SU1448335A1 - Signal on-off ratio meter - Google Patents

Abstract

The invention relates to a measurement technique. The purpose of the invention is to increase the speed of measurement of the duty cycle. To achieve the goal, an impulse and pause block 1, a trigger 6, a counter 10 and a digital reading device P are entered into the duty cycle meter. In addition, the porosity meter contains a stable current source 2, a charge unit 3, a row, a charge unit 4, comparator 5, converter. 7 voltage - current, element 8 And, generator 9 counting pulses. Duty meter can be used in experimental physics, television, radiolocation. 1 il.

Description

hlg / 7

This invention relates to analog measurement technology.

The purpose of the first invention is to increase the speed,

The drawing shows the block diagram of the Device,

The device contains a pulse separation and pause block I, a stable current source 2, charge-discharge block 3, charge block 4, trigger comparator Sj trigger B, voltage converter 7 current, element 8, generator 9 counting pulses, counter 10s digital display device 11,

The first input of the pulsing and pausing B block 1 is the device input, the second input is the start input, the first input is connected to the first input of the block. 4 charge, the input of the trigger 6 to the preset input of the counter 10, and the second output with the first input of the charge-discharge unit 3, the second input of which is connected to the output of the stable current source 2 and the second input of the charge 4 unit yes, the output of which is connected through the converter 7 voltage - current to the fourth input of the charge-discharge unit 3, whose voltage through the comparator 5 is connected to the reset input of trigger b, the output of which is connected to the third input of the charge-discharge unit 3 and block .4 charge, and the first input element And 8, the second input of which is under It is connected to the generator output of 9 counting i-pulses, and the output to the counting input of counter 10, the output of which is connected to the input of a digital reading device, IS.

The device operates as follows.

In the initial state, the device input is blocked, the storage capacitors of the charge-discharge unit 3 and the charge unit 4 are connected to the initial voltage, the trigger 6 is in the zero state, and the input of the And 8 element is closed.

According to the start signal, the block 1 for the separation of a pulse and a pause from the input pulse sequence forms a signal G, equal to the duration

f

momentum, and. then the signal t T - (, equal pause between pulses,. During the flow, the source 2 of a stable current is connected to the charge unit 4 and the stage of charging the capacitor to the voltage

and.

(one)

where Ig is the charge current;

C2- - the value of the capacity of the block 4 for the R yes,

U is converted to discharge current.

ig

Rfl (2)

a voltage-current converter 7, where R 3 is the equivalent resistance at which the conversion process takes place. By dropping the signal into counter 0, the number corresponding to one unit of duty ratio Q is entered and trigger 6 is set to i, the element 8 is disconnected, the generator impulses 9 of counting pulses are fed to the counter input of counter 10, and the voltage converter 7 is connected to block 3 charge yes At the same time, with the signal t, the charge-discharge unit 3 is connected to a stable current source 2, as a result of which the capacitance is charged with a current) to a voltage

(l3-ib) t

(3).

At the end of the signal t, the stable current source 2 is disconnected from unit 3 and linear discharge of the capacity of unit 3 occurs over time.

and. C. t, i-i (4)

With a current up to the voltage of the comparator 5, the signal from the comparator 5 triggers the 6, returns to the initial state, as a result of which the potentials on the capacitors of the blocks 3 and 4 are set to the initial state, the input element And 8 is closed. The number of pulses counted by counter 10 during the interval t + t (., Taking into account the previously recorded number, is proportional to Q and is displayed in the digital reading device II.

From - (3) and (4) we get (1h-1;,) e

 ,

taking into account (1) and (2) we move on

(t + tb), since t T-i

with

teach t - -

(t-j-t ,,)

Since it was 1 time in counter 10 in advance, then counter 10 will register a number proportional to Q. After asking, for example, an accuracy of 0.01%, you must enter the number 100 in counter 10. To calibrate the device, a pulse sequence with a duty ratio Q 2 and by changing the current, it is ensured that during the time t + tp the counter registers 100 pulses.

The advantage of the device lies in its increased speed in comparison with the prototype due to the start of the counting process immediately after the end of the pulse.

Claims (1)

Invention Formula The duty cycle meter containing a stable current source, a charge-discharge unit, a charge unit, a comparator, a voltage converter — a current whose output is connected to the fourth input of the charge-discharge unit, the output of which is connected to the comparator input, and the second entrance - exit a stable current source and a second input of a charging unit, the output of which is connected to the input of a voltage converter — a current, a generator of counting pulses, and an element I, the second input of which is connected to the output of a generator of counting pulses, so that, in order to improve speed, an impulse and pause block, a trigger, a counter and a digital reading device are added to it, the first input of the pulsing and pause block and the input of the device, the second input is the start input, the second Soy output It is dinen with the first input of the charge-discharge block, and the first output is with the first input of the charge block. 0 by the preset counter input and the trigger setup input, the reset input of which is connected to the comparator output, and the output to the third inputs of the charge-discharge unit and the charge unit, 5 and also with the first input of the element I, the output of which is connected to the counting input of the counter, the output of which is connected to the input of the digital reading device. Compiled by E. Minkin Editor M. Tovtin Tehred M. Didyk Order 6846/52 Circulation 373 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk Nab. Proofreader L. Patay Subscription