SU682844A1 - Digital trigger phase meter - Google Patents

Description

the running time of the controlled trigger. Trigger-dividers are synchronized in a pause between measurements, which excludes their malfunction at angles close to 180 °, which increases the noise immunity of measurements. At the same time, the exclusion of the dead zones in a given phase meter is sonored by dividing the signal frequency into two, which leads to an increase in the discrete conversion error at low frequencies due to the short measurement time and the period of the studied signals. The aim of the invention is to improve the accuracy of measurement of digital 15 phase meters at low frequencies. This goal is achieved by the fact that a digital phase meter containing sequentially connected forming devices and trigger dividers of the first and second channels, a controlled trigger, a trigger trigger dividers synchronization unit connected to the trigger trigger of the second channel by a splitter pulse generator and 25

successively connected pulse counter and coincidence element, one of the inputs of which is connected to the time of master unit, is equipped with four transfer devices in each channel, three additional controllable triggers, four electronic switches, pulse distributor and four-input element OR whose inputs are connected to the outputs electronic keys, and the output - with the element of connections; in this case, one of the inputs of each of the introduced transfer devices is connected to the trigger dividers, and the other with the forming devices the first and second channels, each of the four controllable triggers, one input is connected to the output of the corresponding transfer device of the first channel, the other to the output of the specified second channel device, and output to the corresponding electronic key, the second input of which is connected to a pulse distributor connected simultaneously to the generator of pulses and to the time of the master unit, the output of which is connected to the first input of the synchronization node of the trigger-dividers, and the second input of the above-mentioned node is connected with them from the first channel transfer devices.

The block diagram of the digital phase meter is shown in the drawing.

Phase meter contains forming devices 1 and 2, trigger-frequency dividers 3 and 4, transfer devices 5-12, synchronization unit of trigger-frequency dividers 13, controlled triggers 14-17, pulse generator 18, electronic switches 19-22, pulse distributor 23 , element OR 24, time specifying unit 25, element of coincidence 26, counter with indication 27. 5 10 20

positive and negative zero-transitions of input signals with the following frequency F12, which trigger the controlled triggers 14-17, which form four phase intervals for the period of the plots into two frequencies of the signal. As a result, information about the measured phase shift is extracted in each period of the input signal and there is no decrease in measurement accuracy associated with an increase in the discrete conversion error at low frequencies due to dividing the two frequencies of the input signal. Next, the phase intervals are received by electronic switches 19-22, where they are filled with time-overlapping sequences of pulses obtained using pulse distributor 23. Pulse bundles from electronic keys 1B-22 are combined on the OR element 24 and fed through the coincidence element 26 to the counter pulses with indication 27.

A comparative estimate of the ncfrequency error showed that in the proposed phase meter, this error is reduced by about 10 times compared to the prototype. The latter can also be used to reduce the measurement time by a factor of 10 with the same measurement accuracy and thus increase labor productivity when working with this phase meter; expand its technical capabilities.

Claims (2)

Invention Formula A trigger digital phase meter containing sequentially connected forming devices and trigger dividers of the first and second channels, controlled. The signals under study, the phase shift between which is to be measured, arrive at the forming device, devices 1 and 2, where they are converted into a sequence of short pulses linked to positive and negative null transitions, input dgs. Nomosh, synchronized triggers, dividers 3 and 4, eliminates dead zones when measuring small angles or angles close to 360. Synchronization of one of the trigger frequency dividers (in this case, 4) is dried, and imposes an impulse to negative zero. the transition of the first channel from the output of the transfer device 7 impulses. The synchronization node of the trigger-frequency dividers 13, controlled by time by the driver unit 25, turns off synchronization for the measurement time, which eliminates the possibility of failures of the synchronized trigger-divider of the frequency at phase shifts close to 180 °. The transfer devices 5-8 and 9-12 in each channel allocate four sequences of short pulses of attachment to a trigger, a trigger splitter synchronization node, connected by an output to a trigger splitter of the second channel, and one of the inputs with a time master unit, a kmnulse generator and a successively connected pulse counter with indication and a matching element, one of the inputs of which is connected to the time master unit, is ich and w, and so that, in order to improve measurement accuracy in the low frequency region, it is equipped with four transfer devices in each channel, three additional controlled triggers, four electronic keys and, a distributor of pulses and a four-input OR element, whose inputs are connected to the outputs of electronic keys, and the output - to a coincidence element, while one of the inputs of each of the input transfer devices is connected to the trigger splitters, and the other to the forming devices of the first and the second channel, each of the four controlled triggers one input connected to the output of the corresponding device to transfer the first channel, the other to the output of the specified device of the second channel, and the output to the corresponding electronic key, a second input coupled to a pulse distributor, to simultaneously iodsoedipennym to the pulse generator and to the time of the master unit, the output of which is connected to the first input of the synchronization node of the trigger-dividers, the second input of the above-mentioned node is connected to one of the devices of the first channel channel. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 447640, cl. G 01R 25/00, 1975. 2. USSR author's certificate number 257616, cl. G 01R 25/04, 1969.