SU746559A2 - Discrete system for automatic monitoring and measuring of parameters - Google Patents

Description

one

The invention relates to instrumentation technology and can be used in control systems for multiparameter objects with complex parameters.

Basically auth. No. 316092. describes a discrete system for automatically monitoring and measuring parameters, comprising a device for generating test signals, switches, intermediate converters for monitored parameters (so-called primary converters), an analog-to-digital converter 15 (ADC), a comparator, a device for generating a judgment ( for each monitored parameter in the form, + or -), a device for issuing measurement results, for example, 20 in the form of a print, a device for issuing control results, for example, in the form of light Pass th display or no-go and the corresponding print, a self-test device, the control device 25 is a semi-.i analog read only memory, connected via the switches and intermediate converters controlled parameters to the input of the ADC., 30

Insufficient accuracy of such a system due to the use of analog memory. It is difficult to carry out analogue memory devices that will be accurate and stable for a sufficiently long time; Stability is necessary during the service life or at least during the time between routine maintenance; this time is usually half a year. The instability of the analog memory in time and from switching to switching reduces the accuracy of the control system.

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The aim of the invention is to improve the accuracy of the system.

This goal is achieved due to the 1 high accuracy of digital storage of setpoints in combination with analog setting generators in a video analog semi-permanent memory and an exhibition system of specified analog values using control-input DAC devices and a discrete memory connected to a matching device, which output through The DAC is connected to the installation input of the COX-switch and one input of the analog semi-permanent memory, the other input of which is connected via a switch with

device for the formation of test skygals.

The functional scheme of the system is shown in the drawing.

The system comprises a forming device 1. test signals consisting of several generators 2 stimulating signals (three generators are conventionally shown) connected via switch 3 to the inputs of the control object 4. The last outputs are connected via switches 5 to the inputs of intermediate (primary) transducers of monitored parameters (conventionally shown call atel). An analog semi-wired storage device (setpoints) is also connected to switches 3 and 5. Outputs of pre-conversion is a switch 8

connected to the A / D converter 9 (conventionally, two converters are shown), whose output through the Switch 10 is connected to a matching device 11, connected to a discrete memory 12. The device 11 is connected by the next d device 13 to form a judgment, through measurement and control, and also through a DAC 14 with memory 7 and switch 5. A control device 15 is connected to all systems of the system.

The system works in three etypy.

Initially, the system outputs the setpoint of the analogue setpoint; cootBeTCTByKffljefe memorized code. Then, from the analogous setpoint, a setpoint code is formed, but already taking into account the path error, and then the monitored parameter is converted into a code and compared with the setpoint, taking into account not effiHoctre

At the nepsofi stage, the analog sign-. setting, containing the error BpieiyieHHoro and temperature drift, with the device 7 through the switches 5, 8 (mine converter .6), through the ADC and the switch 10. fra device 11 is supplied, where it is mapped to the nominal setpoint code from the device 12. Routing code through the DAC 14 VrtpaaJia T. device 7, change the value of the setpoint until the difference value vanishes. Thus, o6pa3ONf, eliminates all the drifts of the analog band, sets the analog value of the analog set, while there are no transducer errors b. The analog setpoint is usually formed with the help of the geoerator 2 and is entered into the device 7, where it is peryJiHpy eTeH through the jomuthator 3.

On the second step, you set the analog setpoint value from device 7 (lower tolerance) through switch 5, converter b, switch 8, ADC 9 switch 10

matching device 11 is installed in device 12, where the setpoint code, which already takes into account the error of the converter, is stored.

Similarly, the upper tolerance limit is formed and stored.

At the third stage, from device 1 through switch 3, the stimulus Irukediy signal is fed to the control object 4, which, under the influence of the stimulus, generates a signal (controlled pa. Meter) through switches 5,8,10, corresponding to converter b and A 9 to device 11, where compares the tolerance for tolerance, taking into account the accuracy of the transducers. The codes of these boundaries come from device 12, where they were stored in the second stage.

. From the output of the device 11, the result of the comparison is fed to the devices 13 for forming a judgment, for issuing measurement results and monitoring.

The implementation and sequencing of automatic control on all types is ensured by the control device 15.

 The proposed system expands the control in all those cases when tipH exhibits a predetermined sign: By using a stored code, an unstable intermediate converter succeeds, for example, when monitoring an impulse object. For example, the proposed automatic control system, in accordance with the description of the work described above, will check the frequency in a pulse when the Intermediate transformer is made in the form of a frequency discriminator of unstable elements. TeHepatop 2 in continuous 1 mode adjusts to the code FROM device 12, pass through ADC 9, but mine Converter 6. Then signal from generator 2 is passed through converter B and stored in Device 12 as a setpoint with which the measured signal is compared.

Claims (1)

The system with high accuracy can measure microwave power in a pulse. If the transducer is executed also in the form of a calibrated attenuator with a diode at the output, then it is possible to limit the exhibition to only the Minimum setting for its digital value using a thermistor meter (first stage). At the second stage, the minimum setpoint value is passed through the primary converter (attenuator and diode) and then through ADC 9 and remembered (the instability of the transmission coefficient of the diode is the main part of the error, however, the diode has nothing to replace when measuring the microwave pulse intensity). In the third step, the microwave pulse is measured. input calibrated attenuator. The described variant of the device operation will allow to reduce the microwave power level from the generator of the setpoint, which is appropriate, since the maximum setting can not be set. The system is transparent, and it controls the accuracy of controlling only radio engineering, but also electrical parameters, for example, the effective voltage value, etc. The system self-test can be carried out directly on the signal of any generator 2, or using the device 7 with a preliminary exhibition of the nominal signal value by self-checking according to the preset code in the device 12. This system allows to provide a long-term accurate test of the limits of the tolerance fields adjustment of analog setting to its nominal value. memorized in a discrete memory, eliminate the setpoint error due to destabilizing factors (time, temperature, etc.). Claims of the Invention Discrete system of automatic control and measurement of parameters by the author. No. 316092, which means that, in order to improve the accuracy of the system, a digital-to-analog converter was inserted into it and a discrete memory connected to the comparing device, the output of which is connected to an installation echo via a digital-to-computer converter. KOMNiyTHTopa and the input is the input of an analogue proprietary memory device, the other input of which is connected through a switchboard to a test signal generation device.