SU1228039A1 - Apparatus for measuring phase shift - Google Patents

Abstract

The invention can be used to: measure the phase difference between two sinusoidal signals. The purpose of the invention is to simplify the device. The device contains a pulse shaper 1, a shaper of 2 short pulses, a shaper of 3 pulses, a shaper of 4 short pulses, trigger 5 with separate inputs, electronic key 6, generator 7, electronic keys 8, 9, reversible counter 10, delay element 11, counting trigger 12, element OR 13. Simplification is achieved due to the introduction of the counting trigger 12 and the element OR 13 instead of the excluded. one shaper, two delay elements, a counter for the pulses and an adder. 1 il. S (l

Description

one

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

The purpose of the invention is to simplify the device.

The drawing shows a block diagram of a device for measuring phase shift.

The device contains the first driver 1 pulses and connected to it the first driver 2 short pulses, the second driver 3 pulses and connected to it the second driver 4 short pulses, trigger 5 with separate inputs output connected to the input of the first electronic key 6, generator 7, second 8 and third 9 electronic keys, reversible counter 10 and element

11 delays as well as a counting trigger

12 and the element OR 13.

The device works as follows.

The inputs of the first 1 and second 3 pulse formers receive signals of the same frequency, the phase shift between which is to be measured. The output of the formers 1 and 3 form square-shaped signals, which are received respectively at the first inputs of the second 8 and third 9 electronic switches, to the second inputs of which impulses come from the output of the counting trigger 12 operating as a divider at 2 pulse frequencies of the generator 7. At the output Keys 8 and 9 are bursts of pulses. The difference in the duration of these packs is equal to twice the phase shift caused by changes in input signal levels as they pass through the shaper 1 and 3. Due to the introduction of a counting trigger 12, which divides by 2, the difference in the number of pulses in the packs is equal to the numerically occurring phase shift. To count the difference in the number of pulses, in bursts from the outputs of the electronic switches 8 and 9, the pulses are sent to the summing and subtracting inputs of the reversible counter 10. To ensure that the reversing counter 10 provides the necessary time division and summation of the subtracted pulses, the bursts of pulses are fed to the second inputs of the keys 8 and 9 respectively with

direct

five

and inverse outputs of the counting trigger 12.

In addition, from the outputs of the formers 1 and 3 pulses, the signals arrive at the inputs of the formers 2 and 4 short pulses, the output of which produces short pulses that coincide: they give in time with the leading edges of the pulses of the formers 1 and 3. These short pulses go further on trigger 5 with separate inputs, at the output of which a pulse is formed whose duration is proportional to the phase shift between the input signals with the phase shift added to it, depending on the input signal levels. From the output of the trigger 5, the pulse arrives at the first electronic key 6, to the second input of which pulses are received from the generator 7. At the output of the first key 6 a burst of pulses is formed, which is delayed by the delay element 11 and further through the OR element 13 it takes 5 seconds to the summing input reversible counter 10. As a result of the presence of a delay, there is a discrepancy in the time of the pulses arriving at the inputs of the element OR 13, and their summation in the counter 10.

Thus, during the measurement period, the reversible counter 10 generates a code proportional to the phase shift measured, and the measurement results are corrected for the phase shift caused by a change in the input signal levels. In addition, a simplification of the device for measuring the phase shift has been achieved.

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Claims (1)

Invention Formula A phase shift measurement device comprising a first pulse generator connected in series, the input of which is the first input of the device and a first short pulse driver connected in series to the pulse forming device whose input is the input of the device and the second driver of short pulses, the outputs of the first and the second short pulse drivers are connected to the trigger inputs with separate inputs, the output of which is connected to the first input of the first electronic key, The second input of which is connected to the output of the generator, and the output - to the input 312280394 the delay element, the outputs of the first IR is connected to the output of the generator, and The second pulse shaper co-its outputs, direct and inverse dinene with the first inputs, respectively, with the second inputs, respectively, of the second and third electronic key and third electronic keys, Whose, the output of the second electronic key 5 output of the last of which is connected connected to the second input reversing the first input element OR, the second a counter, the input of which is connected to the output by a letter, which, in order to simplify the delay device, and the output is connected to the first host, a counter counter with the trigger of a reversible counter, the output of which is the OR element, the input of the counter trigger, is entered into it .