SU1246375A1 - Multichannel measuring device - Google Patents

Abstract

This invention relates to automation and information and measurement technology and. It is intended for use by B measuring and control systems, systems of optimal control and express signal processing. The invention allows to increase the speed of the device. This is achieved by the fact that in a device containing a pulse generator 8, ele ments 11 and 12, a counter 10 pulses and N conversion channels, each of which contains a summing amplifier 1 multiplying a digital-to-analog converter 2, the first register 6j digital-to-analog converter 7 , an analog-to-digital converter 3 for bit balancing, an adder 4, a second register 5. 1 Il. (

Description

The invention relates to automatics and information-measuring equipment and is intended for use in instrumentation systems 1246375 .2. . -

neither are the digital codes of the ADC 3 and the registers 6. After the bit balancing process has been completed in all the channels, the output of the And 12 element is a difference.

laziness and express processing of signals,

 The aim of the invention is to increase speed.

The drawing is given a functional diagram of the proposed device.

The device contains N conversion channels, each of which contains summing amplifier 1, multiplying 1Y digital-analogue converter 2, analog-to-digital converter 3 bit-wise balancing, adder - 4, registers 5 and 6, digital-analogue converter 7. B. Device input t generator 8 pulses Start button 9, the counter 10 pulses and elements 11 and 12.

The device works as follows.

The input signals are fed to the first inputs of summing amplifiers 1. The second inputs of the multiplying digital-to-analogue converters 2 are fed with a code, the value of which changes, but constantly during each Conversion cycle; at the beginning of the first cycle it is equal to one. Output values of the DAC 7 are zero.

The number of cycles (L) during which the current average input values are determined is determined by the appropriate connection of the element inputs.

11, to the outputs of the counter 1C. In this state, the elements of the device are set in advance. When you press

Buttons 9 allow the simultaneous operation of the ADC 3. The generator 8 pulses arrive at the input of the ADC: 3, thereby ensuring a counter-balancing of the input values. Digital generation time

input equivalents are the same for dl. of all channels and is equal to T .nat, where At is the length of the pulse period of the generator 8, and the number is

binary bits corresponding to

digital equivalent of the maximum value of the estimated values. Finishing the process of the same type: - balancing at the outputs. End. ADP 3 is formed voltage drop, on the front of which is recorded data in

register 5 from the output of adder 4, at the inputs of which at this time moment., on the front of which data is overwritten — from registers 5 to registers 6j the state of counter 10 is changed by one and the DAC 7.

With the advent of a subsequent pulse, the generator 8 begins a new cycle for converting input values.

At the end of the first conversion cycle, the corresponding digital outputs of the device are set

digital equivalents of the following input values

TO

H., K

and.

i 1, N,

five

0

five

Where

.f.

TO

I.U

the value of the input signal at the end of the 1st conversion cycle in the i-th channel; . . transfer coefficient of the multiplying digital-to-analog converter 2 in the 1st conversion cycle, the value of which is 1, and on the corresponding analog outputs - their analogue equivalent. Since, in the course of operation, in each channel of the device, the digital codes of the ADC 3 and the previous results are recorded in registers 6 are summed, at the end of the second conversion cycle. the device outputs an array of the following values

y y + 5ii.I. m 11 2

1-1, N; K „, - -)

at the end of the L-To cycle

5iL Xitl L

W. y 4- iu --iL-i +

at the same time, at the output of the element And t1, a voltage drop occurs, under the influence of which it stops. operation of the pulse generator 8, and consequently, this completes the process of determining the current average input values.

The total time spent at

the operation of the device to obtain estimates of the current average input quantities is equal to T Ln it, and in the well-known system T t.

Thus, the conversion time is reduced as compared with the known 5 device a / c times.

Claims (1)

Invention Formula A multi-channel measuring device containing N conversion channels, each of which contains a multiplying digital-to-analog converter, a first register, a digital-to-analog converter, a summing amplifier, the output of which is connected to the first input of a multiplying digital-analog converter of a given conversion channel, and the first input of a summing amplifier . is the input bus of the given conversion channel, the second input is the corresponding analog output. the front bus and connected to the output of the analog converter of the given conversion channel, the outputs of the first register are the corresponding output tons and connected in series with the corresponding inputs of the digital analogue converter of the given conversion channel, the pulse generator, the control input of which is connected to the output the first element And, whose inputs are bitwise combined with the corresponding second inputs of multiplying digital-analogue converters and bitwise connected to the corresponding Exit pulse counter, the counting input of which is combined with the first inputs of the first registers and coupled to the output of the second elements Compiled by A. Titov Editor G. Volkova Tehred V. Kadar. Correctors. Lugova Order 4022/56 Circulation 816 Subscription Head of the USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 And, characterized in that, in order to improve speed, a Start button was entered into it, serially connected analog-to-digital converter of bit balancing, sum- and second register, the outputs of which are connected to the second inputs of the first register of this channel, are entered into it. conversion, the second input, the second register of each i-ro conversion channel is combined with the i-th input of the second element AND and connected to the output. Conversion end of the analog-to-digital converter Converting the i-ro conversion channel, the first inputs of the summator are connected bitwise with the corresponding outputs of the first register of the given conversion channel, the first inputs of all analog-to-digital converters are equalized and balanced to the output of the pulse generator, the second inputs are combined and through- the Start button is connected to the common bus, the third input of the analog-to-digital converter of the bit balancing is connected to the output of the multiplying digital-to-analog converter of this channel The second inputs of the adder are connected bitwise with the corresponding outputs of the analog-digital converter.