Method for debugging high-stability crystal oscillator

Abstract

The invention relates to a method for debugging a high-stability crystal oscillator. The method is characterized in that a high-accuracy frequency measuring device formed by connecting a Beidou satellite receiver, a rubydium atomic clock, a frequency counter and a control computer is used for debugging a crystal oscillator; high-accuracy 1PPS signals demodulated by the Beidou satellite receiver are output to a 1PPS IN port of the rubydium atomic clock by virtue of a 1PPS signal port and are used for taming the rubydium atomic clock; 10 MHZ signals output by the 10 MHZ output end of the rubydium atomic clock are transmitted to an external reference signal input port REF IN of the frequency counter; the control computer is connected to a GPIB interface of the frequency counter by virtue of a USB (Universal Serial Bus) GPIB (General Purpose Interface Bus) forwarding wire; the signal output end of the tested oscillator is connected to the frequency counter. By utilizing high-stability frequency reference, the frequency measuring precision is greatly improved; almost an hour of preheating and stabilizing during starting the frequency counter for each time is omitted; the error and data omission caused by artificially estimating and recording data when operators read frequently-flashed digital tubes can be reduced; all the data are recorded in a file for saving.

Description

technical field [0001] The invention relates to the field of production and testing of electronic products, in particular to a debugging method for a high-stability crystal oscillator, which accurately debugs a crystal oscillator in a communication machine, is suitable for precise measurement and calibration of frequency errors of the communication machine, and records adjustment process data, Areas of application for analyzing error trends. technical background [0002] In the scientific research and production of digital communication products, the accuracy of transmitting and receiving frequencies is an important indicator of the communication machine. The accuracy of receiving and transmitting frequencies is determined by the high-stability crystal oscillator in the product. Adjust the oscillator frequency to the specified It is an important task in the research and production of communication machines to ensure the error range and ensure long-term stability. [0...

AI Technical Summary

Problems solved by technology

[0003] Existing problems: In the past, the method of adjusting the oscillator frequency was: connect the frequency output terminal of the tested crystal oscillator to the input interface of the frequency counter, and the operator judges whether the oscillation frequency meets the technical specifications according to the reading of the frequency counter. If it exceeds the error range, then Adjust the crystal oscillator under test to meet the requirements. When it is adjusted to the specified error range, it is necessary to continue to observe the frequency stability. It must be ensured that the reading range of the frequency counter within the specified continuous time cannot exceed the technical index requirements.

This method has the following disadvantages: 1. Whether the frequency counter itself is stable or not can not be determined by the operator during the test, and the frequency counter needs 1 hour of stabilization time after it is turned on

2. During the measurement, the operator has to observe the constantly flashing frequency counter screen for a long time, which is prone to errors due to visual fatigue, and the handwriting cannot keep up with the data jump due to the flashing too fast, so it can only be recorded by estimation

3. The observation of frequency stability can only be observed by the operator for a long time to see if the displayed data is within the range of technical indicators

The trend of the error can only be estimated based on the readings, without data records, which is not convenient for production quality management and subsequent data analysis

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