Meter calibration method based on Bluetooth communication

Abstract

The invention provides a meter calibration method based on Bluetooth communication. The method comprises the following steps: acquiring a deviation value D; and correcting the pulse signal R0 of the meter based on the deviation value D. The meter calibration method can perform high-precision and low-error standardized transmission on the meter calibration pulse signal; digital sampling is carriedout on pulse signals, and data loss of a test system caused by air wireless interference is avoided through a transmission guarantee mechanism of a BLE protocol. Data compression is performed on the pulse data, so that the transmitted data volume can be greatly reduced, spare time is provided for data retransmission, and data delay caused by interference in the transmission process is avoided; therequirement for the Bluetooth chip is low, the meter calibration function can be completed only through the BLE chip supporting the basic function, an extra data transmission channel is not needed, the selectable range of the user chip can be widened, and the product cost is reduced.

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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