SU429260A1 - DIGITAL TENSOR METER - Google Patents

Description

one

The invention relates to a measurement technique, namely a device for digital strain gauge instruments.

Digital strain gauges are known that contain an electric bridge with a strain gauge in one of the arms and a device for digital measurement of the unbalance of the bridge with controlled conductivity that shuns one of the bridge arms. These devices are widely used, however, the lack of automatic input into the measurement result of the correction for the deviation of the strain sensitivity of the respondent strain gauge from its nominal value does not allow achieving high accuracy of measurements.

In order to improve the measurement accuracy, the instrument is equipped with several chains, each of which consists of two series-connected resistors and is connected in parallel to the diagonal of the bridge power, keys connected between the middle points of these chains, and the top of the output diagonal of the bridge connected to the controlled conductivity and the register connected with keys.

The drawing shows a diagram of the proposed device.

The digital strain gauge device contains an electric bridge formed by a strain gauge 1 and resistors 2, 3 and 4, a power source of bridge 5 included in the measuring diagonal of the bridge, a zero-body 6, controlled conductivity formed by the discharge resistors 7 and the discharge switches 8, triggers 9 registers 10 used to control the keys 8; resistor chains, each of which consists of two series-connected resistors 11

and 12, keys 13, connected between the middle points of these chains and the top of the output diagonal of the bridge, controlled by the triggers 14 of the register 15. The device works as follows.

The work cycle begins with sending in the register 15 codes of the number corresponding to the coefficient of the gage sensitivity of the strain gauge 1, included in the bridge arm. In this case, the resistors 11 and 12 of those bits in which the unit is written are connected via switches 13 in parallel to resistors 2 and 3, respectively.

Next, the bridge equilibration is performed using the register 10, keys 8 and resistors 7. The measurement result is recorded in the digital measurement device - in the triggers 9 of the register 10. Circuits within the trigger resistors 11 and 12, the keys 13 controlled by the triggers 14, and registers

15, provides automatic consideration of the strain sensitivity of the strain gauge used.

Subject invention

A digital strain gauge device containing an electric bridge with a teismistor in one of the arms and a digital device for measuring the unbalance of a bridge with controlled conductivity that shunt one of the bridge arms, characterized in that it is equipped with several chains, each consists of two series-connected resistors and is connected in parallel to the diagonal of the power bridge, the keys connected between the middle points of these chains, and the vertex of the output diagonal of the bridge connected to ravl emoy conductivity and register connected to the keys.