Control circuit for weighing sensor

Abstract

The invention provides a control circuit for a weighing sensor. The circuit comprises analog switches. Each analog switch connects a connector and a signal processing device for controlling a connection relationship between signal lines of the connector and the signal processing device. A control module controls a connection relationship between the signal lines of each connector and each signal processing device which are connected by the analog switch. The control module is controlled by the staff with buttons or menu options. The structure is simple; the cost is low; and the operation is convenient.

Description

technical field [0001] The invention relates to a weighing sensor control circuit, and mainly relates to a four-wire and six-wire control structure of the output interface of the weighing sensor. Background technique [0002] Load cells are generally divided into four-wire system and six-wire system according to the wiring method. These two wiring methods have their own advantages and disadvantages: in the four-wire connection method, such as figure 1 As shown in a, the weighing sensor has no special requirements for the instrument, and it is more convenient to use, but when the cable is long, it is easily affected by the interference caused by factors such as ambient temperature fluctuations, thereby affecting the measurement performance of the electronic weighing instrument; the six-wire system In connection, such as figure 1 As shown in b, the weighing sensor requires the instrument used with it to have a feedback input interface, such as feedback (+) and feedback (-), ...

AI Technical Summary

Problems solved by technology

These two wiring methods have their own advantages and disadvantages: in the four-wire connection method, such as figure 1 As shown in a, the weighing sensor has no special requirements for the instrument, and it is more convenient to use, but when the cable is long, it is easily affected by the interference caused by factors such as ambient temperature fluctuations, thereby affecting the measurement performance of the electronic weighing instrument; the six-wire system In connection, such as figure 1 As shown in b, the weighing sensor requires the instrument used with it to have a feedback input interface, such as feedback (+) and feedback (-), the scope of use has certain limitations, but it is not easy to be affected by factors such as ambient temperature fluctuations It has certain advantages in precision measurement and long-distance measurement

However, the conversion of this scheme can only be carried out at the same time when the load cell is installed, once the setting between R1, R2 and 0 ohm resistance is completed, it cannot be changed

Moreover, this solution only involves how the six-wire sensor realizes the four-wire system, and does not involve how the four-wire sensor realizes the six-wire system, so as to connect six-wire external devices

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