SU1415219A1 - Device for digital measurement of time intervals - Google Patents

Abstract

The invention relates to a measurement technique and serves to extend the functionality of a meter. The digital meter contains a generator of 1 pulses of the reference frequency, a frequency grid former 2, a counter (C) of 3 orders, a C 5 mantissa and switch 6. The entered shaper 7 of the recording signals, the sensor 8 of the M / oi code. and block 4 of the AND elements allow recording the code, M / txL, where M is the C 5 mantissa recalculation module in the C 5 mantissa synchronously with the C 3 switching order. As a result, at any moment in time, the C 5 mantissa code provides information about the measured interval in the periods of the frequency that fills at the moment. The code for the order of this frequency is stored in the C 3 order. 1 il.

Description

/ f

5 9

(L

ate to

with

 .

The invention relates to a measurement technique and can be used to measure the temporal parameters of pulsed signals.

The purpose of the invention is the expansion of functional capabilities.

On the palace the structural scheme of the digital meter of time intervals is presented.

The device contains a generator of 1 pulses of the reference frequency, a shaper of 2 frequency grids, a 3-order counter, a block of 4 I elements, a counter of 5 mantissa, a switch 6, a shaper of 7 recording signals, a sensor 8 of the M / oi code, an input bus 9, an output bus 10 times and output bus 11 mantissa.

The output of the generator 1 of the reference part is connected to the input of the frequency grid former 2, the outputs of which are connected to the first input group of the switch 6, the second group of inputs of which are connected to the information outputs of the counter 3, the third input of the switch 6 is connected to the input bus 9 of the meter, and the output is connected to the counting input of the counter 5 of the mantissa, whose information outputs are the outputs of the mantissa of the measurement result, and the overflow outflow is connected to the counting input of the counter 3 orders and the input of the filling signal 7 isi, the output of which is connected to the second inputs of the elements AND of the block 4 elements AND, the first inputs of which are connected to the corresponding sensor bits 8 of the M / od code, and the outputs of the elements AND are connected to the inputs of the corresponding bits of the counter 5 mantissa, and the outputs of the order 3 counter are the outputs of the order of the measurement result.

The meter works as follows.

The generator 1 and the former 2 grid frequency form a sequence of reference pulses with frequencies

f, f, / oi ..-, fgM where f, is the frequency of the output signal of the reference generator about - the multiplicity of the frequency change at the output of the driver 2.

I

Until the measurement interval arrives, the counters 3 and 5 are set to the zero state (circuits

Q

Q 5 0

five

0

five

0

Installed not shown, switch f) locked).

When a measured interval arrives at the bus 9, the switch 6 connects to the counting input of the counter 5 a sequence of reference pulses of the highest frequency f ,. In this case, if the measured interval exceeds the overflow time of the counter 5 at the frequency fg, then the counter 5 overflows and the overflow pulse is recorded in the counter 3 times. In addition, the overflow pulse of the counter 5 is fed to the input of the imager 7 of the recording signal.

The imaging unit 7, block 4 and sensor 8 of the code allow the recording of the M / Oo code, where M is the counter 5 recalculation module, into counter 5 synchronously with the switching of counter 3.

Changing the code at the outputs of the counter 3 and, respectively, at the control inputs of the switch 6 leads to the counter input of the counter 5 of the reference sequence with a frequency synchronous with the counter 5 overflow pulse, writing the M / oi code from the sensor output 8 of the code to the counter 5 and changing the reference frequencies from f, to fj / Dt is equivalent to filling the counter 5 from the beginning of the measured interval with pulses of frequency f3 / bi (i.e., during the arrival time of pulses And pulses with frequency fg, M / oi pulses of frequency arrive).

The further counting of counter 5 continues from the M / ivi code.

After each overflow of the counter 5, the content of the counter 3 is increased by one, the frequency at the output of the switch 6 is reduced by oi times, and the code M / o is entered into the counter 5.

Switching the counter 3 times occurs due to the overflow of the counter of the mantissa and leads to a decrease in the output frequency of the switch by oi times. As a result, after each overflow of the counter of the mantissa, its filling starts with a frequency that is ui times less than the previous one, but not from zero, but from the M / oi code ,.

This is equivalent to filling the mantissa counter from the beginning of the measurement with a frequency oi times reduced, where n is the code contained in the order counter and equal to the number of overflows of the mantissa counter.

3k 152

As a result, in nrnfioii, the instant of time, the code of a mantnc counter is the information about the measured interval in the periods of the frequency that is filling the moment. The order code for this frequency is stored in the order 3 counter. The value of the measured interval is determined from the dependence

  Ai f,

Nnop On,

Where

t is the measured time interval, fj is the frequency of the reference generator

-fold frequency variation

- code in the counter 5,

-code in the counter 3.

Claims (1)

Invention Formula A digital time interval meter containing a reference frequency pulse generator, a frequency grid driver, a switch, a mantissa counter, and an order counter, the counting input of which is connected to the mantissa counter overflow output, in0 five five (The outputs of which are connected to the first group are the digital sensor 1 meter, and the counter input of the mantissa counter is connected to the switch output, the first group of inputs to which is connected to the outputs of the grid; the frequency grid, the input connected to the output pulse of the reference frequency generator , the input bus of the meter is connected to the first input of the switch, about D i and DI and - with the fact that, in order to expand the functionality, it additionally introduced a write signal generator, a block of elements And the sensor code, The outputs of which are connected to the first inputs of the corresponding And elements, the outputs of which are connected to the information inputs of the mantissa counter, the second inputs of the And elements, are combined and connected to the overflow output of the mantissa counter via the recording signal conditioner, and the information outputs of the counter are connected to the second group of inputs of the switch The second group of meter outputs.