SU1242839A1 - Device for measuring and analyzing pulsed overvoltages - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to increase productivity. The device contains n threshold elements 2 and 11, elements And 3 and block 7 information output. Introduction to the device of the input unit 1, n keys 4, memory block 5, electronic switch 6, generator 8 rectangular pulses. % (L to F 00 ss with

Description

element 9, divider counter 10 with a tunable division factor, switch 12 and the formation of new connections between the elements of the device provide automatic measurement of the total duration of the signal under investigation for fixation. The invention relates to electrical measuring technology.

Purpose of the invention; Eni - increase productivity, labor.

FIG. 1 shows the functional 5 on the diagram of the device in FIG. 2 - input signal diagram; 3 is a volt-second characteristic of the input signal; FIG. 4 - signal plots at various points 10 of the device circuit.

The device contains an input unit 1, the input of which is connected to the input of the device, and the output to the inputs n of threshold elements 2, the outputs of which is connected to the first inputs of the corresponding logic elements AND 3 via n keys 4, the outputs of elements AND 3 through memory block 5 are connected to the inputs of the electronic switch 6, 20, the output of which is connected to the information output unit 7, a generator of 8 rectangular pulses, an additional logic element AND 9, a counter-divider 10 with a tunable division factor of 25, the input of which is connected to the output g nerator 8, the first output - with the second input element And 9, and the second output - with control input of the switch 6, the output of the element AND 9 is connected to the second inputs of the elements FROM, and the first input - to the output of the additional threshold element 11, whose inputs are connected with the output of the input unit 1 through a switch 12 connected via control circuits with the keys 4.

Reference numerals 13-22 denote control points of the device circuit, the voltage plots of which are shown 40 in FIG. 4. The diagram (Fig. 2) shows the quantization levels 23

35

bathing levels, its analysis and information output in the form of a volt-second characteristic. This makes it possible to increase the productivity of the pulse overvoltage controller in the vehicle electrical network. 4 or

(CI is the quantization interval), input signal 24, device trigger level 25, level 26 of the nominal voltage value. Curve 27 on fi-g. 3 - volt-second characteristic of the input signal, 28 - one of the points of the volt-second characteristic.

The device works as follows.

The arbitrary waveform under study 24 passes through the input block 1 to the inputs of the threshold elements 2, in which the signal is quantized at fixed levels 23. The quantization interval of the DI, and therefore the number of threshold elements € 1nts 2, is determined by the requirements of the required accuracy. At the outputs of the threshold elements 2, signal sequences are formed at points 13-15, the total duration of which is t;

equal to the duration

corresponding to levels, and ,.

-four

-P

those.

the existence of a signal on the corresponding. quantization level (Fig. 4). At the same time, the signal under study is fed to the input of an additional threshold element 11. The required response level of element 11 is set by switch 12, based on the research tasks (device launch level 25 is indicated in Fig. 2), simultaneously with setting the level, the threshold 4 switches off elements 2, the trigger level of which is below the trigger level 25 set on the threshold element 11. When the signal 24 reaches the level corresponding to the trigger level 25 of element 11, the latter triggers a pulse with

3

at point 16 with the duration t, the first input of the logical element is And 9. Moreover, the second input of the element And 9 receives a signal at point 17 through the counter-divider 10 from the generator 8 of rectangular pulses, From the output of the element 9 and 9, the second inputs of the elements And 3 arrive a signal modulated by high-frequency rectangular pulses to a point 18 of duration t, allowing the passage of bursts of modulated signals formed on fixed quantization levels (plots 19-21, Fig. 4) to memory block 5, where the total count is stored and stored -operation of rectangular pulses in the burst. When the voltage of the signal under investigation drops below the trigger level 25 at the second inputs of the And 3 elements, there is no resolution signal, information is not received in memory block 5 via the channels from the threshold edement. However, the control circuit of the electronic switch 6 from the generator 8 through the counter-divider 10 receives a clock signal with a duty cycle: cycle. Thus, the counting results from memory block 5 through switch 6 are output for each channel to information output block 7. Thus, in block 7, the signals are received with a cycle equal to t, n-ed, which are a sequence of packs of rectangular impulses with a duration equal to the time of existence of the signal at fixed levels (t,, t, tg ...) .. In block 7 of the information output, the signal is decoded and output to a digital indicator with a beat equal to the frequency of the impulses received on the electronic switch 6 from the counter-divider 10 ..

. The coordinates of the volt-second characteristic points are determined in this way. The ordinate is the voltage at a fixed level of quantization, the abscissa is the sum of the time intervals of the signal that exceed this level. So, the coordinates of points 28

 volt-second characteristic t, where t t + t + t, i.e. see t is the total time

2428394,

the existence of a signal at the level of U and above.

Thus, the proposed device provides automatic 5 measurement of the total duration of the signal under study at fixed levels, its analysis and information output in the form of a volt-second characteristic, which allows increasing 10 labor productivity of the impulse overvoltage controller in the automobile electrical network.

Claims (1)

Formula A device for measuring and analyzing pulsed overvoltages, containing n threshold elements, logical elements AND, an additional threshold element and an information output unit, characterized in that, in order to increase labor productivity, n keys, a memory unit, an electronic switch, a switch, a generator of rectangular pulses, a divider counter, an additional logic element And and an input unit, moreover the input of the input block is connected to the input of the device, the output is connected to the inputs of the threshold elements directly, and to the input of the additional threshold element through a switch, the outputs of the threshold elements are connected to the first inputs of the corresponding elements And through the corresponding switches, the outputs of the And elements are connected to the inputs of the electronic switchboard through the memory block, the information output unit is connected to the output of the electronic switchboard, the control input of which is connected to the second output of the counter-divider, the output of the counter-div the body is connected to the code of the generator of rectangular pulses, and the first output is connected to the second input of an additional logic element AND, the first input of which is connected to the output of an additional threshold element, and the output is connected to the second inputs of logic elements AND keys. FIG. g v / 27 fig.Z