A meter calibration method based on bluetooth communication

Abstract

The present invention provides a method for calibrating a meter based on Bluetooth communication. The method includes: acquiring a deviation value D; and correcting a pulse signal R0 of the meter based on the deviation value D. The meter calibration method can perform high-precision, low-error and standardized transmission of the meter calibration pulse signal; digitally sample the pulse signal, and the transmission guarantee mechanism that comes with the BLE protocol avoids data loss caused by wireless interference in the air to the test system ;Data compression of pulse data can greatly reduce the amount of transmitted data, give time for data retransmission, and avoid data delay caused by interference during transmission; low requirements for Bluetooth chips, only support BLE with basic functions The chip can complete the meter calibration function without additional data transmission channels, which can increase the user's choice of chips and reduce product costs.

Description

technical field [0001] The invention belongs to the technical field of water meters, electric meters, gas meters and heat meters, and in particular relates to a meter calibration method based on bluetooth communication. Background technique [0002] In the fields of water meters, electricity meters, gas meters, and heat meters (hereinafter referred to as four meters), the existing meter calibration scheme is usually: the meter to be tested continuously inputs a standard current such as 10 amperes, and the meter continuously outputs a standard high and low current through a wire. The pulse signal is then transmitted optically or wirelessly, and then the duty cycle and frequency of this pulse signal are obtained on the metering side through a corresponding optical or wireless method. [0003] Since most hydrometers that support wireless meter reading are equipped with a Bluetooth Low Energy (BLE) chip, and the BLE chip communicates based on a 2.4G frequency point. Therefore, ...

AI Technical Summary

Problems solved by technology

But in fact, whether the chip of the meter or testing equipment to be tested uses an off-chip crystal oscillator or an on-chip RC circuit as a clock source, there will be a problem of accuracy or error in its main frequency.

According to the accuracy of the clock source (for example, the accuracy is 10ppm), it can be determined that the meter to be tested and the testing device are used as the sender and receiver within one second, and the main frequency of the two may cause an error of up to 20 microseconds, which is important for meter calibration. program is not acceptable

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