SU654912A1 - Device for measuring error value of phase calibrators - Google Patents

Description

one

The invention relates to a phase-measuring technique and can be used to assess the accuracy of phase calibrators at scale marks spaced apart one from

ZbO, friend by value (where n is integer

number).

A device is known for measuring the error values of phase calibrators, drying, which enables instrumental multiplication of phase shifts.

The device contains a phase meter, shapers of short imiuls, corresponding to zero-crossing times, pulse-phase detectors, tunable generator and phase-locked loop system, low-pass filters and balanced phaser, actor 1.

However, such a device does not provide high accuracy in measuring the error of the phase calibrator, since, besides the error of the phase meter, errors arise due to parasitic connections between the multiplier channels at the intermediate frequency, the frequency of the local oscillator, and the input signal.

A device for measuring the error values of phase calibrators, comprising a phase meter and two rotary phase shifters, is known. One of the phase shifters is equipped with a vernier reading device for

Fixed position settings 2.

This device is the most

close to the invention according to

technical result and the achieved result.

The accuracy of the measurement error of this device is higher than that described above. Its disadvantage is the greater laboriousness of the verification process, since a large number of operations are required to measure the error values at each mark of the scale of the phase calibrator.

The aim of the invention is to automate the measurement process.

This is achieved by having a device comprising a phase meter, a phase shifter and a phase calibrator, the first input of which

connected to the first input of the phase shifter, and the output of the latter to the first input of the phase meter, equipped with two indicators of zero phase shift, two triggers, a start block, logic gates And

p OR and logic processing unit, the first input of which is connected to the first output of the phase meter, and the second - to the output of the start-up unit, the first input of the first trigger and the OR element, the second input of which is connected to the output of the AND element,

the first input connected to the first input of the second trigger and the output of the first zero phase shift indicator, the second input of the element I - with the output of the first trigger, its second input connected to the output of the second bullet phase shift indicator, the inputs of which are connected to the outputs of the phase calibrator, while the second output of the latter is connected to the first input of the first zero phase shift indicator and the second input of the phase meter, the third input of which is connected to the input of the phase calibrator and the output of the OR element, the output of the phase meter - a second input of the second flip-flop, its output connected to the second input of the phase shifter, the output of which is coupled to the second input of the first indicator zero phase shift.

The drawing shows a block diagram of the proposed device.

The device contains a phase calibrator 1, a phase splitter 2, a phase meter consisting of a phase converter - code 3 and master circuit time 4, zero phase shift indicators 5 and 6, triggers 7 and 8, start block 9, logic processing unit

P

10 that implements the functions Ai Ii-And / / l,

logical element AND 11 and logical element OR 12.

The device works as follows.

The starting block 9 generates two pulses. The first installation pulse prohibits the operation of logic processing unit 10, sets phase calibrator 1 and phase shifter 2 to zero phase shift, trigger 7 to the state prohibiting the operation of the phase shifter, and trigger 8 to the state prohibiting the passage of pulses from the zero phase indicator shear 5 through the element And 11. The installation process proceeds as described below the working cycle.

The second working impulse, which appears at the output of the start-up block 9 as a result of a certain period of time determined by the number of points on the scale of the phase calibrator 1, is the enable signal for the logic processing unit 10. This pulse sets the trigger 8 to the state opening element and

11, and goes through the OR element 12 to the control input of the phase calibrator 1. As a result, at the output of the phase calibrator 1, a phase shift is established, corresponding to the first calibrated mark of its scales. The impulse from the output of element 12 also enters the input time of the driving circuit 4 of the phase meter, which gives the pulse "Start," and the phase meter begins the measuring process, at the end of which the indication 1 goes to the logic processing unit 10. The pulse "Stop stop of the pulse is fed to the trigger input 7 ,

sets it to the state permitting the operation of the phase shifter 2, the phase of the output voltage of which begins to change. This change happens to those

then, until a phase shift 5e at the input of the zero phase shift indicator is established, a phase shift equal to zero. After that, at the output of indicator 5, a pulse appears, which sets the trigger 7 to the state

prohibiting the operation of the phase shifter 2, and passes through the elements AND AND AND OR 12 to the control input of the phase calibrator. At the output of the phase calibrator, a phase shift is established, which corresponds to the second point to be checked, its scale 2a. Next, the pulse from the output of the element OR 12 is supplied to the time setting circuit 4 of the phase meter, in which the measuring process begins. Phase meter reading / 2 arrives

in the logical processing unit. Then the flip-flop 7 turns over, phaser 2 starts to work, a pulse appears at the output of indicator 5, which prohibits the operation of the phase-shifter and arrives at the balance input of the phase calibrator, etc. for (n-1) times.

The last time at the output of the phase calibrator is the phase shift of the output voltages, corresponding to

At the last point of his scale, the phase meter records the reading / “, which goes to the logic processing unit. A pulse appears at the output of the zero phase shift indicator 6. This pulse sets the trigger 8 to the state prohibiting the pulse propagation from the zero phase shift indicator 5 to the control input of the phase calibrator through element 11. The pulse "Stop time of the master circuit 4 overturns the trigger 7 and thereby enables the phase shifter 2. When on A zero phase shift is established at the input of indicator 5, a pulse is output at its output, which sets the trigger 7 to the state prohibiting the operation of the phase shifter 2. The output pulse of the indicator 5 does not go to the input of the control of the phase calibrator goes, because the element And 11 is closed. Thus, the measurement cycle of the error values at the n marks of the scale of the phase calibrator 1 is completed. In the logical processing unit 10, the error values are calculated at each i-th mark of the phase warp scale

GO calibrator algorithm Aj / i-2 / d // g.

k l

The device stops working before receiving a signal from the trigger unit.

When a pulse is applied to the control input of the phase calibrator, each time the phase shift of the output voltages of the phase calibrator is incremented by the value of Рг, which differs

Claims (2)

from the true value of a to an amount equal to the error of the phase KaviHdparopa at the rth mark of its scale Dg, i.e. - a + D ;. The reading of the phase meter li, which enters the logical processing unit, differs from the phase shift at its input p, by the value of the phase meter error at the a mark on its scale,. Therefore, + Df,: .za-f Df ,,. Since for the phase calibrator equality holds, B; - ZbO TO when summing up all the readings of the phase meter is obtained 2 / & 360 + / gLf .. So, the error of the phase meter at the a mark of its scale is equal to ti Аft l Df. 7., and, according to (2), the error of the phase calibrator at each (-th point of its scale is determined by the size difference /; -a and the error of the phase meter, i.e., the proposed device automates the process of measuring the error values of the phase calibrators, which reduces the laboriousness of this process and reduces the measurement time. 5 10 15 20 25 30 35 40 45 6 The invention A device for measuring the error values of phase calibrators containing a phase meter, a phase shifter and a phase calibrator, the first output of which is connected to the first input ohm phase shifter, and the output of the latter with the first input of the phase meter, the first one with the fact that, in order to automate the measurement process, two zero phase shift indicators, two triggers, a trigger unit, logic elements And PLI n logic processing unit, the first input of which is connected to the first output of the phase meter, and the second - to the output of the charging unit}, the first input of the first trigger and the PLP temperature, the second input of which is connected to the output of the And element, the first input connected to the first the input of the second trigger and the output of the first ind the zero phase shift key, the second input of the element P - with the output of the first trigger, its second input connected to the output of the second zero phase shift indicator, whose inputs are connected to the outputs of the phase calibrator, while the second output of the latter is connected to the first input of the first zero phase shift indicator and the second input of the phase meter, the third input of which is connected to the input of the phase calibrator and the output of the PLP element, the output of the phase meter to the second input of the second trigger, its output connected to the second input a phase shifter, the output of which is ev with a second input of the first zero phase shift indicator. Information sources taken into account in the examination of 1-Westpeek of the Kiev Polytechnic Institute. Ser. Automation n electrical equipment, 1973, no. ten. 2. Mayevsky, S.M., Baturevich, E.K., Methods for Accuracy of Phase Calibrators. Herald CAT. Ser. automation and electrical equipment, 1973, vy. ten.