SU1160322A1 - Device for measuring amplitude of pulsed voltage with automatic selection of range of measurement - Google Patents

Description

The invention relates to a radio metering technique and can be used in devices for measuring the amplitude of single and rarely repetitive voltage pulses in a wide dynamic range.

The aim of the invention is to improve the accuracy of measuring the amplitude of the pulse voltage.

FIG. 1 shows the structural. M ^: device diagram; in fig. 2 - time diagrams explaining it.

work

The device contains a-step measuring amplifier (divider) 1, I sequentially connected amplitude-time converters 2 and shapers 3 pulses of decay, the element OR 4,. shaper 5 pulse front * elements And 6 - 8, triggers 9 and 10, the generator 11 counting pulses, element 12 matches, the counter 13 of the channel number, the counter 14 interval, register 15, the counting unit 16.

The input of the p-step measuring amplifier (divider) 1 is connected to the input 17 of the device, and its outputs are connected to the inputs of the corresponding amplitude-time converters 30 of the inputs of all the drivers

• 3 decay pulses are connected to the inputs of the element OR 4. The output of the c-th amplitude-time converter 2 is connected to the input of the front-side pulse generator 35 5, the output of which is connected to the single input of trigger 9. The first input of the element 6 is connected to the output of the element OR 4 the second input - with a single output 40 of the trigger 9, and the third input - with the output of the trigger 1O. The first input of the coincidence element 1.2 is connected to the unit output of the trigger 9, the second input to the output of the generator 11 of the counting pulses. The output of the element 12 match is connected to the input of the counter 14 interval. The first group of outputs of the counter 14 interval is connected to the inputs of the element And 7, the second 50

group of outputs - to the inputs of the element 8. The output of the element 7 is connected to a single input of the trigger 10. The output of the element 8 is connected to the zero input of the trigger 9. The output of the element 55 and 6 is connected to the input of the counter 13 of the channel number, to the control input of the register 15 and with inverse

, the input element 12 matches. The reading unit 16 is connected to the output of the counter 13 of the channel number and the output of the register 15.

The device works as follows.

Before the trigger starts

9 and 10, the counters 13 and 14 and the register 15 are set to the zero state (the circuit of the initial installation is not shown). The input signal from the output 17 of the device enters the P-stage measuring amplifier 1. Amplitude-time converters 2 convert the amplitudes from the outputs of the corresponding stages of the amplifier 1 into time proportional intervals (1 ^ - [/ y) Signal from the output of the amplitude-time converter 2 corresponding to the sensitivity of the stage itself, is fed to the input of the front 5 pulse of the front, the output of which sets the trigger 9.

in a single state. The signal 11 $ from the output of the trigger 9, acting on the input of the coincidence element 12, permits the passage through it of the pulses ‘of the generator 11 to the input of the counter 14 of the interval. From the outputs of the formers 3 through the element OR 4 to the input of the element And 6 receives impulses сп ^ recession. The passage of pulses through the element 6 is prohibited for a period of time corresponding to the initial non-linear segment of the amplitude characteristic.

The specified time interval is formed by counting by the counter 14 of the corresponding number of pulses, at which single signals appear at all inputs of element 7 7. In this case, the element And 7 is set to one state and switches the trigger 10. The signal C ₈ ^t from the output of the trigger 10 enters the input of the element And 6 and permits: the passing of the decay pulses through it. In this case, the input of the counter of channel 13 and the control input of the register 15 receives pulses.

CD When each pulse 1} * arrives at the control input of register .15, information from counter 14 is rewritten to the last. The number of I-pulses recorded in counter 14 by this time is proportional to the amplitude of the input signal. What to exclude failures of information when you ³

write to the register 15, the duration of the * £ "impulses TH 9 selects more than the transition time in the counter

14 interval and the passage is prohibited-. the calculation of the counting pulses of the generator 11 through the element 12 coincidence for the duration of the pulse duration MD, coming from the output element And 6 · .in the inverse input of the element 12 coincidence. The number of missing counting pulses is taken into account in the readout block 16 by adding the number η *

, to the number of,,, where Ti is the duration of the | impulse of recession; T is the period of the frequency of the counting pulses; Ν- step number. 15 At the end of the time interval corresponding to the work area of the amplitude response at all. At the inputs of element 8, single signals appear. Element And 8 is set to one state and switches the trigger 9 to the state of logic zero. In this case, further passage of the pulses V p of the decay through element 6 and counting 25 pulses of the generator 11 through the element 12 coincides is prohibited.

As a result, in the counter 13 there will be recorded information, defined as ©

1160322 4 ‘

dividing the number of steps in which the amplitude of the input signal is closest to the upper boundary of the working section of the amplitude characteristic, and the register 15 will contain information proportional to the amplitude of the input signal. '

The reading unit 16 provides information output from the counter 13 and the register 15.

In the proposed device, in contrast to the known, the amplitude of the pulse voltage is determined not by the minimum, but by the maximum of the time intervals lying on the working section of the characteristic am-. Plymuda time.

Since time intervals are determined by filling them with counting pulses of a generator and the duration of the maximum of these intervals can be several times longer than the minimum, the proposed device allows several times more accurate measurement of the amplitude of the pulse voltage. ·

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Claims (1)

A DEVICE FOR MEASURING THE AMPLITUDE OF PULSE VOLTAGE WITH AUTOMATIC SELECTION OF A RANGE OF MEASUREMENT, containing η-step measuring amplifier (divider), the input * of which is connected to the input of the device, n, connected in series by the developers of amplifters-time converters and. trigger, interval pulse counter, channel number counter; the first AND element, the OR element, the counting pulse generator, the readout block and the coincidence element, the amplitude-time converters inputs are connected to the corresponding outputs of an η-stage measuring amplifier, the outputs of the decay pulse drivers are connected to the inputs of the OR element, the output of which is connected to the first input of the first element I, the output of which is connected to the input of the counter, the channel number, the input of the front pulse shaper is connected to the output of the nth amnlt-time converter, the output of the pulse shaper front is connected to a single input of the first trigger, the output of which is connected to the first input of the coincidence element, the second input of which is connected to the output of the counting pulse generator, and the output is connected to the input of the interval counter, the code of the channel number counter is connected to the input of the readout block, characterized in that in order to improve the accuracy of measuring the amplitude of the pulse voltage, a second trigger, a register, a second and a third I elements are additionally introduced into it, and the first group of outputs of the interval counter is connected to the inputs of the second el ment and whose output is connected to the zero input of the first flip-flop, the second group of outputs of the interval counters snip ⁵ is connected to the inputs of the third AND gate, whose output is connected to a single input of the second latch, the first latch output is connected to input vtorm first AND; the third input of which is connected to the output of the second trigger, the output of the first element I is connected to the inverse input of the coincidence element and to the control input of the register, another input of which is connected to the output of the interval counter, and the output of the register is connected to the second readout block. G160322 2