SU1394179A1 - Two-port dynamic parameter meter - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment and allows to expand the field of application of the meter. The meter contains a threshold element 2, a switchable source of 3 reference voltages, a control block 4 and a meter 5 of an informative parameter. The introduction of generators 6 and 7 of linearly varying voltage and controlled frequency expands the range of measurement of the dynamic parameters of four-port networks. 4 il.

Description

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The invention relates to electrical measuring equipment and can be used to measure the dynamic parameters of various quadripoles.

The aim of the invention is to expand the scope by increasing the range of measurement of the dynamic parameters of the quadrupoles.

FIG. 1 shows a block diagram of a dynamic parameter meter quadrupole; 2, time diagrams of his work; in fig. 3 is a schematic diagram of control units; in fig. 4 timing charts of the control unit.

The four-terminal dynamic parameter meter contains terminals for connecting the input and output of the test four-terminal network 1, threshold element 2, switchable source 3 of reference voltage, control unit 4, informative parameter meter 5, linearly varying voltage generator 6, control frequency generator 7.

A terminal for connecting the output of the tested quadrupole is connected to the first input of the threshold element 2 whose output is connected to the first input of the control unit 4, the output of which is connected to the first input of the meter 5 of the informative parameter, the input of the controlled generator 6 of the linearly varying voltage and the input of the source 3 reference voltage, the output of which is connected to the second input of the threshold element 2, and the output of the generator 6 linearly varying voltage is connected to the second input of the meter 5 informative parameter a and an input of a controlled frequency generator 7, the output of which is connected to a terminal for connecting the input of a tested quadrupole 1 and the second input of control unit 4.

The control unit 4 comprises an inverter 8, a D-flip-flop 9, an AND 10 element, an OR 11 element, an RS-flip-flop 12, the first 13 and second 14 resistors, the first 15 and second 16 capacitors, a diode 17 and the first input of the block 4 is connected to the first input the element And 10 and D - input of the D-flip-flop 9, the C input of which is connected to the output of the inverter 8 and the second input of the element And 10 whose output is connected to the S input of the RS flip-flop 12, the R input of which is connected to the output

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the house element 11, the first input of which is connected to the cathode of the diode 17, the first output of the second resistor 14 and the first output of the second capacitor 16, the second output of which is connected to the inverse output of the D-flip-flop 9, the R-input of which is connected to the second input of the element OR 11, the first terminal of the first resistor 13 and the first terminal of the first capacitor 15, the second terminal of which is connected to the power bus, the second terminals of the first 13 and second 14 resistors and the anode of the diode 17 are connected to the ground bus, the input of the inverter 8 is connected to the second input of the unit 4, the output of which is Inonii with inverted output RS-flip-flop 12.

The meter works as follows.

In the initial state, the voltage at the output of the switchable source 3 of the reference voltages is set to the larger of the two reference voltages required to test the quadrupole. The output signal from the control unit 4 starts a controlled oscillator 6 of a linearly varying voltage, the output voltage of which linearly increases.

 At the same time, the duration of the test voltage pulses from the output of the generator 7 of the controlled frequency and the period of their follow-up are also increased. are proportional to the output voltage of the generator 6 linearly varying voltage. When the amplitude of the test voltage pulses at the input of the test quadrupole 1 is constant, the amplitude of the suitable signals depends on the duration of the acting pulse. Since during the measurement the duration of the acting signals increases, the ampere of the voltage pulses at the output of the test quadrupole 1 also increases, and at time t | (Fig. 2 &) reaches level,. In this case, the threshold element 2 is triggered, the control unit 4 issues a command by which a voltage is set at the output of the switching source 3 of the reference voltage (Fig. 2), and the output voltage of the control of the generator of the linearly varying voltage starts linearly decrease (Fig. 2a), as a result, the duration of the test voltage pulses is also reduced (Fig. 25).

In the area of linear decrease in the output voltage of the controlled generator 6, the linearly varying voltage of the test voltage of the quadripole 1 repeatedly (at each successive exposure to the test voltage) exceeds the value U - the voltage at the output of the controlled source 3 of the reference voltage. At the same time, every time

Yes, condition U is met, the threshold element is triggered. Therefore, the control unit 4 is designed so that when operating in the time interval, it outputs a signal to the input of the controlled generator 6 of a linearly varying voltage only when the output voltage of the tested quadrupole 1 is tested

body voltage less than U

condition is met

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(Fig. 7.1,), In this case, the control unit 4 executes the next command, according to which the output voltage of the reference voltage source 3 establishes a reference voltage U, (Fig. 26), and the output voltage of the controlled generator 6 linearly varying voltage begins to increase linearly (Fig. 2a). In the area of the linear increase in the output voltage of the generator 6 of the linearly varying voltage (with a higher U value), the control unit 4 outputs a signal under the condition Ug ,, U. If this condition is met, control unit 4 again issues a control command and all the above processes are repeated. In the proposed meter, the output voltage of the controlled generator 6 of the linearly varying voltage U, (at time t) quantitatively characterizes the value of the front of the output voltage (t.) Of the tested quadrupole 1 from the beginning of the impact until comparison with the reference voltage U, and associated with it by the ratio,, where K is the conversion factor measured;

l 5 and the voltage Ug. (at time t,) is equal to K / 1

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where tx2, is the front value of the output voltage of the tested quadrupole 1 from the onset of exposure to comparison with the reference voltage. The difference of these values

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This characterizes quantitatively the duration of the front 5 (Fig. 2B), enclosed between these two supporting f. voltage u, (ty,) k

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Since the change in the output voltage of the controlled generator 6 is linearly varying in voltage linearly in time, and the speed of change 10 is not constant both with increasing and decreasing voltage, the time interval T (Fig. 2 V) from the output of control unit 4 as well as the voltage difference, quantitatively characterizes the value. In the proposed meter, the relative measurement error G is determined from the ratio G 8 T / K-ty, where S const is the rate of change of the output voltage of the controlled generator 6 of the linearly varying voltage; T is the period of the following pulses of the generator 7 of the controlled frequency; K const - conversion factor

25 meter 5 having a dimension

f;

t., - measured dynamic

quadrupole parameter. Here it is constant and Tj., Therefore, 30 G is also constant when measuring small and large values of t and does not impose any restrictions on the measuring range of the meter.

35

Claims (1)

Invention Formula 40 A four-port dynamic parameter meter that contains terminals for connecting the input and output of the test four-pole network, a terminal for connecting the output of the test four-pole network is connected to the first input of the threshold element, the second year of which is connected to the outputs 45 of the switching voltage source, and the output to the first input of the control unit, the output of which is connected to the input of a switching source of reference voltages and to the first input of an informative parameter meter, characterized in that expanding the application area by expanding the dynamic measuring range, a generator of linearly varying state voltage and a controlled frequency generator, the output of which is connected to the terminal for connecting the input of the tested four-pole network and the second 50 55 u2 and FIG A