SU361447A1 - DIGITAL DIFFERENTIAL PHASOMETER - Google Patents

Description

The invention relates to a phase-measuring technique and can be used to measure phase angles and phase deviations with respect to any initial angle, as well as in systems of automatic control by phase coordinates.

Digital phase meters are known that contain automatic switches, phase detectors, adders, transducers, reversible counters, and clock generators based on the periodic conversion of phase-matched voltages. The disadvantages of these devices are the low accuracy of measurements at high frequencies and the impossibility of determining phase deviations relative to the initial angle.

The aim of the invention is to improve the accuracy of measurements of phase angles and phase shift deviations relative to the initial angle.

This goal is achieved by the fact that the phase meter is equipped with a Pulse 01B splitter, which is a two-bit binary pulse counter, whose input is connected to a clock generator and the outputs of the first trigger are connected to the control inputs of an automatic switch and a reverse pulse counter, a register with digital indication, which inputs associated with the outputs of the multi-bit pulse2.

matching the potential of the matching circuit connected by potential inputs to the code outputs of the reverse pulse counter n pulsed - to the bullet output of the second trigger of the pulse distributor, digital-to-analog converter, auxiliary register output output and a voltage output terminal through a switch whose control input is connected with the output of a potential coincidence circuit whose inputs are connected to the zero output of the first and a single output of the second trigger of the pulse distributor and m a scaling unit with a switchable transmission coefficient, including 1 between the output of the adder is unloaded and the input of the voltage converter into the number of pulses and the connected control input to the zero output of the second trigger of the pulse distributor.

In addition, in order to provide a follow-up measurement mode, the device is equipped with two triggers, the counting input of the first of which is connected via a toggle switch to the unit output of the second trigger of the pulse distributor, its unit output is connected to the unit input of the second one, and the unit output of the latter is connected to a single input of the second trigger of the pulse distributor.

The drawing shows the functional diagram of the proposed digital differential phase meter.

The device contains an automatic switch 1, a phase detector 2, a voltage adder 5, a scale unit 4 with a switchable transmission coefficient, a voltage converter 5 into a number of pulses, a reversible counter 6 pulses with a digital indication 7. The code outputs of a reversible counter 6 pulses through a multi-bit pulse -potential coincidence circuit 8 is connected to the register 9, the output of which includes the display unit 10 and the digital-to-analogue converter U. The output terminal of the digital-to-analogue converter via key 12, controlled output 1m by the signal of the potential coincidence circuit 13, connected to the second input of the voltage adder 3. The operation of the entire device is synchronized by the generator 14 clock | Pulse output by means of the pulse distributor U5, consisting of the 16 and 7 triggers, connected according to the binary counter . To block the switching of the trigger / 7, there is a trigger 18 and triggers 19 and 20.

One of the phase-compared evaporations U is continuously applied to the input of the phase detector 2. Both voltages are applied to the second input via an automatic switch / Y and Phase detector 2 converts the phase shift to the voltage supplied by the voltages to the proportional voltage direct current. Such a detector usually contains a trigger circuit or a matching circuit and a low-pass filter for extracting the average value of their output voltage.

As a result, the difference in the output voltages of the phase detector 2 to adjacent switching cycles is proportional to the measured phase shift and does not depend on the nonidentity of the phase characteristics of the conversion channels of the phase detector.

The measurement cycle consists of four cycles. By the beginning of the cycle, both the trigger of the pulse distributor / 5 pair ms in a single position, the reversible counter 6 and the register

9- at zero. With the arrival of the first pulse from the clock pulse generator 14, both triggers of the pulse distributor 15 are transferred to the zero position. In this case, the automatic switch / connects the voltage Hz to the second input of the phase detector 2, the reversible counter 6 is switched to the adding mode, and the transfer coefficient K is set in the scale unit. At the input of the converter 5 of the L-sion, the voltage 6 / CiS (f. -F ip), where 5i is the slope of the phase detector;

 and 4ср - respectively measured phase angle and ADDITIONAL, REMOVAL

The identity of the channel characteristics of the phase detector 2.

The same pulse, but with some delay (not shown in the drawing), triggers the voltage converter in the number of pulses and the number of pulses () is recorded in a reversible pulse counter (here 52 is the slope of the converter 5).

The second pulse of the generator 14 causes the trigger 16 in a single position. By this, the voltage U is connected to the second input of the phase detector, and the counter 6 is switched to the subtraction mode. The output voltage of the phase detector 2 (U KiSi p) is converted similarly to the first clock cycle. By the end of the second measure in the counter

6 contains the code N - n-n KiSiS2 P, (the result of a rough measurement).

With the arrival of the third pulse from the generator 14, the trigger 16 goes into the zero position, and / 7 - B unit. The voltage drop from the bullet output of the trigger / 7 affects the pulse input of the coincidence circuit 8 and the scale unit 4. In this case, the Al code is rewritten from counter 6 to register 9, after which counter 6 is reset to zero, and the scale factor sets the transfer factor KziKz Ki). The code rewritten in register 9 is displayed in the display unit 10 and is converted to the UK voltage by a digital-to-analog converter. Here a y-t; slope conversion; L | Oz

calling digital-analog converter 11. Since in this cycle the signals from the bullet output of the trigger 16 and the single output of the trigger 17 coincide, the coincidence circuit produces a voltage that opens the key 12, and an output voltage U ,. the digital-to-analog converter // is fed to the second input of the accumulator 3.

Its polarity is chosen opposite to the polarity of the output voltage of the phase detector 2. At the input of the converter 5, a voltage U is set. K.-2, - Fg, where Pgr is the result of a rough measurement. This direction is converted to the number of pulses rt / C2Si52 (x -), which are counted by a reversible counter 6.

The fourth impulse of the generator 14 sets the trigger 16 to one state. In this case, the key 12 disables the output of the digital-to-analog converter 11 from the adder 3, and a conversion occurs that is similar to the second cycle (n KzSiS p). By the end of the fourth cycle, the code - / CiSiSs ((f ,, .- rp) will be fixed in the reversible counter. The counting is performed on the display unit 10 (the main part of the angle) and 7 (the remainder or deviation). The transfer coefficient of the scale unit K-2 is selected in such a way that the width of the reversible pulse counter is most fully used 6.

In the next mode of operation, the / 5 toggle switch is closed. In this case, the first overflow pulse of the pulse distributor 15 converts the trigger 19 into a single state. The first measurement cycle occurs as described above. The second pulse of the pulse distributor overflow converts the trigger 19 to the zero position, which in turn sets the trigger 20 to one. The output of the trigger 20 fixes the trigger 17 in a single position, and further measurements occur in two cycles.

Subject invention

Claims (2)

1. A digital differential phase meter containing an automatic switch, a phase detector connected in series, a voltage accumulator, a voltage to pulse number converter and a reversible pulse counter with digital indication, and a clock pulse generator, characterized in that, in order to improve the accuracy of phase measurements angles and deviations of the phase shift relative to the initial angle, it is equipped with a scale unit, an electronic key, a digital-to-analog converter, a register with digital indication , potential and multi-bit pulse-potential coincidence circuits and a pulse distributor, 1 executed from two triggers according to a binary counting scheme, whose input is connected to a clock generator, the outputs of the first trigger are connected to the control inputs of an automatic switch and a reversing pulse counter, and (the outputs of the second the trigger is connected to the potential inputs of the soyaadeni circuits and the control input of the scale unit; the input of the register with digital indication is connected to the output of the multi-digit name ulsno-potential coincidence circuit, pulse inputs connected to the outputs of the code-down counter, the register output is coupled through a digital-to-analog converter with an electronic key input, a control input coupled to an output of matching circuit potential, and the output of the key is connected to another input of the voltage adder, while the scaling unit with a switchable transfer ratio is connected between the output of the voltage adder and the input of the voltage converter to the number of pulses, the control input of which is connected to the output of the clock generator. 2. A device according to claim 1, characterized in that, in order to ensure the following mode measurements, it is equipped with a toggle switch and two additional triggers, the counting 1 input of the first of which is connected via a toggle switch with a single output of the second trigger of the pulse distributor, its single output connected to a single input (the second, and the single output of the latter is connected to the single input of the second trigger of the impulse distributor. .one.