SU1182482A1 - Digital meter of time intervals - Google Patents

Abstract

DIGITAL TIMER METER. INTERVALS containing n AND elements, the first inputs of which are connected to each other, an OR element, the first input of which is connected to the output of the nth AND element and a pulse counter, which is designed to improve the reliability of the device and improve the measurement accuracy x the total duration of the sequence of time intervals, entered into it (n -1) of the elements OR, conv. i-ro of the element AND, excluding the n-th, connected to the first input of the i-ro of the element OR and to the second input (1 + 1) th element And the second input of the first element And is connected to the inverse of you Odom n-th AND gate and with a counting input of pulse counter, whose reset input is connected to the bus initial installation and the first inputs of AND gates, the third inputs of which are connected to the outputs of the respective OR elements, rye secondary inputs are combined and connected to an input bus.

Description

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fUS./ The invention relates to electrical measuring equipment and can be used to measure the duration of both single and a number of time intervals. The purpose of the invention is to increase the reliability of the device and increase the accuracy when measuring the total duration of a sequence of time intervals. FIG. 1 shows a block diagram of a digital time interval meter 9b} in FIG. 2 - timing diagrams explaining the operation of the meter; a) - signal Start on installation; b) Ug - measured signal at the second inputs of the elements OR 5-7} c) U2 - signals at the output of the element And 2j d) 1) 3 - at the output of the element And 3; e) 1) 4 - at the direct output of the element I 4; e) U - at the inverse output of the element And 4. In FIG. 2 is denoted by the following: C n p e rm the sequence of time intervals} -fcj is the delay time of one element I, i ;, is the time of occurrence on the Input terminal of the first time interval measurement interval; iJ is the moment of the end of the first interval of the measured time sequence, H, is the moment of occurrence of the i-th interval of the sequence; ij is the end point of the i-ro sequence interval; T, is the period of quanta tsikh pulses; i the time of occurrence of the first quantizing pulse of the 1st interval of the time sequence. The device contains a pulse counter 1, AND 2-4 elements connected in series, OR elements 5-7, with the second inputs of the OR elements 5-7 connected to each other and to the input bus, the first inputs to the outputs of the AND elements 2-4, and the outputs from the third inputs of the AND 2-4 elements, the first inputs of the AND 2-4 elements are interconnected with the reset bus of the pulse counter 1 and with the initial installation bus (LC), the inverse output of the AND 4 element is connected to the second input of the I 2 element and with the counting the input of the counter 1 pulse, the output element And 2 connected to the second input element And 3 , and the output element And 3 - with the second input element And 4. The device operates as follows. 822 Before the start of measurement, applying a zero signal to the LN bus, all elements of the meter are reset. Here, the counter 1 and the elements AND 2-4 are set to the zero state. A zero potential is applied to the bus input (Fig. 26). After the termination of the signal. The initial installation at the first inputs of the elements 2-4 is set to a single potential. At the moment -ty of the input to the meter input of the first time interval L of the unit level (Fig. 2b), the unit potentials appear at the outputs of the elements OR 5-7. Since at all inputs of the AND 2 unit is, at its output through time -fc, E "This signal is a single signal, the signal at the second input sets the AND 3 element into one state. The described process of sequential operation of the AND chain of elements will continue until the signal from the inverse output of the last element I sets the element I 2 to the zero state, which entails the sequential establishment of the chain elements to the zero state, etc. The operation of the AND 2-4 chain of elements continues until the end of the measured interval IX ,. In this case, the pulses from the output of element 4 and enter the counter 1. The first counting pulse to the input of counter 1 arrives after the time Tc 2n-hc, where tjo, is the delay time of one element of the chain. At the instant tj of the end of the time interval T, the counter 1 will register the number. In this case, the chain of elements AND 2-4 will remember its state until the next time interval in FIG. 2 at the moment the following state is fixed by the chain: at the output of the element And 2 is one, the elements AND 3-4 are zeros. Element 2 I is held in one state (Fig. 2c) by positive potentials coming in at its inputs from the output of the element OR 5, the bus NU and from the inverse output of the element 4. The value of the measured time interval is determined using the code Ы of the counter 3 of the pulse 1 and the state of the chain of AND 2-4 elements, which contains a small bit of the result. With the arrival of subsequent time intervals T, the first quantizing pulse at the output of the chain appears through time), where n is the number of elements AND in the chain ZyA, the response time of one element AND; tn is the number of elements triggered at the time of the end of the previous interval of the sequence (, 1,2, ...). , if the elements And the chains are set to one; if the items AND chains are set to zero.

Phage. 2,824 l After the termination at time -c of the n-th time interval, counter 1 will fix the number and the string of elements AND 2-4 will contain the value of the least significant bit of the measurement result in a sequential code with inversion. The maximum absolute quantization error l-t will be equal to (-p. Relative quantization error

Claims (1)

DIGITAL TIMER -. NEW INTERVALS, containing η AND elements, the first inputs of which are interconnected, an OR element, the first input of which is connected to the output of the η-th AND element and a pulse counter, characterized in that, in order to increase the reliability of the device and increase the accuracy in measuring the total the duration of the sequence of time intervals, (l -1) OR elements are introduced into it, the output of the j-ro of the AND element, excluding the nth, is connected to the first input of the i-ro of the OR element and to the second input (i + 1) -ro of the AND element , the second input of the first element AND is connected to the inverse output of the l-th And lementa and with counting input of a pulse counter whose reset input is connected to the bus initial installation and the first inputs of AND gates, the third inputs of which are connected to the outputs of the respective OR elements, the second inputs of which are combined and connected to an input bus. Figure 1 Well> 7 II82482