SU1332239A1 - Device for measuring the amplitude of single pulses (its versions) - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to increase the accuracy, speed and simplification of the device. The device contains a subtracting unit 1, blocks 2 and 6 delays, a source (I) of a reference voltage, comparators 4 and 5, and a counter 7. The introduction of a scaling block 8. The input of which is connected to output 3 and the output to the second input of comparator 5, as well as connecting the input of the comparator 4 to the input of the device and the output of AND 3 improves the measurement accuracy twice as compared with the variant of the proposed device, where the input of the scaling unit 8 is also connected to the second input of the comparator 5. The output of the scaling unit 8 is connected to the second the input of the subtracting unit 1 and the first input of the comparator 4, the second input of which is connected to the input of the device. At the same time, the measurement time, proportional to the number of cycles, in the second variant is two times less than in the first one. 2 sec. f-ly, 2 ill. i (L with oo to to Od with ff /. Fig.1

Description

The invention relates to electrical measuring technology and can be used to measure the amplitude of single and rare repetitive pulses.

The purpose of the invention is to improve the accuracy, speed and simplification of the device for measuring the amplitude of single pulses.

FIG. 1 and 2 show a block diagram of a device for measuring the amplitude of single pulses, variants.

The device comprises a subtracting unit 1, the first delay unit 2, the source 3 of the reference voltage, the first and second comparators 4 and 5, the second delay unit 6, the counter 7 and 8 scaling.

The input of unit 1 is connected to the input of the device, the output of the first delay unit 2 and the inputs of the first and second comparators 4 and 5. The output of the first comparator 4 is connected to the input of the counter 7 and through the second delay unit 6 to the strobe input of the second comparator 5.

In the first embodiment of the device (Fig. 1), the output of the source 3 of the reference voltage is connected to the inputs of the subtractive unit 1, the first comparator 4 and through the scaling unit 8 to the input of the second comparator 5

In the second embodiment (Fig. 2), the output of the source 3 of the reference voltage is connected to the input of the second comparator 5 and through the scaling unit 8 is connected to the inputs of the subtractive unit 1 and the first comparator 4.

The device works as follows.

A pulse with amplitude U is fed to the input of the subtracting unit: 1 and the inputs of comparators 4 and 5. When a pulse passes through block 1, the amplitude U decreases by the amount of level supplied to the second input of block 1 and through block 2 delays again arrive at the inputs of comparators 4 and 5 and the block The number of pulses, exceeding the reference level of the comparator 4, is counted by counter 7. The comparator is gated in each cycle by a pulse coming from the output of block 6 of delay, the delay time of which is equal to the delay time of block 2.

In the first embodiment of the device, the transmission coefficient of the scaling unit 8 is 0.5. To the inputs

five

0

i.and g

UX-UJT

unit 1 and comparator 4 from the output of the source 3 of the reference voltage receives level 11, and to the input of the comparator 5 - level 0.5-Uj. In each cycle, the amplitude U is reduced by the value of Uj and compared to the level of UjT using the first comparator 4. In the first cycle, a pulse with amplitude Ux is input to the input of KQM-parator 4, in the second cycle - U.-Uj7, in the third - Uy-2Uj etc. The measurement process continues for N cycles, for which the condition

(Let the comparator fail in the N + 1 cycle, the number of NVBN + 1 cycles in counter 7 remains fixed. The comparator 5 gates with the N pulse. If 0.5U3T, then the comparator 5 is fixed in the state of a logical one, and otherwise - in the state of logical zero. The measurable quantity Uy is determined by the formula:

 ,, T- / 2 (2N + oi), where N is the code recorded in counter 7;

0: (jt - logical 0 or 1 - the state of the comparator 5. In the second variant, the transfer coefficient of the scaling block 8 is equal to two, therefore, to the inputs of the subtractive

5 unit 1 and comparator 4 receives a level of 2Ug, and the input of the comparator 5 is the voltage UjT. In the first cycle, the inputs of the comparators receive a pulse Uy, in the second - U -2UjTj

0 third - etc. The measurement process continues for N cycles, for which, (N-1) 2113. Suppose that in the N + 1 cycle. Then the comparator 4 does not work.

5 in the counter 7, the code N is solved. If in the N + 1 cycle U.y-2Uj, MLet, then the strobed comparator 5 is fixed in the state of logical 1, and otherwise - O. The measured value is not determined by the formula

U, UjT (2N + o ().

In the first version of the device, the accuracy is two times higher than in the second. The measurement time, proportional to the number of cycles, in the second variant is two times less than in the first one. If, in the first variant of the device, the value of Uj is two times larger than in the second variant, then in terms of accuracy and speed both technical solutions will be equivalent.

Claims (2)

1. A device for measuring the amplitude of single pulses, containing a subtracting unit, the first input of which is connected to the input of the device and the output of the first delay unit, the second input - with the output of the reference voltage source, and the output - with the input of the first delay unit, the first comparator, the output of which connected to the input of the counter and through the second delay unit connected to the input of the second comparator, the first input of which is connected to the input of the device, characterized in that, in order to improve the accuracy, speed and simplicity audio device, it introduced a scaling unit having an input connected to the output of the reference voltage source, and an output - to a second input of the second comparator, the inputs per1332239 A comparator is connected to the input of the device and the output of a reference voltage source. 2. A device for measuring the amplitude of single pulses, containing a subtracting unit, the first input of which is connected to the device input and the output of the first delay unit, and the output - to the input of the first delay unit, the source of the reference voltage, the first comparator, the output of which is connected to the counter input and through the second delay unit it is connected to the gate input of the second comparator, the first input of which is connected to the device input, characterized in that, in order to increase the accuracy, speed and simplification of the device, One is a scaling unit, the input of which is connected to the output of the reference voltage source and the second input of the second comparator, and the output is connected to the second input of the subtracting unit and the first input of the first comparator, the second input of which is connected to the input of the device. Compiled by B. Veremeykin Editor A. Vorovich Tehred M. Khodanich Proofreader S. Cherni  Order 3828/41 Circulation 730. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig2