CS224891B1 - Connexion for evaluation of measured quantity levels - Google Patents

Abstract

The invention relates to a circuit arrangement for evaluating the level of a measurement quantity, which is composed of a measuring section, of a level circuit and of comparators. The essence of the invention lies in the fact that an output of the measuring section is connected to the first inputs of the comparators, the outputs of which form the circuit arrangement outputs, whereas the outputs of the level circuit are connected to the second inputs of the comparators. The input of the measuring section and the input of the level circuit are connected to the voltage supply source. <IMAGE>

Description

(54) Switching on to evaluate the levels of the measured quantity

The invention relates to a power supply for high-level measurement, which consists of a measuring element, a level circuit and compilers.

Until now, to assess the levels of the measured quantity you looked at the drill, which required the use of etabilized supply voltages for both the measuring element and the level circuit to ensure the required accuracy. The drawback of these connections is the need for additional equipment to stabilize the supply voltages. The accuracy achieved is then dependent on the type and quality of the stabilizer used.

These drawbacks are eliminated by '^ involvement by finding jehoií characterized in that, IE pгolмí _# ROCEDURES Komppa * rtorů whose outputs are the outputs zapijeztí is connected the output of the measuring element, while the second inputs are connected kompaaátorů outputs from level circuit. The input of the measuring element and the input of the main circuit are connected to a power supply.

One possible practical embodiment of the subject of the invention is shown in the drawing.

It represents an evaluation circuit of the free-of-logic logic for monitoring the fault conditions of the thyristor transducers.

224 891

224 891

Input 11 of measuring elephant 1 is connected to the power supply Ц. Parallel to the input of the measuring room i and theSb Ш ... lim. which are connected to the ig resistors at the other end. Jg ... Ijj. The other ends of the resistors 1g, Xg ... Хд are connected to each other and connected both to the inverting input of the first operational amplifier χχ, whose noninvortional input is grounded and to the other end of the first resistor ϋ. which is also the output Xg of the measuring Si 1 «The output X2 of the measuring Si χ jo is connected in the first points Ц, il ··· Clay of comparators X, £ ... g connected to the invorting inputs of operational amplifiers χ £, 44 ... Jg £, to which are also connected the outputs 2X> 2 ... ... 2fe of the level circuit g via the second inputs 12f. whose non - invasive inputs are grounded are. at the same time outputs of the whole wiring. The input 21 of the level circuit 2, consisting of a non-saw divider, is connected to the terminal U _{M of} the power supply.

A voltage supply U is applied to the input 11 of the measuring cell X. This voltage is processed by the first operational amplifier Ц, whose amplification is given by the ratio of resistance 14 and the parallel combination of resistors χχ, Xg ... Uu is closed. The voltage in the output 1g of the measuring elephant X is thus proportional to the number of press switches closed. ^ 16 ... lln and the supply voltage size 0. The supply voltage U ее also leads to the input 2X of the level circuit 2 · It supplies the voltage divider 5 which produces the required voltage levels for flipping comparators X, ... ... J. Level sizes depend both on the voltage divider setting and on the supply voltage U. If the output voltage from the measuring elephant X exceeds the level at the auxiliary comparators, the comparator realized by the operational amplifier changes its output.

The advantage of the solution according to the invention is, besides the simplicity of wiring, that without the use of a high-quality voltage stabilizer for the measuring elephant and the level circuit, high level 1 accuracy can be achieved with high voltage fluctuations.

Use of the invention is possible in circuits of measuring and control technology, where there is a requirement to evaluate the state of faults in a given row of elements.

Claims (2)

OBJECT OF THE INVENTION Circuit for evaluating the levels of a measurand consisting of a measuring Sien, a level circuit and comparators, characterized by the fact that the first inputs (31, 41 ... kl) of the comparators (3,4 ... k), the outputs (33, 43) of which are used. .. k3) are the outputs of the wiring, the output (12) of the measuring Sien (1) is connected, while the outputs (23, 2 ...) are connected to the second inputs (32, 42 ... k2) of the comparators (3, 4 ... k). 2k) from the level circuit (2), wherein the input (11) of the measuring elephant (1) and the level circuit input (21) (2) They are connected to the power supply terminal (Uj |).