pulse shaper, a switch, two outputs of which are connected via keys and delay lines to the pulse counter inputs, respectively, and a generator quantizing pulses, the output of which is connected to the electronic inputs

the keys controlling the operation of the counters, characterized in that, in order to exclude the starting error, reduce the quantization error and count the number of starting and stop pulses, it is equipped with a period counter, a prohibition circuit and a coincidence circuit, the input of which is connected to the output of the pulse former, to the trigger input, the switch input and the prohibition circuit input, and the last output and the pulse driver output are connected to the input of the period counter, while the other input of the coincidence circuit is connected to the quantum output generator pulses.