SU640245A1 - Time interval meter - Google Patents

Description

The device works as follows.

The combined inputs of circuits 7-11 are fed to the signal under investigation, the duration of which must be measured, and to the second individual inputs of these circuits an equally shifted sequence of counting pulses with period A7 in such a way that the pulses coming in the input of the key circuit DG

7, delayed pa time relative

t

pulses arriving at the input of the key circuit 8, etc. In the initial position, prior to the arrival of the signal under investigation, the key circuits 7-11 are closed, the triggers of the auxiliary counters 1-5 and counter 6 are in the zero state. With the arrival of the test signal, the key circuits 7-11 open and remain open for the measured time interval. The counting pulses through the key circuits 7-11 during the measured time interval arrive at the first triggers 2-5 of the auxiliary counters 2-5, and the trigger G via the subtraction circuit 12 and the OR 13 element.

In scheme 12, one pulse is subtracted from the packet, after which the pulses in this packet are counted both in the first auxiliary counter and in the main counter. The pulses in the remaining packs are counted as auxiliary counters 2-5. When the pulses in the packs are counted, mainly and auxiliary counters, the number of pulses corresponding to the measured interval is adjusted. In each of the auxiliary counters and mainly recorded a certain number of impulses. If this number in the first auxiliary counter differs by two units at least from one of the numbers in the remaining auxiliary counters 2-5, or when the first triggers 2-5 of the auxiliary counters that are in the same state differ from the trigger state G, the corrective block 14 generates a pulse, which is fed to the second input of the element OR 13 and then to the trigger input and is calculated in the main and first auxiliary counters. As a result, a smaller number is recorded in the main counter, and in the auxiliary counters 1-5, either the same numbers (ending in the same code combinations) or more than one can be recorded.

In the second step of the refinement of the duration of the measured time interval, the codes in the auxiliary counters 1-5 are processed. The adder If) is the addition of units received from the outputs of the triggers U-5. The code from adder 15 falls on the decoder 16, in it it is converted into a binary-decimal code, which corresponds to the sum of units if trip-o G is in the state of logical zero (in the main counter an even number). If trigger 1 is in the state of a logical unit (an odd number in the main counter), a code corresponding to the number of zeros in the G-5 flip-flops appears at the output of deshfrator 16. The code from the output of the decryptor 16 is transferred to the register 17 of the specifying decade, after which the updated counter of the measured time interval in the binary-tenth code will be recorded in the main counter and in the register 17. This completes the measurement process.

Claims (2)

1.Rehnn E.N., Kurashov A.A., Chernov P.S. Measurement of time intervals in experimental physics. M., Atomizdat, 1976, p. 145. 2. USSR author's certificate number 390501, cl. G 04F 8/00, 1970. Login