With the development of electronic technology, digital oscilloscope with the digital technology and software greatly expanded the ability to work, the early products of low sampling rate, there is a big dead zone time, less than be improved screen refresh rate low, difficult to observe before modulation signal, communication eye diagram, such as composite video signal is more and more easy to observe. Digital oscilloscope can calculate and analyze data, which is especially suitable for capturing all details and abnormal phenomena in complex dynamic signal.In order to make the oscilloscope work in a qualified state, it is an urgent task for the test engineer to verify the oscilloscope regularly, quickly and comprehensively and to ensure the traceability of its value.
Manual verification is inefficient and prone to errors. The verification of each oscilloscope requires the test engineer to read a lot of data.The automatic test system has the characteristics of accurately and quickly measuring parameters, intuitively displaying test results, automatically storing test data and so on.It will be the trend of instrument verification to realize program control verification of oscilloscope with automatic test system.
GPIB, VXI and PXI are the standard buses of automatic test system. GPIB has won the recognition of users for its stable performance, convenient operation and low price.Here, GPIB is selected as the bus of the test system.
The hardware of automatic verification system of digital oscilloscope based on GPIB is composed of GPIB controller, FLUKE5500A, verified digital oscilloscope, PC and printer