SU647643A1 - Time interval meter - Google Patents

Description

The invention relates to the measurement of small time intervals, in particular to multichannel meters operating according to the pulse-counting method, and can be used in radiolocation, experimental physics, in multichannel information and computer complexes, in automation systems, etc. based on the filling of the Aetchik with a pulsed reference frequency and the reading of the meter readings at times corresponding to the measured time intervals, for example, a multichannel device carrying out Measuring a time slot on multiple channels with a single counter, an arithmetic unit and a storage device (memory). However, this device is characterized by relatively low speed and large dimensions. The time interval meter is also known, which contains a counter, connected by its outputs to the inputs of the storage unit, to the other inputs of which the outputs of the address descrambler are connected. This known device does not allow simple switching to change the capacity of the counters of each of the channels when the amount of information in the channel and the number of channels measured changes. The aim of the invention is to expand the functionality of the device and increase its speed. In the device described, this is achieved by introducing a trigger and a series-connected valve and coincidence circuit, the output of which is connected to the input of the address decoder, the overflow output of which, in turn, is connected to the input of the trigger, one output of which is connected to the second input the matching circuits, and the other as well as the output of the valve, serves as the output of the device, with the two inputs of the valve being the inputs of the device. FIG. 1 shows a diagram of the described device for the case of multichannel measurement; in fig. 2 - time diagrams (I-XV). The time interval meter has a counter 1, a storage device 2, a decoder 3 addresses, a gate 4, a coincidence circuit 5 and a trigger 6. In the initial state, the counters 1 in the first and second channels do not work;

the input Me is received counting pulses n does not record information in the storage device 2, since no pulses arrive at the decoder 3 addresses. With the arrival of a pulse "Start at the input of the counter of the first channel, counter 1 counts the pulses of the reference frequency and at the outputs of its bits, a" grid of calibrated frequencies is formed. The “Stop” impulses come through an open valve 4 to one of the inputs of circuit 5 of coincidence, and the other input to circuit 5 is opened with a signal from the direct output of trigger 6.

Thus, the "Stop" pulses come from the output of the circuit 5 to the input of the decoder 3, which selects the address of the storage device 2 at the times corresponding to the arrival of interval pulses (times ti-i, tj-t and ts-i. At these moments time, the code is written into the memory from the outputs of the counter bits 1. In this case, each time interval is assigned a digital equivalent, for example, in a binary code. Thus, time interval ti-i is assigned code 0100, interval t jt is code 1001 and the interval ts-i is the code 1011, etc.

Information is recorded in the first channel memory 2 before it is filled. After that, from the overflow output of the decoder 3, the pulse corresponding to the last variable interval in the riepBOM channel is fed to the input of trigger 6, causing it to trigger and then to the "Start of the second channel, causing the counter 1 in this channel to work. After switching the trigger 6, the circuit 5 is closed, and the signal "Inhibit from the inverse output of the trigger arrives at the input" Stop of the second channel. This opens the valve 4 of the second channel and the interval pulses from the output of the valve 4 of the first channel arrive at the “Input” of the second channel and through the open circuit 5 in the second channel to the decoder 3 of the same channel. There is a measurement of time intervals in the second channel from the moment when the impulse starts, “Start into this fabric” before the arrival of the corresponding interval impulse. This is equivalent to transferring the origin from the time corresponding to diagram I to the time corresponding to diagram IX. Now in the second channel the time intervals are measured in the same way as in the first. Here, the time interval tj.z is assigned the code 0110, the interval - to 1010, and so on.

If we make the corresponding: connections between the second and third measuring channels, then after filling the memory in the second channel, the measurement of time intervals in the third channel starts from the point in time corresponding to the arrival

the last interval pulse on the decoder address of the second channel.

Thus, only by external switching of the meter inputs can one change the amount of information in each measuring cell.

channel.

If it is known that the number of time intervals to be measured in one channel does not exceed the number of addresses of the storage device of this channel, then all measuring channels are independent

and multi-channel time interval measurement can be performed.

Claims (1)

Invention Formula A time meter, containing a counter, connected by its outputs to the inputs of the storage unit, to the other inputs of which are connected the outputs of the address decoder, characterized in that in order to expand the functionality of the device and increase its speed, a trigger and a series-connected gate and coincidence circuit are entered into it, the output of which is connected to the input an address decoder, the overflow output of which, in turn, is connected to the trigger input, one output of which is connected to the second input of the coincidence circuit, and the other, as well as the output of the valve, serves as the output of the device, with two inputs of the valve being the inputs of the device. Start, fla cap s ban  , J} epenami