SU932209A1 - Digital strain-gauge meter - Google Patents

Description

(5) DIGITAL SHORT-DOWN

I

The invention relates to a measurement technique used to strain measure various objects in order to determine the effective forces, deformations, weight measurements, and the like.

A device for the automatic weighing of materials is known, which contains strain gauges connected to a comparison circuit to which the outputs of the main and auxiliary auto-compensators fl are also connected.

This device allows to automatically compensate for a variable tare weight; however, it cannot be used if it is necessary to measure it from a conventional reference level of alternating values of the measured value.

The closest to. The technical nature of the proposed is a digital strain gauge containing strain gauges connected to

the following azpr compensator, and the output reading unit 21.

The known device cannot register oscillatory processes with respect to some constant component, usually taken as conditional zero. When balancing strain gauges at a constant component level, this device shows only positive times, and all negatives are zero.

At the same time, in a number of cases in special tests (the study of models in an aerodynamic tube, objects on vibration stands, structures of devices with deformation of nodes of a different polarity, etc.) useful information is carried not only by signals above zero, but and

To signals of the opposite sign.

The purpose of the invention is to obtain alternating counts at any point of the measurement range.

The goal is achieved by introducing a multi-digit reference level adjuster, an output code switch and a combinable adder with a significant bit, with one input of the combiner's adder bits connected to the direct code outputs of the corresponding follower autocompensator bits, the other to the outputs. the return code of the bits of the reference level setting unit, and the output reading unit is bitwise connected with the direct and inverse outputs of the combinational adder via the output code switch, the control inputs of which are connected to the sign bit of the combinational adder.

The drawing shows the block diagram of the proposed digital strain gauge.

The proposed digital strain gauge contains strain gauges 1, a digital tracking autocompensator 2, a combination adder 3. With a sign bit C, an output code switch 5, an output reading unit 6, and a set reference meter 7.

Each bit of the adder 3 is connected to the inputs to the corresponding bits of the following autocompensator 2 (direct code), and the setpoint generator 7 of the conditional reference level (reverse code K and the outputs (right 1m and inverse), these bits are connected via a switch output code 5c output reading block 6. The sign bit indicates the presence in the adder 3 of a positive or negative number and controls the output code switch 5, connecting the output counting block 6 to either forward (positive number) or inverse (negative number outputs su MmaTOR 3, the operation of the strain gauge is as follows.

If zero is specified in the conditional damage reference setter 7, then the output reading unit 6 will display both the constant and dynamic components of the strain gauge signal. To exclude from the reading of the output reading block 6, the constant component in the setpoint generator 7

the reverse code of this component is entered (manually or from the control panel), which, subtracted from the total current readings of the auto-compensator, ensures that only the dynamic component is displayed with the sign of the counted numbers.

The use of a digital system for the operational shift of the reference level (at the level of the constant component, at the level of extreme deviations of the dynamic component, etc.) allows extending the functionality and scope of a strain gauge.

Claims (2)

1. USSR author's certificate ff 250i.86, cl. G 01 G 19/3, 1Eb7. 2. The author's certificate of the USSR Vf 45968, cl. G 01 G 13/28, 1973. BUT fiod  I I Zmon