Digital meter gear ratio

 

The invention relates to the field of electrogravimetry and can be used for measuring the parameters of amplifiers low and subsonic frequencies, as well as automated control paths passing audio signals. The meter contains two Comparators and two meter intervals. The first comparator compares the output signal of the investigated amplifier with a reference voltage. The second comparator compares the test signal with the reference voltage. To the input of the first measuring time intervals connected the output of the second comparator. The output of the first comparator through a multiplexer connected to the input of the second measuring time intervals. Another information input of the multiplexer through the EXCLUSIVE OR element connected to the outputs of both Comparators. The outputs of the measuring time intervals connected to the input of functional Converter that calculates the gear ratio. The device allows the selection of the operating mode of the meter by switching a multiplexer and additionally to measure the phase shift and frequency of the test signal. 2 C.p. f-crystals, 2 Il.

The invention relates to the field of electrogravimetry and moutaineering control paths passing audio signals.

As a prototype of the selected device containing three Comparators, two amplifiers, two elements with adjustable gear ratio, two subtraction unit and the current-limiting element, the first information input device is the first output of the current-limiting element, the second terminal of which is connected to the input of the first amplifier, which is connected in parallel to the first element with adjustable gain, a control input connected to the output of the first comparator, the first input of which is connected to the output of the first amplifier and the second input is combined with the first input of the second comparator and serves as the second information input device, the second input of the second comparator is connected to the output of the first subtraction unit, the first and second inputs which are connected respectively with the output of the second amplifier and the output of the second comparator, between the input of the second amplifier and the output of the first subtraction unit connected to the second element with adjustable gain control input of which is United with the same input of the first element with adjustable gear ratio, the first input of the second subtraction unit is the input reference voltage of the device, and the WTO is the home of the third comparator and connected to the input of the second amplifier, the first input of the third comparator is connected with its output and the second input with the output of the second comparator [U.S. Pat. Of the Russian Federation No. 1667504, G 01 R 19/10, 1994].

To the disadvantage of the prototype should include its limited functionality, as it only serves to calculate the ratio of two voltages, it can be used only for measuring module gain amplifiers.

Technical result achieved when using the present invention is to extend the functionality of the meter by calculating not only the modulus of the transmission coefficient, and phase shift and frequency of the test signal.

The technical result is achieved by the fact that in the known probe containing two Comparators, the first and second information inputs and the reference input voltage, according to the invention introduced two unit time intervals, the EXCLUSIVE OR element, the multiplexer and functional inverter whose output is the output of the measuring device, the first information input of which is the signal input of the first comparator, the input reference voltage which is combined with the same input of the second comparator and is the reference input of neprezentare connected to the inputs of the EXCLUSIVE OR element, and the output of the first comparator is connected to the first information input of the multiplexer, the output of the second comparator is connected to the input of the first unit of measurement of time intervals, the output of which is connected to the first input of the functional inverter, a second input connected to the output of the second unit of measurement of time intervals, the input connected to the output of the multiplexer, the second information input connected to the output of the EXCLUSIVE OR element, and the address input is the selection of the operating mode of the meter.

In addition, the technical result is achieved by the digital meter gear ratio additionally introduced potentiometer, the average output of which is connected to the combined inputs of the reference voltage of the first and second Comparators, and first and second extreme conclusions connected respectively to the power source and the shared bus.

The technical result is achieved because in the digital meter gear ratio additionally introduced attenuator, the output of which is connected to the signal input of the first comparator and the input of the attenuator is the first information input of the meter.

The invention is illustrated functionability transmission, a in Fig.2 is a timing diagram illustrating the principle of its operation.

Functional diagram according to Fig.1 contains the Comparators 1 and 2, blocks 3 and 4 measurement of time intervals, the EXCLUSIVE OR element 5, a multiplexer 6, a functional Converter 7 and analyzed amplifier 8 with a load resistance RL. The first information input of the meter is the signal input of the comparator 1, and the second information input of the signal comparator input 2, input reference voltage of the Comparators 1 and 2 have been combined and are logREFthe reference voltage meter, the first input of the EXCLUSIVE OR element 5 is combined with the first input DI0 multiplexer 6 and is connected to the output of the comparator 1, and the second input of the EXCLUSIVE OR element 5 is combined with the input of the measurement unit 3 time intervals and connected to the output of the comparator 2, the output of the EXCLUSIVE OR element 5 is connected to the second input DI1 of the multiplexer 6, the address input which is the input M of the selection of the operating mode of the meter, the output of the multiplexer is connected to the input unit 4 measurement of time intervals, the output of which, as well as the output unit 3 is connected to the corresponding inputs of the functional Converter 7, the output of which is output sub>o(t) of the amplifier 8 is connected to the first information input of the meter.

The timing diagram (Fig.2) contain:

- input UI(t)=U1sint and output Uo(t)=U2sin(t+signals with amplitudes U1and U2accordingly, with a frequency ofand shifted relative to each other at the timeand crossing the reference level UREF(Fig.2A);

- pulsest1at the output of the comparator 2 if UREF>0 (Fig.2B);

- pulsest2at the output of the comparator 1 when UREF>0 (Fig.2B);

- pulses with a duration T/2 at the output of the comparator 2 if UREF=0 (Fig.2G);

- pulses with a duration T/2 at the output of the comparator 1 when UREF=0 (Fig.2D).

Given that in the General case, the transfer coefficient K(j)=K()ejis the magnitude of the complex and carries information about both the ratios of the amplitudes and phase shiftthe task of measuring divide into two parts. The first is the calculation of the fashion of the module (gear ratio). The second component of the calculation provides a measure of the time shiftbetween corresponding points on the input and output signals.

The operation of the meter gear ratio (Fig.1) is the following. At the entrance of the investigated amplifier 8 provides a test signal UI(t)=U1sint that simultaneously receives and on the signal input of the comparator 2. On a similar comparator input 1 signal comes from the output of the amplifier 8, i.e. after amplification. As inputs the reference voltage of the Comparators 1, 2 is level UREFwhose value is chosen from the condition 0<U REF<Uand U2U1then from the outputs of the Comparators 1 and 2 will have a sequence of pulses with durationst2andt1respectively (Fig.2B and Fig.2A). The duration of the received pulses associated with the amplitudes U1and U2known relationships [Avanesyan, R. a Method of measuring the amplitude of the harmonic process. - M.: 2002. Hands. Dept. in VINITI, No. 1074-2002, page 3]

Therefore, by measuring the time intervals="https://img.russianpatents.com/img_data/82/821852.gif">

get the search module To the transmission coefficient K(j). The last operation is performed functional Converter 7.

The measurement module To occurs when M=0 to the address inputs of the multiplexer 6 set the logical level “0”. It is necessary to transmit the output of the multiplexer 6 outputs of the comparator 1. As a result, when M=0 to the inputs of units 3 and 4 measurement of time intervals of the received sequence of pulses with durationst1andt2respectively. To measure the phase shift at the input of M sets the logical level “1”, and the reference voltageREFset equal to zero. In this case, the outputs of Comparators 1, 2 will have a sequence of pulses, the duration of which is equal to the half period T/2 of the test signal UI(t) (Fig.2 d, e) and a temporal offsetbetween them will repeat the value of the phase shift between Uo(t) and UI(t), expressed in units of time. To measure the specified time offset of the sequence of pulsesemerging at the output of the EXCLUSIVE OR element 5 through multiplexing> . As a result, in this mode of operation functional Converter 7 is not used, and the result is a numeric codeis withdrawn from the output unit 4. At the output of block 3 will be present code half-cycle T/2 of the test signal.

Functional Converter 7 may be made in the form of an EPROM, implements hardware-tabular method of calculation of the unknown function at a fixedand changingt1andt2. To do this, EPROM pre-record a set of possible outcomes assessment K=U2/U1on the basis of discrete computingt1,t2and the range of their variations.

The sensitivity of the blocks 3, 4 measurement of time intervals to a large extent depends on the selected level UREFand hence UREFdepends on the sensitivity of the device as a whole. For this reason, the meter is useful to provide the control values UREF. This reference voltage to the Comparators 1, 2 can be fed through a potentiometer connected to a source of stabilized voltage. The nature of the dependence of the sensitivity Esmerelda sinusoidal signal, in particular, the output signal of the test amplifier. Therefore, a characteristic feature of the inventive device will be a reduction in sensitivity with the increase of the measured modulus of the transmission coefficient. To reduce the effects of this dependence in the device, it is useful to use a voltage divider (attenuator), attenuating the output signal of the test amplifier. In this case, after the operation of the functional transformation will require to take into account the selected division factor.

Claims

1. Digital meter gear ratio, containing two Comparators, the first and second information inputs and the reference input voltage, characterized in that it introduced two unit time intervals, the EXCLUSIVE OR element, the multiplexer and functional inverter whose output is the output of the measuring device, the first information input of which is the signal input of the first comparator, the input reference voltage which is combined with the same input of the second comparator and an input reference voltage meter, the second information input of which is the signal input of the second comparator, you the first information input of the multiplexer, the output of the second comparator is connected to the input of the first unit of measurement of time intervals, the output of which is connected to the first input of the functional inverter, a second input connected to the output of the second unit of measurement of time intervals, the input connected to the output of the multiplexer, the second information input connected to the output of the EXCLUSIVE OR element, and the address input is the operation mode of the meter.

2. Measure p. 1, characterized in that it additionally introduced potentiometer, the average output of which is connected to the combined inputs of the reference voltage of the first and second Comparators, and first and second extreme conclusions connected respectively to the power source and the shared bus.

3. Measure p. 1, characterized in that it additionally introduced attenuator, the output of which is connected to the signal input of the first comparator and the input of the attenuator is the first information input of the meter.

 

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FIELD: electricity; physics.

SUBSTANCE: method of dielectric losses angle measurement includes filling of measuring capacitor clearance with the observable dielectric and sinusoidal voltage supply to the capacitor. In addition, alternating electrical voltage V is generated. The above mentioned voltage is proportional to the product of capacitor voltage by the capacitor current. The voltage V is converted into two bipolar voltages Vmax and Vmin. One voltage value, for example, Vmax is equal to the peak value of the positive component, while the other value Vmin is equal to the peak value of the negative component of V voltage. Voltages Vmax and Vmin are converted into two direct voltages V1 and V2. One voltage value V1 is equal to the sum of the absolute Vmax and Vmin values. On the contrary, the other value V2 is equal to the difference of the above absolute values. The target value of losses angle sine is derived from the formula Besides, the unit value (or multiple of a unit) for voltage V1 is sought while controlling the produced V voltage. In addition, sinδ value is defined directly from voltmeter indications by measuring V2 voltage.

EFFECT: simple process and increased accuracy of dielectric losses angle measurements within wide frequency interval, possibility of measurements automation.

3 cl, 2 dwg

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