SU447640A1 - Full-wave digital phase meter with a constant measuring time - Google Patents

Description

(54) TWO-HALF-PERIOD DIGITAL PHASOMETER WITH CONTINUOUS MEASURING TIME

I

 The invention relates to a radio measuring technique.

Two-phase digital phase meters with a constant measuring time are known, containing a shaping device consisting of amplifiers-limiters, pulse shapers on the transitions of the zero voltages under study, and controlled triggers forming phase intervals, coincidence circuits, SE OR circuit, counter pulses, the first and second sequence formers

180 - between the counting pulses with a shift, the limiting circuit of the measuring time, made in the form of the master 19 generator, the divider part of the counting pulses, the trigger and the coincidence circuit.

In phase meters of this type, there is a dead zone near zero, which makes it impossible to measure small angles, as well as a 20 set zero phase meter when the same voltage is applied to both inputs.

The purpose of the invention is to measure map angles and their direct indication in degrees, 25

I For this, in the proposed device, one of the channels of the forming device is equipped with a switch at the input of controlled triggers, as well as a third pulse sequence generator,

shifted by 90 ° relative to the counting pulses of the first and second drivers, and the input of the third driver is connected to the inputs of the first and second forms. worlds, and the output through the same switch - with the OR circuit. ; The drawing shows a block diagram I of the proposed full-wave digital phase meter with a constant measurement time.

The circuit consists of a shaping device, in which the input of limiter amplifiers 1 and 2, pulse formers 3-6, and controlled triggers 7 and 8 {coincidence circuits 9 and 1O; scheme OR 11,: counter AI / pulses 12; the first 13 and second 14 shapers of a sequence of counting pulses with a shift of 180 between them; driver 15 pulses of the signal shifted by 90

; Scheme; We match the lej of the master oscillator i7, the frequency divider 18, and the trigger 19./ The circuit works as follows. Input signals are U-. and {) limit. . the amplifiers 1 and 2 are amplified with and, a. then, from these signals with the C-b generators, pulses are generated in the transition time of the studied voltages with a zero voltage both positive and JB in the negative direction. The generated pulses switch controlled triggers 7 and 8, which form the phase interval (switch P in position 1) .; In coincidence 9 and 10 schemes, the phase entrums are filled with quantizing pulses. Through the OR 11 circuit, these pulses arrive at counter 12. Two sequences of quantizing pulses shifted by half a period from the formers 13 and 14, f are fed to the inputs of circuits 9 and 10. The master oscillator 17 generates counting pulses fed to the input of the coincidence circuit 16. The divider 18 of the counting pulse frequency and the trigger 19 limit the measurement time. Thus, oscillations of the master oscillator are received from the circuit 16 to the formers 13, 14 and 15 during the measuring time. To eliminate the dead zone near the zero phase shift, the switch is set to P. When the atom at the input of controlled triggers, cross-switching of pulses is introduced, corresponding to zero-paths from positive to negative and from negative to positive. This introduces a 180 shift with no errors due to the asymmetry of the constraint. Let the same signal on both inputs of the phase meter and let Sp be the phase angles of the input signal, which in the first l of the second channel generate pulses corresponding to zero transitions of the input signal from minus to plus. Then, the corresponding pulses in the zero transitions of the input signal from the plus to the minus will be formed at the phase angles of the input signal (180-C) and (180 ° -C). Phase intervals D and; DC), formed by phase meters on zero transitions from plus to minus and from minus to plus, when cross-switching in one of the channels is: „180 °) - ф 2 1, 1 360 ° + 180 °, Sughetche phase meter is equal to Д-Р ,. 6, In order for the counting on the counter when measuring small angles to be directly in degrees, a sequence of pulses shifted relative to the pulses from the formers 13 and 14 by 90 ° is fed to the OR circuit 15, which is equivalent to the addition of 18O. Thus, if you make a reset in the meter when it reaches 36 °, the meter will directly show a small angle. The subject matter of the invention. . . , Full-wave digital phase meter with; Simple measuring time, Containing a shaping device, consisting of amplifiers-limiters, pulse shapers and controlled triggers, coincidence circuit, OR circuit: pulse, first and second pulse shaper, pulse sequence, counting pulses with a shift of 180 ° between them, a measuring time limiting circuit made in the form of a master oscillator, a counting pulse frequency divider, a trigger and a coincidence circuit, characterized in that Measurement of small angles and their direct indication in degrees, ONE of the channels forming the device with a switch at the input of the controlled triggers, as well as the third generator of the spiral sequence shifted by 9O with respect to the counting pulses of the first and second formers, and the input of the third the driver connects to the inputs of the first and second drivers, and the output through the same switch is connected to the OR circuit.