SU543878A1 - Pulse voltmeter - Google Patents

Description

one

The invention relates to a pulse technique.

A device for measuring pulse amplitude is known. Widespread voltmeters with redundancy

amplitude of on-time preliminaries (WUAs).

The well-known pulse voltmeter consists of a WUA, an average interval extraction unit, an analog-to-digital converter, and a reading device. The input of the voltmeter is connected to the inputs of the WUA, the outputs of which are connected to the middle interval extraction unit, and its output through the analog-to-digital converter is connected to the counting device.

The operation of the known device is as follows. Upon admission to the input of a voltmeter pulse WUA form And time intervals. The time interval values are determined by conversion factors and transducer errors, random processes, and so on. The average interval selection block selects the interval that is most different

from extreme values. This interval is converted into a number-pulse code by means of an analog-to-digit converter and converted by means of a readout device into a parallel code that determines the number displayed on the digital display. In case of failure of the WUA, the performance of the voltmeter fl.

The aim of the invention is to increase reliability.

Claims (1)

To do this, an analog-to-digital converter, the output of which is connected to a reading device, is introduced into the pulse voltmeter containing P parallel-connected amplitude-time converters, a trigger and a matching element connected to an analog-to-digital converter, and the input of an OR element is connected to the outputs of all amplitude-time converters, and the output to the first inputs of the trigger and the coincidence element, the second inputs of which are connected to the output of the middle interval selection unit trigger output, respectively. The drawing shows a structural electrical circuit of a pulsed voltmeter. The voltmeter consists of P amplitude-time converters 1-1, 1-2, 1-3. ,, ,, ,,, 1-tl, block 2 for selecting the middle interval, element OR 3, trigger 4, element matches 5, analog-to-digital converter 6 and reading device 7. The input of the voltmeter is connected to the inputs of amplitude-time converters, the outputs of which are connected to the inputs of block 2 and the element OR 3, the output of which is connected to the first inputs of the trigger 4 and element 5, the output of which through Converter 6 by The key to the device 7, and the average interval separating unit output shaft 2 is connected to the second input flip-flop 4 whose output is connected to the second input member 5 On admission to the input of the voltmeter WUA pulse shape P timeslots. The time interval values are determined by transformation coefficients and errors, random processes, and so on. The average interval selection block allocates an interval that is most different from extreme values. A feature of the operation of a pulsed voltmeter is that the beginning of the conversion interval (the leading edge of the pulses generated by the WUA) of all WUAs coincides and is determined by the falling edge of the measured impulse. The OR 3 element extracts the maximum pulse from the WUA outputs and the leading edge of this pulse triggers 4 is set to one, and this pulse is simultaneously fed to one electrical input 5, Trigger 4 is reset to the falling edge of the output pulse. average interval. Thus, at the output of the trigger, and consequently, at the output of element 5, it forms with a pulse of a duration determined by its pulse, formed by the middle interval selection unit. This interval is converted by the analog-to-digital converter into a number-pulse code and converted by means of a counting device 7 into a parallel code that determines the number indicated on the digital display. If it fails more than Qi converters, then the middle interval selection block does not generate a signal, and the operation proceeds as follows. The pulses from the WUA output through the collection circuit 3 arrive at trigger 4, which is set to one state by the leading edge, and the same signal goes to the element 5 and then to the converter 6. In this section, at the output of element 5, the maximum duration of those present is formed at the outputs of the WUA pulses. Thus, even with one serviceable WUA, a pulsed voltmeter remains operable, which indicates high reliability. This principle can be used to increase accuracy and reliability in any conversion, where the beginning of the conversion interval is determined by external factors, and the end of the interval is determined by the conversion factor. An impulse voltmeter containing P parallel-connected amplitude-time transducers, the outputs of which are connected to an average interval extraction unit, an analog converter — a digit whose output is connected to a readout device, characterized in that, in order to increase reliability, a logical the OR element, the trigger and the coincidence element connected to the analog-to-digital converter, the input of the OR gate connected to the outputs of all amplitude-time converters, output - to the inputs of the first flip-flop and a coincidence element, second inputs of which are connected to the output of the average interval separating and trigger output, respectively. Sources of information taken into account in the examination: 1, USSR Copyright Certificate № 416620, M, Cl (OlK 19/04, 1972 (prototype)