SU1317392A1 - Device for measuring single time intervals - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention and measurement accuracy. The device contains a circulator 1, including the OR element 2 and the delay line 3, the elements IV, 12-15 and 10, the generator 11 of quantizing pulses. In the device introduced element And 9, the dispenser 7 pulses, including. trigger 4 and elements 5 and 6, triggers 20-23, counters 16-19. This allows the value of the measured single time interval not to depend on the magnitude of the period of the circulator 1. The relative measurement error will be determined only by the relative error of the quantization period sequence, which amounts to about 10 - 10 W with |

Description

The invention relates to a measurement technique, in particular, to the measurement of single time intervals and can be used in radio engineering and experimental physics. .

The aim of the invention is to increase the reliability by simplifying the device for measuring the ddness of single time intervals and increasing the measurement accuracy to a value due to the relative error of the period of quantizing pulses.

Figure 1 shows the electrical functional diagram of the device proposed; FIG. 2 shows temporary diagrams of a number that show his work.

The device contains a circulator 1 containing an OR 2 element and a delay line 3, the output of which is connected to the first input of the OR 2 element, the second input of the OR 2 element is the input of the circulator 15, the output of the circulator is connected to the counting input of the 1K flip-flop 4 Q output which is connected to the first input of the element And 5, and the Q-output to the first input of the element 6, the second inputs of which are connected to the C-input of the trigger 4. The trigger 4 and the elements 5 and 6 represent the distributor 7 pulses 5 is connected to the inputs of the elements And 8-10 output quartz oscillator 11 kvantukadey pulses. the sequences are connected with other inputs of elements And 8, 12–15, the output of element And 6 is connected to the inputs of elements And 12 and 13, the outputs of elements And 9, 10, 14 and 15 are connected to the C inputs of counters 16–19, output element 8 is connected to the S-input of the RS-flip-flop 20, the Q-output of which is connected to the second inputs of the elements 9 and 10, the first inputs of the elements 14, 15 and 12. The output of the element 12 and connected to the S-BXO– trigger 21 , Whose Q-output is connected to the input; And 9 and 14 elements, and Q-output - to the input of element And 13, the output of which is connected to the S-input of ES-flip-flop 22, whose Q-output is connected to the inputs of elements And 10 and 15, output of the i-ro bit counter 18 is connected to the S-input of the RS-flip-flop 23, the Q-output of which is connected to the input of the element I 12.

The device works as follows.

The pulses of the beginning (ImpL) and end (Imp, 1T) of the measured interval T (Fig 2) are subjected to circulation. The circulation period T (j, T + Tu (Tn is the duration of the circulation period). Imp, T appears at the output of the element And 5, and Imp. TT at the output of the element And 6.

. At the moment of time. i, with a match in the Element And 8 Imp. T with one of the quantizing sequence pulses is set to a single state on the Q-output trigger 20 ,. elements 9, 10, 14, and 15 are opened, counters 16 and 17 start counting the numbers N and M of circulation periods up to t and t, (figure 2), counters 18 and 19 count the periods of the quantizing sequence L and K.

At the moment t, the coincidence of the pulse with the quantizing sequence through the element And 12 is established in the one state by the Q-output trigger 21, the elements 9 and 14 are closed, the numbers S and L are fixed in the counters 16 and 18. The time t does not occur before the expiration of the time interval DT, specified in, the counter 18, due to the inclusion of the trigger 23 and the receipt from its Q-output of the resolution signal to the third input of the element I 12 after forming in the counter 18 of the code corresponding to , by sewing

 gr about - i ul- (.,

(one)

pogr

The moment of coincidence of the pulse of the quantizing sequence with Imp. The bit number of the binary account pin 18, to which RS-flip-flop 23 is connected, on i is determined from the corresponding

 2.lt,) - t,

or

.- S t,

(2)

Where

5t. - relative error of the period of a quantizing sequence.

The onset of time t through the time interval & T, formed in accordance with expressions (1) and (2), compensates for the effect of the error associated with the uncertainty in determining the moment of coincidence of pulses.

At time t, when the subsequent Imp. I G coincides with the quantizing sequence pulse, counters 17 and 19 record the number of periods M and K. The device returns to its initial state by resetting through the R inputs of the triggers and device counters.

From the relationships that follow from the timing diagram shown in

FIG. 2, for times t and

+ NT, j

+. mt ,,

Lt, Kt,

Tv

The value T of the measured single time interval does not depend on the magnitude of the circulator period, the relative measurement error S Ty is determined only by the relative error of the quantizing period; sequences Stj, value of about

which is 10-10

Claims (1)

Invention Formula A device for measuring single time intervals containing a circulator whose input is JO }five 20 25 thirty neither the accuracy of measurements and reliability due to the simplification of the device, the first, second, third and fourth triggers, the seventh element I, the second, third and fourth counters and the pulse distributor are entered into it, the output of the circulator is connected to the input of the pulse distributor, the first the output of which is connected to the first inputs of the sixth and seventh and second inputs of the third And elements, the second output of the pulse distributor is connected to the second inputs of the fourth and fifth And elements, the outputs of which are connected to the B inputs of the first and second trigger, respectively, the inverse output of the first trigger is connected to the second inputs of the second and seventh elements And whose outputs are connected to the C inputs of the second and third counters, respectively, the output of the i-ro bit of the second counter is connected to the S input of the third trigger, direct output which is connected to the third input of the fourth element I, the fourth input of which is connected to the direct output of the fourth trigger, the second input; Dami sixth and first elements And the third inputs of the seventh and second elements And, the inverse output of the second trigger connected to the third inputs of the first and sixth elements And, the output of the last of which the input of the device, six elements And, 35 is connected to the C-input of the fourth count, the first inputs of the first, second, third, fourth and fifth elements And are connected to the output of the quantizing pulse generator, the output of the first element And is connected to the C-input g ... - The first counter, characterized in that, for the purpose of the pin, the direct output of the first trigger is connected to the third input of the fifth element AND, and the output of the third element AND is connected to the S input of the fourth trigger, R-input of all the triggers and counters are connected to the initial bus installation. Gh Ta t F one.. fie-2 Editor T. Parfenova Compiled by I.Kozlov Tehred L.Oliynyk 2420/41 Circulation 370. . 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 1 L and J .., W Proofreader T. Kolb