Unattended automatic test system of quartz crystal oscillator

Abstract

The invention discloses an unattended automatic test system of a quartz crystal oscillator and aims at providing the test system with the safety protection ability and the abilities of self-defining a measurement process, self-setting test parameters and supporting long-time unattended operation. In the test system, a dual-server hot-backup control system is connected with a frequency standard comparator, a multi-channel radio frequency automatic switching device, a digital frequency meter and a multi-channel voltage and current monitoring system through an automatic switchover device of a multi-channel communication bus to form an automatic test loop. The rubidium atomic frequency standard is taken as the benchmark and signals of the tested quartz crystal oscillator are respectively sent to the frequency standard comparator and the digital frequency meter for testing according to the accuracy level thereof by the multi-channel radio frequency automatic switching device under the control of a computer with system control software. The multi-channel voltage and current monitoring system carries out the real-time monitoring of current and voltage states of all the standard devices and the tested devices and receives a command of the dual-server hot-backup control system for turning off or turning on a power supply of any channel.

Description

technical field [0001] The invention relates to an automatic frequency measurement system, and more specifically, the invention relates to a test system for measuring various technical indicators of a quartz crystal oscillator. Background technique [0002] In the prior art, the quartz crystal oscillator is an important reference source for time and frequency measurement equipment, and the current automatic test system for the quartz crystal oscillator usually uses a frequency standard, a frequency standard comparator, a computer and a switch unit for system control composition. Quartz crystal oscillators have many verification items and take a long time. At present, some automatic test systems have appeared in this field, but there are still some problems that lead to the imperfection of the current system. [0003] When the existing quartz crystal oscillator automatic test system is measuring, the output signal of the crystal oscillator to be tested is sent to the input t...

AI Technical Summary

Problems solved by technology

Since the compiled program does not support custom measurement process and self-setting of verification parameters, it has the disadvantages of inflexible verification process and poor practicability

[0007] Secondly, the frequency standard comparator used in the above-mentioned existing quartz crystal oscillator automatic test system cannot be greater than or equal to 1 × 10 -6 indicators of quartz crystal oscillators for automatic testing

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