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RTC clock calibration method and industrial field calibration device

A clock calibration and industrial site technology, applied to clocks, electronic timers, and time indications, etc., can solve complex changes in the on-site working environment, increase calibration costs and complexity, and are not suitable for external standard clocks and on-site instrument calibration Problems such as carrying the device with you

Active Publication Date: 2021-09-14
BEIJING CONST INSTR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The higher the crystal oscillator frequency of the RTC module, the greater the power consumption. The industrial field calibration device is limited by its application characteristics, and the RTC module itself does not use a particularly high-frequency crystal oscillator signal.
The industrial on-site calibration device using a low-frequency crystal oscillator, once the frequency offset of the lower-frequency crystal oscillator occurs, the actual timing accuracy may be affected. Calibrating it with an external crystal oscillator as an external standard clock will increase the calibration cost and calibration complexity;
[0007] 2) The on-site working environment changes complexly. The same on-site instrument calibration device may be used in different environments in a short period of time, or the same on-site working environment may undergo large changes in temperature and humidity in a short period of time, or , there are many strong interference factors in the harsh on-site working environment, or there is a large deviation between the on-site working environment and the calibration environment
The above problems will cause the RTC of the industrial field instrument calibration device to be calibrated frequently. However, the existing technology is not suitable for carrying the external standard clock and the field instrument calibration device.
[0008] 3) Perform RTC clock calibration through the time obtained by GPS or relying on the time of the server. When the GPS signal is poor or the client cannot establish a connection with the server, the client is offline and cannot complete the RTC clock calibration

Method used

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  • RTC clock calibration method and industrial field calibration device
  • RTC clock calibration method and industrial field calibration device
  • RTC clock calibration method and industrial field calibration device

Examples

Experimental program
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Effect test

Embodiment 1

[0055] In this embodiment, a pressure (instrument) calibrating device used for calibrating or calibrating a pressure instrument in an industrial field is taken as an example to illustrate the RTC clock calibration process of the calibrating device in an industrial field. figure 1 The basic composition of a typical pressure calibration device is shown: the pressure calibration device includes an MCU main board 1, a pressure acquisition module 2, an electrical signal measurement module 3 and a battery module 4, and the pressure acquisition module and the electrical signal measurement module 3 are respectively connected to the MCU main board 1 is electrically connected, and the battery module 4 is electrically connected to the MCU main board 1 for supplying power to each module.

[0056] Wherein, MCU motherboard 1 is provided with processing unit (i.e. CPU) 11, high frequency crystal oscillator (hereinafter referred to as HSE) 12 and low frequency crystal oscillator (LSE) 13, is p...

Embodiment 2

[0074] In this embodiment, a process (instrument) verification device for verifying or calibrating a process instrument in an industrial field is taken as an example to illustrate the RTC clock calibration process of the industrial field verification device. figure 2 The basic composition of a typical process verification device is shown: the process verification device includes an MCU main board 1, an electrical signal measurement module 3 and a battery module 4, further, the electrical signal measurement module 3 includes a current measurement unit 31, a voltage measurement unit 32, The resistance measurement unit 33 and the temperature measurement unit 34, the temperature measurement unit 34 includes a temperature sensor, which can measure the ambient temperature of the electrical signal measurement module 3 as the cold junction temperature when the thermocouple process signal is calibrated.

[0075] The difference from the pressure calibration device in Embodiment 1 is tha...

Embodiment 3

[0085] In this embodiment, a temperature (instrument) verification device used for verifying or calibrating a temperature instrument in an industrial field is taken as an example to illustrate the RTC clock calibration process of the industrial field verification device. image 3 The basic composition of a typical temperature calibration device is shown: in this embodiment, the temperature calibration device includes an MCU main board 1 and a temperature acquisition module 5 electrically connected to the MCU main board 1, wherein:

[0086] MCU motherboard 1 includes a processing unit (CPU) 11 and a clock module formed by high-frequency crystal oscillator (HSE) 12 and low-frequency crystal oscillator (LSE) 13, HSE is used as the system clock signal source of MCU motherboard 1, and also as a high-frequency calibration of LSE Clock signal, preferably, when HSE is used as a high-frequency calibration signal of LSE, frequency multiplication technology is used to increase its frequen...

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PUM

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Abstract

The invention provides an RTC clock calibration method and an industrial field calibration device. According to the method, the cycle number of a reference clock or the cycle number of the reference clock subjected to frequency multiplication through a PLL circuit is collected through a set first timer, the cycle number of a work clock is collected through a set second timer, and the second timer and the first timer are enabled to synchronously start counting and synchronously end counting within preset time, thereby realizing RTC clock calibration of low-frequency crystal oscillator as working clock. According to the method, a high-frequency crystal oscillator of the device as a reference clock is used for calibrating a low-frequency crystal oscillator of the device as a working clock, thus the RTC calibration can be automatically executed by the calibration device, the calibration cost is saved, the dependence of the RTC calibration on the online client device is reduced, and the calibration device is suitable for the industrial field calibration device.

Description

technical field [0001] The invention relates to calibration technology in the field of industrial instruments and meters, in particular to an RTC clock calibration method and an industrial field calibration device. Background technique [0002] The real-time clock RTC (abbreviation of Real-time Clock) has technical advantages such as low power consumption and independent power supply. It is widely used in industrial field instrument calibration devices, such as pressure (instrument) calibrator, temperature (humidity) degree ( Instrument) calibrator, process (instrument) calibrator, etc., so as to realize the long-term work of the instrument calibration device in the industrial field environment, and is easy to carry. [0003] Based on the special requirements of the measurement and calibration industry, in order to ensure the accuracy of measurement data, the meter calibration device needs to have high and reliable timing accuracy. Therefore, the RTC of the field meter calib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04G5/00
CPCG04G5/00
Inventor 刘畅梁洪飞
Owner BEIJING CONST INSTR TECH INC
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