SU421947A1 - - Google Patents

Description

The invention relates to the field of phase-measuring equipment and can be used when creating digital phase meters and increased accuracy.

Known digital phase meters containing input shaping devices, triggers, key circuits, a quantum oscillator, a frequency divider and a counter, have significant measurements:

The purpose of the invention is to improve the accuracy of measuring the presence of noise.

This is achieved by the fact that the phase meter is equipped with a circuit for correcting measurement results, a block analyzing the range of values of the measured phase shift and the uiravleia circuit by the converter of the analog code, the input of KOTopoii is connected with the output of one of the drivers of the converter of the analog code, and the output is the control input of the other driver and counter. The inputs of the ana block are: i-1 for the node. They are connected to the outputs of the first three decades of the counter, its output is connected to the control input of the uiravlein driver, the inputs of the correction circuit are connected to the output of the last two decades of the counter and the output of the user of the analog-code receiver, and the output of the correction circuit 1I1 and the keys to the inputs of the last two decades of the counter.

The drawing shows a block diagram of the phase meter.

Phg.zometer contains a trigger converter analog-code /. including shaping devices 2 and 3, controlled trigger 4, quantizing generator 5, splitter splitter, trigger 7, key circuits 8, 9, counter 10, circuit manager, m, e, and 1, y10 of trigger 12, 13 and 14, to: pochovye schemes 15, 16, block / 7 analza of the range of values of the measured phases, including the IS scheme, 19 each, key scheme 20, scheme “OR 21, trigger 22, and scheme 23

Sovnandeiiy and klyucheFazol1etr works as follows.

The lia inputs of the phase meter feed the ignition, the phase shift between which the premont is measured. For: 1ir1: e devices 2, 3 select: 10m 1T1s1 and positive zero transitions of input diameters; and form short impulses in this molar. Under the influence of the Aimulso B, the controlled trigger 4 produces square-wave pulses, the duration of which is proportional to the palpable phase shift. In the key scheme S ept, the pulses are quantized by the pulses of the geerator 5 and their packs are passed to the counter 10 through the key .9 for a measuring time forshared by the divider () time and

trigger 7 from oscillations of a quantizing generator 5.

In the first period of the input queue, the region is determined in which the measured fazsrg shift falls. If in the counter 10 there is a recorded number lying in the interval O – L -,; ,,;, where L. „„ „corresponds to MitsV in digital form, a voltage appears at the output of the coincidence circuit. In other situations, circuit 18 matches voltage out. The coincidence circuit 19 produces a voltage in the event that the counter 10 has a number, in the interval Lmax-L m., (D о --- 360 ° corresponds to the phase shift 360 ° expressed in digital form; L, accepts -rmax, also expressed in digital form). With other numbers recorded in the counter 10, the circuit 19 does not issue an impurity.

In the absence of a blind in the 10 L ,,,,,,,, I counter, the trigger 22 is thrown and the key circuit 20 is closed. Thus, if the situation is f.viaKc x Miiii, then the output of the R1LP 21 circuit has a resolution nia deniouuiii and potential. The analysis of the region in which d- fell out is carried out by a pulse on 4a; ia ne) iodine, it is triggered by a trigger

12. The impulse of this trigger goes through.; L | () chevuk) circuit 15 n flips trigger

13, which closes key 15 for the remainder of the measurement time. Due to this, the impulses of the beginning of the next 1x even periods

They may distort the result. Measured: -.

In the event that the output potential of the circuit OR 21 is permissive, the key circuit 15 opens and releases the analysis pulse. This imiule throws the trigger 14, which leads the forming device 2 to the selection mode of negative zero transitions, resets the pa and the younger decade of the counter 10, writes the / in the older decade, and writes down the older decade to 8. This is equivalent to increasing the final result by 180 ° in order to take into account the 180 ° angle introduced into the measured phase shift and the separation of

421947

zero transitions on the first input.

In counter 10, by the end of the measurement a number greater than 360 ° can accumulate. To eliminate this, a joint scheme 24 and a key scheme 25 are introduced. The instant in the two decades of the decade 10 of the number 36 is highlighted by the coincidence 24 scheme, which opens the key exem 25. The first quantizing impulse at the input of the counter 10 after that passes through the diagram 25, Drops two senior decades on bullets.

While large phase shifts of 360 ° are measured, by the beginning of the second period, the key circuit 16 is opened by the voltage from the output of the coincidence circuit 19. In this case, similar contradictions take place, but the selection of negative zero transitions in the second channel in this case is equivalent to a decrease of 180 °. The counter is reset to zero, and the number 18 is recorded in the two senior decades. Counter redefinition by the end of the measurement: f is happening.

Subject from b ete and and

A digital phase meter, content-1, and an analog-code trigger converter consisting of two pulse shapers, triggers, and a key whose output is: connected to a counter, characterized in that, in order to increase the accuracy of measurements and the presence of Iums, , by the unit of analysis of the range of values of the measured phase shift to the scheme of the averaging of the analog-code converter shaper, whose input is the connection with the output of one of the converter shapers of the analog-code converter, and the output from the control of the other input first one: .1vilte :. and a counter, and in this way the inputs 6j; oKa of the analysis 11docl 0chips to the outputs of the first three decades of the counter, its output - to the input of the control circuit of the driver, the inputs of the correction circuit are connected to the outputs of the last two decades of the counter and the output of the analog-code converter, and the output Plug-in correction sub-devices for the last two decades of the counter.

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