Debugging Method of High Stability Crystal Oscillator

Abstract

The invention relates to a debugging method of a high-stability crystal oscillator. The crystal oscillator is debugged by using a high-precision frequency measuring device connected by a Beidou satellite navigation receiver, a rubidium atomic clock, a frequency counter and a control computer. The demodulated high-precision 1PPS signal is output to the 1PPS IN port of the rubidium atomic clock through the 1PPS signal port to tame the rubidium atomic clock; the 10MHZ signal output from the 10MHZ output port of the rubidium atomic clock is sent to the external reference signal input port REF IN of the frequency counter, The control computer is connected to the GPIB interface of the frequency counter through the USB GPIB transfer line, and the signal output terminal of the oscillator under test is connected to the frequency counter. This method adopts a high stable frequency reference, which greatly improves the frequency measurement accuracy, and omits the frequency counter every time it is turned on. The warm-up stabilization time of nearly one hour reduces the errors and data omissions caused by manual estimation and recording of data by operators when reading frequently flashing digital tubes, and saves all data records in files.

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. Background technique [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. [0003] E...

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

Images