SU393694A1 - - Google Patents

Description

TACHOMETRIC ELECTRONIC INSTALLATION

one

The invention relates to a measurement technique and is intended for measuring the speed of a tachometer sensor.

Known tachometric attachments to the electronic frequency meter, containing an oscillation sensor connected to a shaping device, two frequency dividers, AND logic and a frequency meter.

Known tachometric shooters and low-speed performance.

The proposed tachometer prefix for the purpose (speeding up is provided with two generators, the frequencies of which are related to one another as whole numbers, the outputs of the generators are connected to the corresponding inputs of the first and second frequency dividers via the "And" directly, and the second input of the second circuit “And with the same forming device — through the circuit“ NOT, the like divisors of the frequency dividers are connected via the equivalence nodes to the input of the output circuit “And the output to It is connected via a reset circuit to the bits of the second frequency divider and To the input of the frequency meter.

The drawing shows a block diagram of a tachometer set-top box.

The block diagram of the tachometer console consists of a forming device 1, divide the FREQUENCY METER

Lei 2, 3 frequencies, two circuits “And 4, 5, circuits“ NOT 6, 1 generators 7, 8, nodes 9 of equivalence, output circuit “And 10, circuits / V reset and divider 12 frequencies.

The tacho prefix works as follows.

The pulses of arbitrary shape from the tachometer of the combi sensor are applied to the input shaping device /, which produces a strobe pulse — a rectangular shape with a duration equal to the duration of the inlet period | Prior to this, a three-span dividers 2 and 3 frequencies are set to zero. In the case of post-strobe pulse, the “AND 4” circuit opens and the “AND 5” circuit is closed through the “NOT 6” circuit.

Short pulses (generator 7 through the circuit "And 4 arrive at frequency divider 9. The number of pulses received during the time Tx. Is equal to

A f, rBx .--,

/ in

where / 1 is the frequency of the generator 7;

/ ° x - frequency of input pulses;

. - duration of the input period

pulses; Tr. - strobe pulse duration. At the end of the post-strobe, the gate-impulse closes the circuit "AND 4 and the circuit opens" AND 5, through which the pulses of the generator 8 are switched on to the divider 2 frequencies and the walking pulse is fed to the input of the frequency meter. With the arrival of a pulse (N is the number of pulses recorded in divider 5), the same triggers of dividers 2 and 3 will be in the same state, and at the outputs of each of the nodes 9 of the equivalence, a signal goes through the And 10 circuit and the reset circuit. It will act as a counting impulse at the output of the set-top box and simultaneously set zero divider triggers to 2 frequencies. The pulse frequency at the set-top box output is LL 2g Jt f lg - /, generator frequency 8. When selecting the frequency ratio of 1 generator L 6-10, an indication of the frequency meter readings in rpm is provided. A hard frequency ratio is achieved by introducing an additional divider connected to the output of the generator 5 and to the "AND 4" circuit. In this case, the need for generator 7 is eliminated. This somewhat increases the volume of the circuit, however, increases its functionality, i.e., expands the input frequency range and improves the measurement accuracy, since generator 8 can operate in a wide frequency range and its frequency is set so that frequency divider 3 fills up to volume, close to maximum, which will ensure the minimum error of the discrete transformation. The subject of the invention is a tachometer attachment to an electronic frequency meter, comprising an oscillation sensor connected to a shaping device, two frequency dividers, an AND logic and a frequency counter characterized in that, in order to increase the speed of the superstructure, the attachment is equipped with two generators, the frequencies of which are related to the other as integers, the outputs of the generators are connected through the "And" circuits to the corresponding inputs of the first and second frequency dividers, the second input of the first "And" circuit is connected to the shaping device directly, Torah input of the second circuit "and the same forming ustroystvo1M - through the circuit" NOT same name bits frequency dividers through nodes equivalence ladklyucheny to the input output circuit "And, the output of which is connected through a reset circuit to the bits of the second frequency divider and frequency counter input.