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 be used for data operation and analysis, especially for capturing all the details and abnormal phenomena in complex dynamic signals, so it has been widely used in scientific research and industrial production. In order to make oscilloscope work in a qualified state, it is an urgent task for test engineers to check oscilloscope regularly, quickly and comprehensively and ensure its quantity traceability.
Manual verification efficiency is low, easy to make mistakes, for each kind of oscilloscope verification needs the test engineer to read a lot of data;The automatic test system has the characteristics of measuring parameters accurately and quickly, displaying test results intuitively, and storing test data automatically, which cannot be achieved by traditional manual test.It will be the trend of instrument verification to realize program control verification of oscilloscope with automatic testing system.
GPIB, VXI and PXI are the standard bus of automatic test system. GPIB wins the recognition of users with stable performance, convenient operation and low price.Here GPIB is chosen as the bus of the test system.
The hardware of GPIB based digital oscilloscope automatic verification system consists of GPIB controller tested digital oscilloscope, PC, printer and other peripherals.