CS237257B1 - Digital string device for summary measuring - Google Patents

Abstract

The invention relates to a digital string summation measurement equipment, of which the essence is that it is made up of electronic switch (14) to whose inputs string oscillators (1) are connected and to the output of which it is connected a control counter (8) and a controlled gun (15) connected via a reversible counter (9) with memory (10) with display. Electronic switch (14) and reversible counter (9J are controlled by the control unit (11)). The device according to the invention is suitable for tensometric scales, string level meters and for string applications to date methods.

Description

(54)

Digital stringing equipment for total measurements

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital string measuring device comprising: an electronic switch (14) to which inputs are connected the oscillators (1) of the string sensors and to the output of which a control counter (8) and a controlled divider (15) interconnected via a reversible counter (9) with a memory (10) with displays. The electronic switch (14) and the reversible counter (9J) are controlled by the control unit (11), and the device according to the invention is suitable for strain gauges, string level gauges, and for previous string measuring method applications.

257 257 Int. Clý

G 06 i 5/05

-1 237 257

The invention relates to a digital string measuring device for summation measurements, wherein the value to be evaluated is the sum or difference of a plurality with the same sensitivity of the measured quantities and the registration of partial results is of no practical significance.

The known string apparatus solutions required for the control of quantities such as the moment of forces, the pressure difference, the difference between the active and compensating strain gauges and the like, require the registration of all partial results and obtain the desired result by additional calculation. This solution is particularly disadvantageous with visual reading devices such as weighing. This drawback has so far prevented the use of the advantageous properties of the string measuring method in a number of areas.

The disadvantages of the prior art solutions are eliminated by the solution according to the invention, which consists in that it consists of an electronic switch, string sensor oscillators, a linearization period meter and a control unit. The string switch oscillators are connected to the inputs of the electronic switch and a period counter is connected to the first output of the electronic switch. The blocking input of the electronic switch is connected to the control unit and the second output of the electronic switch is connected to the control unit, the output of which is connected to a period length meter.

According to a feature of the invention, the electronic switch comprises a multiplexer whose output is connected to a first monostable circuit, to a divider, and further via a capacitor to an input of a bistable flip-flop whose output is connected to a zero input of the divider and to a second output of the electronic switch. Stop input

237 257

- O is a flip-flop together with a counter input connected to the output oonostabilního second circuit whose inputs are connected to outputs of the first monostable circuit, the divider and the control input of the electronic switch whose first output is connected to the counter, which is further connected to a mux ₀

The main advantage of the solution according to the invention is that it eliminates the main disadvantage of the string measurement method over the resistance method almost without the need for manufacturing costs, which leads to a substantial extension of the application range of the string measurement method. The wiring is universal for any combination of wired inputs and the external control only requires a sign selection.

The device according to the invention is shown schematically in the attached drawing.

The digital string measuring device for summation measurements consists of an electronic switch 14, which consists of a multiplexer 2, to which inputs the oscillators 1 of the string emitters are connected. The first monostable circuit 5, the divider 6 and the bistable flip-flop 7 input are connected to the multiplexer 6, the output of which is connected to the divider zero input 6 and longer to the controlled divider 13 and the control counter 8 of the linearization period meter 15. . The stop input of the bistable flip-flop 7 together with the input of the counter 3 is connected to the output of the second monostable circuit 4, the inputs of which are connected to the outputs of the first mopostable circuit 2 of the divider 6 and the control unit 11 which is connected to the counter 3 and longer to the reversible counter 9 The counter 3 is further connected to the multiplexer 2. The controlled divider 13 and the clock 12 are connected to the control counter 8 and its output is connected to the input of the control counter 8 and to the input of the reversible counter 9 which is connected to the memory 10 with the display.

• Outputs from the string sensor oscillators 1 are fed to the input of the electronic switch 14, which forms the multiplexesc 2.

In multiplexer 2, only one of the connected signals is passed through the logic product according to the state of the counter 6, which is applied in the form of a rectangular signal to the first monostable circuit 5, which keeps it in an unstable state, longer to the divider 6

Which, when reading the selected number of periods, energizes the output of the second monostable circuit 4 at the input of the counter 5 and at the input of the bistable flip-flop 7 which is started via capacitive coupling. Thus, the filling of the divider 6 or the absence of the corresponding input signal on the multiplexer 2 causes, via counter 5, automatic switching of the multiplexer 2 input and via bistable flip-flop 7 resetting divider 6 and control counter 8 clocks from clocks 12 linearly sorted by controlled divider 15 The control unit 11, after subtracting all the inputs of the multiplexer 2, allows to divide the divider 6 and the controlled divider 15 and the control counter 8 and the reversible counter 9 in the reset state through the second monostable circuit 4 until the start command at the input. In the case of an output reversible counter 9, the readout is written to the display memory 10 before resetting.

The device according to the invention is particularly suitable for strain gauges, string level gauges and all previous string measuring method applications.

Claims (2)

SUBJECT OF THE INVENTION 237 257 1. A digital string measuring device for summation, characterized in that it consists of an electronic switch (14), oscillators (1) of string sensors, a linear length meter (15) and a control unit (A), wherein the inputs of the electronic switch A4 are oscillators A (string pickups) are connected to the first output of the electronic switch A4 / connected to the control counter / 8 / meter A5 / period length, while the blocking input of the electronic switch A4 / is connected to the control unit A1 / to a control unit (11) whose output is connected to a period length meter (15). Digital stringing device according to claim 1, characterized in that the electronic switch (14) consists of a multiplexer (2), the output of which is connected to a first monostable circuit (5), to a divider (6) and further via a capacitor to a bistable flip circuit (1), the output of which is connected to the reset input of the divider (6) and to the first output of the electronic switch A4, while the stop output of the bistable flip-flop (7) is connected to the output of the second monostable circuit (4). the inputs of which are connected to the outputs of the first monostable circuit (5), the divider (6) and the blocking input of the electronic switch A4 /, the second output of which is connected to a counter A / whose outputs are connected to the multiplexer /.