Automatic test system and method of oscilloscope

Abstract

The invention provides an automatic test system and method of an oscilloscope, and belongs to the technical field of measuring instruments. The automatic test method of an oscilloscope includes the steps: based on a LabVIEW platform, self-manufacturing a set of oscilloscope automatic test software being able to control a digital oscilloscope to automatically set measurement parameters; automatically releasing the acquisition stopping state after single time of triggering, and realizing continuous automatic acquisition of signals; and automatically storing acquired data in a PC, thus solving the problem that the digital oscilloscope is not enough in the storage depth, and realizing long time of measurement and recording of signals in an unattended operation condition; according to a test demand, realizing automatic measurement of the preset test sequence; and according to the change of the signal, automatically adjusting the measurement shift (horizontal time base and vertical shift), and realizing adaptive measurement of unknown signals.

Description

technical field [0001] The invention relates to an oscilloscope automatic test system and method, belonging to the technical field of measuring instruments. Background technique [0002] At the engineering test site, due to the constraints of the site environment, the test often needs to be carried out unattended, such as the railway site test, the tester can only arrange the test equipment at the skylight point, and leave the test site after setting the measurement parameters. In the test process, the amplitude and frequency of the measured signal are often unknown in many cases. When the amplitude and frequency of the signal change, the test equipment needs to automatically adjust the measurement gear to ensure the measurement accuracy. In the project, in order to reduce the measurement error, the signal size should occupy more than 1 / 2 of the measurement range of the measuring equipment; in order to ensure the sampling accuracy, the sampling rate should be greater than tw...

AI Technical Summary

Problems solved by technology

[0004] (1) The portable storage recorder is used for measurement, and the device cannot be programmed to complete the automatic measurement of the preset sequence when unattended; the device does not have adaptive measurement of the sampling rate. When the signal frequency exceeds the sampling bandwidth of the current set sampling rate, the signal Accurate measurement cannot be obtained; in addition, the instrument is expensive, the test cost is high, and the application is limited

[0005] (2) The digital oscilloscope is used for measurement, the storage depth of the digital oscilloscope is limited, and the stored measurement data is constantly refreshed, which cannot meet the test requirements for long-term signal recording; the test parameters cannot be automatically set according to the pre-test set sequence, and automatic measurement cannot be realized; when the signal changes , can not adjust the test parameters according to the signal changes, not self-adaptive

[0008] The storage recorder uses a CF card or SD card to store the collected data, and its size is usually between 2G and 16G, which cannot achieve long-term recording under high-speed sampling

[0009] After setting the range, when the signal exceeds the range, the whole picture of the signal cannot be seen on the monitoring screen, that is, the range screen cannot be changed automatically

[0010] Memory recorders are expensive, a small memory recorder, such as MR8880-21, costs around 80,000 RMB, and large recorders are more expensive, with high testing costs and limited applications

Images