SU1251707A1 - Device for measuring time intervals - Google Patents

Description

(21) 3818440 / 24-21

(22) 11/30/84

(46) 03/15/87. Bul № 10 (72) A.G.Morozov, N.A.Bessonova and M.A. Voronin (53) 681.317 (088.8) (56) Meleshko E.A. Integrated circuits in nanosecond nuclear electronics. - M .: Atomizdat, 19775 Fig.3.19, pp.157-159.

USSR author's certificate number 551600, cl. G 04 F 10/04, 1975. (54) (57) A DEVICE FOR MEASURING INTERVALS OF TIME, containing a generator of counting pulses, two forming start and stop pulse triggers, the first and second block of ambiguity, the three elements And, the delay element, the converter time scale, the output of which is connected via a key to the counting input of an exact meter, the overflow output of which is connected to the first input of the meter iby6oro, the first output of the counting pulse generator is connected to the second key input and the first input The first element is And, the second input of which is connected to the first output of the first disambiguation unit, the first input of which is connected to the output of the forming trigger of the start pulse; the third input of the first element And is connected to the first output of the second ambiguity control unit, the first input of which is connected to the output of the forming trigger of the stop channel, the second output of the generator of counting pulses is connected to the second input of the first block of ambiguity, the third output of the generator of counting pulses is connected to The first input of the second ambiguity unit, characterized in that, in order to simplify the device and increase its reliability, an OR element is introduced into it, the first input of which is connected to the output of the second element AND, the first input of which is connected to the output of the forming trigger trigger signal, the second input of the second element AND is connected to the second output of the first block of ambiguity, the second input of the element OR is connected to the output of the third element AND, the first input of which is connected to the output through the delay element stop signal, the second input of the third element I is connected to the second output of the second disambiguator, the output of the first element I is connected to the counting input of the coarse measurement counter, the installation input of which is connected to the installation input of the counter of the accurate measurement, to the installation inputs of the forming start and start triggers stop channels and bus Reset device, and the output element OR is connected to the input of the time scale converter. X12 The invention relates to a pulse technique and can be used in experimental physics and radar. The aim of the invention is to simplify the device and increase its reliability. Figure 1 shows a block diagram of a device for measuring intervals of time; 2, time diagrams of the device operation. The device for measuring time intervals contains a generator 1 of counting pulses, the output of which is connected to the inputs of two blocks 2 and 3 of the ambiguity of counting and to the input of key 4. The output of the forming trigger 5 of the starting pulse is connected to the first input of the element 6 and to the input of the block 2 ambiguity reference, the output of which is connected to the second input of the element And 6, and the code of unit 2 is connected to the input of the element And 7, the other input of which is connected to the output of the generator 1 of the counting pulses. The output of the forming trigger 8 of the stop pulse through the delay element 9 is connected to the first input of the element 10 and to the input of the block 3 eliminating ambiguous counting, the first output of which is connected to the third input of the element 7 and the second output of the block 3 is connected to the second input of the element 10 The output element And 7 is connected to the counting input of the counter P coarse measurement, the input of which is connected to the output of the meter 12 of the exact measurement, the counting input of which is connected to the output of the key 4. The first input of the element OR 13 is connected to the output of the element And 6, and the output And 10 is connected to the second input of the element OR 13, the output of which is connected to the input of the time scale converter 14, the output of the time scale converter 14 is connected to the first input of the key 4, The converter 14, the key 4 and the counter 12 form an exact measurement unit, Blocks 2 and 3 can be performed on two series-connected triggers, the counting inputs of which are connected and connected to generator 1; Counter 11 at its input contains an OR element, whose inputs are connected to generator 1 and to output 7 of the initial state before beginning m of each cycle of measurements with a reset pulse arriving via the bus. Reset counters 11 and 12 are set to O, and the forming triggers 5, 8 are sent to 1, and the pulses of generator 1 are not passed to the counting input of counter 11 of coarse measurement. With the arrival of the starting pulse (see Fig. 2, a), the forming trigger 5 is retracted (see Fig. 2, b), ensuring the triggering of the block 2 for disambiguating the count, while an accurate synchronization of the beginning of the measured interval with the pulses of the 1 counting pulses occurs. (see figure 2, c) at the output of block 2 (see figure 2, d). The output impulse of unit 2 permits the impulses of the generator 1 to pass through the element AND 7 temporary gates to the counting input of the rough measurement counter 11 (see, Fig. 2, e). Element And 6 performs the selection of the time interval. figure 2, e). With the arrival of the stop pulse, the trigger 8 is transferred to the formations (see Fig. 2, g), providing at the output of the block for disambiguation of the counting ambiguity accurate synchronization with the generator 1 pulses of the end of the measured time interval t (see Fig. 2, h). In this case, the output pulse of the block 3 stops the passage of the pulses of the generator 1 through the element And 7 (see, figure 2, d). The output pulse forming trigger 8, delayed by the delay element 9 at time t (see Fig, 2, and), is fed to the first input element And 10, the output of which is the selection of the time interval c2 (see Fig, 2, k). The output pulses of the elements AND 6, 10 through the element OR 13 (see Fig. 2, l) are fed to the input of the converter 14 of the precision measurement unit and increased by a factor of k (k is the scale conversion factor for duration (kt ,, kt ,,) from the output of the time scale converter 14 is fed to the input of the key 4, allowing the pulses of the generator 1 to pass to the input of an accurate measurement counter 12, the capacitance of which is k.In the case where (k (, j) k, the resulting overflow pulse

3125t7074

+ 1 with the output of ca R, where k is the conversion factor for overflow and the reset input of the time scale.